JP2998696B2 - Light emitting diode - Google Patents

Light emitting diode

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Publication number
JP2998696B2
JP2998696B2 JP9143157A JP14315797A JP2998696B2 JP 2998696 B2 JP2998696 B2 JP 2998696B2 JP 9143157 A JP9143157 A JP 9143157A JP 14315797 A JP14315797 A JP 14315797A JP 2998696 B2 JP2998696 B2 JP 2998696B2
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resin
light
cup
wavelength
led
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JPH1065221A (en
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修二 中村
明人 岸
功祐 的場
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日亜化学工業株式会社
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Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は発光ダイオード(以下L BACKGROUND OF THE INVENTION The present invention is a light emitting diode (hereinafter referred to as L
EDという。 That the ED. )に係り、特に発光チップの発光波長を異なる波長に変換する、または発光チップの発光を一部吸収するLEDに関する。 Relates to), in particular into a wavelength different emission wavelength of the light emitting chip, or an LED for partially absorbed light emission of the light emitting chip.

【0002】 [0002]

【従来の技術】図2は従来のLEDの一構造を示す模式断面図であり、1は化合物半導体よりなる発光チップ、 BACKGROUND OF THE INVENTION FIG 2 is a schematic sectional view showing one structure of a conventional LED, 1 consists of a compound semiconductor light-emitting chips,
2はリードフレーム、3は発光チップの発光を発光観測面側に反射させる目的で設けられたカップ、4は発光素子全体を封止する樹脂である。 2 lead frame 3 cups provided for the purpose of reflecting the light emitted from the light emitting chip to the light emission observing surface side, 4 is a resin for sealing the whole light-emitting element. 通常、樹脂4は発光チップの発光を空気中に効率よく放出する目的で透明度の高い樹脂が選択されるが、他にその発光チップの発光色を変換する目的で、あるいは色を補正する目的で、その樹脂4の中に発光チップの発光を他の波長に変換する蛍光物質、または発光波長の発光波長を一部吸収するフィルター物質5(以下、波長変換材料5という。)が混入される場合がある。 Usually, the resin 4 is highly transparent resin is selected the emission of the light emitting chip for the purpose of efficiently released into the air, on the other the purpose to convert the emission colors of the light emitting chip, or for the purpose of correcting the color , if the fluorescent substance for converting the light emission of the light emitting chip to other wavelengths in the resin 4 or the filter material 5 which absorbs some of the emission wavelength of the emission wavelength, (hereinafter, referred to as wavelength converting material 5.) is mixed there is. この場合、波長変換材料5は樹脂4に均一に分散するように混入されるのが通常である。 In this case, the wavelength converting material 5 is typically being mixed so as to uniformly disperse in the resin 4.

【0003】 [0003]

【発明が解決しようとする課題】しかしながら、上記の目的で波長変換材料5を樹脂4中に均一に分散させると、この図に示すように、波長変換された光、または不要な波長がカットされた光は樹脂4中で四方八方に散乱してしまい、集光が悪くなるという問題がある。 [SUMMARY OF THE INVENTION However, the wavelength converting material 5 when dispersed uniformly in the resin 4 for the above purpose, as shown in this figure, the wavelength converted light or unwanted wavelengths, it is cut was light will be scattered in all directions in resin 4, there is a problem that the focusing is deteriorated. 図2の矢印は発光チップの光が波長変換材料5にあたり、波長変換された光が散乱する様子を模式的に示した図である。 Arrow in FIG. 2 is a diagram of light emitting chips per the wavelength converting material 5, which shows how the wavelength converted light scattered schematically. つまり、波長変換された光が散乱されることにより、発光観測面側の光量が減少して輝度が低くなるのである。 That is, when the wavelength converted light is scattered, it is the brightness becomes lower amount of light emission observing surface side is reduced.

【0004】また、波長変換材料5を蛍光物質に限定した場合、新たな問題点として、異なる発光色のLEDを接近して設置した際に、他のLED発光による蛍光物質のよけいな発光の問題がある。 Further, when limiting the wavelength converting material 5 to the fluorescent substance, as a new problem, when installed close the LED of different emission colors, the extra emission of the fluorescent substance by another LED emitting issues there is. 例えば、青色発光チップで緑色発光が得られる蛍光物質を含む緑色LEDと、単なる青色発光チップのみからなる青色LEDとを同一平面上に水平に近接して並べた場合、緑色LEDを消灯して、青色LEDを点灯すると、青色LEDから洩れ出る光、つまり散乱する光により、緑色LEDの蛍光物質が励起され、消灯した緑色LEDがあたかも点灯したような状態となり、両LEDの混色が発生する。 For example, a green LED comprising a fluorescent material that green light emission is obtained in the blue light-emitting chip, when juxtaposed horizontally a blue LED formed of only a mere blue light emitting chips on the same plane, off the green LED, When lighting the blue LED, the light from leaking from the blue LED, i.e. by scattering light, phosphor green LED is excited off the green LED becomes a state as lit though, color mixing of both LED occurs.

【0005】従って本発明の目的とするところは、LE Accordingly it is an object of the present invention, LE
Dの樹脂に波長変換材料を含有させて発光チップの波長変換を行う際、まず変換された発光の集光をよくしてL When performing the resin wavelength conversion of the light emitting chip contain a wavelength conversion material and D, and well the converted light-emitting condensing First L
EDの輝度を高めることを目的とし、また蛍光顔料を使用した際、波長の異なるLEDを近接して設置しても混色の起こらないLEDを提供することをもう一つの目的とする。 The purpose of increasing the brightness of the ED, also when using a fluorescent pigment, and another object is to provide an LED that does not work with mixed and placed in close proximity to different LED wavelengths.

【0006】 [0006]

【課題を解決するための手段】本発明のLEDは、 青色 Means for Solving the Problems The LED of the present invention, the blue
発光チップの発光を発光観測面側に反射するカップの底部に青色発光チップが載置された発光素子全体を、樹脂で封止してなる発光ダイオードであって、前記樹脂は前記カップの縁部の水平面よりも低く内部に充填される第一の樹脂と、その第一の樹脂を包囲する第二の樹脂部とを有し 、前記第一の樹脂には前記青色発光チップの発光波長を、 それよりも長波長の光に変換する蛍光物質が含有されていると共に第二の樹脂部は青色発光チッ The entire light-emitting element blue light emitting chip is placed on the bottom of the cup for reflecting the light emission observing surface side light emission of the light emitting chip, a light-emitting diode obtained by encapsulating in a resin, the resin is the edge of the cup a first resin portion is filled in the lower horizontal plane of, and a second resin portion surrounding the first resin portion, the the first resin portion emission of the blue light-emitting chips the wavelength, the second resin portion blue light emitting chip with a fluorescent substance that converts to the long wavelength light than it is contained
プの発光波長をそれよりも長波長の光に変換する蛍光物 Fluorescent substance for converting an emission wavelength of flops than to light of a long wavelength
質が含有されていないことを特徴する。 Features that quality is not contained.

【0007】 [0007]

【作用】本発明のLEDは、発光チップの発光を第一の樹脂内において所望の波長に変する。 [Action] LED of the present invention is converted to a desired wavelength light emission of the light emitting chip in the first the resin. このようにして波長変換された光は四方八方に散乱するが、散乱した光のほとんどはカップにより反射され、発光観測面側に集光される。 While such a light whose wavelength is converted by scatter in all directions, most of the scattered light is reflected by the cup, it is condensed on light emission observing surface side. つまり本願のカップは第一の樹脂内で波長変換材料により波長変換された光を反射して集光できるので、変換光の集光効率が格段に向上する。 That because application of the cup can collect light by reflecting the light whose wavelength is converted by the wavelength converting material in the first resin, the collection efficiency of the converted light is remarkably improved.

【0008】 また、蛍光物質を含む第一の樹脂をカップの縁部の水平面よりも低くなるように充填すると、外部から入射する光がカップの縁で遮られ、蛍光物質にまで到達しないことにより、LED間の混色を防止することができる。 Further, when filling the first resin including the fluorescent substance to be lower than the horizontal plane of the rim of the cup, the light incident from the outside is blocked by the edge of the cup, by not reach the fluorescent substance , it is possible to prevent color mixing between LED. 簡単にいうと、カップ深さを深くして蛍光物質を含む第一の樹脂がカップからはみ出さないようにすることにより、蛍光物質の励起源を発光チップの発光波長のみに制限できる。 Briefly, by the first resin comprising a deep fluorescent substance cup depth so as not to protrude from the cup, it can restrict the excitation source of the fluorescent material only in the emission wavelength of the light emitting chip.

【0009】 [0009]

【発明の実施の形態】図1は本願の一実施例のLEDの構造を示す模式断面図であり、図2と同様に、カップ3 Figure 1 DETAILED DESCRIPTION OF THE INVENTION is a schematic sectional view showing the structure of an LED of an embodiment of the present application, similarly to FIG. 2, cup 3
を有するリードフレーム2上に化合物半導体よりなる発光チップ1を載置した発光素子全体を、樹脂で封止した構造としている。 The whole light-emitting element mounted with the light emitting chip 1 made of a compound semiconductor on a lead frame 2 having, and the sealed structure in the resin. しかし、図2と異なるところは、封止樹脂がカップ3内部を充填する第一の樹脂11と、その第一の樹脂を包囲する第二の樹脂12とからなり、第一の樹脂11には発光チップの発光波長を他の波長に変換、または一部吸収する変換する波長変換材料5が含有されている。 However, Figure 2 differs from the can, the first resin 11 in which the sealing resin is filled inside the cup 3, made from the second resin 12 which surrounds the first resin, the first resin 11 is converting the emission wavelength of the light emitting chip to other wavelengths, or wavelength converting material 5 which converts to partially absorbed is contained.

【0010】本発明のLEDにおいて、第一の樹脂11 [0010] In the LED of the present invention, the first resin 11
と第二の樹脂の材料は同一材料でもよく、例えば両方ともエポキシ樹脂で構成し、第一の樹脂にのみ蛍光物質5 The material of the second resin may be the same material, constituted for example both an epoxy resin, a fluorescent substance only in the first resin 5
を含有させればよい。 The may be contained. さらに、第二の樹脂12の材料は図2の樹脂4と同一でもよいことはいうまでもない。 Further, the material of the second resin 12 that may be the same as the resin 4 in FIG. 2 course. また、波長変換材料5は蛍光物質であれば蛍光染料、蛍光顔料、蛍光体等、発光チップの発光波長を他の波長に変換できる材料であればどのようなものを使用してもよ The wavelength converting material 5 is fluorescent dye if the fluorescent substance, a fluorescent pigment, fluorescent material or the like, even when the emission wavelength of the light emitting chip for What the use as long as the material can be converted into another wavelength
There.

【0011】このような構造のLEDを得るには、例えばLED製造工程において、通常カップ3の空気を追い出す目的で、予め発光チップ1を載置したカップ内部を樹脂でプレディップするのであるが、プレディップする際に第一の樹脂11に波長変換材料5を含有させておき、波長変換材料5を含む第一の樹脂11が硬化した後、第二の樹脂12で封止することにより得ることができる。 [0011] To obtain an LED having such a structure, for example, in the LED manufacturing process, the purpose of expelling the air in the normal cup 3, although to a pre-dip the inner cup placed beforehand emitting chip 1 in the resin, leave the first resin 11 is contained a wavelength converting material 5 at the time of pre-dip, after the first resin 11 containing a wavelength converting material 5 is cured, it is obtained by sealing with a second resin 12 can. また予め波長変換材料5を含む第一の樹脂11をカップ3内部に注入してもよい。 Or it may be injected in advance of the first resin 11 containing a wavelength converting material 5 inside the cup 3. このようにして、波長変換材料5を含む第一の樹脂11をカップの3の内部に充填し、第一の樹脂11で波長変換された光のほとんどがカップ3の反射鏡内に戻り、発光観測面に反射することによりLEDの集光が格段に向上する。 In this way, filling the first resin 11 containing a wavelength converting material 5 inside the 3 cups, most of the wavelength converted light in the first resin 11 is returned to the reflector cup 3, the light emitting LED condenser is remarkably improved by reflecting the observation surface.

【0012】また第一の樹脂11と、第二の樹脂12とを異なる材料とし、第一の樹脂11、第二の樹脂12の屈折率を順に小さくして空気の屈折率1に近くなるように設定することにより波長変換された光の外部量子効率が向上する。 [0012] a first resin 11, the second resin 12 and the different materials, the first resin 11, the second to the refractive index of the resin 12 in order to decrease closer to the refractive index 1 of air external quantum efficiency of the wavelength converted light is improved by setting. なおこの場合、第一の樹脂11の材料には、発光チップ1の屈折率よりも小さい材料を選定することは言うまでもない。 It should be noted that in this case, the material of the first resin 11, it is needless to say to select a material smaller than the refractive index of the light emitting chip 1.

【0013】図3、および図4は本発明の他の実施例に係るLEDのカップ3の部分を拡大して示す模式断面図であり、図3は第一の樹脂11の表面が凸状になって硬化ししカップ3に充填された状態、図4は逆に凹状となって硬化して充填された状態を示している。 [0013] Figure 3, and Figure 4 is a schematic sectional view showing an enlarged portion of the cup 3 of the LED according to another embodiment of the present invention, Figure 3 on the surface convex first resin 11 is in a state of being filled in the cup 3 Shi hardened, FIG. 4 shows a state of being filled with cured becomes concave reversed. いずれの状態においても、波長変換材料5を蛍光物質とした場合、 In either state, when the wavelength converting material 5 was used as the fluorescent substance,
その蛍光物質を含む第一の樹脂11がカップ3の縁部の水平面よりも低くなるように充填されており、カップ3 As is filled to be lower than the horizontal plane of the first resin 11 containing a fluorescent substance is the edge of the cup 3, the cup 3
からはみ出していないので、カップ3の縁部により蛍光物質を励起する外部光を遮断でき、LEDの混色を防止することができる。 Since not protrude from the edge of the cup 3 can block external light to excite the fluorescent substance, it is possible to prevent color mixing the LED.

【0014】 [0014]

【発明の効果】以上説明したように、本発明のLEDはカップ内部に波長変換材料を含有する第一の樹脂を充填しているため、変換光がカップ内部で反射して集光されるため、輝度は倍以上に向上する。 As described above, according to the present invention, since the LED of the present invention is filled with the first resin containing a wavelength converting material in the cup interior, because the converted light is condensed reflected inside the cup , the brightness is improved more than doubled. また、蛍光顔料を第一の樹脂に含有させて波長変換を行う場合、カップ深さを深くして、第一の樹脂がカップからはみ出さないようにすることにより、LED間の混色が発生せず、例えばLEDで平面ディスプレイを実現した際には、非常に解像度のよい画像を得ることができる。 When performing a fluorescent pigment is contained in the first resin wavelength conversion, by deepening the cup depth, by which the first resin is prevented to protrude from the cup, color mixing between the LED not occur It not, for example, upon realizing the flat display in LED, can be obtained very good image resolution.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一LEDの構造を示す模式断面図。 Schematic sectional view showing a structure of a LED of the present invention; FIG.

【図2】従来のLEDの構造を示す模式断面図。 Figure 2 is a schematic sectional view showing a structure of a conventional the LED.

【図3】本発明の他の実施例に係るLEDのカップの部<br/>分を拡大して示す模式断面図。 Figure 3 is a schematic sectional view showing an enlarged part <br/> amount of cups of LED according to another embodiment of the present invention.

【図4】本発明の他の実施例に係るLEDのカップの部<br/>分を拡大して示す模式断面図。 Figure 4 is a schematic sectional view showing an enlarged part <br/> amount of cups of LED according to another embodiment of the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1・・・発光チップ 2・・・リードフレーム 3・・・カップ 5・・・波長変換材料 11・・・第一の樹脂 12・・・第二の樹脂 1 ... emitting chip 2 ... lead frame 3 ... cup 5 ... wavelength converting material 11 ... first resin 12 ... second resin

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 昭59−50455(JP,U) 実開 平5−63068(JP,U) 実開 昭53−43885(JP,U) 実公 昭52−45181(JP,Y1) (58)調査した分野(Int.Cl. 7 ,DB名) H01L 33/00 ────────────────────────────────────────────────── ─── of the front page continued (56) references JitsuHiraku Akira 59-50455 (JP, U) JitsuHiraku flat 5-63068 (JP, U) JitsuHiraku Akira 53-43885 (JP, U) real public Akira 52- 45181 (JP, Y1) (58 ) investigated the field (Int.Cl. 7, DB name) H01L 33/00

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】 青色発光チップの発光を発光観測面側に反射するカップの底部に青色発光チップが載置された発光素子全体を、樹脂で封止してなる発光ダイオードであって、前記樹脂は前記カップの縁部の水平面よりも低く 1. A whole light-emitting element blue light emitting chip is placed on the bottom of the cup for reflecting the emission of the blue light-emitting chips emitting observation side, a light-emitting diode obtained by encapsulating in a resin, the resin It is lower than the horizontal plane of the edge of the cup
    内部に充填されてなる第一の樹脂と、その第一の樹脂 A first resin portion formed by filling the interior, the first resin
    を包囲する第二の樹脂部とを有し 、前記第一の樹脂 Parts and a second resin portion surrounding said first resin portion
    には前記青色発光チップの発光波長を、それよりも長波 The emission wavelength of the blue light-emitting chip, the long wavelength than
    長の光に変換する蛍光物質が含有されていると共に第二 Second with the fluorescent substance is contained for converting the length of the optical
    の樹脂部は青色発光チップの発光波長をそれよりも長波 Long wave of the resin portion than the emission wavelength of the blue light-emitting chips
    長の光に変換する蛍光物質が含有されていないことを特徴する発光ダイオード。 Emitting diode, characterized in that the fluorescent substance for converting the length of the light is not contained.
JP9143157A 1997-05-17 1997-05-17 Light emitting diode Expired - Lifetime JP2998696B2 (en)

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JP9143157A JP2998696B2 (en) 1997-05-17 1997-05-17 Light emitting diode

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JPH1065221A JPH1065221A (en) 1998-03-06
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