JP2007273776A - Color light-emitting diode - Google Patents

Color light-emitting diode Download PDF

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JP2007273776A
JP2007273776A JP2006098338A JP2006098338A JP2007273776A JP 2007273776 A JP2007273776 A JP 2007273776A JP 2006098338 A JP2006098338 A JP 2006098338A JP 2006098338 A JP2006098338 A JP 2006098338A JP 2007273776 A JP2007273776 A JP 2007273776A
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visible light
color
phosphor
led chip
light
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Toshio Shimada
俊男 嶋田
Toshimichi Nakamura
利道 中村
Atsushi Kanbe
篤 神戸
Akihiro Kato
陽弘 加藤
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Okaya Electric Industry Co Ltd
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Okaya Electric Industry Co Ltd
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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
    • 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
    • H01L2224/484—Connecting portions
    • H01L2224/48463—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
    • H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color light-emitting diode capable of easily obtaining not only white light but also high-luminance visible light with a desired color in an LED, having an LED chip for emitting blue-based visible light and a phosphor for converting light emitted by the LED chip to yellowish green-based visible light. <P>SOLUTION: A recess nearly in a funnel shape in which a pore size gradually increases toward the upper part from the bottom surface is provided in a first lead frame 12 for mounting an LED chip, and a reflector 14 is formed with the inner surface of the recess as a reflection surface. An LED chip 16 for emitting blue-based visible light is connected and fixed on the bottom surface of the reflector 14 by die-bonding. The LED chip 16 is coated and sealed with a coating material 22 made of a light-transmitting material. A number of phosphors 24 having pigment to which a red-based pigment 24b is adhered are mixed into the coating material 22 in a dispersed state on the surface of a polychromatic luminous phosphor 24a for radiation, by converting light emitted by the LED chip 16 to two-color visible light of yellowish green-based visible light and red-based visible light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、青色系可視光を発光する発光ダイオードチップ（ＬＥＤチップ）と、該ＬＥＤチップの発光を黄緑色系可視光に変換する蛍光体を備えた発光ダイオードにおいて、白色光のみならず、所望の色の高輝度な可視光を容易に得ることのできるカラー発光ダイオード（カラーＬＥＤ）に関する。   The present invention provides a light emitting diode including a light emitting diode chip (LED chip) that emits blue-based visible light and a phosphor that converts light emitted from the LED chip into yellow-green visible light. The present invention relates to a color light emitting diode (color LED) that can easily obtain high-luminance visible light of the color of the above.

ＬＥＤチップから発せられる青色系可視光と、ＹＡＧ蛍光体等の黄緑色系蛍光体から発せられる黄緑色系可視光とを混色させて白色光を放射することのできるＬＥＤが従来より用いられている。
しかしながら、上記ＬＥＤで得られる白色光には、青色系可視光中の青色成分と、黄緑色系可視光中の黄緑色成分しか含まれていないため、白色光の表現範囲が非常に狭かった。 2. Description of the Related Art Conventionally, LEDs that can emit white light by mixing blue visible light emitted from an LED chip and yellow-green visible light emitted from a yellow-green phosphor such as a YAG phosphor have been used. .
However, since the white light obtained by the LED contains only a blue component in blue visible light and a yellow green component in yellow green visible light, the expression range of white light was very narrow.

例えば、上記ＬＥＤが照明として用いられる場合、赤色成分の入った電球色等の暖色系白色光が消費者には好まれているが、ＬＥＤチップの青色系可視光と黄緑色系蛍光体の黄緑色系可視光とを混色して得られる白色光には赤色成分が含まれていない。
そこで、本出願人は、先に、赤色成分の不足を補うことができるよう、青色系の可視光を発光するＬＥＤチップと、黄緑色系の可視光を発光するＹＡＧ蛍光体と、赤色系の可視光を発光する赤色蛍光体とを備え、上記青色系可視光、黄緑色系可視光、赤色系可視光とを混色させて白色光を放射するよう構成した発光ダイオードを提案した（特開２００４−１５２９９３号）。 For example, when the LED is used as illumination, warm white light such as a light bulb color containing a red component is preferred by consumers, but the blue visible light of the LED chip and the yellowish green phosphor yellow White light obtained by mixing green-based visible light does not contain a red component.
In view of this, the present applicant has previously made an LED chip that emits blue visible light, a YAG phosphor that emits yellow-green visible light, and a red Proposed is a light emitting diode comprising a red phosphor that emits visible light and configured to emit white light by mixing the blue visible light, yellow-green visible light, and red visible light (Japanese Patent Application Laid-Open No. 2004-124). -152993).

この発光ダイオード60は、図６に示すように、発光ダイオードチップ搭載用の第１のリードフレーム62に、その底面から上方に向かって孔径が徐々に拡大する略漏斗形状の凹部を設けると共に該凹部内面を反射面と成してリフレクタ64を形成し、該リフレクタ64の底面に、青色系の可視光を発光する発光ダイオードチップ（以下、ＬＥＤチップと称する）66をダイボンドすることにより、上記第１のリードフレーム62と、ＬＥＤチップ66底面の一方の電極（図示せず）とを電気的に接続している。また、第２のリードフレーム68と、上記ＬＥＤチップ66上面の他方の電極（図示せず）とをボンディングワイヤ70を介して電気的に接続して成る。   As shown in FIG. 6, the light-emitting diode 60 is provided with a substantially funnel-shaped recess whose diameter gradually increases upward from the bottom surface of the first lead frame 62 for mounting the light-emitting diode chip. A reflector 64 is formed with the inner surface as a reflecting surface, and a light emitting diode chip (hereinafter referred to as an LED chip) 66 that emits blue visible light is die-bonded to the bottom surface of the reflector 64, whereby the first The lead frame 62 and one electrode (not shown) on the bottom surface of the LED chip 66 are electrically connected. Further, the second lead frame 68 and the other electrode (not shown) on the upper surface of the LED chip 66 are electrically connected via a bonding wire 70.

上記ＬＥＤチップ66の上面及び側面は、リフレクタ64内に充填された透光性エポキシ樹脂等のコーティング材72によって被覆・封止されている。
また、上記コーティング材72中には、ＬＥＤチップ66の発光を黄緑色系の可視光に変換するＹＡＧ蛍光体73と、ＬＥＤチップ66の発光を赤色系の可視光に変換する赤色系蛍光体74が分散状態で多数混入されている。
さらに、コーティング材72で被覆された上記ＬＥＤチップ66、第１のリードフレーム62の先端部62ａ及び端子部62ｂの上端、第２のリードフレーム68の先端部68ａ及び端子部68ｂの上端は、先端に凸レンズ部76を有する透光性樹脂材78によって被覆・封止されている。 The upper and side surfaces of the LED chip 66 are covered and sealed with a coating material 72 such as a translucent epoxy resin filled in the reflector 64.
Further, in the coating material 72, a YAG phosphor 73 that converts light emitted from the LED chip 66 into yellowish green visible light, and a red phosphor 74 that converts light emitted from the LED chip 66 into red visible light. Are mixed in a dispersed state.
Further, the LED chip 66 covered with the coating material 72, the top ends 62a and 62b of the first lead frame 62, the top ends 68a and 68b of the second lead frame 68 are the top ends. It is covered and sealed with a translucent resin material 78 having a convex lens portion 76.

而して、上記第１のリードフレーム62及び第２のリードフレーム68を介してＬＥＤチップ66に電圧が印加されると、ＬＥＤチップ66が発光して青色系可視光が放射される。また、ＬＥＤチップ66の発光を受けてＹＡＧ蛍光体73から黄緑色系可視光が放射されると共に、赤色系蛍光体74から赤色系可視光が放射される。
そして、ＬＥＤチップ66から放射された青色系可視光、ＹＡＧ蛍光体73から放射された黄緑色系可視光、赤色系蛍光体74から放射された赤色系可視光が混色することにより白色光が得られ、該白色光が透光性樹脂材78の凸レンズ部76によって集光されて外部へ放射されるようになっている。 Thus, when a voltage is applied to the LED chip 66 through the first lead frame 62 and the second lead frame 68, the LED chip 66 emits light and blue visible light is emitted. Further, yellow-green visible light is emitted from the YAG phosphor 73 upon receiving light emitted from the LED chip 66, and red visible light is emitted from the red phosphor 74.
The blue-colored visible light emitted from the LED chip 66, the yellow-green visible light emitted from the YAG phosphor 73, and the red-colored visible light emitted from the red phosphor 74 are mixed to obtain white light. The white light is collected by the convex lens portion 76 of the translucent resin material 78 and emitted to the outside.

上記ＬＥＤ60は、ＹＡＧ蛍光体73と共に赤色系蛍光体74を備えているので、上記赤色系蛍光体74から放射される赤色系可視光によって、赤色成分の不足を補うことができ、暖色系白色光を得ることができる。
特開２００４−１５２９９３号 Since the LED 60 includes the red phosphor 74 together with the YAG phosphor 73, the red visible light emitted from the red phosphor 74 can compensate for the shortage of the red component, and the warm white light Can be obtained.
JP 2004-152993 A

上記の如く、青色系可視光を発光するＬＥＤチップと黄緑色系蛍光体を備えた白色発光のＬＥＤにおいて、白色光の表現範囲を広げるためには、赤色等の所定色の可視光を放射する蛍光体を用いれば良いが、この場合、赤色等の所定色の可視光を放射する蛍光体を相当量用いる必要があり、その分、黄緑色系蛍光体の量が減少するため高輝度な白色光を得ることができなかった。
例えば、上記した従来のＬＥＤ60において、赤色系蛍光体74として（Ｚｎ，Ｃｄ）Ｓ：Ａｇ、（Ｚｎ，Ｃｄ）Ｓ：Ａｇ，Ｃｌ、ＺｎＳ：Ｍｎ、ＣａＳ：Ｅｕ等の硫化物系蛍光体を用いた場合、赤色成分の不足を補って暖色系白色光を得るためには、赤色系蛍光体74をＹＡＧ蛍光体73に対する重量比で２０〜３０重量％程度も用いる必要があるが、その分コーティング材72中に混入されるＹＡＧ蛍光体73の量が減少するため高輝度な暖色系白色光を実現することができなかった。 As described above, in a white light emitting LED including a blue visible light emitting LED chip and a yellow-green phosphor, in order to widen the expression range of white light, visible light of a predetermined color such as red is emitted. However, in this case, it is necessary to use a considerable amount of a phosphor that emits visible light of a predetermined color such as red, and the amount of yellow-green phosphor is reduced by that amount. Could not get light.
For example, in the above-described conventional LED 60, sulfide phosphors such as (Zn, Cd) S: Ag, (Zn, Cd) S: Ag, Cl, ZnS: Mn, CaS: Eu are used as the red phosphor 74. When used, in order to compensate for the shortage of the red component and obtain warm white light, it is necessary to use the red phosphor 74 in a weight ratio of about 20 to 30% by weight with respect to the YAG phosphor 73. Since the amount of the YAG phosphor 73 mixed in the coating material 72 is reduced, it is impossible to realize warm white light with high luminance.

また、青色系可視光を発光するＬＥＤチップと黄緑色系蛍光体を備えた白色発光のＬＥＤにおいて、白色光の範囲以外の所望の色の可視光を得ようとする場合には、上記した白色光の表現範囲を広げる場合以上に、赤色等の所定色の可視光を放射する蛍光体を多量に用いる必要があるが、黄緑色系蛍光体の量が著しく減少して輝度低下をもたらすため、実用に耐えないものであった。   In addition, in a white light emitting LED including an LED chip that emits blue visible light and a yellow-green fluorescent material, when the desired color of visible light outside the range of white light is to be obtained, the above white It is necessary to use a large amount of a phosphor that emits visible light of a predetermined color such as red, etc., in order to expand the expression range of light, but since the amount of yellow-green phosphor significantly decreases and causes a decrease in luminance, It was unbearable for practical use.

本発明は、上記従来の問題点に鑑みてなされたものであり、その目的とするところは、青色系可視光を発光するＬＥＤチップと、該ＬＥＤチップの発光を黄緑色系可視光に変換する蛍光体を備えたＬＥＤにおいて、白色光のみならず、所望の色の高輝度な可視光を容易に得ることのできるカラー発光ダイオードを実現することにある。   The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to convert an LED chip that emits blue-based visible light and light emission of the LED chip into yellow-green-based visible light. An object of the present invention is to realize a color light emitting diode capable of easily obtaining not only white light but also high-luminance visible light of a desired color in an LED including a phosphor.

上記の目的を達成するため、本発明に係るカラー発光ダイオードは、青色系可視光を発光するＬＥＤチップと、所定色の着色剤と、ＬＥＤチップの発光を黄緑色系可視光及び上記着色剤の色と同系色の可視光に変換して放射する多色発光蛍光体とを備え、上記ＬＥＤチップの青色系可視光、着色剤の色成分、多色発光蛍光体の黄緑色系可視光及び着色剤の色と同系色の可視光とを混色させて、所望の色の可視光を放射するよう構成されていることを特徴とする。   In order to achieve the above object, a color light emitting diode according to the present invention includes an LED chip that emits blue visible light, a colorant having a predetermined color, and yellow LED light that emits light from the LED chip and the colorant. A multicolor light emitting phosphor that converts and emits visible light of the same color as the color, and the blue-colored visible light of the LED chip, the color component of the colorant, the yellow-green-colored visible light and the color of the multicolor light-emitting phosphor It is characterized by being configured to emit visible light of a desired color by mixing the color of the agent with visible light of the same color.

上記着色剤の量は、多色発光蛍光体に対する重量比で０．００１〜２重量％と成すのが好ましい。   The amount of the colorant is preferably 0.001 to 2% by weight with respect to the polychromatic phosphor.

上記着色剤としては、例えば顔料が該当する。顔料を着色剤として用いる場合、ＬＥＤチップを透光性材料より成るコーティング材で封止すると共に、多色発光蛍光体の表面に上記顔料を付着して成る顔料付蛍光体を上記コーティング材中に混入するようにしても良い。   An example of the colorant is a pigment. When a pigment is used as a colorant, the LED chip is sealed with a coating material made of a translucent material, and a pigmented phosphor formed by adhering the pigment to the surface of a multicolor phosphor is incorporated in the coating material. You may make it mix.

本発明のカラー発光ダイオードは、青色系可視光を発光するＬＥＤチップと、所定色の着色剤と、ＬＥＤチップの発光を黄緑色系可視光及び上記着色剤の色と同系色の可視光に変換して放射する多色発光蛍光体を備えているので、ＬＥＤチップの青色系可視光と多色発光蛍光体の黄緑色系可視光とが混色して得られる白色光中に、着色剤の色成分と、多色発光蛍光体から放射される着色剤の色と同系色の可視光を混色させることにより、所望の色の可視光を得ることができる。
しかも、着色剤の色成分と、多色発光蛍光体から放射される着色剤の色と同系色の可視光とが重畳されるため、高輝度な可視光を得ることができる。 The color light-emitting diode of the present invention converts an LED chip that emits blue visible light, a colorant of a predetermined color, and light emission of the LED chip into yellow-green visible light and visible light of the same color as the colorant. The color of the colorant in the white light obtained by mixing the blue visible light of the LED chip and the yellow-green visible light of the multicolor light emitting phosphor. By mixing the component and visible light having the same color as the colorant emitted from the multicolor phosphor, visible light having a desired color can be obtained.
In addition, since the color component of the colorant and visible light having the same color as the colorant emitted from the multicolor phosphor are superimposed, high-luminance visible light can be obtained.

上記着色剤の量を、多色発光蛍光体に対する重量比で０．００１〜２重量％と成すことにより、当該着色剤の色成分を十分に白色光中に加えることができると共に、多色発光蛍光体の量も十分に確保することができ、輝度低下を生じることのない高輝度で色純度の高い可視光を得ることができる。   By making the amount of the colorant 0.001 to 2% by weight with respect to the multicolor phosphor, the color component of the colorant can be sufficiently added to white light, and multicolor light emission. A sufficient amount of the phosphor can be secured, and visible light with high brightness and high color purity can be obtained without causing a reduction in brightness.

ＬＥＤチップを透光性材料より成るコーティング材で封止すると共に、多色発光蛍光体の表面に顔料を付着して成る顔料付蛍光体を上記コーティング材中に混入すれば、多色発光蛍光体と顔料とが偏在することなく略均一に分散させることができ、色ムラの発生を抑制できる。   If the LED chip is sealed with a coating material made of a translucent material and a pigmented phosphor formed by attaching a pigment to the surface of the multicolor light emitting phosphor is mixed in the coating material, the multicolor light emitting phosphor And pigment can be dispersed substantially uniformly without uneven distribution, and the occurrence of color unevenness can be suppressed.

以下、図面に基づき、本発明に係るカラーＬＥＤの実施形態を説明する。
図１は、本発明に係るカラーＬＥＤ10を模式的に示す概略断面図であり、このカラーＬＥＤ10は、ＬＥＤチップ搭載用の第１のリードフレーム12の先端部12ａに、その底面から上方に向かって孔径が徐々に拡大する略漏斗形状の凹部を設けると共に該凹部内面を反射面と成してリフレクタ14を形成し、該リフレクタ14の底面上に、青色系の可視光を発光するＬＥＤチップ16をＡｇペースト等を介してダイボンドにより接続固定し、以て、上記第１のリードフレーム12と、ＬＥＤチップ16底面の一方の電極（図示せず）とを電気的に接続している。また、第２のリードフレーム18の先端部18ａと、上記ＬＥＤチップ16上面の他方の電極（図示せず）とをボンディングワイヤ20を介して電気的に接続して成る。
上記ＬＥＤチップ16は、約４３０ｎｍ〜５００ｎｍの波長の青色又は青紫等の青色系の可視光（以下、青色系可視光と称する）を発光し、例えば、窒化ガリウム系半導体結晶で構成されている。 Hereinafter, embodiments of a color LED according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view schematically showing a color LED 10 according to the present invention. This color LED 10 is formed on the front end portion 12a of the first lead frame 12 for mounting an LED chip from the bottom surface thereof upward. A substantially funnel-shaped concave portion having a gradually increasing hole diameter is provided, and the inner surface of the concave portion is formed as a reflective surface to form a reflector 14. On the bottom surface of the reflector 14, an LED chip 16 that emits blue visible light is provided. The first lead frame 12 and one electrode (not shown) on the bottom surface of the LED chip 16 are electrically connected to each other by die bonding via Ag paste or the like. Further, the tip end portion 18 a of the second lead frame 18 and the other electrode (not shown) on the upper surface of the LED chip 16 are electrically connected through a bonding wire 20.
The LED chip 16 emits blue or blue-violet visible light having a wavelength of about 430 nm to 500 nm (hereinafter referred to as blue visible light), and is made of, for example, a gallium nitride semiconductor crystal.

上記ＬＥＤチップ16の上面及び側面は、リフレクタ14内に充填されたエポキシ樹脂等の透光性材料より成るコーティング材22によって被覆・封止されている。
また、上記コーティング材22中には、顔料付蛍光体24が分散状態で多数混入されている。該顔料付蛍光体24は、図２に示すように、ＬＥＤチップ16の発光を黄緑色系可視光及び赤色系可視光の２色の可視光に変換して放射する粒子状の多色発光蛍光体24ａの表面に、着色剤としての赤色系顔料24ｂが付着されて成る。 The upper surface and side surfaces of the LED chip 16 are covered and sealed with a coating material 22 made of a translucent material such as an epoxy resin filled in the reflector 14.
In addition, a large number of pigmented phosphors 24 are mixed in the coating material 22 in a dispersed state. As shown in FIG. 2, the pigmented phosphor 24 converts the emitted light of the LED chip 16 into visible light of two colors, yellow green visible light and red visible light, and emits it. A red pigment 24b as a colorant is attached to the surface of the body 24a.

上記多色発光蛍光体24ａは、例えば、ＬＥＤチップ16の発光を約５６０〜５９０ｎｍ程度の黄緑色系可視光と、約６００〜７００ｎｍ程度の赤色系可視光に変換するＣａＳ：ＥｕやＣａＡｌＳｉＮ３：Ｅｕが該当する。 The multicolor phosphor 24a is, for example, CaS: Eu or CaAlSiN 3 that converts light emitted from the LED chip 16 into yellowish green visible light of about 560 to 590 nm and red visible light of about 600 to 700 nm: Eu corresponds.

上記赤色系顔料24ｂとしては、無機顔料である弁柄赤（Ｆｅ２Ｏ３）、カドミウムレッド（ＣｄＳ＋ＣｄＳｅ）、アンチモン赤（２Ｓｂ２Ｓ３・Ｓｂ２Ｏ３）、鉛丹（Ｐｂ３Ｏ４）等、有機顔料であるキナクリドン系顔料、ジオキサン系顔料等を用いることができる。
本発明に使用可能な着色剤は着色力が大きく出来るだけ光透過性のものが良く、また耐久力に優れたものが好ましい。
また、顔料の粒径は、０.０１〜０.５ミクロン、好ましくは、０.０１〜０.１ミクロン程度の超微粒子のものが好適である。これは、蛍光体に対する量が少なくても良好な効果が得られ、輝度低下を防ぐことができるからである。 As the red pigment 24b, petal red (Fe 2 O 3 ), cadmium red (CdS + CdSe), antimony red (2Sb 2 S 3 · Sb 2 O 3 ), red lead (Pb 3 O 4 ), which are inorganic pigments, are used. For example, quinacridone pigments and dioxane pigments which are organic pigments can be used.
The colorant that can be used in the present invention is preferably light-transmitting as much as possible to increase the coloring power, and is preferably excellent in durability.
The pigment has a particle size of 0.01 to 0.5 microns, preferably about 0.01 to 0.1 microns. This is because even if the amount with respect to the phosphor is small, a good effect can be obtained and luminance reduction can be prevented.

上記顔料付蛍光体24は、例えば以下の方法で作製することができる。水中に粉末状の多色発光蛍光体24ａを分散させた蛍光体分散液と、水中に赤色系顔料24ｂを分散した顔料分散液とを混合・撹拌した後、ゼラチンを添加して撹拌を続ける。その後、酢酸等を添加してｐＨ４に調整すると、多色発光蛍光体24ａの表面に赤色系顔料24ｂが付着し、その後、濾過、脱水することにより、上記顔料付蛍光体24が得られる。   The pigmented phosphor 24 can be produced, for example, by the following method. After mixing and stirring the phosphor dispersion in which the powdered multicolor phosphor 24a is dispersed in water and the pigment dispersion in which the red pigment 24b is dispersed in water, gelatin is added and stirring is continued. Thereafter, when the pH is adjusted to 4 by adding acetic acid or the like, the red pigment 24b adheres to the surface of the multicolor phosphor 24a, and then filtered and dehydrated to obtain the phosphor 24 with pigment.

上記コーティング材22で被覆されたＬＥＤチップ16、第１のリードフレーム12の先端部12ａ及び端子部12ｂの上端、第２のリードフレーム18の先端部18ａ及び端子部18ｂの上端は、先端に凸レンズ部28を有するエポキシ樹脂、シリコーン樹脂等より成る透光性の外囲器30によって被覆・封止されている。   The LED chip 16 covered with the coating material 22, the top ends of the leading end portion 12a and the terminal portion 12b of the first lead frame 12, and the top end portions 18a and 18b of the second lead frame 18 are convex lenses at the leading end. It is covered and sealed with a translucent envelope 30 made of an epoxy resin, a silicone resin or the like having a portion 28.

而して、第１のリードフレーム12及び第２のリードフレーム18を介してＬＥＤチップ16に電圧が印加されると、ＬＥＤチップ16が発光して青色系可視光が放射される。また、ＬＥＤチップ16の発光を受けて、多色発光蛍光体24ａから黄緑色系可視光及び赤色系可視光が放射される。さらに、ＬＥＤチップ16から放射された青色系可視光と、多色発光蛍光体24ａから放射された黄緑色系可視光が、赤色系顔料24ｂで反射したり、赤色系顔料24ｂを透過することにより赤色成分が生成される。
そして、ＬＥＤチップ16の青色系可視光と多色発光蛍光体24ａの黄緑色系可視光とが混色して得られる白色光中に、赤色系顔料24ｂの赤色成分と多色発光蛍光体24ａの赤色系可視光が混色することにより赤色系可視光が得られ、該赤色系可視光が外囲器30の凸レンズ部28によって集光されて外部へ放射されるようになっている。 Thus, when a voltage is applied to the LED chip 16 via the first lead frame 12 and the second lead frame 18, the LED chip 16 emits light and blue visible light is emitted. Further, in response to the light emitted from the LED chip 16, yellowish green visible light and red visible light are emitted from the multicolor phosphor 24a. Further, blue-based visible light emitted from the LED chip 16 and yellow-green visible light emitted from the multicolor phosphor 24a are reflected by the red pigment 24b or transmitted through the red pigment 24b. A red component is produced.
Then, in the white light obtained by mixing the blue visible light of the LED chip 16 and the yellowish green visible light of the multicolor light emitting phosphor 24a, the red component of the red pigment 24b and the multicolor light emitting phosphor 24a are mixed. The red visible light is obtained by mixing the red visible light, and the red visible light is collected by the convex lens portion 28 of the envelope 30 and emitted to the outside.

本発明のカラーＬＥＤ10にあっては、多色発光蛍光体24ａから放射される赤色系可視光と、赤色系顔料24ｂによって、ＬＥＤチップ16の青色系可視光と多色発光蛍光体24ａの黄緑色系可視光とが混色して得られる白色光中に赤色成分を加えることができ、赤色系可視光を容易に得ることができる。
上記赤色系顔料24ｂの量は、多色発光蛍光体24ａに対する重量比で０．００１〜２重量％、好ましくは０．０１〜０．５重量％と成される。
而して、０．００１重量％の赤色系顔料24ｂの量で赤色系可視光を実現できると共に、カラーＬＥＤ10の輝度低下を生じないよう赤色系顔料24ｂの量は２重量％以下とするのが適当である。このように、赤色系顔料24ｂの量を、多色発光蛍光体24ａに対する重量比で０．００１〜２重量％と成すことにより、多色発光蛍光体24ａの量を十分に確保することができ、高輝度なカラーＬＥＤ10を実現できる。
また、０．０１〜０．５重量％とした場合には、赤色系顔料24ｂの色成分を十分に加えることができると共に、多色発光蛍光体24ａの量を一層確保することができ、輝度の低下を殆ど生じることのないカラーＬＥＤ10を得ることができる。 In the color LED 10 of the present invention, the red visible light emitted from the multicolor phosphor 24a and the red pigment 24b cause the blue visible light of the LED chip 16 and the yellow-green color of the multicolor phosphor 24a. The red component can be added to the white light obtained by mixing the system visible light and the red visible light can be easily obtained.
The amount of the red pigment 24b is 0.001 to 2% by weight, preferably 0.01 to 0.5% by weight, based on the weight ratio with respect to the multicolor phosphor 24a.
Thus, red visible light can be realized with an amount of 0.001% by weight of red pigment 24b, and the amount of red pigment 24b should be 2% by weight or less so that the luminance of the color LED 10 does not decrease. Is appropriate. As described above, by making the amount of the red pigment 24b 0.001 to 2% by weight with respect to the multicolor phosphor 24a, the amount of the multicolor phosphor 24a can be sufficiently secured. A high-luminance color LED 10 can be realized.
Further, when the content is 0.01 to 0.5% by weight, the color component of the red pigment 24b can be sufficiently added, and the amount of the multicolor light emitting phosphor 24a can be further secured, and the luminance can be increased. Thus, it is possible to obtain the color LED 10 that hardly causes a decrease in the color.

図３は、赤色系可視光を放射するよう構成した本発明のカラーＬＥＤ10の色度図である。
本発明のカラーＬＥＤ10は、多色発光蛍光体24ａとしてＣａＡｌＳｉＮ３：Ｅｕ、赤色系顔料24ｂとして弁柄赤（Ｆｅ２Ｏ３）を用い、図３において、（１）は多色発光蛍光体24ａに対する赤色系顔料24ｂの割合が０重量％の場合の色度、（２）は多色発光蛍光体24ａに対する赤色系顔料24ｂの割合が０．００５重量％の場合の色度、（３）は多色発光蛍光体24ａに対する赤色系顔料24ｂの割合が０．０１重量％の場合の色度、（４）は多色発光蛍光体24ａに対する赤色系顔料24ｂの割合が０．１重量％の場合の色度、（５）は多色発光蛍光体24ａに対する赤色系顔料24ｂの割合が１重量％の場合の色度、（６）は比較例として、黄緑色系可視光のみを放射する希土類元素を付活させたＣａ（Ｓｉ，Ａｌ）12（Ｎ，Ｏ）16より成るサイアロン蛍光体のみ使用した場合の色度を示している。
図３に示される通り、本発明のカラーＬＥＤ10の場合には、０．００５〜１重量％の範囲の少量の赤色系顔料24ｂを用いるだけで、赤色系可視光が得られている。 FIG. 3 is a chromaticity diagram of the color LED 10 of the present invention configured to emit red visible light.
In the color LED 10 of the present invention, CaAlSiN 3 : Eu is used as the multicolor phosphor 24a, and petal red (Fe 2 O 3 ) is used as the red pigment 24b. In FIG. 3, (1) is the multicolor phosphor 24a. (2) is the chromaticity when the ratio of the red pigment 24b to the multicolor phosphor 24a is 0.005% by weight, (3) Chromaticity when the ratio of the red pigment 24b to the multicolor phosphor 24a is 0.01% by weight. (4) is the case where the ratio of the red pigment 24b to the multicolor phosphor 24a is 0.1% by weight. (5) is the chromaticity when the ratio of the red pigment 24b to the multicolor phosphor 24a is 1% by weight, and (6) is a rare earth element that emits only yellow-green visible light as a comparative example. It was allowed to activated Ca (Si, Al) 12 ( N, O) sialon phosphor made of 16 It shows a chromaticity when used alone.
As shown in FIG. 3, in the case of the color LED 10 of the present invention, red visible light can be obtained only by using a small amount of the red pigment 24b in the range of 0.005 to 1% by weight.

上記においては、コーティング材22中に顔料付蛍光体24（図２）を混入した場合を例に挙げて説明したが、本発明はこれに限定されるものではなく、粒子状の多色発光蛍光体24ａと粒子状の赤色系顔料24ｂとを混合状態でコーティング材22中に分散させても良い。
但し、多色発光蛍光体24ａと赤色系顔料24ｂとは粒径や比重が異なるため、これらをコーティング材22中にそのまま混入すると、コーティング材22中に均一に分布せず、多色発光蛍光体24ａと赤色系顔料24ｂとが偏在してしまうことがある。この場合、多色発光蛍光体24ａの発光色と赤色系顔料24ｂの赤色成分とが十分に混色せず、色ムラを生じる原因となる。これに対し、多色発光蛍光体24ａの表面に赤色系顔料24ｂを付着して構成した上記顔料付蛍光体24をコーティング材22中に混入した場合には、多色発光蛍光体24ａと赤色系顔料24ｂとが偏在することなく略均一に分散させることができるので、顔料付蛍光体24を用いるのが好ましい。 In the above description, the case where the pigmented phosphor 24 (FIG. 2) is mixed in the coating material 22 has been described as an example. However, the present invention is not limited to this, and the particulate multicolor emission fluorescence is not limited thereto. The body 24a and the particulate red pigment 24b may be dispersed in the coating material 22 in a mixed state.
However, since the multicolor light emitting phosphor 24a and the red pigment 24b have different particle sizes and specific gravity, if they are mixed in the coating material 22 as they are, they are not distributed uniformly in the coating material 22, and the multicolor light emitting phosphor 24a and red pigment 24b may be unevenly distributed. In this case, the emission color of the multicolor phosphor 24a and the red component of the red pigment 24b are not sufficiently mixed, causing color unevenness. On the other hand, when the above-described pigmented phosphor 24 formed by attaching the red pigment 24b to the surface of the multicolor phosphor 24a is mixed in the coating material 22, the multicolor phosphor 24a and the red phosphor 24a are mixed. Since the pigment 24b can be dispersed substantially uniformly without being unevenly distributed, the pigmented phosphor 24 is preferably used.

また、コーティング材22中に、透明無機材料であるシリカ25で被覆された顔料付き蛍光体24（図４）を混入するようにしても良い。
このシリカ25で被覆された顔料付き蛍光体24は、以下の方法で作製できる。先ず、水硝子水中に多色発光蛍光体24ａ粉末を均一に分散させた液中に、予め乳化剤と共に非水溶剤中等に所定量の赤色系顔料24ｂを均一分散させた着色液を入れ、高速攪拌しで微細な乳化分散液を作成する。その後、水硝子の硬化剤又はＰＨ調整等を行うことにより、多色発光蛍光体24ａ表面に赤色系顔料24ｂが均一に付着すると共に、多色発光蛍光体24ａ及び赤色系顔料24ｂが水硝子のシリカ成分によって被覆（カプセル化）された顔料付蛍光体24が得られる。
上記顔料付き蛍光体24は、シリカ25で被覆されているのでカラーＬＥＤ10内部に浸入してきた水分が多色発光蛍光体24ａや赤色系顔料24ｂに付着することを防止でき、耐湿性に優れている。 Further, the pigmented phosphor 24 (FIG. 4) covered with silica 25, which is a transparent inorganic material, may be mixed in the coating material 22.
The pigmented phosphor 24 coated with silica 25 can be produced by the following method. First, a colored liquid in which a predetermined amount of a red pigment 24b is uniformly dispersed in a non-aqueous solvent or the like together with an emulsifier is placed in a liquid in which the powder of the multicolor light emitting phosphor 24a is uniformly dispersed in water glass water. Then, a fine emulsified dispersion is prepared. Thereafter, the red pigment 24b uniformly adheres to the surface of the multicolor light emitting phosphor 24a by adjusting the curing agent or pH of the water glass, and the multicolor light emitting phosphor 24a and the red pigment 24b are made of water glass. A pigmented phosphor 24 coated (encapsulated) with a silica component is obtained.
Since the pigmented phosphor 24 is coated with silica 25, moisture that has entered the color LED 10 can be prevented from adhering to the multicolor phosphor 24a and the red pigment 24b, and is excellent in moisture resistance. .

上記においては、青色系可視光を発光するＬＥＤチップ16と、着色剤としての赤色系顔料24ｂと、ＬＥＤチップ16の発光を黄緑色系可視光及び赤色系可視光の２色の可視光に変換して放射する多色発光蛍光体24ａを用いて、赤色系可視光を得る場合を例に挙げて説明したが、本発明はこれに限定されるものではない。
すなわち、青色系可視光を発光するＬＥＤチップ16と、所定色の顔料（着色剤）と、ＬＥＤチップ16の発光を黄緑色系可視光及び上記顔料（着色剤）の色と同系色の可視光に変換して放射する多色発光蛍光体を用いることにより、顔料（着色剤）の色成分と、多色発光蛍光体から放射される顔料（着色剤）の色と同系色の可視光とが加わり、カラーＬＥＤ10から放射される光の色の表現範囲を広げることができる。しかも、顔料（着色剤）の色成分と、多色発光蛍光体から放射される顔料（着色剤）の色と同系色の可視光とが重畳されるため、高輝度な可視光を得ることができる。
例えば、着色剤としての酸化クロム（Ｃｒ２Ｏ３）、ピリジアン（Ｃｒ２Ｏ(ＯＨ)４）、コバルトグリーン（ＣｏＯ・ＺｎＯ・ＭｇＯ）、ダイピロキサイドＴＭグリーン等の緑色系の無機顔料やフタロシアニングリーン等の緑色系の有機顔料と、ＬＥＤチップ16の発光を黄緑色系可視光及び緑色系可視光の２色の可視光に変換して放射するＳｒＧａ２Ｓ：ＥｕやＣａ３Ｓｃ２Ｓｉ３Ｏ１２：Ｃｅ等の多色発光蛍光体を用いれば、着色剤の緑色系成分と多色発光蛍光体の緑色系可視光とが重畳して、高輝度な緑色系可視光を得ることができる。
尚、所定色の顔料（着色剤）の量は、上記赤色系顔料24ｂの場合と同様に、多色発光蛍光体に対する重量比で０．００１〜２重量％と成される。
すなわち、０．００１重量％の顔料（着色剤）の量で、当該顔料（着色剤）の色成分を十分に加えることができると共に、カラーＬＥＤ10の輝度低下を生じないよう顔料（着色剤）の量は２重量％以下とするのが適当である。 In the above, the LED chip 16 that emits blue visible light, the red pigment 24b as a colorant, and the light emission of the LED chip 16 is converted into visible light of two colors, yellow-green visible light and red visible light. Although the case where red-colored visible light is obtained using the multicolor light emitting phosphor 24a emitted as an example has been described, the present invention is not limited to this.
That is, the LED chip 16 that emits blue visible light, a pigment (colorant) of a predetermined color, and the LED chip 16 emits yellowish green visible light and visible light of the same color as the color of the pigment (colorant). By using a multicolor phosphor that emits light after being converted into a color, the color component of the pigment (colorant) and the visible light of the same color as the color of the pigment (colorant) emitted from the multicolor phosphor In addition, the expression range of the color of light emitted from the color LED 10 can be expanded. In addition, since the color component of the pigment (colorant) and the visible light of the same color as the color of the pigment (colorant) emitted from the multicolor phosphor are superimposed, high-luminance visible light can be obtained. it can.
For example, green inorganic pigments such as chromium oxide (Cr 2 O 3 ), pyridiane (Cr 2 O (OH) 4 ), cobalt green (CoO · ZnO · MgO), and dipyroxide TM green as colorants and phthalocyanines SrGa 2 S: Eu or Ca 3 Sc 2 Si 3 that emits green organic pigments such as green and LED chip 16 that emits light by converting the emitted light of yellow-green visible light and green visible light into two colors. When a multicolor phosphor such as O 12 : Ce is used, the green component of the colorant and the green visible light of the multicolor phosphor can be superimposed to obtain high-brightness green visible light. .
Note that the amount of the pigment (colorant) of a predetermined color is 0.001 to 2% by weight in a weight ratio with respect to the multicolor phosphor as in the case of the red pigment 24b.
That is, the amount of the pigment (coloring agent) of 0.001% by weight can sufficiently add the color component of the pigment (coloring agent), and the pigment (coloring agent) of the color LED 10 does not decrease in luminance. The amount is suitably 2% by weight or less.

図５は、緑色系可視光を放射するよう構成した本発明のカラーＬＥＤ10の色度図である。
本発明のカラーＬＥＤ10は、多色発光蛍光体24ａとしてＣａ３Ｓｃ２Ｓｉ３Ｏ１２：Ｃｅ、緑色系顔料としてコバルトグリーンを用い、図５において、（１）は多色発光蛍光体24ａに対する緑色系顔料の割合が０重量％の場合の色度、（２）は多色発光蛍光体24ａに対する緑色系顔料の割合が０．００１重量％の場合の色度、（３）は多色発光蛍光体24ａに対する緑色系顔料の割合が０．０１重量％の場合の色度、（４）は多色発光蛍光体24ａに対する緑色系顔料の割合が０．１重量％の場合の色度、（５）は多色発光蛍光体24ａに対する緑色系顔料の割合が０．５重量％の場合の色度、（６）は比較例として、黄緑色系可視光のみを放射する希土類元素を付活させたＣａ（Ｓｉ，Ａｌ）12（Ｎ，Ｏ）16より成るサイアロン蛍光体のみ使用した場合の色度を示している。
図５に示される通り、本発明のカラーＬＥＤ10の場合には、０．００１〜０．５重量％の範囲の少量の緑色系顔料を用いるだけで、緑色系可視光が得られている。 FIG. 5 is a chromaticity diagram of the color LED 10 of the present invention configured to emit green visible light.
The color LED 10 of the present invention uses Ca 3 Sc 2 Si 3 O 12 : Ce as the multicolor light emitting phosphor 24a and cobalt green as the green pigment, and in FIG. 5, (1) is the green color for the multicolor light emitting phosphor 24a. The chromaticity when the proportion of the pigment is 0% by weight, (2) is the chromaticity when the proportion of the green pigment to the multicolor phosphor 24a is 0.001% by weight, and (3) is the multicolor emission fluorescence. The chromaticity when the ratio of the green pigment to the body 24a is 0.01% by weight, (4) is the chromaticity when the ratio of the green pigment to the multicolor phosphor 24a is 0.1% by weight, (5 ) Is the chromaticity when the ratio of the green pigment to the multicolor phosphor 24a is 0.5% by weight, and (6) is a comparative example in which a rare earth element that emits only yellow-green visible light is activated. Ca (Si, Al) 12 ( N, O) 16 only sialon phosphor made of Shows a chromaticity when the.
As shown in FIG. 5, in the case of the color LED 10 of the present invention, green-based visible light can be obtained only by using a small amount of green-based pigment in the range of 0.001 to 0.5% by weight.

着色剤としては、上記した各色顔料24ｂ等の他に、耐候性を有する染料、蛍光染料等を用いることもできる。
また、有機ＥＬに用いられる色変換材料である非共役系高分子（ポリイミド系、ポリビニールカルバゾール誘導体）、共役系高分子等を用いることもできる。さらに、雲母扁平表面にチタンを被覆した各色顔料も有用である。これら着色剤は、色成分を加えることができると共に、カラーＬＥＤ10の更なる輝度向上も図ることができる。 As the colorant, in addition to the above-described color pigments 24b and the like, a weather-resistant dye, a fluorescent dye, and the like can also be used.
In addition, non-conjugated polymers (polyimide, polyvinyl carbazole derivatives), conjugated polymers, and the like, which are color conversion materials used for organic EL, can also be used. Further, each color pigment in which titanium is coated on the flat surface of mica is also useful. These colorants can add color components and can further improve the luminance of the color LED 10.

本発明に係るカラーＬＥＤを模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically color LED which concerns on this invention. 顔料付蛍光体を模式的に示す断面図である。It is sectional drawing which shows a fluorescent substance with a pigment typically. 赤色系可視光を放射するよう構成した本発明のカラーＬＥＤの色度図である。It is a chromaticity diagram of the color LED of the present invention configured to emit red visible light. シリカで被覆された顔料付き蛍光体を模式的に示す断面図である。It is sectional drawing which shows typically the fluorescent substance with a pigment coat | covered with the silica. 緑色系可視光を放射するよう構成した本発明のカラーＬＥＤの色度図である。It is a chromaticity diagram of the color LED of the present invention configured to emit green-based visible light. 従来のＬＥＤの概略断面図である。It is a schematic sectional drawing of conventional LED.

符号の説明Explanation of symbols

10 カラーＬＥＤ
12 第１のリードフレーム
14 リフレクタ
16 ＬＥＤチップ
18 第２のリードフレーム
22 コーティング材
24 顔料付蛍光体
24ａ 多色発光蛍光体
24ｂ 赤色系顔料
28 外囲器

10 Color LED
12 First lead frame
14 Reflector
16 LED chip
18 Second lead frame
22 Coating material
24 Phosphor with pigment
24a Multicolor phosphor
24b Red pigment
28 Envelope

Claims (4)

青色系可視光を発光するＬＥＤチップと、所定色の着色剤と、ＬＥＤチップの発光を黄緑色系可視光及び上記着色剤の色と同系色の可視光に変換して放射する多色発光蛍光体とを備え、上記ＬＥＤチップの青色系可視光、着色剤の色成分、多色発光蛍光体の黄緑色系可視光及び着色剤の色と同系色の可視光とを混色させて、所望の色の可視光を放射するよう構成されていることを特徴とするカラー発光ダイオード。   LED chip that emits blue-based visible light, a colorant of a predetermined color, and multicolor luminescent fluorescence that emits by converting the light emitted from the LED chip into yellow-green-based visible light and visible light of the same color as the colorant A blue-colored visible light of the LED chip, a color component of the colorant, a yellow-green-colored visible light of the multicolor phosphor, and a visible light of the same color as that of the colorant. A color light emitting diode configured to emit visible light of a color. 上記着色剤の量は、多色発光蛍光体に対する重量比で０．００１〜２重量％であることを特徴とする請求項１に記載のカラー発光ダイオード   The color light emitting diode according to claim 1, wherein the amount of the colorant is 0.001 to 2% by weight based on the weight of the multicolor phosphor. 上記着色剤が顔料であることを特徴とする請求項１又は２に記載のカラー発光ダイオード。   The color light-emitting diode according to claim 1, wherein the colorant is a pigment. 上記ＬＥＤチップを透光性材料より成るコーティング材で封止すると共に、多色発光蛍光体の表面に上記顔料を付着して成る顔料付蛍光体を上記コーティング材中に混入したことを特徴とする請求項３に記載のカラー発光ダイオード。

The LED chip is sealed with a coating material made of a translucent material, and a pigmented phosphor formed by adhering the pigment to the surface of a multicolor phosphor is mixed in the coating material. The color light emitting diode according to claim 3.

JP2006098338A 2006-03-31 2006-03-31 Color light-emitting diode Pending JP2007273776A (en)

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