JP2006179684A - Light emitting device - Google Patents

Light emitting device Download PDF

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JP2006179684A
JP2006179684A JP2004371474A JP2004371474A JP2006179684A JP 2006179684 A JP2006179684 A JP 2006179684A JP 2004371474 A JP2004371474 A JP 2004371474A JP 2004371474 A JP2004371474 A JP 2004371474A JP 2006179684 A JP2006179684 A JP 2006179684A
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wavelength conversion
light
transparent
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phase
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JP4866003B2 (en
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Keiji Shibata
圭史 柴田
Takao Hayashi
隆夫 林
Keiichi Yamazaki
圭一 山崎
Naoko Doi
尚子 土井
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device in which light emitted from a light emitting element can be wavelength-converted to obtain the light emission of a desirable color and a sufficient light fetching efficiency is provided. <P>SOLUTION: The light emitting device is provided with a light emitting element 1, and a wavelength conversion layer 2 which contains a wavelength conversion substance of wavelength-converting light emitted from this light emitting element 1. The wavelength conversion layer 2 has a wavelength conversion division 3 containing the wavelength conversion substance and a transparent division 4 which has the smaller content of the wavelength conversion substance than in the wavelength conversion division 3. For this reason, the light after having transmitted the wavelength conversion layer 2 contains the wavelength converted one with the wavelength conversion substance in the wavelength conversion division 3, and light having a different hue from a light color emitted from the light emitting element 1 is emitted from the light emitting device A. Further, in the transparent division 4, it is harder for light to scatter due to the wavelength conversion substance than when transmitting the wavelength conversion division 3, and an amount of light which transmits the wavelength conversion layer 2 can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、LED等の発光素子から発せられる光を波長変換して出射するLED発光装置等の発光装置に関するものである。   The present invention relates to a light-emitting device such as an LED light-emitting device that converts the wavelength of light emitted from a light-emitting element such as an LED.

LED発光装置等の発光装置は小型、軽量、省電力といった長所があり、現在、表示用光源、小型電球の代替、あるいは液晶パネル用光源等として広く用いられている。このような発光装置は、LED等の発光素子から構成されるが、必要に応じてこの発光素子から発せられる光を種々の蛍光体等の波長変換物質を通過させることにより、発光素子の元々の発光色とは異なる色合いの光を発する発光装置も開発されてきている。   Light-emitting devices such as LED light-emitting devices have advantages such as small size, light weight, and power saving, and are currently widely used as a light source for display, a small light bulb, or a light source for liquid crystal panels. Such a light-emitting device is composed of a light-emitting element such as an LED. If necessary, the light emitted from the light-emitting element is passed through various wavelength-converting substances such as phosphors so that the original light-emitting element can be used. A light emitting device that emits light of a color different from the emission color has also been developed.

特に近年、窒化ガリウム系化合物半導体による青色光、あるいは紫外線を放射するLEDチップが開発されており、これらの発光素子を種々の波長変換物質と組合わせることにより、白色を含め、種々の色合いの光を出す発光装置の開発が試みられている。   In recent years, LED chips that emit blue light or ultraviolet light using gallium nitride compound semiconductors have been developed. By combining these light emitting elements with various wavelength conversion materials, light of various colors including white can be obtained. Attempts have been made to develop light emitting devices that emit light.

このような発光装置における波長変換物質の固定方法としては、1個または複数個の発光素子を実装基板に搭載し、この発光素子の搭載部分に波長変換物質を分散して含有する樹脂等からなる波長変換層を配設して発光部を形成する方法が一般的である(特許文献1参照)。
特開2003−046133号公報
As a method for fixing the wavelength converting substance in such a light emitting device, one or a plurality of light emitting elements are mounted on a mounting substrate, and the wavelength converting substance is dispersed and contained in the mounting part of the light emitting elements. A method of forming a light emitting portion by disposing a wavelength conversion layer is generally used (see Patent Document 1).
JP 2003-046133 A

しかし、発光素子から発せられる光が波長変換層を通過する際には、この波長変換層に分散されている波長変換物質によって光が散乱されやすく、このため十分な光量を確保することが困難な場合があり、発光素子からの光取り出し効率が低下するという問題があった。   However, when the light emitted from the light emitting element passes through the wavelength conversion layer, the light is easily scattered by the wavelength conversion material dispersed in the wavelength conversion layer, and thus it is difficult to secure a sufficient amount of light. In some cases, the light extraction efficiency from the light emitting element is reduced.

本発明は上記の点に鑑みて為されたものであり、発光素子から発せられる光を波長変換して所望の色の発光を得ることができ、且つ十分な光取り出し効率を有する発光装置を提供することを目的とするものである。   The present invention has been made in view of the above points, and provides a light-emitting device capable of obtaining light of a desired color by converting the wavelength of light emitted from a light-emitting element and having sufficient light extraction efficiency. It is intended to do.

本発明に係る発光装置Aは、発光素子1と、この発光素子1から発せられる光を波長変換する波長変換物質を含有する波長変換層2とを備えた発光装置Aにおいて、前記波長変換層2が、波長変換物質を含有する波長変換区画3と、前記波長変換区画3よりも波長変換物質の含有量が少ない透明区画4とを有することを特徴とするものである。このため、発光素子1から発せられる光が波長変換層2を透過する際に、その一部が波長変換区画3を透過し、この際に更にその一部が波長変換物質により波長変換される。また前記光の他の一部は透明区画4を透過し、或いは透明区画4を経由して透明区画4と波長変換区画3との界面から波長変換区画3へ入射された後に、外部に取り出される。これにより波長変換層2を透過した後の光には、波長変換物質により波長変換がなされたものが含まれることとなって、発光素子1からの発光色とは異なる色合いの光を発光装置Aから発することができる。更に、透明区画4においては波長変換区画3を透過する場合よりも波長変換物質による光の散乱が生じにくくなり、これにより波長変換層2を透過する光の光量を向上することができる。   The light-emitting device A according to the present invention is a light-emitting device A including the light-emitting element 1 and a wavelength conversion layer 2 containing a wavelength conversion material that converts the wavelength of light emitted from the light-emitting element 1. However, it has the wavelength conversion zone 3 containing a wavelength conversion substance, and the transparent division 4 with less content of a wavelength conversion substance than the said wavelength conversion zone 3. It is characterized by the above-mentioned. For this reason, when the light emitted from the light emitting element 1 is transmitted through the wavelength conversion layer 2, a part of the light is transmitted through the wavelength conversion section 3, and at this time, a part of the light is further wavelength-converted by the wavelength conversion substance. The other part of the light passes through the transparent section 4 or is incident on the wavelength conversion section 3 from the interface between the transparent section 4 and the wavelength conversion section 3 via the transparent section 4 and then extracted outside. . As a result, the light that has been transmitted through the wavelength conversion layer 2 includes light that has been wavelength-converted by the wavelength conversion material, and light having a color different from the color emitted from the light-emitting element 1 is emitted from the light-emitting device A. Can be emitted from. Furthermore, in the transparent section 4, light scattering due to the wavelength conversion substance is less likely to occur than in the case of transmitting through the wavelength conversion section 3, whereby the amount of light transmitted through the wavelength conversion layer 2 can be improved.

このような発光装置Aでは、上記波長変換区画3が、波長変換物質を含有する波長変換相5と、この波長変換相5よりも波長変換物質の含有量が少ない透明相6とを積層して形成されると共に、上記透明区画4が透明相6のみで形成されるようにすることができる。この場合、波長変換相5と透明相6とを積層成形するだけで波長変換区画3を形成することができ、生産性を向上することができる。   In such a light emitting device A, the wavelength conversion section 3 is formed by laminating the wavelength conversion phase 5 containing the wavelength conversion material and the transparent phase 6 having a smaller content of the wavelength conversion material than the wavelength conversion phase 5. In addition to being formed, the transparent section 4 can be formed of only the transparent phase 6. In this case, the wavelength conversion section 3 can be formed only by laminating the wavelength conversion phase 5 and the transparent phase 6, and productivity can be improved.

また、上記波長変換区画3が波長変換物質を含有する波長変換相5を含み、且つ前記波長変換相5が、この波長変換相5よりも波長変換物質の含有量が少ない透明相6から構成される母基材7に設けられた凹部8又は貫通部に波長変換物質を充填して形成されるようにしてしても良い。この場合、凹部8又は貫通部に波長変換物質を充填するだけで波長変換相5を形成することができて生産性を向上することができる。   Further, the wavelength conversion section 3 includes a wavelength conversion phase 5 containing a wavelength conversion substance, and the wavelength conversion phase 5 is composed of a transparent phase 6 having a smaller content of the wavelength conversion substance than the wavelength conversion phase 5. Alternatively, the concave portion 8 or the penetrating portion provided in the mother base 7 may be filled with a wavelength conversion substance. In this case, the wavelength conversion phase 5 can be formed only by filling the concave portion 8 or the penetrating portion with the wavelength conversion substance, and the productivity can be improved.

また、このように母基材7の凹部8又は貫通部に波長変換相5を形成する場合には、母基材7における凹部8開口での波長変換相5の露出部分が、透明相6にて構成される蓋部材9にて閉塞されるようにしても良い。この場合、凹部8又は貫通部に充填した波長変換物質の飛散や漏洩を蓋部材9により防止することができ、またそのために生産時の歩留まりを向上することができる。   Further, when the wavelength conversion phase 5 is formed in the concave portion 8 or the through portion of the base material 7 in this way, the exposed portion of the wavelength conversion phase 5 at the opening of the concave portion 8 in the base material 7 becomes the transparent phase 6. You may make it close | close with the cover member 9 comprised. In this case, scattering and leakage of the wavelength converting substance filled in the concave portion 8 or the penetrating portion can be prevented by the lid member 9, and therefore the yield during production can be improved.

上記のような波長変換層2においては、上記波長変換区画3の最小幅寸法が0.1mm以下となるようにすることが好ましい。このようにすると、微細な波長変換区画3が波長変換層2に分散することから、波長変換区画3を透過することにより波長変換された光が発光装置Aからの発光中に均一に分散して混在することとなり、色むらの発生を著しく低減することができる。   In the wavelength conversion layer 2 as described above, it is preferable that the minimum width dimension of the wavelength conversion section 3 is 0.1 mm or less. In this way, since the fine wavelength conversion section 3 is dispersed in the wavelength conversion layer 2, the light that has been wavelength-converted by being transmitted through the wavelength conversion section 3 is uniformly dispersed during light emission from the light emitting device A. As a result, color unevenness can be significantly reduced.

また、上記波長変換層2の、波長変換区画3と透明区画4との、発光素子1からの光の取り出し方向への投影面積の比は5:1〜1:5の範囲となるようにすることが好ましい。このようにすると、透明区画4を透過する光、すなわち波長変換物質による散乱を受けずに波長変換層2を透過する光の光量を十分に確保して発光装置Aからの発光光量を十分に高く維持することができ、且つこの範囲で波長変換区画3と透明区画4との割合を変化させて発光色の調整をすることができる。   Moreover, the ratio of the projected area of the wavelength conversion layer 2 in the direction of extracting light from the light emitting element 1 between the wavelength conversion section 3 and the transparent section 4 is set in a range of 5: 1 to 1: 5. It is preferable. If it does in this way, the light quantity of the light which permeate | transmits the transparent division 4, ie, the light which permeate | transmits the wavelength conversion layer 2 without being scattered by the wavelength conversion substance, is ensured enough, and the emitted light quantity from the light-emitting device A is made high enough. The emission color can be adjusted by changing the ratio between the wavelength conversion section 3 and the transparent section 4 within this range.

本発明によれば、波長変換層に波長変換区画を設けることで発光色の色合いを変更し、発光素子からの発光色とは異なる色合いの光を発光装置から発することができるものであり、且つ透明区画を設けることで波長変換層における光の透過量を確保することができ、これにより発光装置からの光の取り出し効率を向上することができるものである。   According to the present invention, by providing a wavelength conversion section in the wavelength conversion layer, the hue of the emission color can be changed, and light having a hue different from the emission color from the light emitting element can be emitted from the light emitting device, and By providing the transparent section, it is possible to secure the amount of light transmitted through the wavelength conversion layer, thereby improving the light extraction efficiency from the light emitting device.

以下、本発明を実施するための最良の形態を説明する。   Hereinafter, the best mode for carrying out the present invention will be described.

図1(a)に示す発光装置Aは、基板10に発光素子1と波長変換層2とを設けて構成することができる。   A light emitting device A shown in FIG. 1A can be configured by providing a light emitting element 1 and a wavelength conversion layer 2 on a substrate 10.

基板10としては適宜のものを適用することができるが、例えば樹脂基板やセラミックス基板を用いることができる。   As the substrate 10, an appropriate one can be applied. For example, a resin substrate or a ceramic substrate can be used.

また、発光素子1としても適宜のものを用いることができるが、例えばLEDチップ等を用いることができる。   Moreover, although the appropriate thing can be used also as the light emitting element 1, an LED chip etc. can be used, for example.

この発光素子1は基板10に一又は複数個搭載するものであり、図示の例では基板10の一面に凹所11を形成して、その底部に発光素子1を搭載している。また基板10には必要に応じて発光素子1への給電や制御信号の伝達等のための導体配線を形成する。   One or a plurality of the light emitting elements 1 are mounted on the substrate 10. In the illustrated example, the recess 11 is formed on one surface of the substrate 10, and the light emitting element 1 is mounted on the bottom thereof. In addition, conductor wiring for supplying power to the light emitting element 1 and transmitting control signals is formed on the substrate 10 as necessary.

波長変換層2は、発光素子1に対して、その光取り出し方向側に配置される。図示の例では、基板10における凹所11の開口側にその開口径が大きくなった配置部12が設けられており、波長変換層2はこの配置部12に配設されている。   The wavelength conversion layer 2 is disposed on the light extraction direction side with respect to the light emitting element 1. In the example shown in the figure, an arrangement portion 12 having a larger opening diameter is provided on the opening side of the recess 11 in the substrate 10, and the wavelength conversion layer 2 is provided in the arrangement portion 12.

波長変換層2は、波長変換区画3と透明区画4とを有している。この波長変換区画3と透明区画4とは、発光素子1からの光の取り出し方向と直交又は交差する方向、図示の例では波長変換層2の面方向で区分けされた区画である。   The wavelength conversion layer 2 has a wavelength conversion section 3 and a transparent section 4. The wavelength conversion section 3 and the transparent section 4 are sections divided in a direction orthogonal to or intersecting with the light extraction direction from the light emitting element 1, in the illustrated example, the surface direction of the wavelength conversion layer 2.

波長変換区画3は、発光素子1から発せられる光の波長を変換する波長変換物質を含有する。波長変換物質としては、発光素子1から発せられる光を吸収してその光とは異なる波長の光を発する蛍光体等を用いることができる。この波長変換物質としては、発光素子1から発せられる光の波長や、発光装置Aに求められる発光の色等に応じて適宜選択されるものであるが、例えば発光素子1として発光ピーク波長が450から470nm付近である青色LEDを用いる場合には、セリウムを付活したイットリウム・アルミニウム・ガーネット系蛍光体(YAG:Ce)を用いて黄色の発光を生じさせたり、前記YAG:Ceとユーロピウムを付活した硫化カルシウム蛍光体(CaS:Eu)を用いて赤色の発光を生じさせたりすることができ、また発光素子1として発光ピーク波長が365〜410nm付近である近紫外−紫色LEDを用いる場合にはBaMgAl10017Eu(BAM)を用いて青色の発光を生じさせたり、ZnS:Cu,Alを用いて緑色の発光を生じさせたり、Y22S:Euを用いて赤色の発光を生じさせたりすることができる。また、複数の波長変換材料を用いる場合には、波長変換区画3をそれら複数の波長変換材料を混合したもので形成しても良く、また波長変換材料の種類や含有量の異なる複数種の波長変換区画3を併設しても良い。 The wavelength conversion section 3 contains a wavelength conversion substance that converts the wavelength of light emitted from the light emitting element 1. As the wavelength converting substance, a phosphor or the like that absorbs light emitted from the light emitting element 1 and emits light having a wavelength different from the light can be used. The wavelength converting substance is appropriately selected according to the wavelength of light emitted from the light emitting element 1 or the color of light emission required for the light emitting device A. For example, the light emitting element 1 has an emission peak wavelength of 450. In the case of using a blue LED having a wavelength of about 470 nm, yellow light emission is generated using yttrium / aluminum / garnet phosphor (YAG: Ce) activated with cerium, or the YAG: Ce and europium are added. When an activated calcium sulfide phosphor (CaS: Eu) is used, red light emission can be generated, and when the near-ultraviolet-violet LED having an emission peak wavelength of about 365 to 410 nm is used as the light-emitting element 1 Produces blue light emission using BaMgAl10017Eu (BAM) or green light emission using ZnS: Cu, Al. Or causing, Y 2 O 2 S: with Eu or can cause red emission. When a plurality of wavelength conversion materials are used, the wavelength conversion section 3 may be formed of a mixture of the plurality of wavelength conversion materials, and a plurality of wavelengths having different types and contents of wavelength conversion materials. A conversion section 3 may be provided.

一方、透明区画4は、発光素子1から発せられる光が透過可能であり、且つ波長変換物質を含まないか、或いは波長変換物質を含む場合でもその含有量が波長変換区画3よりも少ないものである。   On the other hand, the transparent section 4 is capable of transmitting light emitted from the light emitting element 1 and does not include a wavelength conversion substance, or even when it includes a wavelength conversion substance, its content is less than that of the wavelength conversion section 3. is there.

上記の波長変換区画3は、波長変換物質を含む波長変換相5にて構成することができる。波長変換相5は、波長変換物質のみで構成しても良く、また発光素子1から発せられる光が透過可能な母相中に波長変換物質を分散させて構成しても良い。前記母相としては、例えばガラスや、エポキシ樹脂、シリコーン樹脂、シリコーンゴム、アクリル樹脂等のような透明樹脂の成形体を挙げることができる。   Said wavelength conversion division 3 can be comprised in the wavelength conversion phase 5 containing a wavelength conversion substance. The wavelength conversion phase 5 may be composed of only the wavelength conversion material, or may be configured by dispersing the wavelength conversion material in a matrix that can transmit light emitted from the light emitting element 1. Examples of the parent phase include a molded body of transparent resin such as glass, epoxy resin, silicone resin, silicone rubber, and acrylic resin.

また、この波長変換区画3は、上記のような波長変換相5のみで構成しても良く、またこの波長変換相5と透明相6とを、発光素子1からの光の取り出し方向に積層して構成しても良い。ここでいう透明相6とは、発光素子1から発せられる光を透過可能であり、且つ波長変換物質を含まないか、或いは波長変換相5よりも波長変換物質の含有量が少ない相である。前記透明相6は、例えばガラスや、エポキシ樹脂、シリコーン樹脂、シリコーンゴム、アクリル樹脂等のような透明樹脂の成形体にて形成することができる。   Further, the wavelength conversion section 3 may be composed of only the wavelength conversion phase 5 as described above, and the wavelength conversion phase 5 and the transparent phase 6 are laminated in the light extraction direction from the light emitting element 1. May be configured. The transparent phase 6 here is a phase that can transmit the light emitted from the light emitting element 1 and does not contain the wavelength conversion substance or has a smaller content of the wavelength conversion substance than the wavelength conversion phase 5. The transparent phase 6 can be formed of a molded body of transparent resin such as glass, epoxy resin, silicone resin, silicone rubber, acrylic resin, or the like.

波長変換区画3や波長変換相5における波長変換物質の含有量は、使用される波長変換物質の変換効率や発光色等に応じて変動するため、一概に規定できないが、例えば発光素子1として青色LEDを用い、波長変換物質としてYAG:Ce蛍光体を用いる場合には、波長変換層2の厚みを0.5mmとした場合、波長変換層2における波長変換区画3での波長変換物質の含有量の平均が好ましくは20〜40質量%の範囲となるように調整するものである。   The content of the wavelength conversion substance in the wavelength conversion section 3 and the wavelength conversion phase 5 varies depending on the conversion efficiency, emission color, etc. of the wavelength conversion substance used, and thus cannot be defined unconditionally. When using an LED and using a YAG: Ce phosphor as the wavelength conversion material, the content of the wavelength conversion material in the wavelength conversion section 3 in the wavelength conversion layer 2 when the thickness of the wavelength conversion layer 2 is 0.5 mm The average is preferably adjusted to be in the range of 20 to 40% by mass.

また、透明区画4は波長変換物質を含有させないことが好ましいが、これが波長変換物質を含有する場合には、透明区画4における波長変換物質の、発光素子1からの光の取り出し方向への投影面積当たりの含有量が、波長変換区画3における含有量の50%以下であることが好ましい。このとき、波長変換区画3として波長変換物質の含有量が異なる複数種のものが設けられている場合には、その含有量の平均値を基準としてその50%以下となることが好ましい。   Moreover, it is preferable that the transparent section 4 does not contain a wavelength converting substance. However, when the transparent section 4 contains a wavelength converting substance, the projected area of the wavelength converting substance in the transparent section 4 in the light extraction direction from the light emitting element 1. The hit content is preferably 50% or less of the content in the wavelength conversion section 3. At this time, in the case where a plurality of types having different wavelength conversion substance contents are provided as the wavelength conversion section 3, it is preferably 50% or less based on the average value of the contents.

また、透明相6についても波長変換物質を含有させないことが好ましいが、これが波長変換物質を含有する場合には、透明相6における波長変換物質の体積あたりの含有量が、波長変換相5における含有量の50%以下であることが好ましい。このとき、波長変換相5として波長変換物質の含有量が異なる複数種のものを設ける場合には、その含有量の平均値を基準としてその50%以下となることが好ましい。   Further, it is preferable that the transparent phase 6 does not contain a wavelength converting substance. However, when the transparent phase 6 contains a wavelength converting substance, the content per volume of the wavelength converting substance in the transparent phase 6 is contained in the wavelength converting phase 5. The amount is preferably 50% or less. At this time, when a plurality of types having different wavelength conversion substance contents are provided as the wavelength conversion phase 5, it is preferably 50% or less based on the average value of the contents.

また、上記透明区画4は、上記透明相6のみで構成することができる。   Further, the transparent section 4 can be composed of only the transparent phase 6.

このように波長変換層2を波長変換区画3と透明区画4とで構成すると、発光素子1から発せられる光が波長変換層2を介して外部に取り出されるに際して、前記光が波長変換層2を透過する際に、その一部が波長変換区画3を透過し、更にそのうちの一部が波長変換物質により波長変換されて外部に取り出される。また前記光の他の一部は透明区画4を透過し、或いは透明区画4を経由して透明区画4と波長変換区画3との界面から波長変換区画3へ入射された後に、外部に取り出される。これにより波長変換層2を透過した後の光には、波長変換物質により波長変換がなされたものが含まれることとなり、発光素子1の発光色とは異なる色合いの光を発光装置Aから外部に発することができる。   When the wavelength conversion layer 2 is configured by the wavelength conversion section 3 and the transparent section 4 as described above, when the light emitted from the light emitting element 1 is extracted to the outside through the wavelength conversion layer 2, the light passes through the wavelength conversion layer 2. At the time of transmission, a part of the light is transmitted through the wavelength conversion section 3, and a part of the light is converted by the wavelength conversion material and taken out to the outside. The other part of the light passes through the transparent section 4 or is incident on the wavelength conversion section 3 from the interface between the transparent section 4 and the wavelength conversion section 3 via the transparent section 4 and then extracted outside. . As a result, the light that has been transmitted through the wavelength conversion layer 2 includes light that has been wavelength-converted by the wavelength conversion substance, and light having a color different from the light emission color of the light-emitting element 1 is emitted from the light-emitting device A to the outside. Can be emitted.

このとき、透明区画4を透過する光は波長変換区画3を透過する場合よりも波長変換物質による散乱が生じにくく、特に透明区画4に波長変換物質が含まれていない場合には波長変換物質による散乱が生じなくなり、このため、波長変換層2の全体に亘って波長変換物質が分散されている場合と比較して、波長変換層2における光の散乱を低減することができる。すなわち、波長変換区画3を設けることで発光色の色合いを変更すると共に、透明区画4を設けることで波長変換層2における光の透過量を確保することができ、これにより発光装置Aからの光の取り出し効率を向上することができるものである。   At this time, the light transmitted through the transparent section 4 is less likely to be scattered by the wavelength converting material than when transmitted through the wavelength converting section 3, and particularly when the transparent section 4 contains no wavelength converting substance, the light is transmitted by the wavelength converting substance. As a result, scattering does not occur, and light scattering in the wavelength conversion layer 2 can be reduced as compared with the case where the wavelength conversion material is dispersed throughout the wavelength conversion layer 2. That is, by changing the hue of the emission color by providing the wavelength conversion section 3, it is possible to secure the amount of light transmitted through the wavelength conversion layer 2 by providing the transparent section 4. It is possible to improve the extraction efficiency.

以下、更に具体的な実施形態について説明する。   Hereinafter, more specific embodiments will be described.

図1(b)(c)に示す実施形態では、波長変換相5のみから形成されている複数の波長変換部材13と、透明相6のみから形成されている複数の透明部材14とを、それぞれ平面視矩形状(方形状)の板状体にて形成し、これらの部材の端面同士を接合することで、波長変換層2を形成している。これにより、波長変換部材13にて波長変換相5のみから構成される波長変換区画3が形成されると共に、透明部材14にて透明相6のみから構成される透明区画4が形成され、且つこの波長変換区画3と透明区画4とが平面状に配列している。このとき波長変換部材13と透明部材14とを同一形状に形成することで、波長変換区画3と透明区画4の割合が所望のものとなるように適宜のレイアウトで配列して波長変換層2を形成することができる。例えば波長変換区画3と透明区画4とを市松模様状に配列し、又はこれより更に波長変換区画3或いは透明区画4の割合を低減したりすることができる。   In the embodiment shown in FIGS. 1B and 1C, a plurality of wavelength conversion members 13 formed only from the wavelength conversion phase 5 and a plurality of transparent members 14 formed only from the transparent phase 6 are respectively provided. The wavelength conversion layer 2 is formed by forming a planar (rectangular) plate-like body in plan view and joining the end faces of these members. As a result, the wavelength conversion section 13 composed only of the wavelength conversion phase 5 is formed in the wavelength conversion member 13, and the transparent section 4 composed only of the transparent phase 6 is formed in the transparent member 14, and this The wavelength conversion section 3 and the transparent section 4 are arranged in a planar shape. At this time, by forming the wavelength conversion member 13 and the transparent member 14 in the same shape, the wavelength conversion layer 2 is arranged in an appropriate layout so that the ratio of the wavelength conversion section 3 and the transparent section 4 becomes desired. Can be formed. For example, the wavelength conversion section 3 and the transparent section 4 can be arranged in a checkered pattern, or the ratio of the wavelength conversion section 3 or the transparent section 4 can be further reduced.

本実施形態において、波長変換部材13及び波長変換区画3を構成する波長変換相5は例えばガラスや透明樹脂などの母相に波長変換物質を分散させて形成されている。また、透明部材14及び透明区画4を構成する透明相6は例えばガラスや透明樹脂で形成され、或いはこれに波長変換相5よりも少ない含有量で波長変換物質が分散して含有されている。   In the present embodiment, the wavelength conversion phase 5 constituting the wavelength conversion member 13 and the wavelength conversion section 3 is formed by dispersing a wavelength conversion substance in a matrix such as glass or transparent resin. Moreover, the transparent phase 6 which comprises the transparent member 14 and the transparent division 4 is formed, for example with glass or transparent resin, or the wavelength conversion substance is disperse | distributed and contained by this in less content than the wavelength conversion phase 5.

図2(a)(b)に示す実施形態では、透明相6のみから形成されている平板状の透明部材14に対して、波長変換相5のみにて形成されている複数の波長変換部材13を部分的に積層して接合することで、波長変換層2を形成している。波長変換部材13及び透明部材14としては、図1(b)(c)に示す実施形態と同様の材質にて形成されるものを用いることができる。このとき、波長変換層2における透明部材14に波長変換部材13を積層している区画が、透明相6と波長変換相5とが積層して構成される波長変換区画3として形成され、また波長変換部材13を積層していない区画が透明相6のみで構成された透明区画4として形成される。   In the embodiment shown in FIGS. 2 (a) and 2 (b), a plurality of wavelength conversion members 13 formed only of the wavelength conversion phase 5 with respect to the flat transparent member 14 formed of only the transparent phase 6. Are partially laminated and joined to form the wavelength conversion layer 2. As the wavelength conversion member 13 and the transparent member 14, those formed of the same material as the embodiment shown in FIGS. 1B and 1C can be used. At this time, the section in which the wavelength conversion member 13 is laminated on the transparent member 14 in the wavelength conversion layer 2 is formed as the wavelength conversion section 3 configured by laminating the transparent phase 6 and the wavelength conversion phase 5, and the wavelength A section where the conversion member 13 is not laminated is formed as a transparent section 4 composed of only the transparent phase 6.

このような波長変換層2を形成する場合には、例えば透明部材14に対し、平面視矩形状(方形状)の板状体にて形成された複数の波長変換部材13を、波長変換区画3と透明区画4との割合が所望のものとなるように適宜のレイアウトで配列して接合することができる。例えば図示のように市松模様状に配列して透明部材14に接合することができ、或いはこれよりも更に波長変換部材13の割合を増大させたり低減させたりすることができる。   In the case of forming such a wavelength conversion layer 2, for example, a plurality of wavelength conversion members 13 formed of a plate-like body having a rectangular shape (square shape) in plan view with respect to the transparent member 14 are replaced with the wavelength conversion section 3. And the transparent sections 4 can be arranged and joined in an appropriate layout so that the ratio between them and the transparent section 4 becomes a desired one. For example, as shown in the figure, they can be arranged in a checkered pattern and bonded to the transparent member 14, or the ratio of the wavelength conversion member 13 can be further increased or decreased.

また、図1(b)(c)に示す実施形態のように各部材の端面同士を接合する場合と比較して、図2に示すように透明部材14と波長変換部材13とを積層するように接合すると、部材同士の接合作業が容易なものとなり、生産性が向上するものである。   Moreover, as shown in FIG. 2, the transparent member 14 and the wavelength conversion member 13 are laminated as compared with the case where the end faces of the members are joined to each other as in the embodiment shown in FIGS. Joining to each other facilitates the joining work between the members and improves productivity.

図3(a)(b)及び図4(a)(b)に示す実施形態では、透明相6のみにて構成される平板状の透明部材14(母基材7)に複数の凹部8を形成し、この凹部8内に波長変換物質を充填することで、波長変換層2を形成している。母基材7としては、既述の実施形態における透明部材14と同様の材質のものを用いることができる。このとき、波長変換層2における凹部8が形成されていない区画、すなわち波長変換物質が充填されていない区画が、透明相6のみで構成される透明区画4として形成される。また凹部8が形成された区画では、凹部8に充填された波長変換物質にて波長変換相5が形成され、これにより波長変換相5と透明相6とが積層して構成される波長変換区画3が形成される。   In the embodiment shown in FIGS. 3A and 3B and FIGS. 4A and 4B, a plurality of recesses 8 are formed in a flat transparent member 14 (base material 7) composed of only the transparent phase 6. The wavelength conversion layer 2 is formed by filling the recess 8 with a wavelength conversion substance. As the base material 7, the same material as the transparent member 14 in the above-described embodiment can be used. At this time, a section in the wavelength conversion layer 2 where the concave portion 8 is not formed, that is, a section not filled with the wavelength conversion substance, is formed as the transparent section 4 including only the transparent phase 6. Further, in the section where the recess 8 is formed, the wavelength conversion phase 5 is formed by the wavelength conversion material filled in the recess 8, and thereby the wavelength conversion section configured by laminating the wavelength conversion phase 5 and the transparent phase 6. 3 is formed.

本実施形態において波長変換層2を形成する場合には、波長変換区画3と透明区画4との割合が所望のものとなるように、母基材7に対して凹部8を適宜のレイアウトで形成して、この凹部8を形成した箇所に波長変換相5を適宜のレイアウトで形成することができる。例えば凹部8及びこの凹部8に形成される波長変換相5を、図3に示すように母基材7に対して縦横複数列のマトリクス状に形成したり、図4に示すように並列な複数列の縞状に形成したりすることができる。   When the wavelength conversion layer 2 is formed in the present embodiment, the concave portions 8 are formed in an appropriate layout with respect to the base material 7 so that the ratio of the wavelength conversion section 3 and the transparent section 4 is a desired one. Thus, the wavelength conversion phase 5 can be formed in an appropriate layout at the location where the recess 8 is formed. For example, the recesses 8 and the wavelength conversion phases 5 formed in the recesses 8 are formed in a matrix of a plurality of rows and columns with respect to the base material 7 as shown in FIG. 3, or as shown in FIG. It can be formed in a striped pattern.

このようにして形成される波長変換層2では、凹部8が形成されている箇所において波長変換相5とその一面側に積層されている透明相6によって構成される波長変換区画3が形成され、また凹部8が形成されていない箇所において透明相6のみで構成される透明区画4が形成される。   In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on the one surface side is formed at the portion where the recess 8 is formed, Moreover, the transparent division 4 comprised only by the transparent phase 6 is formed in the location in which the recessed part 8 is not formed.

このようにすると、波長変換相5は凹部8に波長変換物質を充填するだけで形成することができ、生産性が向上するものである。   In this way, the wavelength conversion phase 5 can be formed simply by filling the concave portion 8 with the wavelength conversion substance, thereby improving productivity.

また、このように母基材7の凹部8に波長変換物質を充填して波長変換相5を形成する場合には、前記は母基材7の凹部8が開口している側の一面に、透明相6のみで構成される別の透明部材14(蓋部材9)を積層して設けるなどして、この蓋部材9にて前記凹部8の開口に露出している波長変換相5(波長変換材料)の露出部分を閉塞することができる。例えば図5(a)(b)に示す例では、図3に示すように波長変換相5をマトリクス状に形成したものにおいて、波長変換相5が設けられた凹部8を有する母基材7の、波長変換相5が露出する一面の全面に亘り蓋部材9を積層して接合することにより、前記波長変換相5の露出部分を閉塞している。このようにして形成される波長変換層2では、凹部8が形成されている箇所において波長変換相5とその両側に積層された透明相6によって構成される波長変換区画3が形成され、また凹部8が形成されていない箇所において透明相6のみで構成される透明区画4が形成される。   In addition, when the wavelength conversion phase 5 is formed by filling the concave portion 8 of the base material 7 with the wavelength conversion substance in this way, the above is provided on one surface of the base material 7 where the concave portion 8 is open. The wavelength conversion phase 5 (wavelength conversion) exposed to the opening of the concave portion 8 by this lid member 9 is provided by laminating another transparent member 14 (lid member 9) composed of only the transparent phase 6. The exposed portion of the material can be occluded. For example, in the example shown in FIGS. 5 (a) and 5 (b), in the case where the wavelength conversion phase 5 is formed in a matrix as shown in FIG. 3, the base material 7 having the recesses 8 provided with the wavelength conversion phase 5 is provided. The exposed portion of the wavelength conversion phase 5 is blocked by laminating and bonding the lid member 9 over the entire surface where the wavelength conversion phase 5 is exposed. In the wavelength conversion layer 2 formed in this manner, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on both sides thereof is formed at the portion where the recess 8 is formed, and the recess A transparent section 4 composed only of the transparent phase 6 is formed at a location where 8 is not formed.

このようにすると、蓋部材9により、凹部8に充填した波長変換物質の飛散や漏洩を蓋部材9により防止することができ、またそのために生産時の歩留まりを向上することができるものである。   If it does in this way, the lid member 9 can prevent the wavelength conversion substance filled in the concave portion 8 from being scattered or leaked by the lid member 9, and for this reason, the yield during production can be improved.

また、図3(a)(b)及び図4(a)(b)に示すような実施形態において、上記凹部8に代えて母基材7を貫通する貫通部を母基材7に形成し、この貫通部内に波長変換物質を充填することで、波長変換層2を形成することもできる。この場合、凹部8に代えて貫通部を形成する以外は、図3,4に示すものと同様にして波長変換層2を形成することができる。   Further, in the embodiment as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, a through portion that penetrates the base material 7 is formed in the base material 7 instead of the recess 8. The wavelength conversion layer 2 can also be formed by filling the penetrating portion with a wavelength conversion substance. In this case, the wavelength conversion layer 2 can be formed in the same manner as shown in FIGS. 3 and 4 except that a through-hole is formed instead of the recess 8.

このようにして形成される波長変換層2では、貫通部が形成されている箇所において波長変換相5のみによって構成される波長変換区画3が形成され、また貫通部が形成されていない箇所において透明相6のみで構成される透明相6が形成される。   In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted only by the wavelength conversion phase 5 is formed in the portion where the penetrating portion is formed, and transparent in the portion where the penetrating portion is not formed. A transparent phase 6 composed only of the phase 6 is formed.

このようにしても、波長変換相5は貫通部に波長変換物質を充填するだけで形成することができ、生産性が向上するものである。   Even in this case, the wavelength conversion phase 5 can be formed only by filling the penetrating portion with the wavelength conversion substance, and the productivity is improved.

また、このように母基材7の貫通部に波長変換物質を充填して波長変換相5を形成する場合には、前記母基材7の貫通部が開口している両面に、それぞれ透明相6のみで構成される別の透明部材14(蓋部材9)を積層して設けるなどして、この蓋部材9にて前記貫通部の開口に露出している波長変換相5(波長変換物質)の露出部分を閉塞することができる。例えば、波長変換相5が設けられた貫通部を有する母基材7の、波長変換相5が露出する両面の全面に亘りそれぞれ蓋部材9を積層して接合することにより、前記波長変換相5の露出部分を閉塞することができる。このようにして形成される波長変換層2では、貫通部が形成されている箇所において波長変換相5とその両側に積層された透明相6によって構成される波長変換区画3が形成され、また貫通部が形成されていない箇所において透明相6のみで構成される透明区画4が形成される。   Further, when the wavelength conversion phase 5 is formed by filling the penetrating portion of the base material 7 with the wavelength conversion substance, the transparent phase is respectively formed on both surfaces where the penetrating portion of the base material 7 is open. The wavelength conversion phase 5 (wavelength conversion substance) exposed at the opening of the penetrating portion at the lid member 9 by providing another transparent member 14 (lid member 9) composed of only 6 It is possible to close the exposed portion of the. For example, the wavelength conversion phase 5 is obtained by laminating and bonding the cover members 9 over the entire surfaces of both surfaces where the wavelength conversion phase 5 is exposed, of the base material 7 having a penetrating portion provided with the wavelength conversion phase 5. It is possible to close the exposed portion of the. In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on both sides thereof is formed at the portion where the penetrating portion is formed. A transparent section 4 composed only of the transparent phase 6 is formed at a portion where no part is formed.

このようにしても、図5に示す場合と同様に、貫通部に充填した波長変換物質の飛散や漏洩を蓋部材9にて防止することができ、またそのために生産時の歩留まりを向上することができるものである。   Even in this case, similarly to the case shown in FIG. 5, scattering and leakage of the wavelength conversion substance filled in the penetrating portion can be prevented by the lid member 9, and for that reason, the yield during production can be improved. Is something that can be done.

ところで、上記各実施形態のように波長変換区画3と透明区画4とを有する波長変換層2を形成する場合には、発光装置Aからの発光は、波長変換区画3を透過したものと透明区画4を透過したものとが混在することにより、発光素子1から発せられる光とは異なる色合いとなるものであるが、この発光が色むらなく均一になされるためには、波長変換層2の全体に亘って波長変換区画3を均一に分散させて形成することが好ましい。また、色むらを低減するためには、特に波長変換層2に形成される波長変換区画3の寸法を、好ましくはその最小幅寸法が0.1mm以下となるようにするものである。このようにすると、微細な波長変換区画3が波長変換層2に分散することから、波長変換区画3を透過することにより波長変換された光が発光装置Aからの発光中に均一に分散して混在することとなり、色むらの発生が著しく低減されるものである。前記波長変換区画3の寸法の下限は特に制限されず、波長変換区画3が形成可能な寸法であれば良いため、実質的には10nmとなる。   By the way, when the wavelength conversion layer 2 having the wavelength conversion section 3 and the transparent section 4 is formed as in each of the above embodiments, the light emitted from the light emitting device A is transmitted through the wavelength conversion section 3 and the transparent section. 4 is mixed with the light transmitted from the light-emitting element 1, so that the light emitted from the light-emitting element 1 is different from the light emitted from the light-emitting element 1. It is preferable that the wavelength conversion section 3 is uniformly dispersed over the entire area. In order to reduce color unevenness, the size of the wavelength conversion section 3 formed in the wavelength conversion layer 2 is preferably set such that the minimum width is preferably 0.1 mm or less. In this way, since the fine wavelength conversion section 3 is dispersed in the wavelength conversion layer 2, the light that has been wavelength-converted by being transmitted through the wavelength conversion section 3 is uniformly dispersed during light emission from the light emitting device A. As a result, color unevenness is remarkably reduced. The lower limit of the dimension of the wavelength conversion section 3 is not particularly limited, and may be any dimension that allows the wavelength conversion section 3 to be formed.

また、波長変換層2における、波長変換区画3と透明区画4の割合も、所望の発光色が得られるように適宜調整されるが、好ましくは波長変換区画3と透明区画4との、発光素子1からの光の取り出し方向への投影面積の比が5:1〜1:5の範囲となるようにする。このようにすることで、透明区画4を透過する光、すなわち波長変換物質による散乱を受けずに波長変換層2を透過する光の光量を十分に確保して発光装置Aからの発光光量を十分に高く維持することができ、且つこの範囲で波長変換区画3と透明区画4との割合を変化させて発光色の調整をすることができるものである。すなわち、透明区画4の割合を前記範囲とすることで十分な発光光量を確保することができ、且つ、波長変換区画3の割合を前記範囲とすることで発光素子1から発せられる光が波長変換層2を透過する際にその色合いの変換を十分になすことができるものである。   Further, the ratio of the wavelength conversion section 3 and the transparent section 4 in the wavelength conversion layer 2 is also appropriately adjusted so as to obtain a desired light emission color. Preferably, the light emitting elements of the wavelength conversion section 3 and the transparent section 4 are used. The ratio of the projected areas in the light extraction direction from 1 is set to be in the range of 5: 1 to 1: 5. By doing in this way, sufficient light quantity of the light which permeate | transmits the transparent division 4, ie, the light which permeate | transmits the wavelength conversion layer 2 without receiving the scattering by a wavelength conversion substance, and sufficient light emission quantity from the light-emitting device A is ensured. In this range, the emission color can be adjusted by changing the ratio of the wavelength conversion section 3 and the transparent section 4. That is, a sufficient amount of emitted light can be secured by setting the ratio of the transparent section 4 in the above range, and the light emitted from the light emitting element 1 can be converted in wavelength by setting the ratio of the wavelength conversion section 3 in the above range. When passing through the layer 2, the hue can be sufficiently converted.

尚、図示された本発明の実施形態における波長変換層2は、全体として平面状に形成されているが、曲面状等の適宜の形状に形成することもできる。   The wavelength conversion layer 2 in the illustrated embodiment of the present invention is formed in a planar shape as a whole, but may be formed in an appropriate shape such as a curved surface.

(a)は発光装置の基本構成の一例を示す断面図、(b)は本発明の実施の形態の一例を示すものであり、前記発光装置における波長変換層を示す断面図、(c)は前記波長変換層の平面図である。(A) is sectional drawing which shows an example of the basic composition of a light-emitting device, (b) shows an example of embodiment of this invention, sectional drawing which shows the wavelength conversion layer in the said light-emitting device, (c) is It is a top view of the said wavelength conversion layer. 本発明の実施の形態の他例を示すものであり、(a)は図1(a)に示される発光装置における波長変換層を示す断面図、(b)は前記波長変換層の平面図である。FIG. 8 shows another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. is there. 本発明の実施の形態の更に他例を示すものであり、(a)は図1(a)に示される発光装置における波長変換層を示す断面図、(b)は前記波長変換層の平面図である。FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is. 本発明の実施の形態の更に他例を示すものであり、(a)は図1(a)に示される発光装置における波長変換層を示す断面図、(b)は前記波長変換層の平面図である。FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is. 本発明の実施の形態の更に他例を示すものであり、(a)は図1(a)に示される発光装置における波長変換層を示す断面図、(b)は前記波長変換層の平面図である。FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is.

符号の説明Explanation of symbols

A 発光装置
1 発光素子
2 波長変換層
3 波長変換区画
4 透明区画
5 波長変換相
6 透明相
7 母基材
8 凹部
9 蓋部材
A light emitting device 1 light emitting element 2 wavelength conversion layer 3 wavelength conversion section 4 transparent section 5 wavelength conversion phase 6 transparent phase 7 base material 8 recess 9 lid member

Claims (6)

発光素子と、この発光素子から発せられる光を波長変換する波長変換物質を含有する波長変換層とを備えた発光装置において、前記波長変換層が、波長変換物質を含有する波長変換区画と、前記波長変換区画よりも波長変換物質の含有量が少ない透明区画とを有することを特徴とする発光装置。   In a light-emitting device including a light-emitting element and a wavelength conversion layer containing a wavelength conversion substance for wavelength-converting light emitted from the light-emitting element, the wavelength conversion layer includes a wavelength conversion section containing a wavelength conversion substance, and A light emitting device comprising: a transparent section having a smaller content of the wavelength converting substance than the wavelength converting section. 上記波長変換区画が、波長変換物質を含有する波長変換相と、この波長変換相よりも波長変換物質の含有量が少ない透明相とを積層して形成されると共に、上記透明区画が透明相のみで形成されていることを特徴とする請求項1に記載の発光装置。   The wavelength conversion section is formed by laminating a wavelength conversion phase containing a wavelength conversion substance and a transparent phase containing less wavelength conversion material than the wavelength conversion phase, and the transparent section is only a transparent phase. The light-emitting device according to claim 1, wherein the light-emitting device is formed by: 上記波長変換区画が波長変換物質を含有する波長変換相を含み、且つ前記波長変換相が、この波長変換相よりも波長変換物質の含有量が少ない透明相から構成される母基材に設けられた凹部又は貫通部に波長変換物質を充填して形成されたものであることを特徴とする請求項1又は2に記載の発光装置。   The wavelength conversion section includes a wavelength conversion phase containing a wavelength conversion substance, and the wavelength conversion phase is provided on a mother base composed of a transparent phase having a smaller wavelength conversion substance content than the wavelength conversion phase. The light emitting device according to claim 1, wherein the concave portion or the through portion is filled with a wavelength converting substance. 上記母基材における上記凹部開口での波長変換相の露出部分が、透明相にて構成される蓋部材にて閉塞されていることを特徴とする請求項3に記載の発光装置。   The light emitting device according to claim 3, wherein an exposed portion of the wavelength conversion phase at the recess opening in the base material is closed by a lid member formed of a transparent phase. 上記波長変換区画の最小幅寸法が0.1mm以下であることを特徴とする請求項1乃至4のいずれかに記載の発光装置。   The light emitting device according to any one of claims 1 to 4, wherein a minimum width dimension of the wavelength conversion section is 0.1 mm or less. 上記波長変換層の、波長変換区画と透明区画との、発光素子からの光の取り出し方向への投影面積の比が5:1〜1:5の範囲であることを特徴とする請求項1乃至5のいずれかに記載の発光装置。   The ratio of the projected area of the wavelength conversion layer to the light extraction direction of the light from the light emitting element between the wavelength conversion section and the transparent section is in the range of 5: 1 to 1: 5. The light emitting device according to any one of 5.
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