JP2004311822A - Purplish red light emitting diode - Google Patents

Purplish red light emitting diode Download PDF

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Publication number
JP2004311822A
JP2004311822A JP2003105250A JP2003105250A JP2004311822A JP 2004311822 A JP2004311822 A JP 2004311822A JP 2003105250 A JP2003105250 A JP 2003105250A JP 2003105250 A JP2003105250 A JP 2003105250A JP 2004311822 A JP2004311822 A JP 2004311822A
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Prior art keywords
emitting diode
light
red
light emitting
violet
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JP2003105250A
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Japanese (ja)
Inventor
Hsing Chen
陳興
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Solidlite Corp
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Solidlite Corp
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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
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a purplish red light emitting diode capable of obtaining purplish red light or pink light. <P>SOLUTION: A fluorescent layer consisting of red fluorescent powder whose components are 6MgO-As<SB>2</SB>O<SB>5</SB>:Mn or 3.5MgO-0.5MgF<SB>2</SB>-GeO<SB>2</SB>:Mn is applied to purple light emitting diode crystal grains of about 405-430nm wavelength to coat the purple light emitting diode crystal grains, a red fluorescent layer is excited by light of about 405-430nm wavelength generated from the purple light emitting diode crystal grains to generate red light of about 650nm wavelength, and purplish red light is obtained by synthesizing red light and purple light originally generated from the purple light emitting diode crystal grains. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、発光ダイオードに関し、特に赤紫色（或いは桃色）の光線を発生させる発光ダイオードに関する。
【０００２】
【従来の技術】
発光ダイオードは、従来の照明用の電球などに比して、電力を節約でき、使用寿命が長く、環境保護の面などからも優れている。仮に、明るさを増すことができ、コストが低下すれば、将来は半導体を応用した照明が実現することも可能である。
【０００３】
現在の発光ダイオードは、可視光線の範囲内において赤、オレンジ色、赤オレンジ色、黄色、黄緑色、緑色、青、紫などの色を表現することができる。但し、その他混合された色を選択することは未だになされていない。異なる波長の色の発光ダイオードを開発することは、目下発光ダイオード研究における重要な課題の一つとなっている。
【０００４】
従来、２つ以上の色を混合する場合は、２つ以上の異なる色の粒状の発光体を一つにパッケージして光源とする。但し、かかる方法は、パッケージの工程において、ボンディングが複雑になり、かつ異なる色の発光体の材料が異なる場合には、必要とする駆動電圧も異なる。よって、設計時に、必ず個々の粒状の発光体に異なる駆動電圧を加えて明るさと色を調節しなければならないという欠点があった。
【０００５】
最近の技術では、単一の発光体結晶粒で多用な色彩を発生させることが可能になった。即ち、結晶粒の表面に蛍光粉の層を形成する。発光体の結晶粒が発する光線で蛍光粉の層を励起すると、蛍光粉の層は他の色彩の光線を発光する。このように蛍光粉から発生する光と本来の発光体結晶粒から発光する光線の色とを混合させると、新しい（多様な波長の）色の光線を発生させることができる。これは、日亜化学工業株式会社の所有する白色発光ダイオードに関する特許（台湾特許出願第０８６１１０７３９号）などに開示される技術であって、青色ダイオード（波長約４６０ｎｍ）に黄色（ＹＡＧ）の蛍光粉を塗布して、長い波長の黄色の光線（約５６０ｎｍ）を発光させる。図２、図３に開示するように、励起するための光線のスペクトル（光吸収スペクトル）のピーク値は約４６０ｎｍである。かかる波長の青色の光線によって黄色（ＹＡＧ）の蛍光粉を励起して黄色の光線（波長約５６０ｎｍ）を発生させ、黄色と青色が交互に補う原理を利用し、白色光線を発光する発光ダイオードを得る。
【０００６】
【発明が解決しようとする課題】
この発明は、携帯電話機、パーソナル・ディジタル・アシスト（ＰＤＡ）、もしくは其の他電子装置の液晶表示装置の光源或いは装飾、照明などに新規で特殊な色の光線を賦与し、広範囲に応用することのできる発光ダイオードを提供することを課題とする。
【０００７】
また、この発明は、赤紫色もしくは桃色の光線を提供することのできる発光ダイオードを課題とする。
【０００８】
【課題を解決するための手段】
そこで、本発明者は従来の技術に見られる欠点に鑑みて鋭意研究を重ねた結果、波長が約４０５〜４３０ｎｍの紫色発光ダイオード結晶粒に、成分が６ＭｇＯ・Ａｓ２Ｏ ５：Ｍｎか、もしくは３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎである赤色蛍光粉によってなる蛍光層を塗布し、該紫色発光ダイオード結晶粒から発生する波長が約４０５〜４３０ｎｍの光線によって該赤色蛍光層を励起して波長が約６５０ｎｍの赤色光線を発生させ、該赤色光線と、紫色発光ダイオード結晶粒から本来発生する紫色とを合成させて赤紫色の光線を得る発光ダイオードの構造によって課題を解決できる点に着眼し、かかる知見に基づいて本発明を完成させた。
【０００９】
以下、この発明について具体的に説明する。
請求項１に記載する赤紫色発光ダイオードは、波長が約４０５〜４３０ｎｍの紫色発光ダイオード結晶粒と、
成分が６ＭｇＯ・Ａｓ２Ｏ ５：Ｍｎか、もしくは３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎである赤色蛍光粉によってなり、該紫色発光ダイオード結晶粒を被覆するように塗布される蛍光層とを含んでなり、
該紫色発光ダイオード結晶粒から発生する波長が約４０５〜４３０ｎｍの光線によって該赤色蛍光層を励起して波長が約６５０ｎｍの赤色光線を発生させ、該赤色光線と、紫色発光ダイオード結晶粒から本来発生する紫色とを合成させて赤紫色の光線を得る。
【００１０】
請求項２に記載とする赤紫色発光ダイオードは、請求項１における赤色蛍光層に、成分である赤色蛍光粉を添加する量によって、発生する光線の色が赤色に近いか、紫色に近いかを調整する。
【００１１】
請求項３に記載する発光ダイオードは、請求項１における紫色発光ダイオードがパッケージしてランプ型か、或いは表面実装型（ＳＭＤ）にされる。
【００１２】
【発明の実施の形態】
この発明は、赤紫色、或いは桃色の光線を発光する発光ダイオードを提供するものであって、波長が約４０５〜４３０ｎｍの紫色発光ダイオード結晶粒と、成分が６ＭｇＯ・Ａｓ２Ｏ ５：Ｍｎか、もしくは３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎである赤色蛍光粉によってなり、該紫色発光ダイオード結晶粒を被覆するように塗布される蛍光層とを含んでなる。
かかる赤紫色発光ダイオードの構造と特徴を詳述するために具体的な実施例を挙げ、図を参照して以下に説明する。
【００１３】
【実施例】
図１にランプ型の発光ダイオードを開示する。紫色の発光ダイオード結晶粒（１）（波長４０５−４３０ｎｍ）は、リード支持フレーム（２）に固定してリード（５）を結線する。発光ダイオード結晶粒（１）上には、赤色の蛍光粉によって蛍光層（４）を形成する。該発光ダイオード結晶粒（１）を被覆する蛍光層（４）は、６ＭｇＯ・Ａｓ２Ｏ ５：Ｍｎ、もしくは３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎを成分とする赤色の蛍光粉を計量して適量を透明ゲルと混合し、蛍光ゲルを得て、スポット方式で直接、或いは間接的に発光ダイオード結晶粒（１）上に塗布して形成する。さらに、透明樹脂（３）を注入してパッケージ工程を完成させる。この場合、ランプ型、或いは表面実装型（ＳＭＤ）のいずれにしてもよい。
【００１４】
図４、図５のスペクトル図に開示するように、赤色の蛍光粉は紫色の光線の励起によって波長が約６５０ｎｍの赤色の光線を発生する。励起によって発生した赤色の光線は、発光ダイオード結晶粒（１）から発生する本来の紫色の光線と混合し、赤紫色（或いは桃色）の光線となる。
【００１５】
図６に、この発明による赤紫発光ダイオードの発光する光線のスペクトルを開示する。図６から明らかなように、紫色の光線のピーク値は約４０５〜４３０ｎｍであり、紫色の光線で赤色の蛍光粉を励起して発生する赤色の光線のピーク値は約６５０〜６６０ｎｍである。よって、製造過程において添加する蛍光粉の量によって発生する光線の色を紫色に近づけるか、赤色に近づけるかを制御することができる。
【００１６】
目下、発光体結晶粒によって蛍光粉を励起する方法には、例えば日亜化学工業株式会社の所有する技術に見られるように青色ダイオードで黄色（ＹＡＧ）蛍光粉を励起して二種類の波長を有する白色光線を得るものか、もしくは紫外線発光ダイオードで赤、青、緑色の混合された蛍光粉を励起して白色光線を得るものなどがある。この発明においては、特に紫色の発光ダイオード結晶粒から発生する光線で赤色の蛍光粉を励起して赤紫色の光線を発光する発光ダイオードを得る。即ち、可視光線の波長の範囲にある光線で励起するため、従来の技術に見られるように、パッケージに用いる樹脂が紫外線の長期にわたる照射を受けて劣化する現象が発生することがなく、新規な色彩の光線が得られる。
【００１７】
赤紫色の光線を発生させる発光ダイオードは、光線の色彩が新規であって、例えば携帯電話機、パーソナル・ディジタル・アシスト（ＰＤＡ）、バックライトの光源、発光体を具えるアクセサリー、パイロットランプなどの指示灯などと応用範囲をさらに多様化することができる。また、かかる特殊な色彩は、一部のキャラクターグッズの色彩に合わせて用いることによって、女性層、もしくは若い人たちの消費者を対象とした新商品に応用することができる。
【発明の効果】
【００１８】
この発明によれば、赤紫色或いは桃色の光線を照射する発光ダイオードが得られ、応用する製品の範囲をさらに広げる効果を有する。
【００１９】
また、この考案によれば、従来の技術に見られるように、パッケージに用いる樹脂が紫外線の長期にわたる照射を受けて劣化する現象が発生することがなく、使用寿命を延長させる効果を具える。
【図面の簡単な説明】
【図１】この発明による赤紫色発光ダイオードの実装構造を表わす断面図である。
【図２】日亜化学工業株式会社の黄色ＹＡＧ蛍光粉に係る励起スペクトルを表わすグラフである。
【図３】日亜化学工業株式会社の黄色ＹＡＧ蛍光粉に係る発光スペクトルを表わすグラフである。
【図４】この発明における赤色蛍光粉の励起スペクトルと、赤色発光スペクトルを表わすグラフである。
【図５】この発明における他の赤色蛍光粉の励起スペクトルと、赤色発光スペクトルを表わすグラフである。
【図６】この発明による発光ダイオードの紫、赤色光線の発光スペクトルを表わすグラフである。
【符号の説明】
１ 発光ダイオード結晶粒
２ リード支持フレーム
３ 透明樹脂
４ 蛍光層
５ リード[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light emitting diode, and more particularly, to a light emitting diode that generates a red-violet (or pink) light beam.
[0002]
[Prior art]
Light-emitting diodes can save power, have a longer service life, and are superior in terms of environmental protection and the like, compared to conventional lighting bulbs and the like. If the brightness can be increased and the cost can be reduced, lighting using a semiconductor can be realized in the future.
[0003]
Current light emitting diodes can express colors such as red, orange, red-orange, yellow, yellow-green, green, blue, and violet in the range of visible light. However, other mixed colors have not been selected yet. Developing light-emitting diodes of different wavelengths has become one of the important issues in light-emitting diode research at present.
[0004]
Conventionally, when two or more colors are mixed, two or more granular light-emitting bodies of different colors are packaged into one to form a light source. However, in this method, when the bonding becomes complicated in the package process and the materials of the light-emitting bodies of different colors are different, the required driving voltage is also different. Therefore, at the time of design, there is a drawback that brightness and color must be adjusted by applying different drive voltages to individual granular light-emitting members.
[0005]
Recent technology has made it possible to generate a variety of colors with a single phosphor crystal grain. That is, a layer of the fluorescent powder is formed on the surface of the crystal grain. When the phosphor powder layer is excited by the light emitted from the crystal grains of the illuminant, the phosphor powder layer emits light of another color. By mixing the light emitted from the fluorescent powder with the color of the light emitted from the original light emitting crystal grains, light of a new color (having various wavelengths) can be generated. This is a technique disclosed in a patent for a white light emitting diode owned by Nichia Chemical Industry Co., Ltd. (Taiwan Patent Application No. 086110739). A blue diode (wavelength: about 460 nm) and a yellow (YAG) fluorescent powder are used. To emit long-wavelength yellow light (about 560 nm). As disclosed in FIGS. 2 and 3, the peak value of the spectrum of the light beam for excitation (light absorption spectrum) is about 460 nm. The blue (YAG) fluorescent powder is excited by the blue light having such a wavelength to generate a yellow light (wavelength: about 560 nm). obtain.
[0006]
[Problems to be solved by the invention]
The present invention is to provide a light source of a liquid crystal display device of a portable telephone, a personal digital assistant (PDA), or other electronic devices with a light beam of a new and special color, and to apply it to a wide range of applications. It is an object of the present invention to provide a light emitting diode that can be used.
[0007]
Another object of the present invention is to provide a light-emitting diode capable of providing a red-violet or pink light beam.
[0008]
[Means for Solving the Problems]
The inventor of the present invention has conducted intensive studies in view of the drawbacks found in the prior art, and as a result, has found that the violet light-emitting diode crystal grains having a wavelength of about 405 to 430 nm have a component of 6MgO · As 2 O 5 : Mn or 3.5MgO · 0.5MgF 2 · GeO 2: fluorescence layer coating made by the red fluorescent powder is Mn, excite the red phosphor layer wavelengths generated from該紫color light emitting diode crystal grains by rays of about 405~430nm Then, a red light having a wavelength of about 650 nm is generated, and the red light and the purple light originally generated from the violet light emitting diode crystal grains are combined to obtain a red-violet light. The present invention was completed based on such findings.
[0009]
Hereinafter, the present invention will be described specifically.
The red-violet light-emitting diode according to claim 1, wherein the wavelength is about 405 to 430 nm.
A fluorescent layer composed of red fluorescent powder whose component is 6MgO.As 2 O 5 : Mn or 3.5MgO.0.5MgF 2 .GeO 2 : Mn, and is applied so as to cover the purple light emitting diode crystal grains. And comprising
The red phosphor layer is excited by a light beam having a wavelength of about 405 to 430 nm generated from the violet light emitting diode crystal to generate a red light beam having a wavelength of about 650 nm. To obtain a red-violet light beam.
[0010]
The red-violet light emitting diode according to claim 2 determines whether the color of the generated light is close to red or close to purple depending on the amount of the red fluorescent powder as a component added to the red fluorescent layer according to claim 1. adjust.
[0011]
According to a third aspect of the present invention, the violet light emitting diode according to the first aspect is packaged to be a lamp type or a surface mount type (SMD).
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention provides a light emitting diode that emits red-violet or pink light, and includes a purple light-emitting diode crystal having a wavelength of about 405 to 430 nm and a component of 6MgO · As 2 O 5 : Mn. Alternatively, a phosphor layer made of red phosphor powder of 3.5MgO.0.5MgF 2 .GeO 2 : Mn, which is applied so as to cover the violet light emitting diode crystal grains.
A specific embodiment will be described in detail to explain the structure and characteristics of the red-violet light emitting diode, and will be described below with reference to the drawings.
[0013]
【Example】
FIG. 1 discloses a lamp-type light emitting diode. The purple light emitting diode crystal grains (1) (wavelength: 405 to 430 nm) are fixed to the lead support frame (2) to connect the leads (5). A fluorescent layer (4) is formed on the light emitting diode crystal grains (1) with red fluorescent powder. The fluorescent layer (4) covering the light emitting diode crystal grains (1) is made of red fluorescent powder containing 6MgO.As 2 O 5 : Mn or 3.5MgO.0.5MgF 2 .GeO 2 : Mn as a component. An appropriate amount is weighed and mixed with the transparent gel to obtain a fluorescent gel, which is directly or indirectly applied to the light emitting diode crystal grains (1) by a spot method to form. Further, the packaging process is completed by injecting the transparent resin (3). In this case, either a lamp type or a surface mount type (SMD) may be used.
[0014]
As disclosed in the spectrum diagrams of FIGS. 4 and 5, the red fluorescent powder generates a red light having a wavelength of about 650 nm by excitation of a purple light. The red light beam generated by the excitation is mixed with the original purple light beam generated from the light-emitting diode crystal grains (1) to become a red-violet (or pink) light beam.
[0015]
FIG. 6 discloses the spectrum of light emitted from the red-violet light emitting diode according to the present invention. As apparent from FIG. 6, the peak value of the purple light is about 405 to 430 nm, and the peak value of the red light generated by exciting the red fluorescent powder with the purple light is about 650 to 660 nm. Therefore, it is possible to control whether the color of the generated light approaches purple or red depending on the amount of the fluorescent powder added in the manufacturing process.
[0016]
At present, the method of exciting the fluorescent powder by the phosphor grains includes, for example, exciting a yellow (YAG) fluorescent powder with a blue diode and using two kinds of wavelengths as seen in a technology owned by Nichia Corporation. There is a method for obtaining a white light, or a method for obtaining a white light by exciting a mixed fluorescent powder of red, blue and green with an ultraviolet light emitting diode. In the present invention, a light-emitting diode that emits red-violet light is obtained by exciting red fluorescent powder with a light generated from crystal grains of the light-emitting diode in the purple color. In other words, since the resin used in the package is excited by light rays in the wavelength range of visible light, the phenomenon that the resin used for the package is deteriorated by long-term irradiation of ultraviolet rays does not occur as in the related art. A color light beam is obtained.
[0017]
Light-emitting diodes that emit red-violet light have a new color of light, such as mobile phones, personal digital assistants (PDAs), backlight light sources, luminous accessories, pilot lamps, etc. The application range can be further diversified with lamps and the like. In addition, by using such a special color in accordance with the color of some character goods, it can be applied to a new product targeted at women or young consumers.
【The invention's effect】
[0018]
According to the present invention, a light-emitting diode that emits red-violet or pink light can be obtained, which has the effect of further expanding the range of products to be applied.
[0019]
Further, according to the present invention, as in the prior art, the phenomenon that the resin used for the package is deteriorated by the long-term irradiation of ultraviolet rays does not occur, and the service life can be extended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a mounting structure of a red-violet light emitting diode according to the present invention.
FIG. 2 is a graph showing an excitation spectrum of Nichia Corporation's yellow YAG fluorescent powder.
FIG. 3 is a graph showing an emission spectrum of Nichia Corporation's yellow YAG fluorescent powder.
FIG. 4 is a graph showing an excitation spectrum and a red emission spectrum of a red fluorescent powder according to the present invention.
FIG. 5 is a graph showing an excitation spectrum and a red emission spectrum of another red fluorescent powder according to the present invention.
FIG. 6 is a graph showing emission spectra of violet and red light rays of the light emitting diode according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light-emitting diode crystal grain 2 Lead support frame 3 Transparent resin 4 Fluorescent layer 5 Lead

Claims (3)

波長が約４０５〜４３０ｎｍの紫色発光ダイオード結晶粒と、
成分が６ＭｇＯ・Ａｓ２Ｏ ５：Ｍｎか、もしくは３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎである赤色蛍光粉によってなり、該紫色発光ダイオード結晶粒を被覆するように塗布される蛍光層とを含んでなり、
該紫色発光ダイオード結晶粒から発生する波長が約４０５〜４３０ｎｍの光線によって該赤色蛍光層を励起して波長が約６５０ｎｍの赤色光線を発生させ、該赤色光線と、紫色発光ダイオード結晶粒から本来発生する紫色とを合成させて赤紫色の光線を得ることを特徴とする赤紫色発光ダイオード。A violet light emitting diode crystal having a wavelength of about 405 to 430 nm,
A fluorescent layer composed of red fluorescent powder whose component is 6MgO.As 2 O 5 : Mn or 3.5MgO.0.5MgF 2 .GeO 2 : Mn, and is coated so as to cover the purple light emitting diode crystal grains. And comprising
The red phosphor layer is excited by light having a wavelength of about 405 to 430 nm generated from the violet light emitting diode crystal to generate a red light having a wavelength of about 650 nm. A red-violet light emitting diode characterized in that a red-violet light ray is obtained by synthesizing a red-violet light. 前記赤色蛍光層に、成分である赤色蛍光粉を添加する量によって、発生する光線の色が赤色に近いか、紫色に近いかを調整することを特徴とする請求項１に記載の発光ダイオード。2. The light emitting diode according to claim 1, wherein the color of the generated light is adjusted to be close to red or close to violet by adjusting the amount of the red fluorescent powder, which is a component, to the red fluorescent layer. 3. 紫色発光ダイオードは、パッケージしてランプ型か、或いは表面実装型（ＳＭＤ）にすることを特徴とする請求項１に記載の発光ダイオード。The light emitting diode according to claim 1, wherein the purple light emitting diode is packaged in a lamp type or a surface mount type (SMD).
JP2003105250A 2003-04-09 2003-04-09 Purplish red light emitting diode Pending JP2004311822A (en)

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