JP6628473B2 - Light emitting device - Google Patents
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- JP6628473B2 JP6628473B2 JP2014265773A JP2014265773A JP6628473B2 JP 6628473 B2 JP6628473 B2 JP 6628473B2 JP 2014265773 A JP2014265773 A JP 2014265773A JP 2014265773 A JP2014265773 A JP 2014265773A JP 6628473 B2 JP6628473 B2 JP 6628473B2
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- 238000007789 sealing Methods 0.000 claims description 86
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 229920002050 silicone resin Polymers 0.000 claims description 26
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 238000000605 extraction Methods 0.000 description 24
- 230000007774 longterm Effects 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 8
- 238000002845 discoloration Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 238000012790 confirmation Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- LAQFLZHBVPULPL-UHFFFAOYSA-N methyl(phenyl)silicon Chemical compound C[Si]C1=CC=CC=C1 LAQFLZHBVPULPL-UHFFFAOYSA-N 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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Description
本発明は、発光装置に関する。 The present invention relates to a light emitting device.
近年、照明用光源として半導体発光素子を搭載した発光装置が利用されており、次世代照明の光源として注目を集めている。この照明用光源に用いられる発光装置は、所望の発光色を得るために、例えば、半導体発光素子と、その半導体発光素子を覆う波長変換部と、波長変換部を覆う透光性部材とを含んで構成される。ここで、波長変換層は、例えば、蛍光体を含む透光性を有する樹脂からなり、透光性部材は、例えば、レンズ形状に成形された透光性を有する樹脂からなる。 2. Description of the Related Art In recent years, light emitting devices equipped with semiconductor light emitting elements have been used as light sources for illumination, and have attracted attention as light sources for next generation illumination. The light-emitting device used for the illumination light source includes, for example, a semiconductor light-emitting element, a wavelength conversion unit covering the semiconductor light-emitting element, and a light-transmitting member covering the wavelength conversion unit in order to obtain a desired emission color. It consists of. Here, the wavelength conversion layer is made of, for example, a light-transmitting resin containing a phosphor, and the light-transmitting member is made of, for example, a resin having a light-transmitting property molded into a lens shape.
この照明用光源に用いられる発光装置には、さらなる光取り出し効率の向上及び信頼性の向上が求められている。
例えば、特許文献１には、半導体発光素子と、半導体発光素子を覆う内部光透過層と、内部光透過層を覆う外部光透過層とを、備える発光装置が開示されている。内部光透過層の屈折率を、外部光透過層の屈折率より高くして光取り出し効率を向上させることが開示されている。半導体発光素子を構成する半導体層の屈折率が高いことを考慮して、内部光透過層の屈折率を、半導体層の屈折率と外部光透過層の屈折率の中間的な値に設定したものである。内部光透過層の材料には、金属アルコキシドにゾル・ゲル法を施して形成されたポリメタロキサンゲル、超微粒子状金属酸化物にゾル・ゲル法を施して形成されたポリメタロキサンゲル、低融点ガラスを使用している。
The light emitting device used for the illumination light source is required to further improve light extraction efficiency and reliability.
For example, Patent Document 1 discloses a light emitting device including a semiconductor light emitting element, an internal light transmitting layer covering the semiconductor light emitting element, and an external light transmitting layer covering the internal light transmitting layer. It is disclosed that the light extraction efficiency is improved by making the refractive index of the internal light transmitting layer higher than the refractive index of the external light transmitting layer. Considering that the refractive index of the semiconductor layer constituting the semiconductor light emitting element is high, the refractive index of the internal light transmitting layer is set to an intermediate value between the refractive index of the semiconductor layer and the refractive index of the external light transmitting layer. It is. Examples of the material of the internal light transmission layer include polymetalloxane gel formed by applying sol-gel method to metal alkoxide, polymetalloxane gel formed by applying sol-gel method to ultrafine metal oxide, Melting glass is used.
また、特許文献２では、ＬＥＤ素子と、蛍光物質を含み、ＬＥＤ素子を覆う光波長変換部と、光波長変換部を覆う透光性部材と、を備えるＬＥＤ光源が開示されている。光波長変換部は、略円柱形状若しくは略円錐台形状を有し、略円柱形状若しくは略円錐台形状の側面は凹状曲面部分を形成している。凹状曲面部分を持つ光波長変換部の屈折率は、レンズ形状に成形された透光性部材の屈折率よりも小さいことが開示されている。すなわち、光波長変換部の形状が略円柱形状若しくは略円錐台形状であってかつその側面が特定の凹状曲面であるときには、光波長変換部の屈折率が透光性部材の屈折率より小さい場合に光取り出し効率が高くなることが示されている。一方、光波長変換部の屈折率が透光性部材の屈折率より大きい場合であっても、光波長変換部の形状を最適化することにより、光取り出し効果が向上すると記載されている。透光性部材の材質は、エポキシ樹脂を使用している。 Patent Literature 2 discloses an LED light source that includes an LED element, a light wavelength conversion unit that includes a fluorescent substance, and covers the LED element, and a translucent member that covers the light wavelength conversion unit. The light wavelength conversion unit has a substantially cylindrical shape or a substantially truncated cone shape, and the substantially cylindrical or substantially truncated cone-shaped side surface forms a concave curved surface portion. It is disclosed that the refractive index of a light wavelength conversion section having a concave curved surface portion is smaller than the refractive index of a light-transmitting member formed into a lens shape. That is, when the shape of the light wavelength conversion portion is substantially cylindrical or substantially truncated cone and the side surface is a specific concave curved surface, the refractive index of the light wavelength conversion portion is smaller than the refractive index of the light transmitting member. It is shown that the light extraction efficiency is increased. On the other hand, it is described that, even when the refractive index of the light wavelength conversion part is larger than the refractive index of the translucent member, the light extraction effect is improved by optimizing the shape of the light wavelength conversion part. The material of the translucent member uses an epoxy resin.
しかしながら、初期性能において光取り出し効率を高くしても、長期間の使用により透光性部材が変色して出力が低下することがある。 However, even if the light extraction efficiency is increased in the initial performance, the light-transmitting member may be discolored and the output may be reduced due to long-term use.
そこで、光取り出し効率が高く、樹脂の変色による出力低下が抑制された発光装置を提供することを目的とする。 Accordingly, it is an object of the present invention to provide a light emitting device having high light extraction efficiency and suppressing a decrease in output due to discoloration of resin.
本実施形態にかかる発光装置は、発光素子と、前記発光素子を覆う第一封止部材と、前記第一封止部材を覆う第二封止部材と、を備え、前記第一封止部材及び前記第二封止部材はそれぞれシリコーン樹脂を主成分として含み、前記第一封止部材の第一屈折率は、前記第二封止部材の第二屈折率より小さい。 The light emitting device according to the present embodiment includes a light emitting element, a first sealing member covering the light emitting element, and a second sealing member covering the first sealing member, and the first sealing member and The second sealing members each include a silicone resin as a main component, and the first refractive index of the first sealing member is smaller than the second refractive index of the second sealing member.
本発明の実施形態に係る発光装置は、光取り出し効率が高く、樹脂の変色による出力低下および色ずれが抑制された発光装置を提供することができる。 The light-emitting device according to the embodiment of the present invention can provide a light-emitting device with high light extraction efficiency and with suppressed output reduction and color shift due to discoloration of the resin.
以下、図面を参照しながら実施形態に係る発光装置について説明する。図１は、実施形態にかかる発光装置の模式平面図である。図２は、実施形態にかかる発光装置の模式断面図である。図２は、図１のＩＩ−ＩＩ線の断面図である。
本実施形態の発光装置は、導電性部材５が配置された支持体６と、支持体６上に載置された発光素子１と、発光素子１を覆う波長変換部材２と、波長変換部材２と支持体６の一部とを覆う第一封止部材３と、第一封止部材３を覆う第二封止部材４とを備える。波長変換部材２は層状に設けてもよい。第二封止部材４は、例えば、凸レンズ形状を成している。発光素子１と導電性部材５とは、接合部材７を用いて電気的に接合している。支持体６の上面には導電性部材５が配置されており、支持体６の下面には正極の電極端子９、負極の電極端子１０が配置されており、導電性部材５と、正極の電極端子９、負極の電極端子１０とは、貫通孔等を介して電気的に接続している。発光素子１の外周の波長変換部材２上には、発光素子１からの光や外部からの光を効率的に反射する反射部材８が設けられている。
Hereinafter, a light emitting device according to an embodiment will be described with reference to the drawings. FIG. 1 is a schematic plan view of the light emitting device according to the embodiment. FIG. 2 is a schematic cross-sectional view of the light emitting device according to the embodiment. FIG. 2 is a sectional view taken along line II-II in FIG.
The light emitting device according to the present embodiment includes a support 6 on which a conductive member 5 is disposed, a light emitting element 1 placed on the support 6, a wavelength conversion member 2 covering the light emitting element 1, and a wavelength conversion member 2. A first sealing member covering the first sealing member; and a second sealing member covering the first sealing member. The wavelength conversion member 2 may be provided in a layer shape. The second sealing member 4 has, for example, a convex lens shape. The light emitting element 1 and the conductive member 5 are electrically connected using the bonding member 7. The conductive member 5 is disposed on the upper surface of the support 6, and the positive electrode terminal 9 and the negative electrode terminal 10 are disposed on the lower surface of the support 6. The conductive member 5 and the positive electrode The terminal 9 and the negative electrode terminal 10 are electrically connected through a through hole or the like. On the wavelength conversion member 2 on the outer periphery of the light emitting element 1, a reflecting member 8 that efficiently reflects light from the light emitting element 1 and light from the outside is provided.
ここで、発光素子１は、例えば、成長基板上に、半導体層を含む半導体積層構造を有し、成長基板側を主光取出し面としており、支持体６上にフリップチップ実装にて搭載されている。支持体６の表面には正負の導電性部材が設けられ、発光素子１と導電性部材とは例えば導電性の接合部材を介して電気的に接続される。また、波長変換部材２は、発光素子１より放出される光の波長を変換して異なる波長の光を出射する。 Here, the light emitting element 1 has, for example, a semiconductor laminated structure including a semiconductor layer on a growth substrate, and has the growth substrate side as a main light extraction surface, and is mounted on the support 6 by flip chip mounting. I have. Positive and negative conductive members are provided on the surface of the support 6, and the light emitting element 1 and the conductive member are electrically connected via, for example, a conductive bonding member. Further, the wavelength conversion member 2 converts the wavelength of light emitted from the light emitting element 1 and emits light of a different wavelength.
また、第一封止部材３及び第二封止部材４はそれぞれシリコーン樹脂を主成分として含んでいる。シリコーン樹脂は、エポキシ樹脂よりも耐熱性および耐光性が高い。第一封止部材３及び第二封止部材４がそれぞれシリコーン樹脂を主成分として含むことにより、長期間にわたって安定して発光する発光装置を提供できる。 The first sealing member 3 and the second sealing member 4 each contain a silicone resin as a main component. Silicone resin has higher heat resistance and light resistance than epoxy resin. Since the first sealing member 3 and the second sealing member 4 each include a silicone resin as a main component, a light emitting device that emits light stably for a long period of time can be provided.
それぞれシリコーン樹脂を主成分として含む第一封止部材３と第二封止部材４とを用いて発光装置を構成する場合、第一封止部材３の屈折率と第二封止部材４の屈折率を共に大きくした方が取り出し効率は高くなるものの、屈折率がある値より大きくなると長期間の使用により封止部材が変色し易くなり、光の取り出し効率の劣化、色ずれも大きくなる。 When the light emitting device is configured using the first sealing member 3 and the second sealing member 4 each containing a silicone resin as a main component, the refractive index of the first sealing member 3 and the refraction of the second sealing member 4. When both the refractive indices are increased, the extraction efficiency is increased. However, when the refractive index is larger than a certain value, the sealing member is liable to be discolored due to long-term use, and the light extraction efficiency is deteriorated and the color shift is increased.
それぞれシリコーン樹脂を主成分として含む第一封止部材３と第二封止部材４とを用いて発光装置を構成する場合には、第一封止部材３の第一屈折率を、第二封止部材４の第二屈折率より小さくなるように設定することにより、比較的高い光の取り出し効率を確保することができる。また、発光装置を長期間使用した場合であっても第一封止部材３及び第二封止部材４の変色が抑制される。 When the light emitting device is configured using the first sealing member 3 and the second sealing member 4 each containing a silicone resin as a main component, the first refractive index of the first sealing member 3 is set to the second sealing member. By setting the stop member 4 to be smaller than the second refractive index, a relatively high light extraction efficiency can be secured. Further, even when the light emitting device is used for a long time, discoloration of the first sealing member 3 and the second sealing member 4 is suppressed.
そこで、本実施形態の発光装置では、第一封止部材３及び第二封止部材４はそれぞれシリコーン樹脂を主成分として含むものとし、かつ第一封止部材３の第一屈折率を、第二封止部材４の第二屈折率より小さくなるように設定している。これにより、光の取り出し効率を高くしつつ、長期間使用した場合であっても第一封止部材３及び第二封止部材４の変色を抑制することができる。 Therefore, in the light emitting device of the present embodiment, the first sealing member 3 and the second sealing member 4 each include a silicone resin as a main component, and the first refractive index of the first sealing member 3 is set to the second refractive index. It is set to be smaller than the second refractive index of the sealing member 4. Thereby, the discoloration of the first sealing member 3 and the second sealing member 4 can be suppressed even when the device is used for a long time, while increasing the light extraction efficiency.
すなわち、第一封止部材３は、シリコーン樹脂を主成分として含んでいるとはいえ、発光素子１の直近にあるため発光素子１による光や熱の影響を強く受け、変色しやすい環境にある。この点を考慮して、第一封止部材３に主成分として含まれるシリコーン樹脂を第二封止部材４に主成分として含まれるシリコーン樹脂より屈折率が低いものとし、耐光性及び耐熱性をより高めている。長期間の使用による変色を効果的に抑えるためには、第一封止部材３に主成分として含まれるシリコーン樹脂の屈折率は１．４２以上１．５０以下であることが好ましい。屈折率の調整は、例えば、メチルフェニルシリコーン樹脂を用いる場合には、メチル基に対するフェニル基の割合を調整することにより、所望の屈折率を実現できる。
具体的には、メチルフェニルシリコーン樹脂は、メチル基に対するフェニル基の割合を高くすることにより、屈折率を高くすることができる。しかしながら、フェニル基の割合を高くし過ぎると変色しやすくなり、光取り出し効率を劣化させる原因となる。
That is, although the first sealing member 3 contains the silicone resin as a main component, it is located in the immediate vicinity of the light emitting element 1 and thus is strongly influenced by light and heat by the light emitting element 1 and is in an environment where the color is easily changed. . In consideration of this point, the silicone resin contained as a main component in the first sealing member 3 has a lower refractive index than the silicone resin contained as a main component in the second sealing member 4, and has light resistance and heat resistance. More expensive. In order to effectively suppress discoloration due to long-term use, the refractive index of the silicone resin contained as a main component in the first sealing member 3 is preferably 1.42 or more and 1.50 or less. For example, when a methylphenyl silicone resin is used, a desired refractive index can be achieved by adjusting the ratio of a phenyl group to a methyl group.
Specifically, the methylphenyl silicone resin can increase the refractive index by increasing the ratio of phenyl groups to methyl groups. However, if the ratio of the phenyl group is too high, the color tends to be discolored, which causes the light extraction efficiency to deteriorate.
また、第二封止部材４は、発光素子１からの光の影響が第一封止部材３よりも小さく、また発光装置の光取り出し効率を高くするためには、第二封止部材４の屈折率を高くすることが好ましい。そこで、第二封止部材４に主成分として含まれるシリコーン樹脂の屈折率を、第一封止部材３に主成分として含まれるシリコーン樹脂をより高くして、光取り出し効率を高くしている。第二封止部材４に主成分として含まれるシリコーン樹脂の屈折率は、１．５１以上１．５４以下であることが好ましく、これにより、光取り出し効率を高くしつつ、かつ長期間の使用による第二封止部材４自身の変色を抑えることができる。 Further, the second sealing member 4 is less affected by light from the light emitting element 1 than the first sealing member 3, and in order to increase the light extraction efficiency of the light emitting device, the second sealing member 4 It is preferable to increase the refractive index. Therefore, the refractive index of the silicone resin contained as a main component in the second sealing member 4 is made higher than that of the silicone resin contained in the first sealing member 3 as a main component, thereby increasing the light extraction efficiency. The refractive index of the silicone resin contained as a main component in the second sealing member 4 is preferably 1.51 or more and 1.54 or less, whereby the light extraction efficiency can be increased and the silicone resin can be used for a long time. Discoloration of the second sealing member 4 itself can be suppressed.
また、第二封止部材４に主成分として含まれるシリコーン樹脂の屈折率を、第一封止部材３に主成分として含まれるシリコーン樹脂の屈折率より高くすることにより、第一封止部材３と第二封止部材４の界面における全反射を防ぐことができ、光の損失を減らすことができる。 Further, by setting the refractive index of the silicone resin contained as a main component in the second sealing member 4 higher than the refractive index of the silicone resin contained as a main component in the first sealing member 3, And total reflection at the interface between the first sealing member 4 and the second sealing member 4 can be prevented, and light loss can be reduced.
ここで、本明細書における屈折率は（株）アタゴ製アッベ屈折計にて２５℃条件下、液状状態、ナトリウムD線（５８９ｎｍ）の屈折率をいう。
また、第一封止部材３の膜厚は波長変換部材２および反射部材８の剥がれを防止する為に両者を被覆する様に形成する厚さであることが好ましい。第一封止部材３の厚さは、好ましくは１μｍ〜１５０μｍである。より好ましくは１０μｍ〜１００μｍである。特に好ましくは３０μｍ〜８０μｍである。
Here, the refractive index in the present specification refers to the refractive index of sodium D line (589 nm) in a liquid state at 25 ° C. using an Abbe refractometer manufactured by Atago Co., Ltd.
Further, the film thickness of the first sealing member 3 is preferably a thickness formed so as to cover both the wavelength conversion member 2 and the reflection member 8 in order to prevent the wavelength conversion member 2 and the reflection member 8 from peeling off. The thickness of the first sealing member 3 is preferably 1 μm to 150 μm. More preferably, it is 10 μm to 100 μm. Particularly preferably, it is 30 μm to 80 μm.
・評価１
本実施形態の発光装置の効果を実証するために、図１及び図２に示す構成の発光装置を作製して、光取り出し効率（相対光束）と長期信頼性（通電による色ずれ確認）を評価した。
ここでは、屈折率の異なるシリコーン樹脂を用いた６種類の発光装置を作製して評価した。この評価１では、各発光装置において、第一封止部材３及び第二封止部材４を屈折率が同じシリコーン樹脂により形成した。
発光素子１は発光ピーク波長４５０ｎｍの発光ダイオードであり、フリップチップ状態で導電性部材５上に接合部材７（例えばＡｕバンプ）を使用し載置される。
波長変換部材２はＹＡＧ系の蛍光体粒子（平均粒径８μｍ）を用い、電着法にて発光素子１を覆うように形成する。波長変換部材２の厚みは約３０μｍである。
反射部材８は酸化チタン（平均粒径約０．３μｍ）を用い、電着法にて発光素子１上の波長変換部材２以外の波長変換部材２上を覆う様に形成する。反射部材８の厚みは約２０μｍである。
第一封止部材３は、透光性樹脂であり、波長変換部材２および反射部材８の剥がれ防止の為、第一封止部材を含浸させ、また、両者を被覆する様に形成する。第一封止部材３はシリコーン樹脂を用いる。
第二封止部材４は、第一封止部材同様に透光性樹脂であり、圧縮成形により形成し、凸レンズ形状を有しており、第一封止部材と同一の材料としている。
また、光取り出し効率は、第一封止部材、第二封止部材の屈折率がともに１．４９６である発光装置の光束を１００とし、これを基準として、他の屈折率条件における出力値を算出した。長期信頼性試験（通電による色ずれ確認）は、常温で一定時間通電した後の初期値からの色ずれ量により評価した。その結果を、以下の表１に示す。
・ Evaluation 1
In order to demonstrate the effect of the light emitting device of the present embodiment, a light emitting device having the configuration shown in FIGS. 1 and 2 was manufactured, and light extraction efficiency (relative luminous flux) and long-term reliability (confirmation of color shift due to energization) were evaluated. did.
Here, six types of light emitting devices using silicone resins having different refractive indexes were manufactured and evaluated. In Evaluation 1, in each light emitting device, the first sealing member 3 and the second sealing member 4 were formed of a silicone resin having the same refractive index.
The light-emitting element 1 is a light-emitting diode having an emission peak wavelength of 450 nm, and is mounted on the conductive member 5 in a flip-chip state using a bonding member 7 (for example, an Au bump).
The wavelength conversion member 2 is formed using YAG-based phosphor particles (average particle diameter: 8 μm) so as to cover the light emitting element 1 by an electrodeposition method. The thickness of the wavelength conversion member 2 is about 30 μm.
The reflecting member 8 is formed using titanium oxide (average particle size: about 0.3 μm) so as to cover the wavelength conversion members 2 other than the wavelength conversion member 2 on the light emitting element 1 by an electrodeposition method. The thickness of the reflection member 8 is about 20 μm.
The first sealing member 3 is a translucent resin, and is formed so as to impregnate the first sealing member and cover both of the wavelength conversion member 2 and the reflection member 8 in order to prevent the wavelength conversion member 2 and the reflection member 8 from peeling off. The first sealing member 3 uses a silicone resin.
The second sealing member 4 is a light-transmitting resin like the first sealing member, is formed by compression molding, has a convex lens shape, and is made of the same material as the first sealing member.
In addition, the light extraction efficiency is defined as 100 with the luminous flux of the light emitting device in which the refractive indexes of the first sealing member and the second sealing member are both 1.496, and the output value under other refractive index conditions is set based on this. Calculated. The long-term reliability test (confirmation of color misregistration by energization) was evaluated based on the amount of color misregistration from an initial value after energization at room temperature for a certain time. The results are shown in Table 1 below.
表１に示すように、屈折率が高くなるにつれ相対光束が高くなる傾向を示した。しかし、屈折率上昇させると発光装置の長期信頼性に関わる通電試験色ずれ量が大きくなる傾向が確認された。具体的には、表１に示すように、屈折率を例えば、１．５５とした場合、初期的に光取り出し効率が向上するが、長期間の使用により第一、第二封止部材３，４を構成する樹脂が変色して光取り出し効率は低下して発光出力が低下、及び色ずれが発生する。この樹脂の変色による光取り出し効率の低下は、主として、発光素子直近の第一封止部材３の樹脂の劣化が原因である。また、第一封止部材３と第二封止部材４の屈折率を同じにし、屈折率が１．４２より低くなると、目標とする光取り出し効率が得られない。 As shown in Table 1, the relative luminous flux tended to increase as the refractive index increased. However, it was confirmed that when the refractive index was increased, the amount of color shift in the power-on test related to the long-term reliability of the light emitting device tended to increase. Specifically, as shown in Table 1, when the refractive index is set to, for example, 1.55, the light extraction efficiency is initially improved, but the first and second sealing members 3 and 3 are used over a long period of time. The resin constituting 4 is discolored, the light extraction efficiency is reduced, the light emission output is reduced, and color shift occurs. The decrease in the light extraction efficiency due to the discoloration of the resin is mainly caused by the deterioration of the resin of the first sealing member 3 near the light emitting element. If the refractive indexes of the first sealing member 3 and the second sealing member 4 are the same and the refractive index is lower than 1.42, the target light extraction efficiency cannot be obtained.
・評価２
評価１により屈折率が高くなることで光束が高くなることが確認されたが、評価２では、第二封止部材４の屈折率を１．５３５とし、第一封止部材３の屈折率を１．４６，１．４８４，１．４９６，１．５２２とした４種類の発光装置を作製して光取り出し効率（相対光束）と長期信頼性（通電による色ずれ確認）を評価した。光取り出し効率の評価は、第二封止部材４の屈折率を１．５３５とし、第一封止部材３の屈折率を１．４６０とした発光装置の光束を100とし、これを基準として、相対光束により評価した。長期信頼性（通電による色ずれ確認）については、評価１と同様にした。
その結果を以下の表２に示す。
・ Evaluation 2
Evaluation 1 confirmed that the luminous flux was increased by increasing the refractive index. However, in Evaluation 2, the refractive index of the second sealing member 4 was set to 1.535, and the refractive index of the first sealing member 3 was set to 1.535. Four types of light emitting devices of 1.46, 1.484, 1.496 and 1.522 were manufactured, and light extraction efficiency (relative luminous flux) and long-term reliability (color shift confirmation by energization) were evaluated. The light extraction efficiency was evaluated by setting the refractive index of the second sealing member 4 to 1.535, the refractive index of the first sealing member 3 to 1.460, and the luminous flux of the light-emitting device to 1.460. It was evaluated by relative luminous flux. The long-term reliability (confirmation of color shift by energization) was the same as in Evaluation 1.
The results are shown in Table 2 below.
表２に示した結果から、第二封止部材４の屈折率を１．５３５に固定した場合、第一封止部材３の屈折率を、１．４６０まで低くしても相対光束を低下させることなく、長期信頼性に関わる通電試験色ずれを抑えることできることが確認された。また、長期信頼性に関わる通電試験色ずれを抑えるために、第一封止部材３の屈折率は１．５０以下であることが好ましいことがわかる。 From the results shown in Table 2, when the refractive index of the second sealing member 4 is fixed at 1.535, the relative luminous flux is reduced even if the refractive index of the first sealing member 3 is reduced to 1.460. It was confirmed that the color shift in the current test related to the long-term reliability could be suppressed without any problem. In addition, it can be seen that the refractive index of the first sealing member 3 is preferably 1.50 or less in order to suppress the color shift in the current test related to long-term reliability.
１ 発光素子
２ 波長変換部材
３ 第一封止部材
４ 第二封止部材
５ 導電性部材
６ 支持体
７ 接合部材
８ 反射部材
９ 正極の電極端子
１０ 負極の電極端子
REFERENCE SIGNS LIST 1 light emitting element 2 wavelength conversion member 3 first sealing member 4 second sealing member 5 conductive member 6 support 7 bonding member 8 reflecting member 9 positive electrode terminal 10 negative electrode terminal
Claims (5)
前記発光素子を覆う第一封止部材と、
前記第一封止部材を覆う第二封止部材と、
を備え、
前記第一封止部材及び前記第二封止部材はそれぞれシリコーン樹脂を主成分として含み、前記第一封止部材の第一屈折率は、１．４６以上１．５０以下であり、前記第二封止部材の第二屈折率は、１．５１以上１．５４以下であり、
前記シリコーン樹脂はメチル基とフェニル基を含み、
前記第一封止部材に含まれるシリコーン樹脂におけるメチル基に対するフェニル基の割合は、前記第二封止部材に含まれるシリコーン樹脂におけるメチル基に対するフェニル基の割合より小さいことを特徴とする発光装置。 A light emitting element,
A first sealing member that covers the light emitting element,
A second sealing member that covers the first sealing member,
With
The first sealing member and the second sealing member each include a silicone resin as a main component, the first refractive index of the first sealing member is 1.46 or more and 1.50 or less, The second refractive index of the sealing member is 1.51 or more and 1.54 or less,
The silicone resin contains a methyl group and a phenyl group,
The light emitting device according to claim 1, wherein a ratio of a phenyl group to a methyl group in the silicone resin included in the first sealing member is smaller than a ratio of a phenyl group to a methyl group in the silicone resin included in the second sealing member.
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