CN101453804B - white light emitting device - Google Patents
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- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
Description
Translated fromChinese技术领域technical field
本发明是有关一种发光装置，尤其是一种白光发光装置，该白光发光装置的发光亮度及发光效率可大幅提升。The invention relates to a light-emitting device, especially a white light-emitting device. The luminous brightness and luminous efficiency of the white-light light-emitting device can be greatly improved.
背景技术Background technique
白光发光二极管(white LED)是所有发光二极管技术中难度最高的一种。白光发光二极管的制作有两个关键点：第一点是必须有高效率的发光二极管芯片；以及第二点则是必须有可以搭配的高效率荧光粉。全球白光发光二极管的主要厂商是日亚化学(Nichia)，该公司即在会发出波长为460nm的蓝光的芯片上涂布一层钇铝石榴石(YAG)荧光物质，利用蓝光发光二极管芯片照射此荧光物质以产生与蓝光互补的波长为555nm的黄光，再利用透镜原理，将互补的黄色光、蓝色光加以混合，最后制造出白色。但由蓝光与钇铝石榴石荧光粉所搭配的发光二极管会发出具有色斑及月晕等现象的白光。因此，如何提升发光强度，以消弭白光中出现的色斑及月晕等现象，同时提升发光效率则为本发明所要钻研的主要课题。White light-emitting diode (white LED) is the most difficult of all light-emitting diode technologies. There are two key points in the production of white light-emitting diodes: the first point is that there must be high-efficiency light-emitting diode chips; and the second point is that there must be high-efficiency phosphors that can be matched. The main manufacturer of white light-emitting diodes in the world is Nichia, which coats a layer of yttrium aluminum garnet (YAG) fluorescent substance on a chip that emits blue light with a wavelength of 460nm, and uses the blue light-emitting diode chip to irradiate the blue light. The fluorescent substance produces yellow light with a wavelength of 555nm that is complementary to the blue light, and then uses the lens principle to mix the complementary yellow light and blue light to finally produce white. However, the light-emitting diodes with blue light and yttrium aluminum garnet phosphor will emit white light with color spots and moon halos. Therefore, how to increase the luminous intensity to eliminate the phenomenon of color spots and moon halos in white light, and at the same time improve the luminous efficiency is the main subject to be studied by the present invention.
发明内容Contents of the invention
因此，本发明的目的是提供一种白光发光装置，该白光发光装置能发出具有高发光强度与高发光效率的白光，以解决上述已知技术上的课题。Therefore, the object of the present invention is to provide a white light emitting device capable of emitting white light with high luminous intensity and high luminous efficiency, so as to solve the above-mentioned problems in the known technology.
为了达到上述目的，本发明提供一种白光发光装置，其包括：发光组件，具有发光层，该发光层是由氮化物系化合物半导体所组成的，且可发出波长介于320至410nm之间的第一光；以及荧光层，位于该发光组件上，以吸收该发光组件所发出的该第一光的至少一部份，而该荧光层包括：荧光增白剂，是有机化合物，该荧光增白剂吸收该第一光的一部份，并发出波长介于450至600nm之间的第二光；和光致发光荧光体，包括选自Y、La、Gd与Sm所组成的组群中的至少一种元素和选自Al、Ga与In所组成的组群中的至少一种元素，且由铈致活的石榴石系(garnet)荧光体，而该光致发光荧光体可吸收该第一光的一部份与该第二光的一部份，并发出波长介于530nm至590nm之间的第三光。In order to achieve the above object, the present invention provides a white light-emitting device, which includes: a light-emitting component with a light-emitting layer, the light-emitting layer is composed of nitride-based compound semiconductors, and can emit light with a wavelength between 320 and 410nm. the first light; and a fluorescent layer located on the light-emitting component to absorb at least a part of the first light emitted by the light-emitting component, and the fluorescent layer includes: a fluorescent whitening agent, which is an organic compound, and the fluorescent whitening agent is an organic compound. a white agent absorbs a part of the first light, and emits a second light having a wavelength between 450 and 600 nm; and a photoluminescent phosphor including a phosphor selected from the group consisting of Y, La, Gd, and Sm At least one element and at least one element selected from the group consisting of Al, Ga, and In, a garnet phosphor activated by cerium, and the photoluminescent phosphor can absorb the first a part of the first light and a part of the second light, and emit a third light with a wavelength between 530nm and 590nm.
本发明又提供一种白光发光装置，包括：发光组件，该发光组件具有发光层，该发光层是由氮化物系化合物半导体所组成的，且可发出波长介于320至410nm之间的第一光；以及封装层，包覆该发光组件，该封装层中包含有：荧光增白剂，是有机化合物，该荧光增白剂可吸收该第一光的一部份，并发出波长介于450至600nm之间的第二光；和光致发光荧光体，包括选自Y、La、Gd与Sm所组成的组群中的至少一种元素和选自Al、Ga与In所组成的组群中的至少一种元素，且由铈致活的石榴石系荧光体，而该光致发光荧光体可吸收该第一光的一部份与该第二光的一部份，并发出波长介于530nm至590nm之间的第三光，其中，该第一光、该第二光与该第三光在该封装层中进行混合后，从该封装层向外发射出白光。The present invention further provides a white light emitting device, including: a light emitting component, the light emitting component has a light emitting layer, the light emitting layer is composed of a nitride compound semiconductor, and can emit first light with a wavelength between 320 and 410 nm. light; and an encapsulation layer covering the light-emitting component, the encapsulation layer contains: a fluorescent whitening agent, which is an organic compound, and the fluorescent whitening agent can absorb part of the first light and emit a wavelength between 450 to the second light between 600nm; and a photoluminescent phosphor comprising at least one element selected from the group consisting of Y, La, Gd and Sm and an element selected from the group consisting of Al, Ga and In At least one element of the garnet-based phosphor activated by cerium, and the photoluminescent phosphor can absorb a part of the first light and a part of the second light, and emit a wavelength between The third light between 530nm and 590nm, wherein, after the first light, the second light and the third light are mixed in the encapsulation layer, white light is emitted from the encapsulation layer.
本发明的优点是：本发明可使用不易产生热的高效率紫外光光源代替蓝光光源，而且与已知白光发光装置相比，本发明使用荧光增白剂，不但可使已知使用蓝光光源与YAG荧光粉的白光发光装置的发光亮度大幅提升，并且可消弭已知白光发光装置中出现的色斑及月晕等现象，同时本发明白光发光装置的发光效率也获得大幅提升。The advantage of the present invention is: the present invention can use the high-efficiency ultraviolet light source that is not easy to generate heat to replace the blue light source, and compared with the known white light emitting device, the present invention uses the fluorescent whitening agent, not only can make known use blue light source and The luminous brightness of the white light emitting device of the YAG phosphor is greatly improved, and the phenomenon of color spots and moon halos in the known white light emitting device can be eliminated, and at the same time, the luminous efficiency of the white light emitting device of the present invention is also greatly improved.
由本发明下述的实施方式及所附图，本发明的前述及其它目的、特征、观点及优点将会更加清楚。The aforementioned and other objects, features, viewpoints and advantages of the present invention will be more clearly understood from the following embodiments of the present invention and the accompanying drawings.
附图说明Description of drawings
图1是根据本发明的实施例的荧光强度对波长(300nm至400nm)的光谱，其中荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示；1 is a spectrum of fluorescence intensity versus wavelength (300nm to 400nm) according to an embodiment of the present invention, wherein the phosphor-resin mixture is represented by a solid line -, and the YAG-resin mixture is represented by a dotted line...;
图2是根据本发明的实施例的发光效率对波长(300nm至400nm)的光谱，其中荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物系以虚线...表示；2 is a spectrum of luminous efficiency versus wavelength (300nm to 400nm) according to an embodiment of the present invention, wherein the phosphor-resin mixture is represented by the solid line -, and the YAG-resin mixture is represented by the dotted line ...;
图3是根据本发明的实施例的荧光强度对波长(350nm至395nm)的光谱，其中荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示；3 is a spectrum of fluorescence intensity versus wavelength (350nm to 395nm) according to an embodiment of the present invention, wherein the phosphor-resin mixture is represented by a solid line -, and the YAG-resin mixture is represented by a dotted line...;
图4是根据本发明的实施例的发光效率对波长(350nm至395nm)的光谱，其中荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示；以及4 is a spectrum of luminous efficiency versus wavelength (350nm to 395nm) according to an embodiment of the present invention, wherein the phosphor-resin mixture is represented by the solid line -, and the YAG-resin mixture is represented by the dotted line ...; and
图5是根据本发明的实施例的发光亮度(LM)对波长(350nm至395nm)的光谱，其中荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示。5 is a spectrum of luminance (LM) versus wavelength (350nm to 395nm) according to an embodiment of the present invention, wherein the phosphor-resin mixture is represented by the solid line -, and the YAG-resin mixture is represented by the dotted line... .
具体实施方式Detailed ways
下面将以更加详细的方式描述本发明的优选实施例。Preferred embodiments of the present invention will be described in more detail below.
在一种实施例中，本发明的白光发光装置，包括：发光组件，具有发光层，该发光层是由氮化物系化合物半导体(例如InGaN)所组成的，且可发出波长介于320至410nm之间的第一光；以及荧光层，位于该发光组件上，以吸收该发光组件所发出的该第一光的至少一部份，而该荧光层包括：荧光增白剂，其是4，4-双(2-甲氧基苯乙烯基)联苯，而该荧光增白剂可吸收该第一光的一部份，并发出波长介于450至600nm之间的第二光；和光致发光荧光体，包括选自Y、La、Gd与Sm所组成的组群中的至少一种元素和选自Al、Ga与In所组成组的群中的至少一种元素，且由铈致活的石榴石系荧光体，而该光致发光荧光体的化学式为(Y1-p-q-rGdpCeqSmr)3(Al1-sGas)5O12，其中0≤p≤0.8、0.003≤q≤0.2、0.0003≤r≤0.08和0≤s≤1，且该光致发光荧光体可吸收该第一光的一部份与该第二光的一部份，并发出波长介于530nm至590nm之间的第三光。In one embodiment, the white light-emitting device of the present invention includes: a light-emitting component having a light-emitting layer, the light-emitting layer is composed of a nitride-based compound semiconductor (such as InGaN), and can emit light with a wavelength between 320 and 410nm the first light in between; and a fluorescent layer located on the light-emitting component to absorb at least a part of the first light emitted by the light-emitting component, and the fluorescent layer includes: a fluorescent whitening agent, which is 4, 4-bis(2-methoxystyryl)biphenyl, and the optical brightener absorbs a portion of the first light and emits a second light having a wavelength between 450 and 600 nm; and photoinduced A luminescent phosphor comprising at least one element selected from the group consisting of Y, La, Gd, and Sm and at least one element selected from the group consisting of Al, Ga, and In, and activated by cerium garnet-based phosphor, and the chemical formula of the photoluminescent phosphor is (Y1-pqr Gdp Ceq Smr )3 (Al1-s Gas )5 O12 , where 0≤p≤0.8, 0.003 ≤q≤0.2, 0.0003≤r≤0.08 and 0≤s≤1, and the photoluminescent phosphor can absorb a part of the first light and a part of the second light, and emit a wavelength between 530nm to a third light between 590nm.
该白光发光装置，更包括由树脂构成的封装层，包覆该发光组件及该荧光层，而该第一光、该第二光与该第三光在该封装层中进行混合后，会从该封装层向外发射出白光。The white light emitting device further includes an encapsulation layer made of resin to cover the light-emitting component and the fluorescent layer, and after the first light, the second light and the third light are mixed in the encapsulation layer, the The encapsulation layer emits white light outward.
在另一种实施例中，本发明的白光发光装置，包括：发光组件，该发光组件具有发光层，该发光层是由氮化物系化合物半导体(例如InGaN)所组成的，且可发出波长介于320至410nm之间的第一光；以及主要是由树脂构成的封装层，包覆该发光组件，该封装层中包含有：荧光增白剂，是4，4-双(2-甲氧基苯乙烯基)联苯，该荧光增白剂将吸收该第一光的一部份，并发出波长介于450至600nm之间的第二光；和光致发光荧光体，包括选自Y、La、Gd与Sm所组成的组群中的至少一种元素和选自Al、Ga与In所组成的组群中的至少一种元素，且由铈致活的石榴石系荧光体，而该光致发光荧光体的化学式为(Y1-p-q-rGdpCeqSmr)3(Al1-sGas)5O12，其中0≤p≤0.8、0.003≤q≤0.2、0.0003≤r≤0.08、和0≤s≤1，该光致发光荧光体可吸收该第一光的一部份与该第二光的一部份，并发出波长介于530nm至590nm之间的第三光，其中，该第一光、该第二光与该第三光在该封装层中进行混合后，会从该封装层向外发射出白光。在该封装层中，树脂的重量百分比为80.00％至94.99％，荧光增白剂的重量百分比为0.01％至5.00％，而光致发光荧光体的重量百分比为5.00％至15.00％。In another embodiment, the white light emitting device of the present invention includes: a light emitting component, the light emitting component has a light emitting layer, the light emitting layer is composed of a nitride-based compound semiconductor (such as InGaN), and can emit light in the wavelength medium The first light between 320 and 410nm; and an encapsulation layer mainly composed of resin, which covers the light-emitting component, and the encapsulation layer contains: a fluorescent whitening agent, which is 4,4-bis(2-methoxy ylstyryl)biphenyl, the fluorescent whitening agent will absorb a part of the first light and emit a second light with a wavelength between 450 and 600nm; and a photoluminescent phosphor comprising Y, At least one element in the group consisting of La, Gd, and Sm and at least one element selected from the group consisting of Al, Ga, and In, and a garnet-based phosphor activated by cerium, and the The chemical formula of photoluminescent phosphor is (Y1-pqr Gdp Ceq Smr )3 (Al1-s Gas )5 O12 , where 0≤p≤0.8, 0.003≤q≤0.2, 0.0003≤r≤ 0.08, and 0≤s≤1, the photoluminescent phosphor can absorb a part of the first light and a part of the second light, and emit a third light with a wavelength between 530nm and 590nm, Wherein, after the first light, the second light and the third light are mixed in the encapsulation layer, white light will be emitted from the encapsulation layer. In the encapsulation layer, the weight percentage of the resin is 80.00% to 94.99%, the weight percentage of the fluorescent whitening agent is 0.01% to 5.00%, and the weight percentage of the photoluminescent phosphor is 5.00% to 15.00%.
实施例Example
将90％的硅树脂、0.01％的4，4-双(2-甲氧基苯乙烯基)联苯荧光增白剂与9.99％的YAG荧光粉经由搅拌脱泡而制得荧光体-树脂混合物，以波长范围为300nm至400nm(波长间隔为5nm)的激发光照射该荧光体-树脂混合物，并记录其荧光强度(μW)对波长(nm)的光谱，如图1所示(荧光体-树脂混合物是以实线-表示)。另外，将90％的硅树脂与10％的YAG经由搅拌脱泡而制得荧光体-树脂混合物，以波长范围为300nm至400nm(波长间隔为5nm)的激发光照射该YAG-树脂混合物，并记录其荧光强度对波长的光谱，如图1所示(YAG-树脂混合物是以虚线...表示)。将图1中的荧光强度除以激发光强度即可换算成发光效率(其单位为流明/瓦(LM/W))，而获得发光效率对波长的光谱，如图2所示(荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示)。90% silicone resin, 0.01% 4,4-bis(2-methoxystyryl) biphenyl fluorescent whitening agent and 9.99% YAG phosphor powder are stirred and defoamed to prepare a phosphor-resin mixture , irradiate the phosphor-resin mixture with excitation light with a wavelength range of 300nm to 400nm (wavelength interval is 5nm), and record the spectrum of its fluorescence intensity (μW) to wavelength (nm), as shown in Figure 1 (phosphor-resin mixture) Resin mixtures are indicated by a solid line -). In addition, 90% silicone resin and 10% YAG are stirred and defoamed to prepare a phosphor-resin mixture, and the YAG-resin mixture is irradiated with excitation light in the wavelength range of 300nm to 400nm (wavelength interval is 5nm), and Record the spectrum of its fluorescence intensity versus wavelength, as shown in Figure 1 (the YAG-resin mixture is represented by a dotted line...). Dividing the fluorescence intensity in Figure 1 by the excitation light intensity can be converted into luminous efficiency (the unit is lumen/watt (LM/W)), and the spectrum of luminous efficiency versus wavelength is obtained, as shown in Figure 2 (phosphor- Resin mixtures are indicated by a solid line -, while YAG-resin mixtures are indicated by a dotted line...).
接着，再特别以波长范围为350nm至395nm(波长间隔为5nm)的激发光，照射上述该荧光体-树脂混合物，并记录其荧光强度对波长的光谱，如图3所示(荧光体-树脂混合物是以实线-表示)。另外，同样以波长范围为350nm至395nm(波长间隔为5nm)的激发光，照射上述该YAG-树脂混合物，并记录其荧光强度对波长的光谱，如图3所示(YAG-树脂混合物是以虚线...表示)。将图3中的荧光强度除以激发光强度即可换算成发光效率，而获得发光效率对波长的光谱，如图4所示(荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示)。另外，将图3中的荧光强度换算成发光效率，而获得发光亮度(LM)对波长的光谱，如图5所示(荧光体-树脂混合物是以实线-表示，而YAG-树脂混合物是以虚线...表示)。Then, especially with excitation light in the wavelength range of 350nm to 395nm (the wavelength interval is 5nm), irradiate the above-mentioned phosphor-resin mixture, and record the spectrum of its fluorescence intensity versus wavelength, as shown in Figure 3 (phosphor-resin Mixtures are indicated by solid lines -). In addition, the above-mentioned YAG-resin mixture is irradiated with excitation light having a wavelength range of 350nm to 395nm (wavelength interval is 5nm), and the spectrum of its fluorescence intensity versus wavelength is recorded, as shown in Figure 3 (the YAG-resin mixture is based on Dotted line...indicates). Dividing the fluorescence intensity in Figure 3 by the excitation light intensity can be converted into luminous efficiency, and the spectrum of luminous efficiency to wavelength is obtained, as shown in Figure 4 (the phosphor-resin mixture is represented by a solid line -, and the YAG-resin Mixtures are indicated by dotted lines...). In addition, the fluorescence intensity in Fig. 3 is converted into luminous efficiency, and the spectrum of luminous brightness (LM) to wavelength is obtained, as shown in Fig. 5 (the phosphor-resin mixture is represented by the solid line -, and the YAG-resin mixture is indicated by a dotted line...).
上述实施例中使用的荧光增白剂仅作为范例，只要是能吸收紫外光而放出近紫光或蓝光的荧光剂均可应用于本发明，作为荧光增白剂，例如1，4-二(苯并唑基-2-基)苯、1，4-二(苯并唑基-2-基)萘、或芘等。The fluorescent whitening agent used in the above-mentioned embodiment is only as an example, as long as it can absorb ultraviolet light and emit near purple light or blue light, the fluorescent agent can be applied to the present invention, as fluorescent whitening agent, such as 1,4-bis(benzene (oxazolyl-2-yl)benzene, 1,4-di(benzoxazolyl-2-yl)naphthalene, or pyrene, etc.
因此，本发明的优点是：以不易产生热的高效率紫外光光源代替蓝光光源，而且与已知白光发光装置相比，本发明使用荧光增白剂，不但可使已知使用蓝光光源与YAG荧光粉的白光发光装置的发光亮度大幅提升，同时本发明白光发光装置的发光效率也获得大幅提升。Therefore, the present invention has the advantages of: replacing the blue light source with a high-efficiency ultraviolet light source that is not easy to generate heat, and compared with the known white light emitting device, the present invention uses a fluorescent whitening agent, which not only makes the known use of blue light source and YAG The luminous brightness of the white light emitting device of the phosphor is greatly improved, and at the same time, the luminous efficiency of the white light emitting device of the present invention is also greatly improved.
对所有熟悉此技术者而言，本发明明显地可以作出多种修改及变化而不脱离本发明的精神和范围。因此，本发明包括该些修改及变化，且其都被包括在下附的权利要求范围及其等同物中。Various modifications and variations of the present invention will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention includes such modifications and changes as are included within the scope of the appended claims and their equivalents.
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| US5966393A (en)* | 1996-12-13 | 1999-10-12 | The Regents Of The University Of California | Hybrid light-emitting sources for efficient and cost effective white lighting and for full-color applications |
| CN1268250A (en)* | 1996-07-29 | 2000-09-27 | 日亚化学工业株式会社 | Light emitting device and display device |
| CN1964085A (en)* | 2005-11-11 | 2007-05-16 | 亿镫光电科技股份有限公司 | Enhanced light emitting device |
| CN101051091A (en)* | 2006-04-03 | 2007-10-10 | 亿镫光电科技股份有限公司 | Brightening element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1268250A (en)* | 1996-07-29 | 2000-09-27 | 日亚化学工业株式会社 | Light emitting device and display device |
| US5966393A (en)* | 1996-12-13 | 1999-10-12 | The Regents Of The University Of California | Hybrid light-emitting sources for efficient and cost effective white lighting and for full-color applications |
| CN1964085A (en)* | 2005-11-11 | 2007-05-16 | 亿镫光电科技股份有限公司 | Enhanced light emitting device |
| CN101051091A (en)* | 2006-04-03 | 2007-10-10 | 亿镫光电科技股份有限公司 | Brightening element |
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