• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a white light emitting LED module (1), comprising at least a first LED chip (2) and at least one second LED chip (3), a cover (4), which all LED chips (2, 3 ) and at least two different phosphors (5, 6) is provided, wherein at least one phosphor (5, 6) is adapted to at least partially convert radiation of the first LED chip (2) into a first light, at least one other phosphor (5, 6) is adapted to at least partially convert radiation of the second LED chip (3) into a second light, the white light of the LED module (1) contains at least the first and the second light, and color coordinates of the white light by changing the intensity and / or wavelength of the radiation of the first and / or second LED chip (2, 3) are variable.
    公开号:AT16494U1
    申请号:TGM393/2015U
    申请日:2015-12-22
    公开日:2019-10-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    The present invention relates to a white light emitting LED module. In particular, the present invention relates to such an LED module, which is variable with respect to the color coordinates of the white light emitted by it.
    It is known from the prior art to mix white light of an LED module from the light of a red, a green and a blue LED. It also phosphors or phosphor mixtures are used - and. applied to one or more of the LEDs or to areas of LEDs - to produce warmer or colder white light. In addition, depending on the strength of the driving of the individual LEDs, a color temperature or a hue of the white light of the known LED module can be changed.
    A disadvantage of this white light emitting LED module is that it is complicated and expensive to apply the phosphors or phosphor mixtures precisely on the LEDs or on the areas of the LEDs. In addition, a reduction of the light emitting surface for this LED module is limited possible. In addition, the color temperature of the LED module can be changed only in a relatively narrow range and only in discrete steps. It is also disadvantageous that the blue and red LEDs have a different temperature dependence, whereby the color tone of the LED module is not stable during operation.
    It is also known from the prior art to mix white light of an LED module from the light of a cold white LED and a warm white LED. Each of the LEDs is provided with a cover, in particular with a globe top over the LED. One globe top contains a phosphor for producing the cool white light and the other globe top contains a phosphor for producing the warm white light. To set the color temperature or a color point of the white light of the LED module, the two LEDs are controlled by a driver with two output stages.
    A disadvantage of this white light emitting LED module is that the radiated light is relatively inhomogeneous and homogeneity can be ensured only with the help of a diffuser or the like.
    Starting from the known LED modules and their disadvantages, it is an object of the present invention to produce an improved white light radiating LED module. In particular, a color point and the color temperature of the white light in a range of 2000-6500 K should be infinitely adjustable. The introduction of phosphor in the LED module should also be simplified. In addition, the scalability of the LED module towards smaller sizes, especially light emitting surfaces should be easier to achieve. Another goal is better color mixing for a more homogeneous white light of the LED module. In particular, no diffusers are required, which bring a loss of efficiency of the LED module with it.
    The above objects are achieved by the present invention according to the independent claim. In this case, the invention provides a single cover over an LED chip arrangement of at least two LED chips, wherein the cover has at least two different phosphors.
    In particular, the present invention relates to a white light emitting LED module, comprising at least a first LED chip and at least a second LED chip, a cover which covers all the LED chips and is provided with at least two different phosphors, wherein at least one phosphor to is suitable to at least partially convert radiation of the first LED chip into a first light, at least one other phosphor is adapted to at least partially convert radiation of the second LED chip into a second light, the white light of the LED module at least the first and the
    1.25
    And color coordinates of the white light are variable by adjusting the intensity and / or wavelength of the radiation of the first and / or second LED chip.
    Characterized in that only a single cover is used, which is preferably a homogeneous phosphor layer over or phosphor coating around all LED chips, a more homogeneous white light can be achieved due to better color mixing. In particular, no diffuser or the like is necessary for this purpose. The only cover used in the LED module also makes it much easier to introduce the different phosphors. In particular, the various phosphors do not have to be arranged at specific areas, but can be uniformly distributed, embedded in the cover as a phosphor mixture, or applied to them.
    By adjusting the intensity and / or wavelength of the radiation of at least one LED chip with the present invention, the color point - eg. In the CIE diagram or each color temperature of the white light between 2000-6500 K adjustable. In order to adjust or increase or shift the intensity and / or wavelength of an LED chip, this LED chip can be selectively driven either continuously or pulsed.
    Advantageously, the cover is a globe top, preferably a globe top dispensed over all the LEDchips, or the cover is a filling of an LED module made by damming and filling.
    Such over all LED chips dispensed globe top, which has the at least two different phosphors, is easy to manufacture and to arrange on or over very small Lichtabstrahlflächen. As a result, a reduction of the LED module or Lichtabstrahlflächen is easier. The various phosphors can advantageously be distributed in the material of the globe top, before it is dispensed over the LED chips. Alternatively or additionally, phosphor layers can also be applied to the globe top. The same advantages can also be achieved for an LED module that is produced by dam and fill. In this case, one or more dams are first prepared, preferably an all LED chips enclosing annular dam is made, and then filled as a filling with the preferably distributed therein phosphors between the or the dams.
    Advantageously, the intensity of the radiation of the first and / or second LED chip is variable by amplitude or pulse width modulation, and / or the wavelength range of the radiation of the first and / or second LED chip via the forward current is variable.
    The selective control of the LED chips with an AM or PWM signal or the selective control by changing the forward current is targeted and possible at any time during operation of the LED module. Thus, the color point in the CIE diagram or the color temperature of the white light can be varied steplessly at least between 2000-6500 K.
    Advantageously, an excitation spectrum of one phosphor does not overlap with an emission spectrum of the other phosphor.
    This allows a separate excitation of the different phosphors are made possible. This can be achieved for example by targeted gaps in the excitation spectrum of one or both phosphors. At least one phosphor is advantageously not or only slightly excitable by the radiation of one of the at least two LED chips.
    Advantageously, for a first embodiment of the first LED chip is adapted to emit blue light, the second LED chip suitable to emit UV radiation or violet light, a first phosphor suitable for the blue light of the first LED chip and / or at least partially converting the UV radiation or the violet light of the second LED chip into green, greenish-yellow, yellowish-green and / or yellow first light, and a second phosphor suitable for absorbing the UV radiation or the violet light of the second LED2 / 25
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    At least partially convert the chips or blue light of the first LED chip into red second light.
    The white light emitting LED module thus contains at least one green, greenish yellow, yellowish-green and / or yellow luminous phosphor and a red glowing phosphor. This allows a pleasantly warm color temperature of the adjustable white light can be achieved.
    Advantageously, the first phosphor is adapted to only partially convert the blue light of the first LED chip and / or the violet light of the second LED chip into the first light, such that a mixture of the unconverted light and the first light gives a white light, wherein the white light of the LED module contains at least the white light consisting of the unconverted light and the first light and the second light.
    The color point or the color temperature of the white light of the LED module can now be changed in particular by selectively controlling either only continuously or for example in the manner of a PWM modulation only the second or the first LED chip. As a result, the intensity and / or wavelength of the radiation emitted by the second or first LED chip and thus the proportion of the red second light can be adjusted or changed, as a result of which the color point or the color temperature of the white light of the LED module changes.
    Advantageously, the cover is provided with a third phosphor, wherein the third phosphor is suitable, the blue light of the first LED chip and / or the UV radiation or the violet light of the second LED chip at least partially in green, greenish yellow, yellowish green and / or yellow third light, and the white light of the LED module contains the third light.
    Preferably, the third phosphor comprises a rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE
    [0023] Under BOSE is meant orthosilicates of the formulas (Ca, Sr, Ba) 2 SiO 4: Eu 2+, (Ca, Sr,) 2SiO4: Eu 2+, Ba2SiO 4: Eu 2+, Sr2SiO4: Eu 2+ , (Sr, Ba) 2SiO 4 : Eu 2+ or (Ca, Ba) 2 SiO 4 : Eu 2+ .
    By the additional third phosphor, the color temperature of the white light can be further improved. In particular, the color rendering index of the light of the LED module is improved when both the blue light of the first LED chip and the UV radiation or the violet light of the second LED chip excite a phosphor which is green, greenish-yellow, yellowish-green and / or gives off yellow light. In other words, if the light or the radiation from both LED chips is at least partially converted to green, greenish-yellow, yellowish-green and / or yellow light. This can be realized by a broadband stimulable phosphor or by two different, differently excitable phosphors. Furthermore, the adjustability of the color point or the color temperature between 2000-6500 K is further simplified.
    At least two phosphors, for example, the first or second phosphor and the third phosphor can be advantageously realized by a single phosphor. This means that it is possible to use a special phosphor which can be excited, for example, both by blue light and by violet light or UV radiation. This reduces the complexity of the system and is possible for example by a targeted doping of a known YAG phosphor with a rare earth such as Ce 3+ .
    Advantageously, for a first variant of the first embodiment of the first LED chip is suitable to emit blue light with an intensity maximum in a wavelength range of 455-475 nm, and the second LED chip is suitable to violet light with an intensity maximum in one Wavelength range of 380 - 410 nm, preferably at a wavelength of about 405 nm emit.
    3.25
    Such a LED module has the advantage that the individual LED chips are available simply and cheaply. In particular, the first and second LED chips may be GaN-based LED chips. Furthermore, suitable phosphors for implementing the present invention are also readily available for such LED chips.
    Advantageously, the first phosphor comprises a garnet doped with rare earths, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE ((Ca, Sr, Ba) 2 SiO 4 : Eu 2+, (Ca, Sr,) 2SiO4: Eu 2+, Ba2SiO 4: Eu 2+, Sr2SiO4: Eu 2+, (Sr, Ba) 2 SiO 4: Eu 2+), (Ca, Ba) 2 SiO 4 : Eu 2+ )), and the second phosphor comprises a manganese-doped KSF or a rare-earth-doped nitride.
    In this case, the first phosphor can at least partially convert the light of the purple LED chip and the second phosphor convert the light of the blue LED chip. For example, an orthosilicate, such as by one of the formula (Ca, Sr, Ba) 2 SiO 4: Eu 2+, (Ca, Sr,) 2SiO4: Eu 2+, Ba2SiO 4: Eu 2+, Sr2SiO4: Eu 2+, (Sr, Ba) 2SiO 4 : Eu 2+ ), (Ca, Ba) 2SiO 4: Eu 2+ ) being used as the first phosphor which can be excited by the violet light of the second LED chip, can already be recognized by the violet LED Chip and the first fluorescent a white light are generated. The red light of the second phosphor, which can be excited by the blue light of the first LED chip, then serves to shift the color point or the color temperature of the white light of the LED module into the warmer and adjust the color temperature. For example, for the second phosphor K2 (SiF 6 ): Mn 4+ or (Sr, Ca) AISiN 3: Eu 2+ or CaAlSiN 3: Eu 2+ may be used.
    Advantageously, for a second variant of the first embodiment, the first LED chip is adapted to emit blue light having an intensity maximum in a wavelength range of 455-475 nm, and the second LED chip is adapted to UV radiation to emit an intensity maximum in a wavelength range of 230-280 nm.
    For example, a blue GaN LED chip and an ultraviolet AIGaN LED chip are used for this LED module. The emission wavelength of the AIGaN LED chip is preferably adjustable by changing the forward current between 230-280 nm.
    Advantageously, the cover is provided with at least one UV-absorbing substance, preferably with TiO 2 and / or Al 2 O 3 .
    The UV absorber is used to filter unconverted UV radiation, which may be undesirable to the human eye.
    Advantageously, the first phosphor comprises a rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE (eg (Ba, Sr) 2SiO 4: Eu 2+ ), and the second phosphor comprises a rare earth doped garnet, preferably YAG: Eu 3+ , or a rare earth doped yttrium oxide, preferably Y 2 O 3 : Eu 3+ .
    In this case, the first phosphor can convert the light of the blue LED chip and the second phosphor can convert the light of the UV LED chip. For example, as the first phosphor, a YAG: Ce 3+ can be used which exhibits no or only little excitation at a wavelength of 230-280 nm (ie is excited by the blue LED chip, as it were). As a second phosphor can then Y2O3: Eu 3+ used, which shows no or little excitation at a wavelength of 455-475 nm (that is quasi excited only by the UV LED chip). The majority of the white light of the LED module is then due to the first light, ie the blue light of the first LED chip and the green or yellow light of the YAG: Ce 3+ , while a color shift to the reddish emitted by the light from the Y2O 3 : Eu 3+ is achieved. Depending on the control of the individual LED chips, such a light overlay can be changed in order to set a color point or a color temperature of the white light of the LED module.
    Advantageously, for a second embodiment, the first and the second LED4 / 25
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    Chip adapted to emit UV radiation, wherein a first phosphor and a second phosphor together are at least partially convert the UV radiation of the first and second LED chips, so that a mixture of the first and the second light gives a white light.
    Advantageously, the first LED chip is suitable for emitting UV radiation with an intensity maximum in a wavelength range of 320-360 nm, and the second LED chip is suitable for UV radiation having an intensity maximum in a wavelength range of 230-280 nm.
    Advantageously, the first phosphor comprises a rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE, and the second phosphor comprises a rare earth doped one Yttrium oxide, preferably Y 2 O 3 : Eu 3+ .
    Advantageously, the LED module further comprises at least a third LED chip, which is adapted to emit blue light, wherein the white light of the LED module, at least the white light consisting of the first and the second light and the blue Contains light from the third LED chip.
    The additional blue LED chip is used such that the blue light emitted by it is substantially not converted and therefore contributes to the white light of the LED module. The third LED chip can in turn be controlled individually, whereby the change in the color point or the color temperature of the white light of the LED module is even more variable.
    Advantageously, for a third embodiment, the first and the second LED chip are adapted to emit blue light, wherein the first phosphor is adapted to only partially convert the blue light of the first LED chip, so that a mixture of gives the unconverted blue light of the first LED chip and the first light a warmer white light, wherein the second phosphor is adapted to only partially convert the blue light of the second LED chip, such that a mixture of the unconverted blue light the second LED chip and the second light gives a colder white light, and wherein the white light of the LED module contains at least the warmer and the colder white light.
    By selective control of the warmer white light-producing LED chip or the colder white light-producing LED chips, the color point or the color temperature of the white light of the LED module can be adjusted.
    Advantageously, the first LED chip is adapted to emit blue light having an intensity maximum in a wavelength range of 400-440 nm, and the second LED chip is adapted to blue light having an intensity maximum in a wavelength range of 430-470 nm. Such blue LED chips are available simply and cheaply. It is also beneficial that no UV light is emitted.
    The present invention will now be described in detail with reference to the accompanying drawings.
    FIG. 2 shows an LED module according to the present invention. [0045] FIG.
    shows a LED module with two phosphors in a globe top according to the present invention.
    shows a LED module with three phosphors in a globe top according to the present invention.
    Figure 4 shows a manufactured by dam and fill LED module according to the present invention.
    FIG. 5 shows an excitation and emission spectrum of a first YAG phosphor.
    5/25
    FIG. 6 FIG. 8 FIG. 8 FIG. 9 FIG. 10 [0054] FIG. 11 [0056] FIG. 12 [0057] FIG. 13 [0058 ] Figure 14 shows an excitation and emission spectrum of a second YAG phosphor.
    shows an excitation and emission spectrum of a B.O.S.E. phosphor.
    shows an excitation and emission spectrum of a B.O.S.E. phosphor.
    shows an excitation and emission spectrum of orthosilicate phosphor.
    shows an excitation and emission spectrum of a KSF phosphor.
    shows an excitation and emission spectrum of a rare earth-doped nitride phosphor.
    shows an excitation and emission spectrum of a rare earth doped YEO phosphor (yttrium oxide).
    shows an excitation and emission spectrum of a third YAG phosphor. shows an excitation and emission spectrum of a LUAG phosphor.
    An inventive white light emitting LED module 1 is shown in Fig. 1. The LED module 1 has at least one first LED chip 2 and has at least one second LED chip 3. By way of example, four first LED chips 2 and four second LED chips 3 are shown. The at least one first LED chip 2 emits radiation of a first wavelength or of a first wavelength range during operation of the LED module 1, while the at least one second LED chip 3 radiation of a second wavelength or a second wavelength range emits.
    The first LED chip 2 is, for example, a blue LED chip emitting blue light in a range of preferably 455-475 nm. The second LED chip 3 is, for example, a violet LED chip which emits violet light in a range of preferably 380-410 nm, or is a UV LED chip which emits UV radiation in a range of preferably 230-280 nm ,
    The LED module 1 further comprises a cover 4 which covers at least a first and a second LED chip 2, 3, preferably all LED chips 2, 3. In Fig. 1, the cover 4 is exemplified as a globe top over all the LED chips 2, 3. In this case, the cover 4 is preferably a globe top dispensed over all the LED chips 2, 3.
    The cover 4 is at least provided with a first phosphor 5 and a second phosphor 6 (for example, offset, mixed or coated), the cover 4 thus has at least two different phosphors 5, 6. The cover 4 is preferably provided homogeneously with the two phosphors 5, 6, in particular homogeneously over all LED chips 2, 3 or their emission angle. At least one of the phosphors 5, 6 is suitable for at least partially converting radiation of the first LED chip 2 into a first light, and at least one other phosphor 5, 6 is suitable for converting radiation of the second LED chip 3 at least partially into a second light.
    A first phosphor 5 is for example suitable for converting the light emitted by the first LED chip 2 and / or the second LED chip 3 at least partially into first light of a third wavelength or of a third wavelength range. The phosphor can also completely convert the light emitted by the LED chip 2, 3 into the first light. For this purpose, the first phosphor 5 is preferably a phosphor which emits in the green, greenish-yellow, yellowish-green and / or yellow wavelength range (ie approximately between approximately 510-580 nm) upon excitation.
    A second phosphor 6 is suitable, for example, to at least partially convert the radiation or light emitted by the second LED chip 3 and / or by the first LED chip 2 into second light of a fourth wavelength or of a fourth wavelength range , The second phosphor 6 can also completely convert the light or radiation emitted by the LED chip 3, 2 into the second light. Preferably, the second light is 6/25
    AT16494U1 2019-10-15 c Austrianiictiei palpriar.i
    Substance 6 is a phosphor which emits light in the red wavelength range upon excitation.
    The total of the LED module 1 emitted light then contains at least the first light, which is emitted from the first phosphor 5, and the second light, which is emitted from the second phosphor 6. This will produce a warm white light. If the phosphors 5, 6 either either or at least one of them does not completely convert the excitation light, then the radiation emitted by the first LED chip 2 or that from the second LED chip 3 also mixes with the white light of the LED module 1 emitted radiation.
    FIG. 1 shows connections to the LED chips 2, 3 with which the LED chips 2, 3 can be driven either individually or jointly. In particular, the LED module 1 is provided with corresponding means for driving the LEDs 2, 3 - either individually or all together - by amplitude modulation (AM modulation) or by pulse width modulation (PWM modulation), or a forward current to change the LED chips 2, 3. This makes it possible to change the intensity of the radiation of the individual LED chips 2, 3 or a wavelength of the radiation (or a wavelength range) of the individual LED chips 2, 3 in a targeted manner. Through this targeted change, the color coordinates of the LED module 1, in particular the color point in a color diagram such as CIE diagram and / or the color temperature of the white light of the LED module 1, can be adjusted continuously in a range of at least 2000-6500 K. 2, the individual LED chips 2, 3 are arranged on a base plate 7, for example a FR 4 PCB.
    FIG. 2 shows a similar white light emitting LED module 1 as shown in FIG. In particular, two different phosphors 5 and 6 are shown in the cover 4, which in turn is shown in Fig. 2 as a globe top.
    The first phosphor 5 may comprise rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate such as BOSE. The second phosphor 6 may be a manganese doped KSF, or a rare earth doped nitride, or a rare earth doped garnet preferably YAG: Eu 3+ , or a rare earth doped yttrium oxide, preferably Y 2 O 3 : Eu Include 3+ . Specific phosphors or advantageous phosphor combinations are shown later in the application.
    Fig. 3 shows a similar LED module 1, as shown in Figure 2. In Fig. 3, in addition to the first phosphor 5 and the second phosphor 6, a third phosphor 8 in the cover 4 is present, which in turn is shown as a globe top. This third phosphor 8 is, for example, a rare-earth-doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare-earth-doped orthosilicate, preferably BOSE, and is excited by the light of the first LED chip 2 or by the light or UV radiation of the second LED chip 3 preferably green, greenish-yellow, yellowish-green and / or yellow light.
    FIG. 4 shows a similar LED module 1, as shown in FIG. However, the cover 4 is now formed as a filling of an LED module 1 produced by insulation and filling. The thus formed LED module 1 has at least one dam 8, preferably as shown, an annular dam 8, which includes the individual LED chips 2, 3 in its interior. Between the dam 8, the filling with the different phosphors 5, 6, 8 distributed therein is introduced via all the LED chips 2, 3. It can also be seen in FIG. 4 that the individual LED chips 2, 3 are connected in series by means of, for example, bonding wires, by means of connections routed outside the dam 8.
    The base plate 7 is preferably an Alanod plate, or other highly reflective plate 7, in order to reflect the light of the individual LED chips 2, 3 or light backscattered by the phosphors 5, 6, 8, to the light output of the LED module 1 to increase. Such a highly reflective plate 7 is also possible for all shown LED modules 1 with globe top as cover 4.
    7.25
    In the following, examples of the abovementioned embodiments with particularly advantageous combinations of LED chips and phosphors will now be described.
    A first, second and third example of the first variant of the first embodiment comprises in each case at least one blue LED chip 2, which has an intensity maximum in a wavelength range of 455-475 nm, and at least one violet LED chip 3, the has an intensity maximum in a wavelength range of 380-410 nm.
    In the first example, a phosphor mixture is introduced into the cover 4, which consists of a B.O.S.E. phosphor (or alternatively an orthosilicate), a first type of YAG phosphor and KSF. The B.O.S.E. phosphor is capable of converting the light of the violet LED chip 3 into greenish-yellow light. All phosphors are further adapted to convert the light of the blue LED chip 2. In particular, the YAG emits a yellow light, the B.O.S.E. phosphor emits a greenish-yellow light and the KSF emits a red light.
    The excitation and emission spectrum of the YAG phosphor used (Y 3 Al 5 O 12 : Ce 3+ ) is shown in FIG. 5. Alternatively to the YAG phosphor, a LuAG phosphor (such as LuAG: Ce 3+ ) whose excitation and emission spectrum is shown in FIG. 14 may be used. Stimulation and emission spectra of useful BOSE phosphors (BaSrSiO4: Eu 2+, Ba2SiO 4: Eu 2+, and Sr2SiO4: Eu 2+ shown in Figs 7-9, the excitation and emission spectrum of the KSF used (K2 (SiF 6).. Mn 4+ ) is shown in FIG.
    In the second example, a phosphor mixture of a second type of YAG phosphor and KSF is introduced into the cover 4. The YAG is adapted to convert the light of the violet LED chip 3, especially in yellowish-green light. Both phosphors are further adapted to convert the light of the blue LED chip 3. In particular, the YAG emits a yellow light, the KSF emits a red light.
    The excitation and emission spectrum of the YAG phosphor used (Y 3 Al 5 0i 2 : Ce 3+ ) is shown in Fig. 6, the excitation and emission spectrum of the used KSF (K 2 (SiF 6 ): Mn 4 + ) in Fig. 10.
    In the third example, a phosphor mixture of a BOSE phosphor (alternatively, an orthosilicate), a first type of YAG phosphor and a nitride (eg, (Sr, Ca) AISiN 3 : Eu 2+ , CaAISiN 3 : Eu 2 + ) is introduced into the cover 4. The BOSE phosphor and the nitride are adapted to convert the light of the purple LED chip 3. The BOSE-phosphor emits especially greenish yellow light, the nitride red light. All three phosphors are adapted to convert the light of the blue LED chip 2. The BOSE phosphor emits greenish-yellow light, the nitride red light and the YAG yellow light.
    The excitation and emission spectrum of the YAG phosphor used (Y 3 Al 5 O 12 : Ce 3+ ) is shown in Fig. 5, the excitation and emission spectrum of usable BOSE phosphors (BaSrSiO 4: Eu 2+ , Ba 2 SiO 4 : Eu 2+ and Sr 2 SiO 4: Eu 2+ ) in FIGS. 7-8 and the excitation and emission spectrum of the nitride (Sr, Ca) AISiN 3: Eu 2+ ) used in FIG. 11. Alternatively, instead of the YAG phosphor, a LuAG phosphor (about LuAG: Ce 3+ ) whose excitation and emission spectrum is shown in FIG.
    A first and second example of the second variant of the first embodiment comprises a blue LED chip 2 having an intensity maximum in a wavelength range of 455-475 nm, and a UV LED chip 3 having an intensity maximum in a wavelength range of 230-280 nm.
    In the first example, a phosphor mixture is introduced into the cover 4, which consists of a second type of YAG phosphor and a YEO phosphor (as an alternative to the YEO phosphor of a third type of YAG phosphor (YAG: Eu 3+ ) consists). Both phosphors are suitable for converting the radiation of the UV LED chip 3, in particular the YAG phosphor of the second kind (FIG. 6) into yellow light and the YEO phosphor in red light. Only the second type of YAG phosphor is also suitable for the light of the blue LED8 / 25
    AT16494U1 2019-10-15 c Austrianiictiei pater taird
    To convert chips 2, again in yellow light.
    The absorption and emission spectrum of the YAG phosphor (Y 3 Al 5 0i 2 : Ce 3+ ) is shown in Fig. 6, the absorption and emission spectrum of the YEO phosphor (Y 2 O 3: Eu 3+ ) is shown in FIG 12. The emission and absorption spectrum of the alternative YAG phosphor of the third kind (Y3Al 5 O 2 : Eu 3+ ), which is alternative to the YEO phosphor, is shown in FIG. 13.
    In the second example, a phosphor mixture of a B.O.S.E. phosphor, a YEO phosphor (alternatively again a YAG phosphor of the third kind) and a first type of YAG phosphor is introduced. The B.O.S.E. phosphor and the YEO phosphor (or YAG third type) are capable of converting the radiation of the UV LED chip 3. In particular, the B.O.S.E. phosphor emits greenish-yellow light and the YEO-phosphor (or the YAG of the third type) emits red light. The YAG phosphor of the first kind and the B.O.S.E.Leuchtstoff are also adapted to convert the light of the blue LED chip 2. In particular, the YAG emits yellow light and the B.O.S.E. phosphor emits greenish-yellow light.
    The absorption and emission spectrum of the YAG phosphor of the first kind (Y 3 Al 5 O 12 : Ce 3+ ) is shown in FIG. 5, the absorption and emission spectrum of the YEO phosphor (Y 2 O 3 : Eu 3+ ) is shown in FIG 12. The emission and absorption spectrum of the YEO alternative YAG phosphor of the third kind (Y3Al 5 O 12 : Eu 3+ ) is shown in FIG. Excitation and emission spectra of usable BOSE phosphors (BaSrSiO4: Eu 2+, Sr2SiO 4: Eu 2+ and Ba 2 SiO 4: Eu 2+) are shown in Fig. 7-9.
    An example of the second embodiment includes a first UV LED chip 2 having an intensity maximum at a wavelength of 320-360 nm, and a second UV LED chip 3 having an intensity maximum in a wavelength range of 230-280 nm having. As the phosphor mixture, a YAG phosphor and a YEO phosphor are used. The YAG (YAG: Ce 3+ , Fig. 5 or 6) is particularly suitable for converting the light of the first UV LED chip 2, in particular in yellow light. The YEO (Y 2 O 3 : Eu 3+ , FIG. 12) is adapted to convert the light of the second UV LED chip 3, in particular in red light.
    An example of the third embodiment includes a blue LED chip 2 emitting blue light with an intensity maximum in a wavelength range of 400-440 nm, and a second blue LED chip 3 containing blue light with an intensity maximum in a wavelength range emitted from 430-470 nm. The phosphor mixture used is preferably a YAG mixture, in which case, for example, a first and second type of YAG phosphor (YAG: Ce 3+ , FIGS. 5 and 6) can be mixed. The YAG phosphors are suitable for converting the light of the blue LED chips 2, 3, in particular into yellow, so that accordingly warmer white light and once colder white light are produced. As a result, a white light emitting LED module 1 with a variable color temperature is achieved overall.
    Overall, it is advantageous for the invention that at least partially a separated excitation of different types of phosphor is made possible, which is realized in that the excitation and emission spectrum of the different phosphors do not overlap. This can be achieved by specific gaps in the excitation spectrum.
    Overall, a white light emitting LED module 1 is realized by the present invention, which can be made easier because in particular the different phosphors can be easily attached. In addition, the production of the LED module 1 is simplified and better accessible to smaller structure sizes by mixing the different phosphors in a single cover 4, for example a single GlobeTop. Furthermore, the homogeneity of the white light is also improved. By specifically controlling the individual LED chips 2, 3 used by, for example, an AM or PWM modulation or setting the forward current, the color point or the color temperature can be set steplessly between 2000-6500 K for the LED module 1 of the present invention ,
    权利要求:
    Claims (10)
    [1]
    1. White light emitting LED module (1), comprising at least a first LED chip (2) and at least one second LED chip (3), a cover (4) covering all the LED chips (2, 3) and at least two different phosphors (5, 6) is provided, wherein at least one phosphor (5, 6) is adapted to at least partially convert radiation of the first LED chip (2) into a first light, at least one other phosphor (5 , 6) is adapted to at least partially convert radiation of the second LED chip (3) into a second light, the white light of the LED module (1) contains at least the first and the second light, and
    Color coordinates of the white light by adjusting the intensity and / or wavelength of the radiation of the first and / or second LED chip (2, 3) are variable.
    [2]
    2. LED module (1) according to claim 1, wherein the cover (4) is a globe top, preferably a over all LED chips (2, 3) dispensed globe top, or the cover (4) a filling of a by insulating-and-filling produced LED module (1).
    [3]
    3. LED module (1) according to any one of claims 1 and 2, wherein the intensity of the radiation of the first and / or second LED chip (2, 3) is variable by amplitude or pulse width modulation, and / or the wavelength the radiation of the first and / or second LED chip (2, 3) via the forward current is variable.
    [4]
    4. LED module (1) according to one of claims 1 to 3, wherein a maximum in the excitation spectrum of the one phosphor (5, 6) does not overlap with a maximum in the emission spectrum of the other phosphor (6, 5).
    [5]
    5. LED module (1) according to one of claims 1 to 4, wherein the first LED chip (2) is adapted to emit blue light, the second LED chip (3) is adapted to UV radiation or violet light a first phosphor (5) is suitable, the blue light of the first LED chip (2) and / or the UV radiation or the violet light of the second LED chip (3) at least partially in green, greenish-yellow, yellowish-green and / or yellow first light, and a second phosphor (6) is adapted to the UV radiation or the violet light of the second LED chip (3) and / or the blue light of the first LED chip (2 ) at least partially convert to red second light.
    [6]
    6. LED module (1) according to claim 5, wherein the first phosphor (5) is adapted to the blue light of the first LED chip (2) and / or the violet light of the second LED chip (3) only partially to convert into the first light so that a mixture of the unconverted light and the first light gives a white light, and the white light of the LED module (1) at least the white light consisting of the unconverted light and the first light and the contains second light.
    10/25
    AT16494U1 2019-10-15 c Austrianiictiei pater taird
    [7]
    7. LED module (1) according to any one of claims 5 or 6, wherein the cover (4) is provided with a third phosphor (8), the third phosphor (8) is adapted to the blue light of the first LED chip (2) and / or at least partially convert the UV radiation or the violet light of the second LED chip (3) into green, greenish-yellow, yellowish-green and / or yellow third light, and to emit the white light of the LED module (1 ) contains the third light.
    [8]
    8. LED module (1) according to claim 7, wherein the third phosphor (8) is a rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE , includes.
    [9]
    9. LED module (1) according to one of claims 5 to 8, wherein the first LED chip (2) is adapted to emit blue light with an intensity maximum in a wavelength range of 455-475 nm, and the second LED chip (3) is capable of emitting violet light having an intensity maximum in a wavelength range of 380-410 nm, preferably at a wavelength of about 405 nm.
    [10]
    10. LED module (1) according to claim 9, wherein the first phosphor (5) is a rare earth doped garnet, preferably YAG: Ce 3+ , or LuAG: Ce 3+ , or a rare earth doped orthosilicate, preferably BOSE , and the second phosphor (6) comprises a manganese doped KSF or a rare earth doped nitride.
    For this 14 sheets of drawings
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE202015105686.9U|DE202015105686U1|2015-10-26|2015-10-26|White light emitting LED module|
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