JP5182399B2 - White light emitting device - Google Patents
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- JP5182399B2 JP5182399B2 JP2011159016A JP2011159016A JP5182399B2 JP 5182399 B2 JP5182399 B2 JP 5182399B2 JP 2011159016 A JP2011159016 A JP 2011159016A JP 2011159016 A JP2011159016 A JP 2011159016A JP 5182399 B2 JP5182399 B2 JP 5182399B2
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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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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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
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
- H01L2224/85909—Post-treatment of the connector or wire bonding area
- H01L2224/8592—Applying permanent coating, e.g. protective coating
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- 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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Description
本発明は、屋内、屋外、さらに水中などにおける表示や、光源またはディスプレイ用バックライトとして利用することができる、高輝度で耐候性及び寿命特性に優れた白色発光素子に関する。 The present invention relates to a white light-emitting element that can be used as an indoor, outdoor, or underwater display, or as a light source or a backlight for a display, and has high brightness and excellent weather resistance and life characteristics.
従来、可視発光ダイオードとしては緑色から赤色発光の素子しか実用化されていなかったが、近年、青色発光ダイオードが実用に供され始め、それに伴い、青色、緑色、赤色の各色発光素子を一つの画素として組み合わせたフルカラーの大型ディスプレイが実現している。 Conventionally, only green to red light emitting elements have been put into practical use as visible light emitting diodes, but in recent years blue light emitting diodes have begun to be put into practical use, and accordingly, blue, green and red light emitting elements are combined into one pixel. A large full-color display combined with the
これに対し、ダイオード単独で白色に発光する白色発光素子を得るためには、青色、緑色、赤色の各色発光素子を同時に発光させ、混色して白色化させることはできるが、小型の白色ディスプレイ、光源又は液晶ディスプレイ等のバックライト等を得るために、前記の各色発光素子を組み合わせると、画素自身が大きくなりすぎ、また、各色の駆動条件が異なると、駆動制御が煩雑になるという欠点があった。 On the other hand, in order to obtain a white light emitting element that emits white light with a diode alone, each light emitting element of blue, green, and red can emit light at the same time, and can be mixed to whiten, but a small white display, Combining the above-described light emitting elements to obtain a light source or a backlight such as a liquid crystal display has the disadvantage that the pixels themselves become too large, and that the driving control becomes complicated if the driving conditions for each color are different. It was.
他方、特許文献1、特許文献2等には、(Ga,Al)N青色発光ダイオードと、蛍光顔料又は蛍光物質を組み合わせた発光素子が記載されているが、発光ダイオードと蛍光物質とを組み合わせ白色発光を得ることについては何も記載はされていない。
On the other hand, Patent Document 1,
そこで、本発明では、青色又は青紫色発光ダイオードを用い、高輝度でコンパクトな白色発光素子を提供しようとするものである。 Therefore, the present invention intends to provide a high-intensity and compact white light-emitting element using a blue or blue-violet light-emitting diode.
本発明者等は、上記目的を達成するために鋭意検討した結果、青色又は青紫色発光の発光ダイオードが高輝度でバンド巾の狭いシャープな青色発光を呈することに着目し、この青色又は青紫色発光で励起され得る蛍光体を調べ、前記ダイオードの発光色と前記蛍光体の発光色を混色するときに、加色混合して白色光を呈する蛍光体を見出し、高輝度でコンパクトな白色発光素子の提供を可能にした。 As a result of intensive studies to achieve the above object, the present inventors have focused on the fact that blue or blue-violet light emitting diodes exhibit sharp blue light emission with high brightness and narrow bandwidth. Investigate phosphors that can be excited by light emission, and find a phosphor that emits white light by adding colors when mixing the light emission color of the diode and the light emission color of the phosphor. Made it possible to provide
即ち、本発明の構成は以下のとおりである。
(1)青色又は青紫色の発光ダイオードと、該発光ダイオードの発光を吸収して可視域に発光する1種又は2種類以上の蛍光体とを組み合わせた白色発光素子において、前記発光ダイオードと前記蛍光体の発光色が加色して互いに補色の関係になるように、前記蛍光体を選択したことを特徴とする白色発光素子。
(2)前記発光ダイオードと前記蛍光体の発光色を加色して、図1の色度座標中のWで示した領域内の発光色度点を有する白色に発光するように、前記蛍光体を選択したことを特徴とする上記(1)に記載の白色発光素子。
That is, the configuration of the present invention is as follows.
(1) A white light-emitting element in which a blue or blue-violet light-emitting diode and one or more phosphors that absorb light emitted from the light-emitting diode and emit light in the visible range are combined. A white light-emitting element, wherein the phosphor is selected so that the luminescent color of the body is added to form a complementary color relationship.
(2) The phosphors so as to emit white light having emission chromaticity points in the region indicated by W in the chromaticity coordinates of FIG. The white light-emitting element according to (1) above, wherein
(3)前記白色発光素子の発光色の発光色度点(x、y)が0.21≦x≦0.48、0.19≦y≦0.45の範囲にあることを特徴とする上記(1)又は(2)に記載の白色発光素子。
(4)前記蛍光体の励起光として、前記発光ダイオードの400〜500nmの波長の光を用いることを特徴とする上記(1)〜(3)のいずれかに記載の白色発光素子。
(3) The emission chromaticity point (x, y) of the emission color of the white light emitting element is in the range of 0.21 ≦ x ≦ 0.48, 0.19 ≦ y ≦ 0.45, The white light emitting element as described in (1) or (2).
(4) The white light-emitting element according to any one of (1) to (3), wherein light having a wavelength of 400 to 500 nm of the light-emitting diode is used as excitation light of the phosphor.
(5)前記蛍光体が(Zn,Cd)S:Ag,Cl蛍光体、(Zn,Cd)S:Ag,Al蛍光体、(Zn,Cd)S:Cu,Al蛍光体、(Zn,Cd)S:Cu,Cl蛍光体,(Zn,Cd)S:Cu,Au,Al蛍光体及び(Y,Gd)3(Al,Ga)5 O12:Ce,Eu蛍光体の群から選択される少なくとも一種の蛍光体であることを特徴とする上記(1)〜(4)のいずれかに記載の白色発光素子。
(6)前記発光ダイオードが(Inx,Aly,Ga1-x-y) N(但し、0≦x,0≦y,x+y≦1)、SiC、BN及びZn(S,Se)の群から選択される少なくとも一種のものであることを特徴とする上記(1)〜(5)のいづれかに記載の白色発光素子。
(5) The phosphor is a (Zn, Cd) S: Ag, Cl phosphor, (Zn, Cd) S: Ag, Al phosphor, (Zn, Cd) S: Cu, Al phosphor, (Zn, Cd) ) S: Cu, Cl phosphor, (Zn, Cd) S: Cu, Au, Al phosphor and (Y, Gd) 3 (Al, Ga) 5 O 12 : Ce, Eu phosphor The white light-emitting element according to any one of (1) to (4), wherein the white light-emitting element is at least one kind of phosphor.
(6) selected from the group of the light emitting diode (In x, Al y, Ga 1-xy) N ( where, 0 ≦ x, 0 ≦ y , x + y ≦ 1), SiC, BN and Zn (S, Se) The white light-emitting element according to any one of (1) to (5) above, wherein the white light-emitting element is any one of the above-described (1) to (5).
本発明は、上記の構成を採用することにより、従来の青色、緑色及び赤色発光ダイオードの組み合わせや、青色及び黄色発光ダイオードの組み合わせでは得られなかった、コンパクトで安価で簡便な白色発光素子を得ることができ、表示の多色化多様化に大きく寄与するものである。 By adopting the above configuration, the present invention obtains a compact, inexpensive, and simple white light emitting element that cannot be obtained by a conventional combination of blue, green and red light emitting diodes or a combination of blue and yellow light emitting diodes. This greatly contributes to the diversification and diversification of the display.
本発明は、青色又は青紫色の発光ダイオードと1種又は2種類以上の蛍光体とを組み合わせた白色発光素子であって、発光ダイオードの発光を吸収して可視域に発光する蛍光体を選択し、かつ、発光ダイオードと蛍光体の発光色を加色するときに互いに補色の関係になるような蛍光体を選択することにより、高輝度の白色発光を可能にした。 The present invention is a white light-emitting element combining a blue or blue-violet light-emitting diode and one or more phosphors, and selects a phosphor that absorbs light emitted from the light-emitting diode and emits light in the visible region. In addition, by selecting phosphors that are complementary to each other when the emission colors of the light-emitting diode and the phosphor are added, high-luminance white light emission is made possible.
図2は、本発明の白色発光素子の1例である断面構造を示した模式図である。フレーム3の上に青色又は青紫色発光ダイオードチップ4をセットし、その上に蛍光体を塗布し、全体を透明樹脂モールドで被覆し、チップからの電極端子5、6を引き出して素子を形成したものである。
FIG. 2 is a schematic view showing a cross-sectional structure as an example of the white light emitting device of the present invention. A blue or blue-violet light
本発明で使用する青色又は青紫色発光ダイオードとしては、(Inx,Aly,Ga1-x-y)N(但し、0≦x,0≦y,x+y≦1)、SiC、BN及びZn(S,Se)など
を挙げることができ、それらを組み合わせて用いることもできる。図3は、GaN発光ダイオードの発光スペクトル図を示したものである。この発光スペクトルの発光ピーク波長は、ほぼ450nm付近にある。本発明の蛍光体は、前記発光ダイオードの発光の一部を用いて励起される。その結果、発光ダイオードの発光色と励起された蛍光体の発光色が混色する。両者が補色の関係にあるときには、混色により白色発光を呈する。
Blue or blue-violet light emitting diodes used in the present invention include (In x , Al y , Ga 1-xy ) N (where 0 ≦ x, 0 ≦ y, x + y ≦ 1), SiC, BN and Zn (S , Se) and the like, and combinations thereof can also be used. FIG. 3 shows an emission spectrum of the GaN light emitting diode. The emission peak wavelength of this emission spectrum is about 450 nm. The phosphor of the present invention is excited by using a part of the light emitted from the light emitting diode. As a result, the emission color of the light emitting diode and the emission color of the excited phosphor are mixed. When the two are in a complementary color relationship, white light is emitted due to the mixed color.
本発明で使用する蛍光体は、青色又は青紫色発光ダイオードの発光の一部を励起光として発光する、ほぼ400〜500nmの範囲に励起波長を有する蛍光体であって、発光ダイオードの発光色と蛍光体の発光色が補色の関係にあり、混色により白色を呈するような蛍光体が選択される。具体的には、発光ダイオードの発光を吸収して自ら青色ないし赤色の可視光に発光する、以下の組成式で表される蛍光体を挙げることがてきる。 The phosphor used in the present invention is a phosphor having an excitation wavelength in a range of approximately 400 to 500 nm, which emits a part of the light emission of a blue or blue-violet light emitting diode as excitation light, and the emission color of the light emitting diode A phosphor is selected such that the emission color of the phosphor has a complementary color relationship and white color is exhibited by color mixture. Specific examples include phosphors represented by the following composition formula that absorb light emitted from the light-emitting diode and emit blue to red visible light.
青色発光する(Zn1-x,Cdx)S:Ag,Cl蛍光体(但し0≦x≦0.07)、(Zn1-x,Cdx)S:Ag,Al蛍光体(但し0≦x≦0.07)等。緑色発光する(Zn1-x,Cdx)S:Cu,Al蛍光体(但し、0≦x≦0.15)、(Zn1-x,Cdx)S:Cu,Cl蛍光体(但し、0≦x≦0.20)、(Zn1-x,Cdx)S:Ag,Cl蛍光体(但し、0.07≦x≦0.50)、(Zn1-x,Cdx)S:Ag,Al蛍光体(但し、0.07≦x≦0.50)、ZnS:Au,Cu,Al蛍光体等。 Blue-emitting (Zn 1-x , Cd x ) S: Ag, Cl phosphor (where 0 ≦ x ≦ 0.07), (Zn 1-x , Cd x ) S: Ag, Al phosphor (where 0 ≦ x ≦ 0.07) and the like. (Zn 1-x , Cd x ) S: Cu, Al phosphor (provided that 0 ≦ x ≦ 0.15), (Zn 1-x , Cd x ) S: Cu, Cl phosphor (provided that 0 ≦ x ≦ 0.20), (Zn 1−x , Cd x ) S: Ag, Cl phosphor (where 0.07 ≦ x ≦ 0.50), (Zn 1−x , Cd x ) S: Ag, Al phosphor (however, 0.07 ≦ x ≦ 0.50), ZnS: Au, Cu, Al phosphor, etc.
黄色発光する(Y1-u,Gdu)3(Al1-v,Gav)5O12:Ce,Eu蛍光体(但し、0≦u≦0.3、0≦v≦0.5)等。橙色又は赤色発光する(Zn1-x,Cdx)S:Cu,Al蛍光体(但し、0.15≦x≦0.30)、(Zn1-x,Cdx)S:Cu,Cl蛍光体(但し、0.20≦x≦0.30)、(Zn1-x,Cdx)S:Ag,Cl蛍光体(但し、0.50≦x≦0.90)、(Zn1-x,Cdx)S:Ag,Al蛍光体(但し、0.50≦x≦0.90)等。 Yellow-emitting (Y 1-u , Gd u ) 3 (Al 1-v , Ga v ) 5 O 12 : Ce, Eu phosphor (where 0 ≦ u ≦ 0.3, 0 ≦ v ≦ 0.5) etc. (Zn 1-x , Cd x ) S: Cu, Al phosphor (provided that 0.15 ≦ x ≦ 0.30), (Zn 1-x , Cd x ) S: Cu, Cl fluorescence emitting orange or red light Body (provided that 0.20 ≦ x ≦ 0.30), (Zn 1−x , Cd x ) S: Ag, Cl phosphor (provided that 0.50 ≦ x ≦ 0.90), (Zn 1−x , Cd x ) S: Ag, Al phosphor (provided that 0.50 ≦ x ≦ 0.90), etc.
本発明の蛍光体は、400〜500nmの範囲に励起波長を有し、これらの蛍光体の1種もしくは2種以上の中から、同時に用いる青色又は青紫色発光ダイオードと組み合わせて使用した時、その発光色の発光色度点(x、y)が0.21≦x≦0.48、0.19≦y≦0.45の範囲に入り、図1の色度座標中の領域W内に入りほぼ白色の発光を呈するように蛍光体の組み合わせを選択したものである。 The phosphor of the present invention has an excitation wavelength in the range of 400 to 500 nm, and when used in combination with a blue or blue-violet light emitting diode used simultaneously from one or more of these phosphors, The emission chromaticity point (x, y) of the emission color falls within the range of 0.21 ≦ x ≦ 0.48 and 0.19 ≦ y ≦ 0.45, and enters the region W in the chromaticity coordinates of FIG. The combination of phosphors is selected so as to exhibit almost white light emission.
なお、発光ダイオードと組み合わせて用いる蛍光体の種類や混合蛍光体の混合比により、上記x、y、u及びvの値が上記範囲を外れると、得られる白色発光素子の色度及び輝度において本発明の特性が得られなくなる。 Note that when the values of x, y, u, and v are out of the above range depending on the type of phosphor used in combination with the light emitting diode and the mixing ratio of the mixed phosphor, the chromaticity and luminance of the white light emitting element obtained are The characteristics of the invention cannot be obtained.
本発明の白色発光素子の製造は、予め所定量秤取した蛍光体を、アセトンやトルエン等有機溶剤等に希釈したアクリル樹脂、エポキシ樹脂、ポリイミド樹脂等の透明な樹脂と混合し、例えば、注射器のような細いノズルから発光ダイオードチップ上に数十μg滴下して塗布する。また、上記の樹脂の代わりに水溶性樹脂を用いたり、アルカリ珪酸塩を用いても良い。 The production of the white light emitting device of the present invention is performed by mixing a predetermined amount of a phosphor, which is mixed with a transparent resin such as an acrylic resin, an epoxy resin, or a polyimide resin diluted in an organic solvent such as acetone or toluene. Apply several tens of micrograms on a light emitting diode chip from such a thin nozzle. Further, a water-soluble resin may be used instead of the above resin, or an alkali silicate may be used.
蛍光体を塗布した発光ダイオードチップは乾燥後、エポキシ樹脂等の透明樹脂又はガラス製キャップを発光チップの蛍光体塗布部分に取り付けて白色発光素子を完成する。本発明の発光素子には、最大5V、30mAまでの定格直流負荷を加え発光させて白色発光を得ることができる。 After the light emitting diode chip coated with the phosphor is dried, a transparent resin such as an epoxy resin or a glass cap is attached to the phosphor coated portion of the light emitting chip to complete a white light emitting element. The light emitting device of the present invention can emit white light by applying a rated DC load of up to 5 V and 30 mA to emit light.
図4〜8は、本発明で使用する蛍光体の主発光を与えるための励起スペクトルを例示したものであり、図4はZnS:Ag,Cl蛍光体、図5はZnS;Cu,Al蛍光体、図6は(Zn0.15,Cd0.85)S:Ag,Cl蛍光体、図7はY3Al5O12:Ce,Eu蛍光体、図8は(Y0.8,Gd0.2)3Al5O12:Ce蛍光体の励起スペクトルを例示したものである。 4 to 8 illustrate the excitation spectrum for giving the main light emission of the phosphor used in the present invention, FIG. 4 is a ZnS: Ag, Cl phosphor, and FIG. 5 is a ZnS; Cu, Al phosphor. 6 shows (Zn 0.15 , Cd 0.85 ) S: Ag, Cl phosphor, FIG. 7 shows Y 3 Al 5 O 12 : Ce, Eu phosphor, and FIG. 8 shows (Y 0.8 , Gd 0.2 ) 3 Al 5 O 12. : Explains excitation spectrum of Ce phosphor.
図9〜13は、市販のGaN青色発光ダイオードの発光ピークである450nmで、上記各蛍光体を励起した時の発光スペクトルを示したものであり、図9はZnS:Ag,Cl蛍光体、図10はZnS;Cu,Al蛍光体、図11は(Zn0.15,Cd0.85)S:Ag,Cl蛍光体、図12はY3Al5O12:Ce,Eu蛍光体、図13は(Y0.8,Gd0.2)3Al5O12:Ce蛍光体の発光スペクトルを示したものである。 9 to 13 show emission spectra when the above phosphors are excited at 450 nm which is an emission peak of a commercially available GaN blue light emitting diode, and FIG. 9 shows ZnS: Ag, Cl phosphors, FIG. 10 is ZnS; Cu, Al phosphor, FIG. 11 is (Zn 0.15 , Cd 0.85 ) S: Ag, Cl phosphor, FIG. 12 is Y 3 Al 5 O 12 : Ce, Eu phosphor, and FIG. 13 is (Y 0.8 , Gd 0.2 ) 3 Al 5 O 12 : Ce emission spectrum.
図14〜16は、GaN青色発光ダイオードと組み合わせた本発明の白色発光素子の発光スペクトルを示したものであり、図14で使用した蛍光体は(Y0.8,Gd0.2)3Al5O12:Ce、図15で使用した蛍光体はZnS:Cu,Al及び(Zn0.15,Cd0.85)S:Ag,Cl、図16で使用した蛍光体はY3Al5O12:Ce,Eu及び(Zn0.15,Cd0.85)S:Ag,Clである。 14 to 16 show the emission spectrum of the white light emitting device of the present invention combined with a GaN blue light emitting diode, and the phosphor used in FIG. 14 is (Y 0.8 , Gd 0.2 ) 3 Al 5 O 12 : The phosphors used in FIG. 15 are ZnS: Cu, Al and (Zn 0.15 , Cd 0.85 ) S: Ag, Cl, and the phosphors used in FIG. 16 are Y 3 Al 5 O 12 : Ce, Eu and (Zn 0.15 , Cd 0.85 ) S: Ag, Cl.
〔実施例1〕
エポキシ樹脂(日東電工社製、NT8014) 1gr
酸無水物系硬化剤 1gr
蛍光体(Y0.8,Gd0.2)3Al5O12:Ce 2mg
上記の蛍光体と樹脂との混合液を注射器を用いて、450nmに発光ピークを有するGaN青色発光ダイオードチップ(0.4mm角)上に50μリットル滴下し、乾燥した後、更に半円形の透明なエポキシ樹脂キャップで被覆して白色発光素子を得た。
この白色発光素子は図14の発光スペクトルを示し、その発光色度W3はx=0.27
5、y=0.335であった。なお、上記蛍光体の発光色度はY1であった。
[Example 1]
Epoxy resin (NT8014, manufactured by Nitto Denko Corporation) 1 gr
1g of acid anhydride curing agent
Phosphor (Y 0.8, Gd 0.2) 3 Al 5 O 12: Ce 2mg
Using a syringe, the mixture of the above phosphor and resin was dropped on a GaN blue light-emitting diode chip (0.4 mm square) having an emission peak at 450 nm, dried, and then further semicircular transparent A white light emitting device was obtained by covering with an epoxy resin cap.
This white light emitting element shows the emission spectrum of FIG. 14, and its emission chromaticity W 3 is x = 0.27.
5, y = 0.335. The emission chromaticity of the phosphor was Y 1.
〔実施例2〕
アクリル樹脂(日本カーバイト工業製、ニッカゾール、固形分50%) 1gr
脱イオン水 5gr
蛍光体 ZnS:Cu,Al 1mg
(Zn0.15,Cd0.85)S:Ag,Cl 0.5mg
上記の蛍光体と樹脂との混合液を注射器を用いて、450nmに発光ピークを有するGaN青色発光ダイオードチップ(0.4mm角)上に50μリットル滴下し、乾燥した後、更に半円形の透明なエポキシ樹脂キャップで被覆して白色発光素子を得た。この白色発光素子は図15の発光スペクトルを示し、その発光色度W2はx=0.237、y=0.
274であった。なお、上記蛍光体の発光色度はG2とRであった。
[Example 2]
Acrylic resin (Nihon Carbite Industries, Nikkasol, solid content 50%) 1gr
Deionized water 5gr
Phosphor ZnS: Cu, Al 1 mg
(Zn 0.15 , Cd 0.85 ) S: Ag, Cl 0.5 mg
Using a syringe, the mixture of the above phosphor and resin was dropped on a GaN blue light-emitting diode chip (0.4 mm square) having an emission peak at 450 nm, dried, and then further semicircular transparent A white light emitting device was obtained by covering with an epoxy resin cap. This white light emitting element shows the emission spectrum of FIG. 15, and its emission chromaticity W 2 is x = 0.237, y = 0.
274. The emission chromaticity of the phosphor was G 2 and R.
〔実施例3〕
水ガラス(東京応化社製、オーカシールA) 1gr
酢酸バリウム 10gr
蛍光体 Y3Al5O12:Ce,Eu0.001 1mg
(Zn0.15,Cd0.85)S:Ag,Cl 0.5mg
上記の蛍光体と水ガラスの混合液を注射器を用いて、450nmに発光ピークを有するGaN青色発光ダイオードチップ(4mm角)上に30μリットル滴下し、乾燥した後、更に半円形の透明なエポキシ樹脂キャップで被覆して白色発光素子を得た。
この白色発光素子は図16の発光スペクトルを示し、その発光色度W1はx=0.22
3、y=0.253であった。なお、上記蛍光体の発光色度はY2とRであった。
Example 3
1 glass of water glass (Okaseal A, manufactured by Tokyo Ohkasha)
Barium acetate 10gr
Phosphor Y 3 Al 5 O 12 : Ce, Eu 0.001 1mg
(Zn 0.15 , Cd 0.85 ) S: Ag, Cl 0.5 mg
Using a syringe, the mixture of the above phosphor and water glass is dropped on a GaN blue light-emitting diode chip (4 mm square) having an emission peak at 450 nm, dried, and then further semicircular transparent epoxy resin. A white light emitting device was obtained by covering with a cap.
This white light emitting element shows the emission spectrum of FIG. 16, and its emission chromaticity W 1 is x = 0.22.
3, y = 0.253. The emission chromaticity of the phosphor was Y 2 and R.
1.樹脂モールド
2.蛍光体
3.フレーム
4.発光ダイオードチップ
5.電極端子
1. 1.
Claims (9)
上記発光ダイオード上に塗布形成された無機蛍光体と透明な樹脂との混合層であって、該混合層が青色の発光ダイオードの発光の一部を励起光として黄色発光する無機蛍光体、青色の発光ダイオードの発光の一部を励起光として該橙色又は赤色発光する無機蛍光体及び透明な樹脂からなる無機蛍光体と透明な樹脂との混合層であり、上記黄色発光する無機蛍光体が(Y1−u,Gdu)3(Al1-vGav)5O12:Ce,Eu蛍光体(但し、u及びvはそれぞれ、0≦u≦0.3、及び0≦v≦0.5)である混合層を有し、
発光ダイオードの発光のうち無機蛍光体により吸収されなかった発光色と発光ダイオードの発光の一部を用いて励起される無機蛍光体の発光色とが混色して、発光色度点(x、y)が、0.21≦x≦0.48、0.19≦y≦0.45の範囲に入る白色の光を放出し、その白色光の発光スペクトルが赤色発光領域に発光ピークを有する、白色発光素子。 Is set on the frame (In x, Al y, Ga 1-xy) N ( where, 0 ≦ x, 0 ≦ y , x + y ≦ 1) of the blue color represented by the composition formula of the light emitting diode and the light emitting diode on a mixed layer of a coating formed inorganic phosphor and a transparent resin, an inorganic phosphor mixture layer is a yellow light emitting part of the emission of the blue light-emitting diode as the excitation light, blue light-emitting diode Is a mixed layer of an inorganic phosphor and a transparent resin made of an inorganic phosphor that emits orange or red light and a transparent resin using a part of the light emitted as excitation light, and the inorganic phosphor that emits yellow light is (Y 1- u, Gd u) 3 (Al 1-v Ga v) 5 O 12: Ce, with Eu phosphor (wherein each u and v, 0 ≦ u ≦ 0.3, and 0 ≦ v ≦ 0.5) Having a mixed layer,
Of the luminescence of the light emitting diode, the luminescent color that is not absorbed by the inorganic phosphor and the luminescent color of the inorganic phosphor that is excited using a part of the luminescence of the light emitting diode are mixed, and the emission chromaticity point (x, y ) Emits white light falling within the range of 0.21 ≦ x ≦ 0.48 and 0.19 ≦ y ≦ 0.45, and the white light emission spectrum has an emission peak in the red light emitting region. Light emitting element.
青色の発光ダイオードをフレーム上にセットする工程、
青色の発光ダイオードの発光の一部を励起光として黄色発光する、(Y1−u,Gdu)3(Al1-vGav)5O12:Ce,Eu蛍光体(但し、u及びvはそれぞれ、0≦u≦0.3、及び0≦v≦0.5)である無機蛍光体及び青色の発光ダイオードの発光の一部を励起光として橙色又は赤色発光する無機蛍光体を、透明な樹脂と混合する工程、
得られた無機蛍光体と透明な樹脂との混合物を、フレーム上にセットされた青色の発光ダイオードの上に、細いノズルを用いて滴下塗布し無機蛍光体と透明な樹脂との混合層を形成する工程、を含み
発光ダイオードの発光のうち無機蛍光体により吸収されなかった発光色と、発光ダイオードの発光の一部を用いて励起される無機蛍光体の発光色とが混色して、発光色度点(x、y)が、0.21≦x≦0.48、0.19≦y≦0.45の範囲に入る白色の光を放出するように蛍光体の組合せを選択し、さらに、上記の放出される光の発光スペクトルが赤色発光領域に発光ピークを有する白色発光素子の製造方法。 Is set on the frame (In x, Al y, Ga 1-xy) N ( where, 0 ≦ x, 0 ≦ y , x + y ≦ 1) of the blue color represented by the composition formula of the light emitting diodes and light emitting diodes on A method for producing a white light emitting device having a mixed layer of an inorganic phosphor and a transparent resin formed on the substrate,
Step of setting the blue light-emitting diodes on the frame,
To yellow emitting part of the emission of the blue light-emitting diode as the excitation light, (Y 1-u, Gd u) 3 (Al 1-v Ga v) 5 O 12: Ce, Eu phosphor (where, u and v respectively, 0 ≦ u ≦ 0.3, and 0 ≦ v ≦ 0.5) is a inorganic phosphor and an orange or red emission to inorganic phosphors a part of the emission of the blue light-emitting diode as the excitation light Mixing with transparent resin,
The mixture of the obtained inorganic phosphor and a transparent resin, on the light emitting diodes of blue which is set on the frame, a mixed layer of an inorganic phosphor and a transparent resin is applied dropwise using a thin nozzle A light emitting diode that emits light that is not absorbed by the inorganic phosphor and a color that emits light from the inorganic phosphor that is excited by using part of the light emitted from the light emitting diode. Selecting a phosphor combination such that the chromaticity point (x, y) emits white light falling within the range of 0.21 ≦ x ≦ 0.48, 0.19 ≦ y ≦ 0.45; A method for manufacturing a white light emitting device, wherein the emission spectrum of the emitted light has a light emission peak in a red light emitting region.
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