JP3715904B2 - Semiconductor light emitting device - Google Patents
Semiconductor light emitting device Download PDFInfo
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- JP3715904B2 JP3715904B2 JP2001167658A JP2001167658A JP3715904B2 JP 3715904 B2 JP3715904 B2 JP 3715904B2 JP 2001167658 A JP2001167658 A JP 2001167658A JP 2001167658 A JP2001167658 A JP 2001167658A JP 3715904 B2 JP3715904 B2 JP 3715904B2
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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
- H01L2224/01—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
- H01L2224/48257—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 die pad of the item
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Description
【０００１】
【発明の属する技術分野】
本発明は、半導体発光装置に係り、詳細には発光素子から発光された光を波長変換して外部に放射する半導体発光装置に関する。
【０００２】
【従来の技術】
図６に示す従来の半導体発光装置は、一端に皿状の支持体（ヘッダ）（１）を備えた第１のリード（２）と、一端にリード細線接続部（メタルポスト）（３）を備えた第２のリード（４）と、ヘッダ（１）に接着剤によって固着された半導体発光素子（５）と、半導体発光素子（５）の上面に形成された２つの電極（図示せず）とメタルポスト（３）等との間を電気的に接続する２本のリード細線（６）と、半導体発光素子（５）、リード細線（６）、第１のリード（２）及び第２のリード（４）の一端側を被覆する樹脂封止体（７）とを有する。この半導体発光装置の発光色は、半導体発光素子（５）の固有の発光波長によって決定され、例えば、ＧａＡｌＰ系、ＧａＰ系及びＧａＮ系の半導体発光素子を半導体発光素子（５）に使用すれば発光色は、それぞれ赤色、緑色及び青色となる。また、ＧａＡｓ系の半導体発光素子を使用すれば赤外発光の半導体発光装置が得られる。
【０００３】
【発明が解決しようとする課題】
ところで、近年では赤、緑、青の中間色又は白色等の混合色の発光が可能な半導体発光装置の実現が望まれている。中間色又は混合色を実現するため、半導体発光素子の発光により励起されて蛍光を発する蛍光体を樹脂封止体（７）中に添加し、半導体発光素子（５）の光を波長変換して樹脂封止体（７）の外部に放射する半導体発光装置が提案されている。蛍光体を樹脂封止体（７）中に混合する半導体発光装置は、光の波長変換によって所望の発光色を得られる反面、蛍光体による光散乱によって発光輝度が著しく低下する欠点があった。そこで、本発明では、高輝度で所望の発光色が得られる半導体発光装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明による半導体発光装置は、複数のリード（２）（４）と、複数のリード（２）（４）間に電気的に接続された半導体発光素子（５）と、複数のリード（２）（４）の一端及び半導体発光素子（５）を封止する樹脂封止体（７）と、一端に開口部（９ｃ）が設けられ且つ樹脂封止体（７）と同一形状の内面を有して樹脂封止体（７）に被着された透光性の蛍光カバー（９）とを備えている。蛍光カバー（９）は、弾力性を有し、透光性の樹脂基材と、樹脂基材中に添加された蛍光体とを備え且つ蛍光体を含む樹脂の射出成形により形成される。樹脂封止体（７）は、円柱状の封止部（７ａ）と、封止部（７ａ）の一端側にこれと一体に形成されたほぼ半球状のレンズ部（７ｂ）とを備えている。蛍光カバー（９）は、樹脂封止体（７）の封止部（７ａ）に合致する形状を有する円筒状のカバー本体（９ａ）と、樹脂封止体（７）のレンズ部（７ｂ）に合致する形状でカバー本体（９ａ）に一体に半球状に形成された球面部（９ｂ）とを備え、カバー本体（９ａ）及び球面部（９ｂ）は、それぞれ樹脂封止体（７）の封止部（７ａ）及びレンズ部（７ｂ）に密着し、蛍光カバー（９）が樹脂封止体（７）に密着して装着されるので、装着後に振動等の外力が蛍光カバー（９）に加えられても蛍光カバー（９）は樹脂封止体（７）から容易には離脱しないが、蛍光カバー（９）を容易に交換して異なる波長の光を取り出すことができる。半導体発光素子（５）から照射した光は、樹脂封止体（７）を通り蛍光カバー（９）中の蛍光体によって波長変換されて蛍光カバー（９）の外部に取り出される。半導体発光素子（５）から照射した光により樹脂封止体（７）を介して蛍光カバー（９）の樹脂基材中の蛍光体を励起するので、蛍光カバー（９）によって市販の半導体発光素子（５）から生ずる光とは異なる波長の光を取り出すことができる。
【０００５】
本発明の実施の形態では、樹脂封止体（７）に被着された蛍光カバー（９）は透光性を有する接着剤により樹脂封止体（７）に密着してもよい。
【０００６】
樹脂封止体（７）と蛍光カバー（９）との間の空気を除去する複数個の小さな孔が蛍光カバー（９）に形成される。
【０００７】
チップＬＥＤ（８）により半導体発光装置を構成し、チップＬＥＤ（８）から照射され且つ蛍光カバー（９）内で波長変換された光をライトガイド（１０）の一端（１０ａ）に受光させ、ライトガイド（１０）の他端（１０ｂ）又は一方の主面（１０ｃ）から照射させることにより所望の位置で波長変換された光を取り出すことができる。
【０００８】
【発明の実施の形態】
以下、発光ダイオードに適用した本発明による半導体発光装置の実施の形態を図１〜図５について説明する。図１〜図５では、図６に示す部分と同一の箇所には同一の符号を付し、説明を省略する。図１に示すように、本実施の形態による半導体発光装置は、レンズ形の樹脂封止体（７）を備えたＬＥＤ（半導体発光ダイオード）（８）と、樹脂封止体（７）を包囲する蛍光カバー（９）とを備えている。周知のトランスファモールド法又はキャスティング法によって形成される樹脂封止体（７）は、円柱状の封止部（７ａ）と、封止部（７ａ）の一端側にこれと一体に形成されたほぼ半球状のレンズ部（７ｂ）とを有する。樹脂封止体（７）は光透過性を有する例えばエポキシ系樹脂等を主成分とし、これにシリカ等から成る散乱剤が混入され、若干の非発光物質の顔料が添加される場合もある。図２に示すＬＥＤ（８）は、図６に示す従来の半導体発光装置と基本的に同一の構造を備えているが、樹脂封止体（７）には蛍光体は添加されない。図２に示すＬＥＤ（８）の半導体発光素子（５）には、４３０〜４８０ｎｍ付近に発光ピークを有する青色系発光色を生ずるＧａＮ系の半導体発光素子が使用される。蛍光カバー（９）は、例えば樹脂基材中に半導体発光素子（５）の発光によって励起されて蛍光を発する蛍光体が添加されている。樹脂基材は透光性のポリエステル樹脂、アクリル樹脂、ウレタン、ナイロン、シリコーン樹脂、塩化ビニル、ポリスチロール、ベークライト、ＣＲ３９（アクリル・グリコール・カーボネート樹脂）等から選択される。ウレタン、ナイロン、シリコーン樹脂は蛍光カバー（９）にある程度の弾力性を付与するため、樹脂封止体（７）への装着が容易である。蛍光体は、光線が照射されたときに、その光線を吸収しながら、その光線の波長とは異なる波長の可視光線を発射する物質をいう。一般に蛍光体は、基体、付活体及び融剤よりなる。基体には、亜鉛、カドミウム、マグネシウム、シリコン、イットリウム等の稀土類元素等の酸化物、硫化物、珪酸塩、バナジン酸塩等が適し、銅、鉄、ニッケルのそれ等は不適である。付活体は銀、銅、マンガン、クロム、ユウロビウム、亜鉛、アルミニウム、鉛、リン、砒素、金等で一般に０.００１％〜数％程度の微量が用いられる。融剤は普通塩化ナトリウム、塩化カリウム、炭酸マグネシウム、塩化バリウムが使用される。前記無機蛍光体の外、フルオレセイン、エオシン、油類（鉱物油）等の有機蛍光体を使用できる。
【０００９】
図３に示すように、蛍光カバー（９）は、円筒状のカバー本体（９ａ）と、カバー本体（９ａ）に一体に半球状に形成された球面部（９ｂ）とを備えている。円筒状カバー本体（９ａ）は樹脂封止体（７）の封止部（７ａ）に合致する形状を備え、球面部（９ｂ）は樹脂封止体（７）のレンズ部（７ｂ）に合致する形状を有する。蛍光カバー（９）の内面（９ｄ）は樹脂封止体（７）と同一の形状を有し、カバー本体（９ａ）の一端に設けられた開口部（９ｃ）を通じて、蛍光カバー（９）を樹脂封止体（７）に装着すると、蛍光カバー（９）の内面（９ｄ）は樹脂封止体（７）の外面に密着する。即ち、蛍光カバー（９）のカバー本体（９ａ）と球面部（９ｂ）はそれぞれ樹脂封止体（７）の封止部（７ａ）とレンズ部（７ｂ）に密着して装着されるので、装着後に振動等の外力が蛍光カバー（９）に加えられても蛍光カバー（９）は樹脂封止体（７）から容易には離脱しない。
【００１０】
本実施例では、４３０〜４８０ｎｍ付近の波長によって励起され、５００〜６００ｎｍ付近に発光ピークを有する発光波長が得られ且つ例えば基体が硫化亜鉛及び硫化カドミウム、付活体が銅、融剤が塩化バリウム及び塩化カリウムから成る蛍光体を添加する。
【００１１】
図１に示す本発明の半導体発光装置では、４３０〜４８０ｎｍ付近に発光ピークを有する青色発光のＧａＮ系半導体発光素子を半導体発光素子（５）に使用して、半導体発光素子（５）から発光した光を樹脂封止体（７）を介して蛍光カバー（９）中の蛍光体に照射して、蛍光体を励起する。このため、蛍光カバー（９）中の蛍光体によって５００〜６００ｎｍ付近に発光ピークを有する白色光に波長変換されて蛍光カバー（９）の外部に取り出すことができる。この場合に、蛍光体は蛍光カバー（９）に添加され、樹脂封止体（７）中には添加されないので、樹脂封止体（７）内では蛍光体による光散乱が生じない。また、十分に肉薄なフィルム状の蛍光カバー（９）内では蛍光体による光散乱は比較的小さい。このため、ヘッダ（１）及び樹脂封止体（７）のレンズ部（７ｂ）の形状等によって所望の光指向性が得られ、波長変換に伴う輝度の低下を最小限に抑制することができる。
【００１２】
蛍光カバー（９）は、蛍光体を含む樹脂の射出成形により所定の形状に形成した後、樹脂封止体（７）に被着すると比較的簡単に完成できる。
【００１３】
本実施の形態では下記の作用効果が得られる。
<1> 蛍光体は蛍光カバー（９）に添加され、樹脂封止体（７）中には添加されないので、樹脂封止体（７）内では蛍光体による光散乱が生じない。
<2> また、十分に肉薄なフィルム状の蛍光カバー（９）内では蛍光体による光散乱は比較的小さい。このため、ヘッダ（１）及び樹脂封止体（７）のレンズ部（７ｂ）の形状等によって所望の光指向性が得られ、波長変換に伴う輝度の低下を最小限に抑制することができる。
<3> 蛍光カバー（９）によって市販の半導体発光素子（５）から生ずる光とは異なる波長の光を取り出すことができる。
<4> 蛍光カバー（９）を容易に交換して異なる波長の光を取り出すことができる。
<5> 複数種の蛍光体を蛍光カバー（９）に混合することにより所望の混合色又は中間色の光を取り出すことができる。
<6> 蛍光カバー（９）が樹脂封止体（７）に密着して装着されるので、装着後に振動等の外力が蛍光カバー（９）に加えられても蛍光カバー（９）は樹脂封止体（７）から容易には離脱しない。
<7> 市販の半導体発光素子（５）に蛍光カバー（９）を被着できるので、半導体発光装置を安価に製造することができる。
【００１４】
本発明の前記実施の形態では、相対的に小さい発光波長の光によって励起されて相対的に大きい発光波長の光を放出する蛍光体を用いたが、相対的に大きい発光波長の光によって励起されて相対的に小さい発光波長の光を放出する蛍光体を用いてもよい。この場合、発光波長の大きい半導体発光素子を使用して発光波長の比較的小さい発光色の半導体発光装置を得ることができる。
【００１５】
ＬＥＤ（８）の樹脂封止体（７）の中にも、蛍光カバー（９）中の蛍光体による光変換を補助する少量の蛍光体を添加してもよい。但し、樹脂封止体（７）中に蛍光体を添加すると、発光輝度を低下するので実施例のように、蛍光カバー（９）のみに蛍光体を添加するのが望ましい。蛍光カバー（９）内に蛍光体と共に蛍光増感剤を混合してもよい。
【００１６】
樹脂封止体（７）全体でなく、レンズ部（７ｂ）のみに蛍光カバー（９）を部分的に被着してもよい。樹脂封止体（７）と蛍光カバー（９）との間に空気層が形成されることを防止するため、蛍光カバー（９）に小さな孔を複数個形成してもよい。この場合、蛍光体によって波長変換された光と、孔を通じて放出される発光素子（５）からの光との混合色を観察することができる。樹脂封止体（７）と蛍光カバー（９）との間に透光性の接着剤を充填して、樹脂封止体（７）と蛍光カバー（９）との間の空気層を除去して発光効率を向上してもよい。また、例えば図５に示すように、チップＬＥＤ（８）にも本発明を適用することができる。この場合、基板（１１）上に印刷形成された配線導体がリードに相当し、樹脂封止体（７）に蛍光カバー（９）が被着される。蛍光カバー（９）に対向してグラスファイバー又は導光板等のライトガイド（１０）が設けられる。ライトガイド（１０）の他端（１０ｂ）又は他方の主面（１０ｄ）には光反射面が形成される。チップＬＥＤ（８）から照射され且つ蛍光カバー（９）内で波長変換された光はライトガイド（１０）の一端（１０ａ）からライトガイド（１０）内に受光され、ライトガイド（１０）の他端（１０ｂ）又は一方の主面（１０ｃ）から照射される。
【００１７】
【発明の効果】
前記のように、本発明では、蛍光カバーが樹脂封止体に密着して装着されるので、装着後に振動等の外力が蛍光カバーに加えられても容易には離脱しない。蛍光体は蛍光カバーに添加され、樹脂封止体中には添加されないので、樹脂封止体内では蛍光体による光散乱が生じない。また、十分に肉薄なフィルム状の蛍光カバー内では蛍光体による光散乱は比較的小さい。このため、ヘッダ及び樹脂封止体のレンズ部の形状等によって所望の光指向性が得られ、波長変換に伴う輝度の低下を最小限に抑制することができる。蛍光カバーを装着し又は交換することにより容易に異なる波長の光を取り出すことができる。市販の半導体発光素子に蛍光カバーを被着できるので、半導体発光装置を安価に製造することができる。また、複数種の蛍光体を蛍光カバーに混合することにより所望の混合色又は中間色の光を取り出すことができる。
【図面の簡単な説明】
【図１】 発光ダイオードに適用した本発明による半導体発光装置の断面図
【図２】 蛍光カバーを除去した本発明による半導体発光装置の断面図
【図３】 蛍光カバーの断面図
【図４】 蛍光カバーの横断面図
【図５】 チップＬＥＤに適用した本発明の他の実施例を示す断面図
【図６】 従来の発光ダイオードの断面図
【符号の説明】
（１）・・ヘッダ、 （２）・・第１のリード、 （３）・・リード細線接続部、 （４）・・第２のリード、 （５）・・半導体発光素子、 （６）・・リード細線、 （７）・・樹脂封止体、 （７ａ）・・封止部、 （７ｂ）・・レンズ部、 （８）・・ＬＥＤ、 （９）・・蛍光カバー、 （９ａ）・・カバー本体、 （９ｂ）・・球面部、 （９ｃ）・・開口部、 （９ｄ）・・内面、[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a semiconductor light-emitting device, and more particularly to a semiconductor light-emitting device that radiates light emitted from a light-emitting element after wavelength conversion.
[0002]
[Prior art]
The conventional semiconductor light emitting device shown in FIG. 6 has a first lead (2) provided with a dish-like support (header) (1) at one end, and a lead wire connecting portion (metal post) (3) at one end. A second lead (4) provided, a semiconductor light emitting element (5) fixed to the header (1) with an adhesive, and two electrodes (not shown) formed on the upper surface of the semiconductor light emitting element (5) Two lead wires (6) for electrically connecting the metal posts (3) and the like, and the semiconductor light emitting element (5), the lead wires (6), the first lead (2) and the second lead And a resin sealing body (7) covering one end side of the lead (4). The light emission color of the semiconductor light emitting device is determined by the specific light emission wavelength of the semiconductor light emitting element (5). The colors are red, green and blue, respectively. If a GaAs semiconductor light emitting element is used, an infrared light emitting semiconductor light emitting device can be obtained.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, it has been desired to realize a semiconductor light emitting device capable of emitting light of mixed colors such as red, green, and blue intermediate colors or white. In order to realize an intermediate color or a mixed color, a phosphor that emits fluorescence when excited by light emission of the semiconductor light emitting element is added to the resin sealing body (7), and the wavelength of the light of the semiconductor light emitting element (5) is converted to a resin. A semiconductor light-emitting device that radiates outside the sealing body (7) has been proposed. The semiconductor light emitting device in which the phosphor is mixed in the resin encapsulant (7) can obtain a desired emission color by converting the wavelength of light, but has a drawback in that the emission luminance is remarkably reduced by light scattering by the phosphor. Therefore, an object of the present invention is to provide a semiconductor light emitting device that can obtain a desired light emission color with high luminance.
[0004]
[Means for Solving the Problems]
The semiconductor light emitting device according to the present invention includes a plurality of leads (2) (4), a semiconductor light emitting element (5) electrically connected between the plurality of leads (2) (4), and a plurality of leads (2). A resin sealing body (7) for sealing one end of (4) and the semiconductor light emitting element (5), and an opening (9c) provided at one end and an inner surface having the same shape as the resin sealing body (7). And a translucent fluorescent cover (9) attached to the resin sealing body (7). The fluorescent cover (9) has elasticity and is formed by injection molding of a resin including a translucent resin base material and a phosphor added to the resin base material and including the phosphor. The resin sealing body (7) includes a cylindrical sealing portion (7a) and a substantially hemispherical lens portion (7b) integrally formed with one end of the sealing portion (7a). Yes. The fluorescent cover (9) includes a cylindrical cover body (9a) having a shape matching the sealing portion (7a) of the resin sealing body (7), and a lens portion (7b) of the resin sealing body (7). And a spherical surface portion (9b) integrally formed in the cover main body (9a) in a hemispherical shape. The cover main body (9a) and the spherical surface portion (9b) are respectively formed of the resin sealing body (7). Since the fluorescent cover (9) is attached in close contact with the resin sealing body (7) in close contact with the sealing portion (7a) and the lens portion (7b), external force such as vibration is applied to the fluorescent cover (9) after attachment. Although the fluorescent cover (9) is not easily detached from the resin encapsulant (7) even if added, the fluorescent cover (9) can be easily replaced to extract light of different wavelengths. The light irradiated from the semiconductor light emitting element (5) passes through the resin sealing body (7), is wavelength-converted by the phosphor in the fluorescent cover (9), and is taken out of the fluorescent cover (9). Since the phosphor in the resin substrate of the fluorescent cover (9) is excited by the light irradiated from the semiconductor light emitting element (5) through the resin sealing body (7), the commercially available semiconductor light emitting element is used by the fluorescent cover (9). Light having a wavelength different from that generated from (5) can be extracted.
[0005]
In the embodiment of the present invention, the fluorescent cover (9) attached to the resin sealing body (7) may be in close contact with the resin sealing body (7) with a translucent adhesive.
[0006]
A plurality of small holes for removing air between the resin sealing body (7) and the fluorescent cover (9) are formed in the fluorescent cover (9).
[0007]
The chip LED (8) constitutes a semiconductor light-emitting device, and light emitted from the chip LED (8) and wavelength-converted in the fluorescent cover (9) is received by one end (10a) of the light guide (10), By irradiating from the other end (10b) or one main surface (10c) of the guide (10), it is possible to take out light whose wavelength has been converted at a desired position.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a semiconductor light emitting device according to the present invention applied to a light emitting diode will be described below with reference to FIGS. In FIG. 1 to FIG. 5, the same parts as those shown in FIG. As shown in FIG. 1, the semiconductor light emitting device according to the present embodiment surrounds an LED (semiconductor light emitting diode) (8) having a lens-shaped resin sealing body (7) and the resin sealing body (7). A fluorescent cover (9). A resin sealing body (7) formed by a well-known transfer molding method or casting method has a cylindrical sealing portion (7a), and is substantially formed integrally with the sealing portion (7a) on one end side thereof. Hemispherical lens portion (7b). The resin sealing body (7) is mainly composed of, for example, an epoxy resin having optical transparency, and a scattering agent made of silica or the like is mixed therein, and some pigments of non-light emitting substances may be added. The LED (8) shown in FIG. 2 has basically the same structure as the conventional semiconductor light emitting device shown in FIG. 6, but no phosphor is added to the resin encapsulant (7). As the semiconductor light emitting element (5) of the LED (8) shown in FIG. 2, a GaN-based semiconductor light emitting element that produces a blue emission color having an emission peak in the vicinity of 430 to 480 nm is used. In the fluorescent cover (9), for example, a fluorescent material that is excited by light emission of the semiconductor light emitting element (5) and emits fluorescence is added to a resin base material. The resin base material is selected from translucent polyester resin, acrylic resin, urethane, nylon, silicone resin, vinyl chloride, polystyrene, bakelite, CR39 (acrylic glycol carbonate resin) and the like. Urethane, nylon, and silicone resin impart a certain degree of elasticity to the fluorescent cover (9), and therefore can be easily mounted on the resin sealing body (7). The phosphor is a substance that emits visible light having a wavelength different from the wavelength of the light while absorbing the light when irradiated with the light. In general, the phosphor includes a base, an activator, and a flux. For the substrate, oxides such as rare earth elements such as zinc, cadmium, magnesium, silicon, and yttrium, sulfides, silicates, vanadates, and the like are suitable, and those of copper, iron, and nickel are unsuitable. The activator is silver, copper, manganese, chromium, eurobium, zinc, aluminum, lead, phosphorus, arsenic, gold or the like, and a trace amount of about 0.001% to several percent is generally used. As the flux, sodium chloride, potassium chloride, magnesium carbonate and barium chloride are usually used. In addition to the inorganic phosphor, organic phosphors such as fluorescein, eosin, and oils (mineral oil) can be used.
[0009]
As shown in FIG. 3, the fluorescent cover (9) includes a cylindrical cover main body (9a) and a spherical surface portion (9b) integrally formed in the cover main body (9a). The cylindrical cover body (9a) has a shape that matches the sealing portion (7a) of the resin sealing body (7), and the spherical surface portion (9b) matches the lens portion (7b) of the resin sealing body (7). Have a shape to The inner surface (9d) of the fluorescent cover (9) has the same shape as the resin sealing body (7), and the fluorescent cover (9) is passed through the opening (9c) provided at one end of the cover main body (9a). When attached to the resin sealing body (7), the inner surface (9d) of the fluorescent cover (9) is in close contact with the outer surface of the resin sealing body (7). That is, the cover main body (9a) and the spherical surface portion (9b) of the fluorescent cover (9) are mounted in close contact with the sealing portion (7a) and the lens portion (7b) of the resin sealing body (7), respectively. Even if an external force such as vibration is applied to the fluorescent cover (9) after the mounting, the fluorescent cover (9) is not easily detached from the resin sealing body (7).
[0010]
In this example, an emission wavelength having an emission peak near 500 to 600 nm is obtained by being excited by a wavelength near 430 to 480 nm, and for example, the base is zinc sulfide and cadmium sulfide, the activator is copper, the flux is barium chloride, and A phosphor composed of potassium chloride is added.
[0011]
In the semiconductor light emitting device of the present invention shown in FIG. 1, a blue light emitting GaN-based semiconductor light emitting element having an emission peak in the vicinity of 430 to 480 nm is used as the semiconductor light emitting element (5), and light is emitted from the semiconductor light emitting element (5). Light is irradiated to the phosphor in the phosphor cover (9) through the resin sealing body (7) to excite the phosphor. For this reason, the wavelength of the phosphor in the fluorescent cover (9) is converted into white light having a light emission peak in the vicinity of 500 to 600 nm and can be taken out of the fluorescent cover (9). In this case, since the phosphor is added to the fluorescent cover (9) and not added to the resin sealing body (7), light scattering by the phosphor does not occur in the resin sealing body (7). Also, light scattering by the phosphor is relatively small in the sufficiently thin film-like fluorescent cover (9). For this reason, desired light directivity is obtained by the shape of the lens part (7b) of the header (1) and the resin sealing body (7), etc., and a decrease in luminance associated with wavelength conversion can be minimized. .
[0012]
The fluorescent cover (9) can be completed relatively easily when it is formed into a predetermined shape by injection molding of a resin containing a phosphor and then attached to the resin sealing body (7).
[0013]
In the present embodiment, the following effects can be obtained.
<1> Since the phosphor is added to the fluorescent cover (9) and not added to the resin sealing body (7), light scattering by the phosphor does not occur in the resin sealing body (7).
<2> Light scattering by the phosphor is relatively small in the sufficiently thin film-like fluorescent cover (9). For this reason, desired light directivity is obtained by the shape of the lens part (7b) of the header (1) and the resin sealing body (7), etc., and a decrease in luminance associated with wavelength conversion can be minimized. .
<3> The fluorescent cover (9) can extract light having a wavelength different from the light generated from the commercially available semiconductor light emitting device (5).
<4> The fluorescent cover (9) can be easily replaced to extract light of different wavelengths.
<5> Light of a desired mixed color or intermediate color can be extracted by mixing a plurality of types of phosphors in the fluorescent cover (9).
<6> Since the fluorescent cover (9) is mounted in close contact with the resin sealing body (7), the fluorescent cover (9) is sealed with resin even if an external force such as vibration is applied to the fluorescent cover (9) after mounting. It is not easily detached from the stop (7).
<7> Since the fluorescent cover (9) can be attached to the commercially available semiconductor light emitting element (5), the semiconductor light emitting device can be manufactured at low cost.
[0014]
In the embodiment of the present invention, the phosphor that is excited by light having a relatively small emission wavelength and emits light having a relatively large emission wavelength is used. However, it is excited by light having a relatively large emission wavelength. Alternatively, a phosphor that emits light having a relatively small emission wavelength may be used. In this case, it is possible to obtain a semiconductor light emitting device having a relatively small emission wavelength and using a semiconductor light emitting element having a large emission wavelength.
[0015]
A small amount of phosphor that assists light conversion by the phosphor in the fluorescent cover (9) may also be added to the resin sealing body (7) of the LED (8). However, if a phosphor is added to the resin encapsulant (7), the light emission luminance is lowered. Therefore, it is desirable to add the phosphor only to the phosphor cover (9) as in the embodiment. You may mix a fluorescent sensitizer with a fluorescent substance in a fluorescent cover (9).
[0016]
The fluorescent cover (9) may be partially attached only to the lens portion (7b), not the entire resin sealing body (7). In order to prevent an air layer from being formed between the resin sealing body (7) and the fluorescent cover (9), a plurality of small holes may be formed in the fluorescent cover (9). In this case, it is possible to observe a mixed color of light converted in wavelength by the phosphor and light from the light emitting element (5) emitted through the hole. A light-transmitting adhesive is filled between the resin sealing body (7) and the fluorescent cover (9) to remove the air layer between the resin sealing body (7) and the fluorescent cover (9). The luminous efficiency may be improved. For example, as shown in FIG. 5, this invention is applicable also to chip | tip LED (8). In this case, the wiring conductor printed on the substrate (11) corresponds to the lead, and the fluorescent cover (9) is attached to the resin sealing body (7). Opposite the fluorescent cover (9), a light guide (10) such as a glass fiber or a light guide plate is provided. A light reflecting surface is formed on the other end (10b) or the other main surface (10d) of the light guide (10). The light emitted from the chip LED (8) and wavelength-converted in the fluorescent cover (9) is received in the light guide (10) from one end (10a) of the light guide (10), and other than the light guide (10). It irradiates from an end (10b) or one main surface (10c).
[0017]
【The invention's effect】
As described above, in the present invention, since the fluorescent cover is attached in close contact with the resin sealing body, even if an external force such as vibration is applied to the fluorescent cover after the attachment, the fluorescent cover is not easily detached. Since the phosphor is added to the phosphor cover and not added to the resin sealing body, light scattering by the phosphor does not occur in the resin sealing body. Further, light scattering by the phosphor is relatively small in a sufficiently thin film-like fluorescent cover. For this reason, desired light directivity can be obtained depending on the shape of the header and the lens portion of the resin sealing body, etc., and a decrease in luminance associated with wavelength conversion can be minimized. By attaching or replacing the fluorescent cover, light of different wavelengths can be easily extracted. Since a fluorescent cover can be attached to a commercially available semiconductor light emitting element, a semiconductor light emitting device can be manufactured at low cost. Further, by mixing a plurality of types of phosphors in the fluorescent cover, light of a desired mixed color or intermediate color can be extracted.
[Brief description of the drawings]
1 is a cross-sectional view of a semiconductor light-emitting device according to the present invention applied to a light-emitting diode. FIG. 2 is a cross-sectional view of a semiconductor light-emitting device according to the present invention with a fluorescent cover removed. FIG. 3 is a cross-sectional view of a fluorescent cover. FIG. 5 is a cross-sectional view showing another embodiment of the present invention applied to a chip LED. FIG. 6 is a cross-sectional view of a conventional light emitting diode.
(1) ・ ・ Header, (2) ・ ・ First lead, (3) ・ Lead thin wire connection part, (4) ・ ・ Second lead, (5) ・ ・ Semiconductor light emitting element, (6) ・・ Lead wire, (7) ・ ・ Resin sealing body, (7a) ・ ・ Sealing part, (7b) ・ ・ Lens part, (8) ・ ・ LED, (9) ・ ・ Fluorescent cover, (9a) ・-Cover body (9b)-Spherical surface part (9c)-Opening part (9d)-Inner surface,
Claims (4)
前記蛍光カバーは、弾力性を有し、透光性の樹脂基材と、該樹脂基材中に添加された蛍光体とを備え且つ蛍光体を含む樹脂の射出成形により形成され、
前記樹脂封止体は、円柱状の封止部と、該封止部の一端側にこれと一体に形成されたほぼ半球状のレンズ部とを備え、
前記蛍光カバーは、前記樹脂封止体の前記封止部に合致する形状を有する円筒状のカバー本体と、前記樹脂封止体の前記レンズ部に合致する形状で前記カバー本体に一体に半球状に形成された球面部とを備え、前記カバー本体及び前記球面部は、それぞれ前記樹脂封止体の前記封止部及び前記レンズ部に密着し、
前記半導体発光素子から照射した光は、前記樹脂封止体を通り前記蛍光カバー中の前記蛍光体によって波長変換されて前記蛍光カバーの外部に取り出されることを特徴とする半導体発光装置。A plurality of leads, a semiconductor light emitting element electrically connected between the plurality of leads, a resin sealing body for sealing one end of the plurality of leads and the semiconductor light emitting element, and an opening at one end. And in a semiconductor light emitting device comprising a translucent fluorescent cover that has an inner surface of the same shape as the resin sealing body and is attached to the resin sealing body,
The fluorescent cover has elasticity, is formed by injection molding of a resin that includes a translucent resin base material and a phosphor added in the resin base material and includes the phosphor,
The resin sealing body includes a cylindrical sealing portion and a substantially hemispherical lens portion formed integrally with the sealing portion on one end side of the sealing portion,
The fluorescent cover includes a cylindrical cover body having a shape that matches the sealing portion of the resin sealing body, and a hemispherical shape integrally with the cover body in a shape that matches the lens portion of the resin sealing body. And the cover body and the spherical portion are in close contact with the sealing portion and the lens portion of the resin sealing body, respectively.
The light emitted from the semiconductor light emitting element passes through the resin sealing body, is wavelength-converted by the phosphor in the fluorescent cover, and is extracted to the outside of the fluorescent cover.
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| JP2001167658A JP3715904B2 (en) | 2001-06-04 | 2001-06-04 | Semiconductor light emitting device |
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