JP2007243055A - Light-emitting device - Google Patents

Light-emitting device Download PDF

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JP2007243055A
JP2007243055A JP2006066410A JP2006066410A JP2007243055A JP 2007243055 A JP2007243055 A JP 2007243055A JP 2006066410 A JP2006066410 A JP 2006066410A JP 2006066410 A JP2006066410 A JP 2006066410A JP 2007243055 A JP2007243055 A JP 2007243055A
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color conversion
light
conversion member
visible light
led chip
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JP4353196B2 (en
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Takao Hayashi
隆夫 林
Kenichiro Tanaka
健一郎 田中
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works 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
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device for improving color rendering properties as compared with a conventional one. <P>SOLUTION: White light can be obtained by mixing first visible light (blue light) radiated from an LED chip 1, second visible light (red light) color-converted from the first visible light by a first cover conversion member 20, and third visible light (green light) color-converted from the first visible light by a second color conversion member 30, thus increasing the second visible light (red light) at a long-wavelength region and hence improving color rendering properties. Further, since an air layer 60 is formed between the first and second color conversion members 20, 30, the quantity of light that is scattered to the side of the first color conversion member 20 and passes through the first color conversion member 20 in the blue light scattered by the second color conversion member 30 can be reduced. Further, since a cover 50 is present outside the second color conversion member 30, the quantity of light returning to the side of the second color conversion member 30 in the blue light scattered to the outside (the side of the cover 50) can be reduced, thus improving color conversion efficiency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ＬＥＤチップ（発光ダイオードチップ）を利用した発光装置に関するものである。   The present invention relates to a light emitting device using an LED chip (light emitting diode chip).

従来、相対的に波長の短い第１の可視光を放射するＬＥＤチップと、ＬＥＤチップが実装されたベース部材と、ベース部材におけるＬＥＤチップの実装面側に配設され第１の可視光によって励起されて第１の可視光の波長よりも波長の長い第２の可視光を放射する蛍光材料を透明材料とともに成形した成形品からなる色変換部材とを備えた発光装置が提案されている（例えば、特許文献１参照）。なお、この種の発光装置としては、例えば、第１の可視光として青色光を放射するＬＥＤチップと、第２の可視光として黄色光を放射する蛍光体とを混色させて白色光（白色光の発光スペクトル）を得る白色発光装置（一般に白色ＬＥＤと呼ばれている。）が商品化されている。
特開２００１-１４８５１４号公報 Conventionally, an LED chip that emits first visible light having a relatively short wavelength, a base member on which the LED chip is mounted, and an excitation surface that is disposed on the LED chip mounting surface side of the base member by the first visible light. There has been proposed a light emitting device including a color conversion member made of a molded product obtained by molding a fluorescent material that emits second visible light having a wavelength longer than that of the first visible light together with a transparent material (for example, , See Patent Document 1). As this type of light emitting device, for example, an LED chip that emits blue light as first visible light and a phosphor that emits yellow light as second visible light are mixed to produce white light (white light). White light-emitting devices (generally referred to as white LEDs) are commercially available.
JP 2001-148514 A

しかしながら、上記白色発光装置では青色光と黄色光を混色させているために長波長領域の可視光（赤色光）が不足しており、そのために演色性が低いという問題があった。   However, in the white light emitting device, since blue light and yellow light are mixed, there is a shortage of visible light (red light) in a long wavelength region, and there is a problem that color rendering is low.

本発明は上記事情に鑑みて為されたものであり、その目的は、演色性を向上した発光装置を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a light emitting device with improved color rendering.

請求項１の発明は、上記目的を達成するために、相対的に波長の短い第１の可視光を放射するＬＥＤチップと、ＬＥＤチップが実装されたベース部材と、ベース部材におけるＬＥＤチップの実装面側に配設され第１の可視光によって励起されて第１の可視光の波長よりも波長の長い第２の可視光を放射する第１の蛍光材料を透明材料とともに成形した成形品からなる第１の色変換部材と、第１の色変換部材に対してベース部材と反対側に空気層を介在するようにして配設され第１の色変換部材を通過した第１の可視光によって励起されて第１の可視光よりも波長が長く且つ第２の可視光よりも波長の短い第３の可視光を放射する第２の蛍光材料からなる第２の色変換部材と、第２の色変換部材に対してベース部材と反対側に密着するように配設され透明材料の成形品からなるカバーとを備えたことを特徴とする。   In order to achieve the above object, the invention of claim 1 is directed to an LED chip that emits first visible light having a relatively short wavelength, a base member on which the LED chip is mounted, and mounting of the LED chip on the base member. It consists of a molded product which is disposed on the surface side and is excited with the first visible light and which emits the second visible light having a wavelength longer than the wavelength of the first visible light together with the transparent material. Excited by the first visible light that is disposed through the first color conversion member and the first color conversion member that is disposed with the air layer interposed on the opposite side of the base member with respect to the first color conversion member A second color conversion member made of a second fluorescent material that emits third visible light that has a longer wavelength than the first visible light and a shorter wavelength than the second visible light, and a second color Arranged so that the conversion member is in close contact with the base member It is characterized by comprising a cover made of molded article transparent material.

請求項２の発明は、請求項１の発明において、第２の蛍光材料を透明材料とともに成形することで第２の色変換部材とカバーとを一体に形成したことを特徴とする。   The invention of claim 2 is characterized in that, in the invention of claim 1, the second color conversion member and the cover are integrally formed by molding the second fluorescent material together with the transparent material.

請求項３の発明は、請求項１又は２の発明において、第１及び第２の色変換部材並びにカバーがドーム状に形成されたことを特徴とする。   The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the first and second color conversion members and the cover are formed in a dome shape.

請求項１の発明によれば、ＬＥＤチップから放射された第１の可視光と、第１の色変換部材によって第１の可視光から色変換された第２の可視光と、第２の色変換部材によって第１の可視光から色変換された第３の可視光とを混色することで白色光を得ることができるとともに、長波長領域の可視光（第２の可視光）が増えるために従来例に比較して演色性が向上し、また、第２の色変換部材で反射した第１の可視光が第１の色変換部材によって第２の可視光に色変換されるから、色の変換効率が向上するという効果がある。さらに、第１の色変換部材と第２の色変換部材との間に空気層が介在しているため、第２の色変換部材で散乱された光のうち、第１の色変換部材側へ散乱されて第１の色変換部材を通過する光の量を低減することができ、しかも、第２の色変換部材の外側には透明材料の成形品からなるカバーが存在するため、カバーが存在しない場合、すなわち、第２の色変換部材が直接空気に触れている場合に比較して、外側（カバー側）へ散乱された光のうち、第２の色変換部材側に戻る光の量を低減することができて色の変換効率が向上するという効果がある。   According to the first aspect of the present invention, the first visible light emitted from the LED chip, the second visible light color-converted from the first visible light by the first color conversion member, and the second color The white light can be obtained by mixing the third visible light that is color-converted from the first visible light by the conversion member, and the visible light in the long wavelength region (second visible light) increases. The color rendering property is improved as compared with the conventional example, and the first visible light reflected by the second color conversion member is color-converted to the second visible light by the first color conversion member. There is an effect that the conversion efficiency is improved. Further, since an air layer is interposed between the first color conversion member and the second color conversion member, the light scattered by the second color conversion member is directed to the first color conversion member side. The amount of light scattered and passing through the first color conversion member can be reduced, and there is a cover made of a transparent material molded product on the outside of the second color conversion member. In other words, the amount of light returning to the second color conversion member side out of the light scattered to the outside (the cover side) compared to when the second color conversion member is in direct contact with air. This can reduce the color conversion efficiency and improve the color conversion efficiency.

請求項２の発明によれば、第２の色変換部材とカバーとを一体に形成することで部品点数並びに組立工程が削減できるとともに第２の色変換部材の強度が向上するという効果がある。   According to the invention of claim 2, by forming the second color conversion member and the cover integrally, there are effects that the number of parts and the assembly process can be reduced and the strength of the second color conversion member is improved.

請求項３の発明によれば、ＬＥＤチップから放射された第１の可視光が第１及び第２の色変換部材に達するまでの光路長がほぼ均一になるために色むらの発生を抑えることができるという効果がある。さらに、色変換された光がＬＥＤチップ側に戻る量を低減することができて色変換効率が向上するという効果もある。   According to the invention of claim 3, since the optical path length until the first visible light emitted from the LED chip reaches the first and second color conversion members is substantially uniform, the occurrence of color unevenness is suppressed. There is an effect that can be. Further, the amount of the color converted light returning to the LED chip can be reduced, and the color conversion efficiency is improved.

本実施形態の発光装置は、図１に示すようにＬＥＤチップ１と、ＬＥＤチップ１が実装されたベース部材たる実装基板１０と、実装基板１０におけるＬＥＤチップ１の実装面側に配設される第１の色変換部材２０と、第１の色変換部材２０に対して実装基板１０と反対側に配設される第２の色変換部材３０と、第２の色変換部材３０に対して実装基板１０と反対側に密着するように配設されるカバー５０とを備える。   As shown in FIG. 1, the light emitting device of the present embodiment is disposed on the LED chip 1, a mounting substrate 10 that is a base member on which the LED chip 1 is mounted, and a mounting surface side of the LED chip 1 on the mounting substrate 10. Mounted on the first color conversion member 20, the second color conversion member 30 disposed on the opposite side of the mounting substrate 10 with respect to the first color conversion member 20, and the second color conversion member 30 And a cover 50 disposed so as to be in close contact with the substrate 10 on the opposite side.

実装基板１０は、金属板１１上に絶縁層１２を介して対となる導体パターン１３，１３が形成された金属基板からなり、ＬＥＤチップ１で発生した熱が金属板１１に伝導されるようになっている。なお、金属板１１の材料としてＣｕを採用しているが、熱伝導率が比較的高い金属材料であればよく、Ｃｕに限らず、Ａｌなどを採用してもよい。   The mounting substrate 10 is made of a metal substrate on which a pair of conductor patterns 13 and 13 are formed via an insulating layer 12 on a metal plate 11 so that heat generated in the LED chip 1 is conducted to the metal plate 11. It has become. In addition, although Cu is employ | adopted as a material of the metal plate 11, what is necessary is just a metal material with comparatively high heat conductivity, and not only Cu but Al etc. may be employ | adopted.

ＬＥＤチップ１は、青色光（第１の可視光）を放射するＧａＮ系青色ＬＥＤチップであり、サファイア基板からなる結晶成長用基板２の主表面側にＧａＮ系化合物半導体材料により形成されて、例えばダブルへテロ構造を有する積層構造部からなる発光部３がエピタキシャル成長法（例えば、ＭＯＶＰＥ法など）により成長させてある。   The LED chip 1 is a GaN-based blue LED chip that emits blue light (first visible light), and is formed of a GaN-based compound semiconductor material on the main surface side of a crystal growth substrate 2 made of a sapphire substrate. A light emitting portion 3 composed of a laminated structure portion having a double hetero structure is grown by an epitaxial growth method (for example, MOVPE method).

また、ＬＥＤチップ１は、ＬＥＤチップ１のチップサイズよりも大きなサイズの矩形板状に形成されたサブマウント部材４０を介して金属板１１上に搭載されており、図示しないアノード電極並びにカソード電極がそれぞれボンディングワイヤ４を介して導体パターン１３，１３と電気的に接続されている。ここで、サブマウント部材４０は、熱伝導率が比較的に高く且つ絶縁性を有する材料（例えば、ＡｌＮや複合ＳｉＣなど）によって形成されている。なお、ＬＥＤチップ１とサブマウント部材４０とは、ＡｕＳｎ、ＳｎＡｇＣｕなどの鉛フリー半田を用いて接合されている。   The LED chip 1 is mounted on the metal plate 11 via a submount member 40 formed in a rectangular plate shape larger than the chip size of the LED chip 1, and an anode electrode and a cathode electrode (not shown) are provided. Each is electrically connected to the conductor patterns 13 and 13 via the bonding wires 4. Here, the submount member 40 is formed of a material having a relatively high thermal conductivity and an insulating property (for example, AlN or composite SiC). The LED chip 1 and the submount member 40 are bonded using lead-free solder such as AuSn or SnAgCu.

第１の色変換部材２０は、シリコーン樹脂のような透明材料をドーム状（半球状）に成形した成形品により構成され、ＬＥＤチップ１から放射された第１の可視光（青色光）によって励起されて第１の可視光の波長よりも波長の長い第２の可視光（赤色光）を放射する粒子状の赤色蛍光体からなる第１の蛍光材料を多量に含む蛍光体層２１がＬＥＤチップ１に対向する内周面側に一体に形成されている。そして、第１の色変換部材２０は、例えば接着剤（シリコーン樹脂やエポキシ樹脂など）を用いて開口部の周縁を実装基板１０に対して接着することでサブマウント部材４０とともにＬＥＤチップ１を覆う形で実装基板１０に搭載されている。   The first color conversion member 20 is formed of a molded product formed of a transparent material such as silicone resin in a dome shape (hemisphere), and is excited by the first visible light (blue light) emitted from the LED chip 1. The phosphor layer 21 containing a large amount of the first fluorescent material made of the particulate red phosphor that emits the second visible light (red light) having a wavelength longer than the wavelength of the first visible light is the LED chip. 1 is integrally formed on the inner peripheral surface side facing to 1. And the 1st color conversion member 20 covers LED chip 1 with the submount member 40 by adhere | attaching the periphery of an opening part with respect to the mounting board | substrate 10 using adhesives (silicone resin, an epoxy resin, etc.), for example. It is mounted on the mounting substrate 10 in the form.

カバー５０は、シリコーン樹脂のような透明材料をドーム状（半球状）に成形した成形品により構成され、ＬＥＤチップ１から放射された第１の可視光（青色光）によって励起されて第１の可視光よりも波長が長く且つ第２の可視光（赤色光）よりも波長の短い第３の可視光（緑色光）を放射する粒子状の緑色蛍光体からなる第２の蛍光材料をドーム状（半球状）に形成してなる第２の色変換部材３０が第１の色変換部材２０に対向する内周面側に一体に形成されている。そして、第２の色変換部材３０並びにカバー５０は、例えば接着剤（シリコーン樹脂やエポキシ樹脂など）を用いて開口部の周縁を実装基板１０に対して第１の色変換部材２０の外側に接着することで第１の色変換部材２０とともにサブマウント部材４０やＬＥＤチップ１を覆う形で実装基板１０に搭載されている。但し、第１の色変換部材２０並びにカバー５０に用いる透明材料は、シリコーン樹脂に限らず、例えば、アクリル樹脂、エポキシ樹脂、ガラス、有機材料と無機材料とを複合化した材料などを用いても構わない。   The cover 50 is formed of a molded product obtained by molding a transparent material such as a silicone resin into a dome shape (hemispherical shape), and is excited by first visible light (blue light) emitted from the LED chip 1. A second fluorescent material made of a particulate green phosphor that emits third visible light (green light) that has a longer wavelength than visible light and a shorter wavelength than second visible light (red light). A second color conversion member 30 formed in a hemispherical shape is integrally formed on the inner peripheral surface facing the first color conversion member 20. The second color conversion member 30 and the cover 50 are bonded to the outside of the first color conversion member 20 with respect to the mounting substrate 10 using, for example, an adhesive (silicone resin, epoxy resin, or the like). As a result, the submount member 40 and the LED chip 1 are mounted on the mounting substrate 10 together with the first color conversion member 20. However, the transparent material used for the first color conversion member 20 and the cover 50 is not limited to a silicone resin, and for example, an acrylic resin, an epoxy resin, glass, a material in which an organic material and an inorganic material are combined, or the like may be used. I do not care.

而して、本実施形態の発光装置では、ＬＥＤチップ１から放射される第１の可視光（青色光）と、第１の色変換部材２０によって第１の可視光から色変換された第２の可視光（赤色光）と、第２の色変換部材３０によって第１の可視光から色変換された第３の可視光（緑色光）とを混色することで白色光を得ることができ、しかも、青色光と黄色光を混色する従来例に比較して、長波長領域の第２の可視光（赤色光）が増えるために演色性が向上するものである。また、第２の色変換部材３０で反射して内側に戻る第１の可視光が第１の色変換部材２０によって第２の可視光に色変換されて外側に放射されるから、色の変換効率が向上するという利点もある。さらに、第１及び第２の色変換部材２０，３０がドーム状に形成されているので、ＬＥＤチップ１から放射された第１の可視光が第１及び第２の色変換部材２０，３０に達するまでの光路長をほぼ均一にすることができ、その結果、混色光（白色光）の色むらが生じるのを抑えることができる。さらに、色変換された光がＬＥＤチップ１側に戻る量を低減することができて色変換効率が向上するという利点もある。   Thus, in the light emitting device of the present embodiment, the first visible light (blue light) emitted from the LED chip 1 and the second visible light that has been color-converted from the first visible light by the first color conversion member 20. White light can be obtained by mixing the visible light (red light) and the third visible light (green light) color-converted from the first visible light by the second color conversion member 30, Moreover, compared with the conventional example in which blue light and yellow light are mixed, the second visible light (red light) in the long wavelength region is increased, so that the color rendering is improved. Further, since the first visible light reflected by the second color conversion member 30 and returning to the inside is converted into the second visible light by the first color conversion member 20 and emitted to the outside, the color conversion is performed. There is also an advantage that efficiency is improved. Further, since the first and second color conversion members 20 and 30 are formed in a dome shape, the first visible light emitted from the LED chip 1 is applied to the first and second color conversion members 20 and 30. It is possible to make the optical path length to reach almost uniform, and as a result, it is possible to suppress the occurrence of color unevenness of mixed color light (white light). Furthermore, there is an advantage that the color conversion efficiency can be improved by reducing the amount of the color converted light returning to the LED chip 1 side.

また、本実施形態の発光装置では、第２の色変換部材３０と第１の色変換部材２０との間に空気層６０が形成されているので、第２の色変換部材３０で散乱された光（青色光）のうち、第１の色変換部材２０側へ散乱されて第１の色変換部材２０を通過する光の量を低減することができ、さらに、第２の色変換部材３０の外側には透明材料の成形品からなるカバー５０が存在するため、カバー５０が存在しない場合、すなわち、第２の色変換部材３０が直接空気に触れている場合に比較して、外側（カバー５０側）へ散乱された光（青色光）のうち、第２の色変換部材３０側に戻る光の量を低減することができ、その結果、色の変換効率が大幅に向上する。   Further, in the light emitting device of this embodiment, since the air layer 60 is formed between the second color conversion member 30 and the first color conversion member 20, the light is scattered by the second color conversion member 30. Of the light (blue light), the amount of light scattered toward the first color conversion member 20 and passing through the first color conversion member 20 can be reduced. Since there is a cover 50 made of a transparent material molded product on the outside, compared to the case where the cover 50 is not present, that is, the second color conversion member 30 is in direct contact with air, the outside (cover 50 Of the light (blue light) scattered to the second color conversion member 30 side can be reduced, and as a result, the color conversion efficiency is greatly improved.

なお、図２に示すように、シリコーン樹脂のような透明材料と第１の蛍光材料とを混合した混合物をドーム状（半球状）に成形した成形品によって第１の色変換部材２０を構成するとともに、第１の色変換部材２０でＬＥＤチップ１を封止する構造としても構わない。   In addition, as shown in FIG. 2, the 1st color conversion member 20 is comprised with the molded article which shape | molded the mixture which mixed the transparent material like a silicone resin, and the 1st fluorescence material in the dome shape (hemisphere). In addition, the LED chip 1 may be sealed with the first color conversion member 20.

本発明の実施形態を示す断面図である。It is sectional drawing which shows embodiment of this invention. 本発明の他の実施形態を示す断面図である。It is sectional drawing which shows other embodiment of this invention.

符号の説明Explanation of symbols

１ ＬＥＤチップ
１０ 実装基板（ベース部材）
２０ 第１の色変換部材
３０ 第２の色変換部材
５０ カバー 1 LED chip 10 Mounting substrate (base member)
20 First color conversion member 30 Second color conversion member 50 Cover

Claims (3)

相対的に波長の短い第１の可視光を放射するＬＥＤチップと、ＬＥＤチップが実装されたベース部材と、ベース部材におけるＬＥＤチップの実装面側に配設され第１の可視光によって励起されて第１の可視光の波長よりも波長の長い第２の可視光を放射する第１の蛍光材料を透明材料とともに成形した成形品からなる第１の色変換部材と、第１の色変換部材に対してベース部材と反対側に空気層を介在するようにして配設され第１の色変換部材を通過した第１の可視光によって励起されて第１の可視光よりも波長が長く且つ第２の可視光よりも波長の短い第３の可視光を放射する第２の蛍光材料からなる第２の色変換部材と、第２の色変換部材に対してベース部材と反対側に密着するように配設され透明材料の成形品からなるカバーとを備えたことを特徴とする発光装置。   An LED chip that emits first visible light having a relatively short wavelength, a base member on which the LED chip is mounted, and an LED chip mounting surface side of the base member that is disposed on the LED chip and excited by the first visible light. A first color conversion member made of a molded product obtained by molding a first fluorescent material emitting a second visible light having a wavelength longer than the wavelength of the first visible light together with a transparent material; and a first color conversion member On the other hand, the wavelength is longer than the first visible light by being excited by the first visible light which is disposed with the air layer interposed on the opposite side of the base member and passes through the first color conversion member, and the second. A second color conversion member made of a second fluorescent material that emits third visible light having a shorter wavelength than the visible light, and a second color conversion member that is in close contact with the second color conversion member on the side opposite to the base member And a cover made of a molded article of transparent material The light emitting device characterized in that. 第２の蛍光材料を透明材料とともに成形することで第２の色変換部材とカバーとを一体に形成したことを特徴とする請求項１記載の発光装置。   2. The light emitting device according to claim 1, wherein the second color conversion member and the cover are integrally formed by molding the second fluorescent material together with a transparent material. 第１及び第２の色変換部材並びにカバーがドーム状に形成されたことを特徴とする請求項１又は２記載の発光装置。   The light emitting device according to claim 1 or 2, wherein the first and second color conversion members and the cover are formed in a dome shape.
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