JP2002226846A - Illuminating fluorescent substance, light-emitting diode using the same illuminating fluorescent substance and method for coating fluorescent substance - Google Patents
Illuminating fluorescent substance, light-emitting diode using the same illuminating fluorescent substance and method for coating fluorescent substanceInfo
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- JP2002226846A JP2002226846A JP2001029093A JP2001029093A JP2002226846A JP 2002226846 A JP2002226846 A JP 2002226846A JP 2001029093 A JP2001029093 A JP 2001029093A JP 2001029093 A JP2001029093 A JP 2001029093A JP 2002226846 A JP2002226846 A JP 2002226846A
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- phosphor
- light
- fluorescent substance
- blue
- wavelength
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Luminescent Compositions (AREA)
- Led Device Packages (AREA)
- Led Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、照明用蛍光体、こ
の照明用蛍光体を用いた発光ダイオード、および蛍光体
の塗布方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor for lighting, a light emitting diode using the phosphor for lighting, and a coating method of the phosphor.
【０００２】[0002]
【従来の技術】近時、高効率でかつ長寿命である発光ダ
イオードを蛍光ランプ等の一般照明用白色光源の代替光
源として用いることが提案されている。2. Description of the Related Art Recently, it has been proposed to use a light emitting diode having high efficiency and long life as an alternative light source for a white light source for general illumination such as a fluorescent lamp.
【０００３】従来の白色発光ダイオードとしては、例え
ば青色発光域（４００ｎｍ〜５３０ｎｍ）にピーク波長
をもつＬＥＤチップ（発光素子）と、その発光の一部を
吸収し黄色系に発光する蛍光体とを組み合わせたものが
知られている（特開平１１−３１８４５号公報や特開平
１１−４０８５８号公報等）。As a conventional white light emitting diode, for example, an LED chip (light emitting element) having a peak wavelength in a blue light emitting region (400 nm to 530 nm) and a phosphor which absorbs a part of the light emission and emits yellow light are used. Combinations are known (JP-A-11-31845, JP-A-11-40858, etc.).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の白色発光ダイオードでは、青色光および黄色
光のみで白色光を実現しているため、赤味成分の不足し
た白色となり、一般照明用の白色光源の代替光源として
は適していないという問題があった。However, in such a conventional white light emitting diode, since white light is realized only with blue light and yellow light, the white light lacks a red component and becomes white for general lighting. There is a problem that it is not suitable as a substitute for a white light source.
【０００５】また、このような発光ダイオードに用いる
蛍光体として、一般的な蛍光ランプ用の蛍光体を使用し
た場合、このような蛍光ランプ用の蛍光体はもともと水
銀から発生する２５４ｎｍをピーク波長とする紫外線に
よって励起効率が最大となるように構成されているた
め、波長４００ｎｍ〜５３０ｎｍの発光によって励起さ
せて発光させても、発光強度が著しく弱く、場合によっ
て発光しないという問題があった。When a phosphor for a general fluorescent lamp is used as a phosphor for such a light emitting diode, the phosphor for such a fluorescent lamp originally has a peak wavelength of 254 nm generated from mercury. Since the excitation efficiency is maximized by the ultraviolet light, even when the light is excited by the light having a wavelength of 400 nm to 530 nm to emit light, there is a problem that the light emission intensity is extremely weak and the light is not emitted in some cases.
【０００６】本発明は、このような問題を解決するため
になされたものであり、励起光源として、特に波長３４
０ｎｍ〜３８０ｎｍの近紫外光を発する光源を用いた場
合に、赤色、緑色、青色の三原色の各成分のバランスが
取れた一般照明用の白色光源の白色光とほぼ同様の白色
光であり、かつ発光強度の強い発光を得ることができる
照明用蛍光体を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem.
When a light source that emits near-ultraviolet light of 0 nm to 380 nm is used, the white light is substantially the same as the white light of a white light source for general illumination in which the three primary colors of red, green, and blue are balanced, and It is an object of the present invention to provide an illumination phosphor capable of obtaining light emission with high light emission intensity.
【０００７】また、本発明は、波長３４０ｎｍ〜３８０
ｎｍの近紫外光を発する発光素子を有する発光ダイオー
ドであって、赤色、緑色、青色の三原色の各成分のバラ
ンスが取れた一般照明用の白色光源の白色光とほぼ同様
の白色光であり、かつ発光強度の強い発光を得ることが
できる発光ダイオードを提供することを目的とする。[0007] The present invention also relates to a wavelength range of 340 nm to 380.
a light-emitting diode having a light-emitting element that emits near-ultraviolet light having a wavelength of about 3 nm.Red light, green light, and white light that is substantially the same as white light of a white light source for general illumination in which the components of the three primary colors of blue are balanced; It is another object of the present invention to provide a light emitting diode capable of obtaining light emission with high light emission intensity.
【０００８】さらに、本発明は、被塗布部材、例えば発
光ダイオードの発光素子の平面部分に蛍光体膜を形成す
る際、蛍光体膜の膜厚を均一にすることができる蛍光体
の塗布方法を提供することを目的とする。Further, the present invention provides a phosphor coating method capable of making the thickness of a phosphor film uniform when a phosphor film is formed on a member to be coated, for example, a plane portion of a light emitting element of a light emitting diode. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】本発明の照明用蛍光体
は、波長３４０ｎｍ〜３８０ｎｍの近紫外光によって励
起されて白色発光する照明用蛍光体であって、ピーク波
長６２５ｎｍ〜７５０ｎｍの赤色蛍光体またはピーク波
長５７５ｎｍ〜６７５ｎｍの橙色蛍光体と、ピーク波長
５００ｎｍ〜６００ｎｍの緑色蛍光体と、ピーク波長４
００ｎｍ〜５００ｎｍの青色蛍光体とを含有している。The illumination phosphor of the present invention is an illumination phosphor which emits white light when excited by near ultraviolet light having a wavelength of 340 nm to 380 nm, and is a red phosphor having a peak wavelength of 625 nm to 750 nm. Or, an orange phosphor having a peak wavelength of 575 nm to 675 nm, a green phosphor having a peak wavelength of 500 nm to 600 nm, and a peak wavelength of 4
And a blue phosphor of 00 nm to 500 nm.
【００１０】これにより、励起光源として、波長３４０
ｎｍ〜３８０ｎｍの近紫外光を発する光源を用いた場合
に、赤色、緑色、青色の三原色の各成分のバランスが取
れた一般照明用の白色光源の白色光とほぼ同様の白色光
であり、かつ発光強度の強い発光を得ることができる。As a result, the wavelength 340 is used as the excitation light source.
When a light source that emits near-ultraviolet light of nm to 380 nm is used, the white light is substantially the same as the white light of a white light source for general illumination in which the three primary colors of red, green, and blue are balanced, and Light emission with high light emission intensity can be obtained.
【００１１】また、本発明の発光ダイオードは、波長３
４０ｎｍ〜３８０ｎｍの近紫外光を発する発光素子と、
この発光素子から発せられる光によって励起されて発光
する請求項１〜請求項７のいずれかに記載の照明用蛍光
体とを有している。The light emitting diode of the present invention has a wavelength of 3
A light-emitting element that emits near-ultraviolet light of 40 nm to 380 nm,
The illumination phosphor according to any one of claims 1 to 7, which emits light when excited by light emitted from the light emitting element.
【００１２】これにより、赤色、緑色、青色の三原色の
各成分のバランスが取れた一般照明用の白色光源の白色
光とほぼ同様の白色光であり、かつ発光強度の強い発光
を得ることができる。[0012] This makes it possible to obtain a white light having substantially the same intensity as the white light of the white light source for general illumination, in which the respective components of the three primary colors of red, green and blue are well-balanced, and of high intensity. .
【００１３】さらに、本発明の蛍光体の塗布方法は、蛍
光体を被塗布部材の平面部分に塗布する蛍光体の塗布方
法であって、前記蛍光体を含有する蛍光体懸濁液をスピ
ンコーティングによって前記被塗布部材の平面部分に塗
布する方法が用いられている。Further, the method of applying a phosphor according to the present invention is a method of applying a phosphor to a flat portion of a member to be coated, wherein the phosphor suspension containing the phosphor is spin-coated. In this method, a method of applying the liquid to the flat portion of the member to be coated is used.
【００１４】これにより、被塗布部材の平面部分に蛍光
体膜を形成する際、蛍光体膜の膜厚を均一にすることが
できる。Thus, when the phosphor film is formed on the flat portion of the member to be coated, the thickness of the phosphor film can be made uniform.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】本発明の実施の形態であるチップ型の発光
ダイオードは、図１に示すように、発光軸Ｘを含む面で
切断した断面形状が凹状の真鍮からなるベース部１と、
このベース部１の凹部２内の底面上に配置された発光素
子３と、この発光素子３等を保護するためにベース部１
の凹部２内に充填されたエポキシ樹脂やシリコーン樹脂
等からなる透明性の樹脂部材４とを備えている。As shown in FIG. 1, a chip-type light emitting diode according to an embodiment of the present invention has a base portion 1 made of brass having a concave cross section cut along a plane including a light emitting axis X;
The light emitting element 3 disposed on the bottom surface in the concave portion 2 of the base section 1 and the base section 1 for protecting the light emitting element 3 and the like.
And a transparent resin member 4 made of an epoxy resin, a silicone resin, or the like filled in the concave portion 2.
【００１７】ベース部１には、ベース部１の外部から発
光素子３に電力を供給する金と錫との合金からなる２つ
の層状の外部電極５ａ，５ｂが一体的に形成されてい
る。The base portion 1 is integrally formed with two layered external electrodes 5a and 5b made of an alloy of gold and tin for supplying power to the light emitting element 3 from outside the base portion 1.
【００１８】発光素子３は、サファイアからなる透明基
板６上に、波長３４０ｎｍ〜３８０ｎｍの近紫外光を発
する例えば窒化ガリウム系化合物半導体７と、Ｐ電極８
とが順次積層された構造をなしている。また、半導体７
にはＮ電極９が形成されている。The light emitting element 3 includes, for example, a gallium nitride-based compound semiconductor 7 that emits near ultraviolet light having a wavelength of 340 nm to 380 nm on a transparent substrate 6 made of sapphire, and a P electrode 8.
Are sequentially laminated. Semiconductor 7
Is formed with an N electrode 9.
【００１９】外部電極５ａとＰ電極８とは直接接触して
接続されている。外部電極５ｂとＮ電極９とは金属ワイ
ヤー１０を介して接続されている。The external electrode 5a and the P electrode 8 are connected in direct contact. The external electrode 5b and the N electrode 9 are connected via a metal wire 10.
【００２０】なお、発光素子３の発光波長は、半導体材
料やその組成比によって種々選択することができる。The light emission wavelength of the light emitting element 3 can be variously selected depending on the semiconductor material and its composition ratio.
【００２１】透明基板６の表面には、ピーク波長６２５
ｎｍ〜７５０ｎｍの赤色蛍光体またはピーク波長５７５
ｎｍ〜６７５ｎｍの橙色蛍光体と、ピーク波長５００ｎ
ｍ〜６００ｎｍの緑色蛍光体と、ピーク波長４００ｎｍ
〜５００ｎｍの青色蛍光体とを含有し、波長３４０ｎｍ
〜３８０ｎｍの近紫外光によって励起されて白色発光す
る蛍光体からなる蛍光体膜１１が形成されている。The surface of the transparent substrate 6 has a peak wavelength of 625
red phosphor or peak wavelength 575 nm to 750 nm
orange-phosphor with a peak wavelength of 500 nm
m-600 nm green phosphor, peak wavelength 400 nm
And a blue phosphor having a wavelength of 340 nm.
A phosphor film 11 made of a phosphor that emits white light when excited by near-ultraviolet light of about 380 nm is formed.
【００２２】赤色蛍光体には、例えば一般式ＡxＤyＯz
（ただし、ＡはＭｇ、ＣａおよびＭｎの中から選ばれる
少なくとも一種の元素、ＤはＧｅおよびＭｎの中から選
ばれる少なくとも一種の元素であり、ｘ、ｙおよびｚは
２０＜ｘ＜４０、０＜ｙ＜１５、ｚ＝１００−ｘ−ｙな
る条件を満たす数である）で表される単相の酸化物であ
り、かつ結晶構造が斜方晶であるとともに、空間群がＰ
ｂａｍである蛍光体を用いることが好ましい。The red phosphor has, for example, the general formula A x D y O z
(Where A is at least one element selected from Mg, Ca and Mn, D is at least one element selected from Ge and Mn, and x, y and z are 20 <x <40, 0 <Y <15, which is a number satisfying the condition z = 100−xy), the crystal structure is orthorhombic, and the space group is P
It is preferable to use a phosphor that is bam.
【００２３】以下、一例として赤色蛍光体（Ｍｎ，Ｃ
ａ，Ｍｎ）x（Ｇｅ，Ｍｎ）yＯzにおいて、その組成比
を種々変化させた場合の結晶構造、空間群、および波長
３７５ｎｍの近紫外光によって励起された際に発光する
発光色を調べたところ、表１に示すとおりの結果が得ら
れた。Hereinafter, as an example, a red phosphor (Mn, C
In a, Mn) x (Ge, Mn) y O z , the crystal structure, space group, and emission color of light emitted when excited by near-ultraviolet light having a wavelength of 375 nm when the composition ratio is changed variously are examined. As a result, the results shown in Table 1 were obtained.
【００２４】なお、表１の「発光色」の欄において、
「赤」はピーク波長６２５ｎｍ〜７５０ｎｍの発光を、
「紫」はピーク波長３８０ｎｍ〜３９０ｎｍの発光を、
「青紫」はピーク波長３９０ｎｍ〜４００ｎｍの発光を
それぞれ示す（以下の表についても同じ）。また、「判
定」の欄において、「○」は本発明に使用するのに適し
ていることを、「×」は本発明に使用するのに適してい
ないことをそれぞれ示す（以下の表についても同じ）。In the column of "Emission color" in Table 1,
“Red” indicates light emission with a peak wavelength of 625 nm to 750 nm,
“Purple” emits light with a peak wavelength of 380 nm to 390 nm,
"Blue purple" indicates light emission with a peak wavelength of 390 nm to 400 nm, respectively (the same applies to the following tables). In the column of “determination”, “「 ”indicates that the composition is suitable for use in the present invention, and“ × ”indicates that the composition is not suitable for use in the present invention. the same).
【００２５】[0025]
【表１】 [Table 1]
【００２６】橙色蛍光体には、例えば一般式ＧxＯyＳ
ｚ：Ｅｕ3+（ただし、ＧはＹおよびＧａの中から選ばれ
る少なくとも一種の元素であり、ｘ、ｙおよびｚは３５
＜ｘ＜４５、３５＜ｙ＜４５、ｚ＝１００−ｘ−ｙなる
条件を満たす数である）で表される単相の酸化物であ
り、かつ結晶構造が六方晶であるとともに、空間群がＰ
−３ｍである蛍光体を用いることが好ましい。The orange phosphor includes, for example, a general formula G x O y S
z: Eu 3+ (where G is at least one element selected from Y and Ga, and x, y and z are 35
<X <45, 35 <y <45, z is a number satisfying the condition of 100-xy)), and has a hexagonal crystal structure and a space group. Is P
It is preferable to use a phosphor of -3 m.
【００２７】以下、一例として橙色蛍光体（Ｙ，Ｃａ）
xＯyＳｎz：Ｅｕ3+において、その組成比を種々変化さ
せた場合の結晶構造、空間群、および波長３７５ｎｍの
近紫外光によって励起された際に発光する発光色を調べ
たところ、表２に示すとおりの結果が得られた。Hereinafter, as an example, an orange phosphor (Y, Ca)
x O y Sn z: In Eu 3+, was examined crystal structure when was varied its composition ratio, space group, and the emission color of light emission when excited by near-ultraviolet light of wavelength 375 nm, the table The result as shown in FIG. 2 was obtained.
【００２８】なお、表２の「発光色」の欄において、
「橙」はピーク波長５７５ｎｍ〜６７５ｎｍの発光を示
す。In the column of "Emission color" in Table 2,
“Orange” indicates light emission with a peak wavelength of 575 nm to 675 nm.
【００２９】[0029]
【表２】 [Table 2]
【００３０】緑色蛍光体には、例えば一般式ＬxＧｅyＯ
z：Ｍｎ2+（ただし、ＬはＧａおよびＺｎの中から選ば
れる少なくとも一種の元素であり、ｘ、ｙおよびｚは２
０＜ｘ＜３０、１０＜ｙ＜２０、ｚ＝１００−ｘ−ｙな
る条件を満たす数である）で表される単相の酸化物であ
り、かつ結晶構造が菱面晶であるとともに、空間群がＲ
−３Ｈである蛍光体を用いることが好ましい。The green phosphor includes, for example, a general formula L x Ge y O
z : Mn 2+ (where L is at least one element selected from Ga and Zn, and x, y, and z are 2
0 <x <30, 10 <y <20, z = 100-xy), and a rhombohedral crystal structure. Space group is R
It is preferable to use a phosphor that is -3H.
【００３１】以下、一例として緑色蛍光体（Ｃａ，Ｚ
ｎ）xＧｅyＯz：Ｍｎ2+において、その組成比を種々変
化させた場合の結晶構造、空間群、および波長３７５ｎ
ｍの近紫外光によって励起された際に発光する発光色を
調べたところ、表３に示すとおりの結果が得られた。Hereinafter, as an example, a green phosphor (Ca, Z)
n) In x Ge y O z : Mn 2+ , a crystal structure, a space group, and a wavelength of 375 n when its composition ratio is variously changed.
When the emission color emitted when excited by m near-ultraviolet light was examined, the results shown in Table 3 were obtained.
【００３２】なお、表３の「発光色」の欄において、
「緑」はピーク波長５００ｎｍ〜６００ｎｍの発光を、
「青緑」はピーク波長４７５ｎｍ〜５２５ｎｍの発光
を、「黄緑」はピーク波長５７５ｎｍ〜６００ｎｍの発
光をそれぞれ示す。In the column of "Emission color" in Table 3,
“Green” indicates light emission with a peak wavelength of 500 nm to 600 nm,
“Blue-green” indicates light emission with a peak wavelength of 475 nm to 525 nm, and “yellow-green” indicates light emission with a peak wavelength of 575 nm to 600 nm.
【００３３】[0033]
【表３】 [Table 3]
【００３４】青色蛍光体には、例えば一般式Ｍx（Ｐ
Ｏ4）yＣｌz：Ｅｕ2+（ただし、ＭはＳｒおよびＣａの
中から選ばれる少なくとも一種の元素であり、ｘ、ｙお
よびｚは５０＜ｘ＜６０、３０＜ｙ＜４０、ｚ＝１００
−ｘ−ｙなる条件を満たす数である）で表される単相の
酸化物であり、かつ結晶構造が六方晶であるとともに、
空間群がＰ６３／ｍである蛍光体を用いることが好まし
い。The blue phosphor has, for example, the general formula M x (P
O 4 ) y Cl z : Eu 2+ (where M is at least one element selected from Sr and Ca, x, y and z are 50 <x <60, 30 <y <40, z = 100
-X-y), and has a hexagonal crystal structure.
It is preferable to use a phosphor whose space group is P63 / m.
【００３５】以下、一例として緑色蛍光体（Ｓｒ，Ｃ
ａ）x（ＰＯ4）yＣｌz：Ｅｕ2+において、その組成比を
種々変化させた場合の結晶構造、空間群、および波長３
７５ｎｍの近紫外光によって励起された際に発光する発
光色を調べたところ、表４に示すとおりの結果が得られ
た。The green phosphor (Sr, C
a) In x (PO 4 ) y Cl z : Eu 2+ , the crystal structure, space group and wavelength 3 when the composition ratio is variously changed
When the color of light emitted when excited by near-ultraviolet light of 75 nm was examined, the results shown in Table 4 were obtained.
【００３６】なお、表４の「発光色」の欄において、
「青」はピーク波長４００ｎｍ〜５００ｎｍの発光を示
す。In the column of "Emission color" in Table 4,
“Blue” indicates light emission with a peak wavelength of 400 nm to 500 nm.
【００３７】[0037]
【表４】 [Table 4]
【００３８】上記赤色蛍光体、緑色蛍光体および青色蛍
光体をそれぞれ用いた場合では、赤色蛍光体の含有量を
重量百分率でａ（％）、緑色蛍光体の含有量を重量百分
率でｂ（％）、青色蛍光体の含有量を重量百分率でｃ
（％）とすると、５０％＜ａ＜６０％、２５％＜ｂ＜３
５％、ｃ＝１００−ａ−ｂ（％）なる関係式が満たされ
ることにより、ＣＩＥ１９３１色度図上で（ｘ，ｙ）＝
（０．２，０．２）、（ｘ，ｙ）＝（０．２，０．
４）、（ｘ，ｙ）＝（０．４５，０．２）（ｘ，ｙ）＝
（０．４５，０．４）で囲まれた領域の白色光、つまり
一般照明用の白色光源と同様の白色光を得ることができ
る。When each of the red, green, and blue phosphors is used, the content of the red phosphor is represented by a (%) by weight percentage, and the content of the green phosphor is represented by b (%) by weight percentage. ), The content of the blue phosphor in percentage by weight
(%), 50% <a <60%, 25% <b <3
By satisfying the relational expression of 5% and c = 100-ab (%), (x, y) = (x, y) on the CIE1931 chromaticity diagram.
(0.2, 0.2), (x, y) = (0.2, 0.
4), (x, y) = (0.45, 0.2) (x, y) =
White light in a region surrounded by (0.45, 0.4), that is, white light similar to a white light source for general illumination can be obtained.
【００３９】また、上記橙色蛍光体、緑色蛍光体および
青色蛍光体をそれぞれ用いた場合では、橙色蛍光体の含
有量を重量百分率でｄ（％）、緑色蛍光体の含有量を重
量百分率でｂ（％）、青色蛍光体の含有量を重量百分率
でｃ（％）とした場合、１０％＜ｄ＜２０％、５５％＜
ｂ＜６５％、ｃ＝１００−ｂ−ｄ（％）なる関係式が満
たされることにより、上記と同じようにＣＩＥ１９３１
色度図上で（ｘ，ｙ）＝（０．２，０．２）、（ｘ，
ｙ）＝（０．２，０．４）、（ｘ，ｙ）＝（０．４５，
０．２）（ｘ，ｙ）＝（０．４５，０．４）で囲まれた
領域の白色光を得ることができる。When each of the orange phosphor, the green phosphor and the blue phosphor is used, the content of the orange phosphor is expressed as d (%) by weight percentage and the content of the green phosphor is expressed as b (weight percentage). (%), When the content of the blue phosphor is expressed as c (%) by weight percentage, 10% <d <20%, 55% <
By satisfying the relational expressions of b <65% and c = 100−b−d (%), CIE1931 is performed in the same manner as described above.
On the chromaticity diagram, (x, y) = (0.2, 0.2), (x, y)
y) = (0.2,0.4), (x, y) = (0.45,
0.2) (x, y) = (0.45, 0.4) white light can be obtained in a region surrounded by (0.4, 0.4).
【００４０】次に、蛍光体を透明基板６に塗布する方法
について説明する。Next, a method of applying a phosphor to the transparent substrate 6 will be described.
【００４１】まず、ポリエチレンオキサイドが溶かされ
た水溶液に、あらかじめ各色の蛍光体を混合した平均粒
径１．５μｍ以下の蛍光体を懸濁して蛍光体懸濁液を調
製する。蛍光体を溶液中に懸濁させる際、蛍光体が凝集
するのを防止するため、超音波撹拌を行った後、回転撹
拌を行うことが好ましい。First, a phosphor having an average particle size of 1.5 μm or less in which phosphors of each color are mixed in advance is suspended in an aqueous solution in which polyethylene oxide is dissolved to prepare a phosphor suspension. When suspending the phosphor in the solution, it is preferable to perform rotational stirring after performing ultrasonic stirring to prevent the phosphor from aggregating.
【００４２】この蛍光体懸濁液を所定の速度で回転させ
た被塗布部材である透明基板６の中心部に適量垂らし、
遠心力を利用して透明基板６全体に蛍光体懸濁液を塗布
する（スピンコーティング）。その後、乾燥、焼成工程
を経て蛍光体膜１１を形成する。このようなスピンコー
ティングを用いることにより、透明基板６に膜厚が均一
な蛍光体膜１１を容易に形成することができる。An appropriate amount of this phosphor suspension is suspended at the center of a transparent substrate 6 which is a member to be coated, which is rotated at a predetermined speed.
The phosphor suspension is applied to the entire transparent substrate 6 using centrifugal force (spin coating). Then, the phosphor film 11 is formed through a drying and baking process. By using such spin coating, the phosphor film 11 having a uniform film thickness on the transparent substrate 6 can be easily formed.
【００４３】なお、蛍光体膜１１の膜厚は、蛍光体懸濁
液の粘度、被塗布部材に滴下する蛍光体懸濁液量、被塗
布部材の回転速度、または蛍光体懸濁液中に含まれる蛍
光体量を制御することにより、所望の厚さに調整するこ
とができる。The thickness of the phosphor film 11 depends on the viscosity of the phosphor suspension, the amount of the phosphor suspension dropped on the member to be coated, the rotation speed of the member to be coated, or the thickness of the phosphor suspension. By controlling the amount of phosphor contained, it is possible to adjust the thickness to a desired thickness.
【００４４】ここで、蛍光体の平均粒径を１．５μｍ以
下に規定した理由について説明する。Here, the reason why the average particle size of the phosphor is specified to be 1.5 μm or less will be described.
【００４５】まず、平均粒径が０．１μｍ〜１０μｍの
範囲内で種々の蛍光体を作製し、作製した各々の蛍光体
を用い、上述した製造方法によって透明基板６の表面に
蛍光体膜１１を形成し、各蛍光体膜１１の表面粗さにつ
いて調べたところ、図２に示すとおりの結果が得られ
た。First, various phosphors having an average particle diameter in the range of 0.1 μm to 10 μm were produced, and the phosphor film 11 was formed on the surface of the transparent substrate 6 by the above-described production method using each of the produced phosphors. Was formed, and the surface roughness of each phosphor film 11 was examined. The result as shown in FIG. 2 was obtained.
【００４６】なお、図２において、縦軸は平均粒径が１
０μｍの蛍光体からなる蛍光体膜１１の表面粗さを１０
０とした場合の各蛍光体膜１１の相対的表面粗さを示し
ている。In FIG. 2, the ordinate represents an average particle size of 1
The surface roughness of the phosphor film 11 made of
The relative surface roughness of each phosphor film 11 when 0 is set is shown.
【００４７】図２から明らかなように、平均粒径が１．
５μｍ以下の蛍光体からなる蛍光体膜１１の相対的表面
粗さは３０以下であった。一方、平均粒径が１．５μｍ
を越える、例えば２．０μｍの蛍光体からなる蛍光体膜
１１の相対的表面粗さは６５であり、平均粒径が１．５
μｍの蛍光体からなる蛍光体膜１１の相対的表面粗さに
比して著しく大きくなることがわかった。As is apparent from FIG. 2, the average particle size is 1.
The relative surface roughness of the phosphor film 11 made of a phosphor of 5 μm or less was 30 or less. On the other hand, the average particle size is 1.5 μm
, The relative surface roughness of the phosphor film 11 composed of, for example, 2.0 μm phosphor is 65 and the average particle size is 1.5.
It was found that the surface roughness was significantly larger than the relative surface roughness of the phosphor film 11 made of a phosphor of μm.
【００４８】したがって、蛍光体の平均粒径を１．５μ
ｍ以下に規定することにより、蛍光体膜１１の表面粗さ
を著しく小さくすることができる。また、蛍光体膜１１
の表面粗さをより小さくするため、蛍光体の平均粒径を
１．０μｍ以下に規定することが好ましい。このように
蛍光体の平均粒径は小さければ小さいほど好ましいが、
製造が容易でありかつ高コスト化を防止するため、０．
１μｍ以上に規定することが好ましい。Therefore, the average particle size of the phosphor is 1.5 μm.
By setting m or less, the surface roughness of the phosphor film 11 can be significantly reduced. Also, the phosphor film 11
In order to further reduce the surface roughness of the phosphor, it is preferable to set the average particle size of the phosphor to 1.0 μm or less. Thus, the smaller the average particle size of the phosphor is, the better,
In order to facilitate the production and to prevent the cost from increasing, it is necessary to set the value of 0.1.
It is preferable to set the thickness to 1 μm or more.
【００４９】以上のように波長３４０ｎｍ〜３８０ｎｍ
の近紫外光を発する発光素子を有する発光ダイオードに
おいて、この発光素子から発せられる光によって励起さ
れて発光する蛍光体として、ピーク波長６２５ｎｍ〜７
５０ｎｍの赤色蛍光体またはピーク波長５７５ｎｍ〜６
７５ｎｍの橙色蛍光体と、ピーク波長５００ｎｍ〜６０
０ｎｍの緑色蛍光体と、ピーク波長４００ｎｍ〜５００
ｎｍの青色蛍光体とを含有する蛍光体とを用いることに
より、赤色、緑色、青色の三原色の各成分のバランスが
取れた一般照明用の白色光源の白色光とほぼ同様の白色
光であり、かつ発光強度の強い発光を得ることができ
る。As described above, the wavelength is 340 nm to 380 nm.
In a light emitting diode having a light emitting element that emits near-ultraviolet light, the phosphor that emits light when excited by light emitted from the light emitting element has a peak wavelength of 625 nm to
50 nm red phosphor or peak wavelength 575 nm to 6
75 nm orange phosphor, peak wavelength 500 nm to 60
0 nm green phosphor, peak wavelength 400 nm to 500
By using a phosphor containing a blue phosphor of nm and red, green, and white light of a white light source for general illumination in which each component of the three primary colors of blue is balanced, white light is substantially the same, In addition, light emission with high light emission intensity can be obtained.
【００５０】次に、本発明の効果を確認するための実験
例について説明する。Next, an experimental example for confirming the effect of the present invention will be described.
【００５１】図１に示す発光ダイオードにおいて、波長
３７５ｎｍの近紫外光を発する発光素子と、赤色蛍光体
として（Ｍｇ，Ｃａ，Ｍｎ）33（Ｇｅ，Ｍｎ）12Ｏ55を
重量百分率で５５％、緑色蛍光体として（Ｃａ，Ｚｎ）
29Ｇｅ14Ｏ57：Ｍｎ2+を重量百分率で３０％、青色蛍光
体として（Ｓｒ，Ｃａ）56（ＰＯ4）33Ｃｌ11：Ｅｕ2 +
を重量百分率で１５％になるように混合された蛍光体か
らなる膜厚２０μｍの蛍光体膜とを有する発光ダイオー
ド（以下、単に「本発明品Ａ」という）を作製し、作製
した発光ダイオードを１００ｍＷで発光させて発光強
度、および色度について調べた。In the light emitting diode shown in FIG. 1, a light emitting element which emits near-ultraviolet light having a wavelength of 375 nm and (Mg, Ca, Mn) 33 (Ge, Mn) 12 O 55 as a red phosphor are 55% by weight percentage, (Ca, Zn) as green phosphor
29 Ge 14 O 57: 30% by weight percentage of Mn 2+, (Sr, Ca) 56 (PO 4) as a blue phosphor 33 Cl 11: Eu 2 +
And a phosphor film having a thickness of 20 μm and comprising a phosphor mixed so that the weight percentage becomes 15% (hereinafter, simply referred to as “product A of the present invention”). Emission was performed at 100 mW, and emission intensity and chromaticity were examined.
【００５２】また、比較のために、一般的な蛍光ランプ
用の蛍光体、例えばＧｄＭｇＢ5Ｏ1 0：Ｃｅ3+（赤色蛍
光体）、ＬａＰＯ4：Ｃｅ3+（緑色蛍光体）、および
（Ｂａ，Ｃａ，Ｍｇ）10（ＰＯ4）6Ｃ12：Ｅｕ+2（青色
蛍光体）とを混合した蛍光体からなる膜厚２０μｍの蛍
光体膜とを有する点を除いて本発明品Ａと同じ構成を備
えている発光ダイオード（以下、単に「比較品」とい
う）についても、１００ｍＷで発光させて発光強度、お
よび色度について調べた。[0052] For comparison, phosphor for general fluorescent lamp, for example, GdMgB 5 O 1 0: Ce 3+ ( red phosphor), LaPO 4: Ce 3+ (green phosphor), and ( The product A of the present invention differs from the product A of the present invention except that it has a phosphor film having a film thickness of 20 μm made of a phosphor mixed with Ba, Ca, Mg) 10 (PO 4 ) 6 C 12 : Eu +2 (blue phosphor). A light-emitting diode having the same configuration (hereinafter simply referred to as “comparative product”) was also made to emit light at 100 mW, and the emission intensity and chromaticity were examined.
【００５３】その結果、本発明品Ａの発光強度は６５ｃ
ｄ／ｍ2であった。一方、比較品の発光強度は２０ｃｄ
／ｍ2であった。また、本発明品Ａの色度はＣＩＥ１９
３１色度図上で（ｘ，ｙ）＝（０．２８，０．３０）で
あった。一方、比較品の色度はＣＩＥ１９３１色度図上
で（ｘ，ｙ）＝（０．２１，０．２２）であった。As a result, the emission intensity of the product A of the present invention was 65 c
d / m 2 . On the other hand, the emission intensity of the comparative product is 20 cd
/ M 2 . The chromaticity of the product A of the present invention is CIE19.
(X, y) = (0.28, 0.30) on the 31-chromaticity diagram. On the other hand, the chromaticity of the comparative product was (x, y) = (0.21, 0.22) on the CIE1931 chromaticity diagram.
【００５４】次に、図１に示す発光ダイオードにおい
て、波長３７５ｎｍの近紫外光を発する発光素子と、橙
色蛍光体として（Ｙ，Ｃａ）40Ｏ40Ｓｎ20：Ｅｕ3+を重
量百分率で１３％、緑色蛍光体として（Ｃａ，Ｚｎ）29
Ｇｅ14Ｏ57：Ｍｎ2+を重量百分率で６２％、青色蛍光体
として（Ｓｒ，Ｃａ）56（ＰＯ4）33Ｃｌ11：Ｅｕ2+を
重量百分率で２５％になるように混合された蛍光体から
なる膜厚２０μｍの蛍光体膜とを有する発光ダイオード
（以下、単に「本発明品Ｂ」という）を作製し、作製し
た発光ダイオードを１００ｍＷで発光させて発光強度、
および色度について調べた。Next, in the light emitting diode shown in FIG. 1, a light emitting element which emits near-ultraviolet light having a wavelength of 375 nm and (Y, Ca) 40 O 40 Sn 20 : Eu 3+ as an orange phosphor are 13% by weight percentage. , As a green phosphor (Ca, Zn) 29
Fluorescence of Ge 14 O 57 : Mn 2+ mixed at 62% by weight and (Sr, Ca) 56 (PO 4 ) 33 Cl 11 : Eu 2+ as blue phosphor mixed at 25% by weight. A light-emitting diode having a 20 μm-thick phosphor film made of a body (hereinafter, simply referred to as “product B of the present invention”) was produced, and the produced light-emitting diode was made to emit light at 100 mW, and the light emission intensity was increased.
And chromaticity.
【００５５】その結果、本発明品Ｂの発光強度は６０ｃ
ｄ／ｍ2であった。また、本発明品Ｂの色度はＣＩＥ１
９３１色度図上で（ｘ，ｙ）＝（０．３０，０．３４）
であった。As a result, the emission intensity of the product B of the present invention was 60 c
d / m 2 . The chromaticity of the product B of the present invention is CIE1
(X, y) = (0.30, 0.34) on the 931 chromaticity diagram
Met.
【００５６】このように本発明は、赤色、緑色、青色の
三原色の各成分のバランスが取れた一般照明用の白色光
源の白色光とほぼ同様の白色光であり、かつ発光強度の
強い発光ダイオードを得ることができることが確認され
た。As described above, the present invention provides a light emitting diode having a strong light emission intensity, which is substantially the same as the white light of a white light source for general illumination in which the three primary colors of red, green and blue are balanced. It was confirmed that it could be obtained.
【００５７】なお、本発明の実施の形態では、蛍光体膜
１１を透明基板６の表面に形成した場合について説明し
たが、透明基板６上に透明ガラス板（図示せず）を設
け、この透明ガラス板の平面部分に蛍光体膜１１を形成
した場合でも上記と同様の効果を得ることができる。In the embodiment of the present invention, the case where the phosphor film 11 is formed on the surface of the transparent substrate 6 has been described. However, a transparent glass plate (not shown) is Even when the phosphor film 11 is formed on the flat portion of the glass plate, the same effect as described above can be obtained.
【００５８】また、上記実施の形態では、蛍光体膜１１
を透明基板６の表面に形成した場合について説明した
が、例えば蛍光体を樹脂部材４内に拡散させた場合や、
図示はしていないが発光ダイオードの前面にレンズを設
け、このレンズの表面に蛍光体膜１１を形成した場合で
も上記と同様の効果を得ることができる。In the above embodiment, the phosphor film 11
Is described on the surface of the transparent substrate 6, for example, when the phosphor is diffused into the resin member 4,
Although not shown, the same effect as described above can be obtained even when a lens is provided on the front surface of the light emitting diode and the phosphor film 11 is formed on the surface of the lens.
【００５９】さらに、上記実施の形態では、チップ型の
発光ダイオードを例示したが、本発明は例えば砲弾型の
発光ダイオード等にも適用することができる。Further, in the above embodiment, a chip type light emitting diode is exemplified, but the present invention can be applied to, for example, a shell type light emitting diode.
【００６０】[0060]
【発明の効果】以上説明したように本発明の照明用蛍光
体は、励起光源として、特に波長３４０ｎｍ〜３８０ｎ
ｍの近紫外光を発する光源を用いた場合に、赤色、緑
色、青色の三原色の各成分のバランスが取れた一般照明
用の白色光源の白色光とほぼ同様の白色光であり、かつ
発光強度の強い発光を得ることができる照明用蛍光体を
提供することができるものである。As described above, the illumination phosphor of the present invention can be used as an excitation light source, particularly at a wavelength of 340 nm to 380 n.
When a light source that emits near-ultraviolet light of m is used, the white light is approximately the same as the white light of a white light source for general lighting, in which the three primary colors of red, green, and blue are balanced, and the light emission intensity The present invention can provide an illumination phosphor capable of obtaining strong light emission.
【００６１】また、本発明の発光ダイオードは、波長３
４０ｎｍ〜３８０ｎｍの近紫外光を発する発光素子を有
する発光ダイオードであって、赤色、緑色、青色の三原
色の各成分のバランスが取れた一般照明用の白色光源の
白色光とほぼ同様の白色光であり、かつ発光強度の強い
発光を得ることができる発光ダイオードを提供すること
ができるものである。The light emitting diode of the present invention has a wavelength of 3
A light-emitting diode having a light-emitting element that emits near-ultraviolet light having a wavelength of 40 nm to 380 nm. The white light is substantially the same as the white light of a white light source for general illumination in which the three primary colors of red, green, and blue are balanced. An object of the present invention is to provide a light emitting diode capable of emitting light with high emission intensity.
【００６２】さらに、本発明の蛍光体の塗布方法は、被
塗布部材の平面部分に蛍光体膜を形成する際、蛍光体膜
の膜厚を均一にすることができる蛍光体の塗布方法を提
供することができるものである。Further, the phosphor coating method of the present invention provides a phosphor coating method capable of making the thickness of a phosphor film uniform when a phosphor film is formed on a flat portion of a member to be coated. Is what you can do.
【図１】本発明の実施の形態であるチップ型の発光ダイ
オードの一部切欠正面図FIG. 1 is a partially cutaway front view of a chip-type light emitting diode according to an embodiment of the present invention.
【図２】蛍光体の平均粒径と蛍光体膜の相対的表面粗さ
との関係を示す図FIG. 2 is a diagram showing a relationship between an average particle diameter of a phosphor and a relative surface roughness of a phosphor film.
１ ベース部 ２ 凹部 ３ 発光素子 ４ 樹脂部材 ５ａ，５ｂ 外部電極 ６ 透明基板 ７ 半導体 ８ Ｐ電極 ９ Ｎ電極 １０ 金属ワイヤー １１ 蛍光体膜 DESCRIPTION OF SYMBOLS 1 Base part 2 Depression 3 Light emitting element 4 Resin member 5a, 5b External electrode 6 Transparent substrate 7 Semiconductor 8 P electrode 9 N electrode 10 Metal wire 11 Phosphor film
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｌ 33/00 Ｈ０１Ｌ 33/00 Ｎ Ｆターム(参考） 4H001 XA08 XA12 XA15 XA20 XA30 XA31 XA32 XA38 XA39 5F041 AA14 CA40 CA46 DA07 DA44 DA45 DB01 DB09 EE25 FF11──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) H01L 33/00 H01L 33/00 NF term (Reference) 4H001 XA08 XA12 XA15 XA20 XA30 XA31 XA32 XA38 XA39 5F041 AA14 CA40 CA46 DA07 DA44 DA45 DB01 DB09 EE25 FF11
Claims (11)
によって励起されて白色発光する照明用蛍光体であっ
て、ピーク波長６２５ｎｍ〜７５０ｎｍの赤色蛍光体ま
たはピーク波長５７５ｎｍ〜６７５ｎｍの橙色蛍光体
と、ピーク波長５００ｎｍ〜６００ｎｍの緑色蛍光体
と、ピーク波長４００ｎｍ〜５００ｎｍの青色蛍光体と
を含有することを特徴とする照明用蛍光体。An illumination phosphor that emits white light when excited by near-ultraviolet light having a wavelength of 340 nm to 380 nm, comprising: a red phosphor having a peak wavelength of 625 nm to 750 nm or an orange phosphor having a peak wavelength of 575 nm to 675 nm; An illumination phosphor comprising a green phosphor having a wavelength of 500 nm to 600 nm and a blue phosphor having a peak wavelength of 400 nm to 500 nm.
z（ただし、ＡはＭｇ、ＣａおよびＭｎの中から選ばれ
る少なくとも一種の元素、ＤはＧｅおよびＭｎの中から
選ばれる少なくとも一種の元素であり、ｘ、ｙおよびｚ
は２０＜ｘ＜４０、０＜ｙ＜１５、ｚ＝１００−ｘ−ｙ
なる条件を満たす数である）で表される単相の酸化物で
あり、かつ結晶構造が斜方晶であるとともに、空間群が
Ｐｂａｍであることを特徴とする請求項１記載の照明用
蛍光体。2. The red phosphor of the general formula A x D y O
z (where A is at least one element selected from Mg, Ca and Mn, D is at least one element selected from Ge and Mn, x, y and z
Is 20 <x <40, 0 <y <15, z = 100-xy
2. The fluorescent light for illumination according to claim 1, wherein the single-phase oxide is a single-phase oxide represented by the formula (1) and has a crystal structure of orthorhombic and a space group of Pbam. body.
Ｅｕ3+（ただし、ＧはＹおよびＧａの中から選ばれる少
なくとも一種の元素であり、ｘ、ｙおよびｚは３５＜ｘ
＜４５、３５＜ｙ＜４５、ｚ＝１００−ｘ−ｙなる条件
を満たす数である）で表される単相の酸化物であり、か
つ結晶構造が六方晶であるとともに、空間群がＰ−３ｍ
であることを特徴とする請求項１記載の照明用蛍光体。3. The orange phosphor has a general formula of G x O y Sz:
Eu 3+ (where G is at least one element selected from Y and Ga, and x, y and z are 35 <x
<45, 35 <y <45, which is a number satisfying the condition of z = 100-xy), and has a hexagonal crystal structure and a space group of P -3m
2. The lighting phosphor according to claim 1, wherein:
yＯz：Ｍｎ2+（ただし、ＬはＣａおよびＺｎの中から選
ばれる少なくとも一種の元素であり、ｘ、ｙおよびｚは
２０＜ｘ＜３０、１０＜ｙ＜２０、ｚ＝１００−ｘ−ｙ
なる条件を満たす数である）で表される単相の酸化物で
あり、かつ結晶構造が菱面晶であるとともに、空間群が
Ｒ−３Ｈであることを特徴とする請求項１〜請求項３の
いずれかに記載の照明用蛍光体。4. The green phosphor has a general formula of L x Ge.
y O z : Mn 2+ (where L is at least one element selected from Ca and Zn, and x, y and z are 20 <x <30, 10 <y <20, z = 100−x) -Y
A single-phase oxide represented by the formula (1), wherein the crystal structure is rhombohedral, and the space group is R-3H. 4. The phosphor for illumination according to any one of 3.
yＣｌz：Ｅｕ2+（ただし、ＭはＳｒおよびＣａの中から
選ばれる少なくとも一種の元素であり、ｘ、ｙおよびｚ
は５０＜ｘ＜６０、３０＜ｙ＜４０、ｚ＝１００−ｘ−
ｙなる条件を満たす数である）で表される単相の酸化物
であり、かつ結晶構造が六方晶であるとともに、空間群
がＰ６３／ｍであることを特徴とする請求項１〜請求項
４のいずれかに記載の照明用蛍光体。5. The blue phosphor has a general formula M x (PO 4 )
y Cl z : Eu 2+ (where M is at least one element selected from Sr and Ca, x, y and z
Are 50 <x <60, 30 <y <40, z = 100−x−
y is a number that satisfies the condition of y), has a hexagonal crystal structure, and has a space group of P63 / m. 5. The phosphor for illumination according to any one of 4.
項４記載の前記緑色蛍光体と、請求項５記載の前記青色
蛍光体とを含有し、前記赤色蛍光体の含有量を重量百分
率でａ（％）、前記緑色蛍光体の含有量を重量百分率で
ｂ（％）、前記青色蛍光体の含有量を重量百分率でｃ
（％）とした場合、５０％＜ａ＜６０％、２５％＜ｂ＜
３５％、ｃ＝１００−ａ−ｂ（％）なる関係式が満たさ
れていることを特徴とする請求項１記載の照明用蛍光
体。6. The red phosphor according to claim 2, the green phosphor according to claim 4, and the blue phosphor according to claim 5, wherein the content of the red phosphor is determined by weight. The percentage of a (%) is a (%), the content of the green phosphor is b (%) in percentage by weight, and the content of the blue phosphor is c in percentage by weight.
(%), 50% <a <60%, 25% <b <
The lighting phosphor according to claim 1, wherein a relational expression of 35% and c = 100-ab (%) is satisfied.
項４記載の前記緑色蛍光体と、請求項５記載の前記青色
蛍光体とを含有し、前記橙色蛍光体の含有量を重量百分
率でｄ（％）、前記緑色蛍光体の含有量を重量百分率で
ｂ（％）、前記青色蛍光体の含有量を重量百分率でｃ
（％）とした場合、１０％＜ｄ＜２０％、５５％＜ｂ＜
６５％、ｃ＝１００−ｂ−ｄ（％）なる関係式が満たさ
れていることを特徴とする請求項１記載の照明用蛍光
体。7. The orange phosphor according to claim 3, the green phosphor according to claim 4, and the blue phosphor according to claim 5, wherein the content of the orange phosphor is expressed by weight. D (%) in percentage, the content of the green phosphor is b (%) in weight percentage, and the content of the blue phosphor is c in weight percentage.
(%), 10% <d <20%, 55% <b <
The lighting phosphor according to claim 1, wherein a relational expression of 65% and c = 100-bd (%) is satisfied.
を発する発光素子と、この発光素子から発せられる光に
よって励起されて発光する請求項１〜請求項７のいずれ
かに記載の照明用蛍光体とを有することを特徴とする発
光ダイオード。8. A lighting device according to claim 1, which emits near-ultraviolet light having a wavelength of 340 nm to 380 nm, and emits light when excited by light emitted from the light emitting device. A light emitting diode comprising:
る蛍光体の塗布方法であって、前記蛍光体を含有する蛍
光体懸濁液をスピンコーティングによって前記被塗布部
材の平面部分に塗布することを特徴とする蛍光体の塗布
方法。9. A method of applying a phosphor to a flat portion of a member to be coated, wherein the phosphor suspension containing the phosphor is applied to the flat portion of the member by spin coating. A method of applying a phosphor.
下であることを特徴とする請求項９記載の蛍光体の塗布
方法。10. The method according to claim 9, wherein the phosphor has an average particle size of 1.5 μm or less.
記蛍光体を溶液中に懸濁させる際、超音波撹拌を行った
後、回転攪拌を行うことを特徴とする請求項９または請
求項１０記載の蛍光体の塗布方法。11. The method according to claim 9, wherein, in the preparation of the phosphor suspension, when the phosphor is suspended in a solution, ultrasonic stirring is performed, and then rotational stirring is performed. 11. The method for applying a phosphor according to item 10.
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