JP2004356116A - Light emitting diode - Google Patents

Light emitting diode Download PDF

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Publication number
JP2004356116A
JP2004356116A JP2003148315A JP2003148315A JP2004356116A JP 2004356116 A JP2004356116 A JP 2004356116A JP 2003148315 A JP2003148315 A JP 2003148315A JP 2003148315 A JP2003148315 A JP 2003148315A JP 2004356116 A JP2004356116 A JP 2004356116A
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emitting diode
light emitting
light
red
led element
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Hirohiko Ishii
Kazu Oishi
和 大石
廣彦 石井
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Citizen Electronics Co Ltd
株式会社シチズン電子
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means 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
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means 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
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/49Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
    • H01L2224/491Disposition
    • H01L2224/49105Connecting at different heights
    • H01L2224/49107Connecting at different heights on the semiconductor or solid-state body
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732Location after the connecting process
    • H01L2224/73251Location after the connecting process on different surfaces
    • H01L2224/73265Layer and wire connectors

Abstract

PROBLEM TO BE SOLVED: To allow color rendering properties and reproducibility to be compatible in a light emitting diode for the purpose of a white light using at least a blue light emitting diode element.
SOLUTION: The light emitting diode 20 includes, in addition to the blue light emitting diode element 5, a red light emitting diode element 6 mounted on a substrate 1, and particles 8 of a fluorescent substance for wavelength converting a blue light into a yellow light, mixed in a molding resin 10 coating the blue light emitting diode element 5 and the red light emitting diode element 6. Sufficient light emitting intensity is obtained in all visible light ranges by mixing the blue, the yellow and the red luminescences.
COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
この発明は読み取り装置やカメラ用等各種の用途に用いる照明光源、液晶パネル等表示装置のバックライトの光源、LEDデイスプレイ等に用いられる発光ダイオードに関し、特に白色発光又は又は中間色の発光を目的とした発光ダイオードに関する。 The present invention was aimed illumination light source used for such as various for reader and camera applications, backlight sources of liquid crystal panel display device, a light emitting diode used in LED Deisupurei like, in particular white light-emitting or or emission of neutral It relates to a light-emitting diode.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
発光ダイオード(以下LEDともいう。)の素子は小型で発光効率が良く、鮮やかな色の発光をする。 (Hereinafter also referred to as LED.) Light emitting diode device may luminous efficiency small, the emission of bright colors. 又、半導体素子であるために、長寿命であり、優れた駆動特性を有する。 Also, because of the semiconductor element, a long life, has an excellent driving characteristics. このため、上記した各種の用途において、特に小型、薄型に適したものとして利用されている。 Thus, in various applications as described above, it is used particularly small, as being suitable for thin. 近年、高輝度、高効率な発光ダイオードとしてRGB(赤、緑、青色)などの発光ダイオードがそれぞれ開発された。 Recently, RGB as high brightness, high efficiency light-emitting diodes (red, green, blue) light-emitting diodes, such as have been developed, respectively. これに伴いRGBの三原色を利用したLEDデイスプレイが白色および中間色の照明用として、その特徴を生かして広く用いられるようになった。 LED Deisupurei using three primary colors of RGB due to this for lighting white and neutral colors, has become widely used by taking advantage of its features.
【0003】 [0003]
発光ダイオードは使用される発光層の半導体材料、形成条件などによって、紫外から赤外までの種々の発光波長を放出させることが可能である。 LED semiconductor material of the light emitting layer used, such as by formation conditions, it is possible to release a variety of emission wavelengths from ultraviolet to infrared. 又、優れた単色性ピーク波長を有する。 Also it has excellent monochromaticity peak wavelength. よって、発光波長の異なる発光ダイオードを組み合わせることにより、所望の色の発光を得ることは原理的には可能である。 Thus, by combining different emission diode emission wavelengths, it is possible in principle to obtain a light emission of a desired color.
【0004】 [0004]
このような、発光波長の異なる発光ダイオード素子を組み合わせた発光ダイオードの一例として、R(赤色)LEDチップ(発光ダイオード素子)と、G(緑色)LEDチップと、B(青色)LEDチップとからなる多色発光素子(多色発光ダイオード)が従来より知られている(例えば特許文献1参照)。 Such, as an example of a light emitting diode which combines the different light emitting diode element having an emission wavelength, and a R (red) LED chips (light-emitting diode element), and G (green) LED chip, and B (blue) LED chip multicolor light emitting device (multi-colored LED) is conventionally known (for example, see Patent Document 1).
【0005】 [0005]
【特許文献1】 [Patent Document 1]
特開平7−15044号公報(図1) JP-7-15044 discloses (Fig. 1)
【0006】 [0006]
しかし、このような発光ダイオード素子(以下LED素子ともいう。)の組み合わせよりなる発光ダイオード(多色発光素子)に関していえば、各発光ダイオード素子すなわち、R(赤色)LEDチップと、G(緑色)LEDチップと、B(青色)LEDチップは優れた単色性ピーク波長を有するが故に、白色系発光光源などとさせるためには、演色性に欠けるという問題がある。 However, with respect to (hereinafter also referred to as LED elements.) The light emitting diode element made of a combination of light emitting diodes (multicolor light emitting devices), each of the light emitting diode elements or a R (red) LED chip, G (green) an LED chip, B because it (blue) LED chip has an excellent monochromatic peak wavelength, in order to with like the white light-emitting light source, there is a problem of lack of color rendering. ここに演色性とは、同一の物体でも照明光源が異なれば色の見えは異なるところ、ある照明光源のこの物体色の見えに及ぼす影響を、基準となる照明光源(昼の自然光等)を基準にして現したものを演色といい、この演色の特性を演色性という。 Here the color rendering property, the color appearance is different from Different illumination sources in the same object, the impact on the object color appearance of the lighting source, a primary illumination source (daylight natural light, etc.) the reference those in the reveal and good color rendering, the characteristics of the color rendering of color rendering properties. 演色性は色の見えの一致度が高いほどよいが、物体色によっても変わるので、CIEの演色性評価の方法においては、物体色として、複数種類(15種類)のものをきめておき、これらのうちの特定の数種類に対する演色性の平均値Raをもって、演色性の評価を行う。 Although the color rendering property is good higher degree of coincidence of color appearance, will also change the object color, in the method of the CIE color rendering index, as object color, keep texture things plurality of types (15 types), these with an average value Ra of color rendering for a particular several of, the evaluation of color rendering properties. 例えば上記の特許文献1の記載に類するようなRGBのLEDチップの組み合わせよりなる発光ダイオードの場合発光スペクトルは図10(a)のS1に示すようになり、RとG、GとBの間にスペクトル強度の弱い谷間が広く存在する。 For example, if the emission spectrum of the light-emitting diode comprising a combination of RGB of LED chips as similar to the above described Patent Document 1 is as shown in S1 of FIG. 10 (a), R and G, between the G and B widely existing weak valley of the spectral intensity. 特にRとGの間の谷間の領域(550〜610nm)は幅も広くスペクトル強度の落ち込みも大きい。 Especially the region of the valley between the R and G (550~610nm) is greater drop in widely spectral intensity width. 即ち自然光のスペクトル特性とは違いが大きくなる。 That difference becomes large and the spectral characteristics of natural light. そのために、演色性は低くなり、Ra=12程度となる(自然光の場合はRa=100)。 Therefore, the color rendering property is low and is about Ra = 12 (in the case of natural light Ra = 100). なお、演色性が低くなると、物体の反射光を検出するスキャナー装置等読み取り装置、その他の照明の光源として用いるには不適当となると考えられる。 Incidentally, when the color rendering property is low, a scanner device or the like reader which detects the reflected light of the object is considered to be unsuitable for use as other illumination sources.
【0007】 [0007]
さらに、かかるRGBのLEDチップ(又はLED素子)の組み合わせよりなる発光ダイオードの場合、一般にLED素子の色の種類により、素子の厚みが変わるので、色により発光面がずれ、均一な混合色を得ることが困難となるという問題もある。 Furthermore, in the case of the light emitting diode made of a combination of such RGB LED chip (or LED element), typically by the color type of the LED element, the thickness of the element is changed, the light emitting surface is displaced by the color, to obtain a uniform mixed colors it is also a problem that it becomes difficult.
【0008】 [0008]
そこで、上記の2つの問題点を改善するべく、LED素子の発光色を蛍光体で色変換させた白色発光ダイオードが開発された(例えば、特許文献2参照)。 Therefore, in order to improve the two problems described above, the white light emitting diode is a color conversion luminescent color of the LED elements in the phosphor has been developed (e.g., see Patent Document 2).
【0009】 [0009]
【特許文献2】 [Patent Document 2]
特許第2927279号公報(図1、図3) Japanese Patent No. 2927279 (FIG. 1, FIG. 3)
【0010】 [0010]
前記特許文献2に記載された白色発光ダイオードによれば、InGaN系の青色LED According to the white light emitting diode disclosed in the patent document 2, the blue LED of InGaN system
素子をリードフレーム内のカップ部分の底部に取り付けて配線し、そのカップ部分にYAG蛍光体等の蛍光体を分散させた樹脂を充填して、前記青色LED素子を被覆する構造とした(特許文献2の図1参照)。 Elements and wiring mounted on the bottom of the cup portion of the lead frame, and filled with a resin containing a dispersed fluorescent material such as YAG phosphor that cup portion has a structure for covering the blue LED element (JP see Fig. 1 of 2). これにより、例えば460nm付近にピーク波長を有する青色LED素子の発光の一部は上記の蛍光体に吸収され、ピーク波長が560nm前後の黄緑色の発光に変換される。 Thus, for example, a portion of the emission of the blue LED element having a peak wavelength around 460nm is absorbed by the phosphor of the peak wavelength is converted into light emission of yellow-green around 560 nm. この結果、この白色発光ダイオードの発光スペクトルは図10(b)のS2に示すように、ピーク波長460nmの青色LED素子からの発光と、ピーク波長が560nmの蛍光体からの発光が見られる。 As a result, the emission spectrum of the white light emitting diode as shown in S2 in FIG. 10 (b), and light emitted from the blue LED element having a peak wavelength of 460 nm, the peak wavelength emission from the phosphor of 560nm is observed. これからもわかるように、この白色発光ダイオードは可視光領域のほとんどの領域で発光するため、演色性がよく、平均演色評価数Raが80を超えている。 As now be understood, the white light emitting diode for emitting light in most regions of the visible light range, the color rendering property good, color rendering index Ra is greater than 80.
よって、前記のRGBのLEDチップの組み合わせよりなる発光ダイオードにおけるような演色性の低下の問題は改善される。 Therefore, the color rendering of the reduction of problems such as in a light-emitting diode comprising a combination of said RGB LED chip is improved.
【0011】 [0011]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
しかしながら、青色LED素子と蛍光体を備えた白色発光ダイオードについても以下に述べるような問題がある。 However, there are the following problems for the white light emitting diode with a blue LED element and a phosphor. すなわち、図10(b)のS2に示す発光スペクトルからもわかるように、赤色の領域のうち特に波長が630nmを超える領域においては、発光スペクトルの強度が他の波長領域(可視光)における発光スペクトルの強度と比較してかなり低下している。 That is, as can be seen from the emission spectra shown in S2 in FIG. 10 (b), in the region where particular wavelength exceeds 630nm of red region, the emission spectrum intensity of the emission spectrum in the other wavelength region (visible light) It has been significantly reduced as compared to the strength of the. よって、かかる赤色領域における再現性に欠けることとなる。 Therefore, so that the lack of reproducibility in such red region. 例えば、赤色領域における物体色を有する照明対象を照明した場合、その反射光の赤色成分は、自然光で照明した場合に比して大幅に低下し、反射光の再現性が欠けることとなる。 For example, when illuminating an illumination target having an object color in the red region, the red component of the reflected light is greatly reduced as compared with the case of illumination by natural light, so that the lack reproducibility of the reflected light. 本発明は▲1▼このような青色LED(GaN系青色LED)素子と蛍光体(YAG系蛍光体)を組合わせた従来の白色LEDにおける再現性の欠如の問題、▲2▼R、G、Bの3色のLED素子を組み合わせてなる白色LED素子におけるような、上記した演色性欠如の問題と素子の厚みの違いに起因して生ずる混合色の不均一性の問題がなくなるように改善することを解決すべき課題とする。 The invention ▲ 1 ▼ such blue LED (GaN-based blue LED) element and a phosphor (YAG phosphor) reproducibility of the lack of problems in the conventional white LED which combined, ▲ 2 ▼ R, G, such as in the white LED device comprising a combination of three color LED elements of B, and improves as the above-mentioned color rendering lack of problems and elements mixed color resulting due to the difference in thickness of the non-uniformity problem is eliminated the problem to be solved that.
【0012】 [0012]
【課題を解決するための手段】 In order to solve the problems]
上記の課題を解決するためにその第1の手段として本発明は、発光ダイオードにおいて、青色発光ダイオード素子と蛍光体の他に、赤色波長の発光ダイオード素子を備えたことを特徴とする。 The present invention as the first means for solving the aforementioned problem, in a light-emitting diode, in addition to the blue light emitting diode element and a phosphor, characterized by comprising a light emitting diode element in the red wavelength.
【0013】 [0013]
上記の課題を解決するためにその第2の手段として本発明は、前記第1の手段において、赤色波長の発光ダイオード素子のピーク波長は615nm乃至680nmであることを特徴とする。 The present invention as the second means in order to solve the above problems, in the first means, the peak wavelength of the light emitting diode device of the red wavelength is characterized by a 615nm to 680 nm.
【0014】 [0014]
上記の課題を解決するためにその第3の手段として本発明は、発光ダイオードにおいて、R、G、Bの3色の発光ダイオード素子の他に、これらの発光ダイオード素子とはピーク波長の異なるY(YG)及び又はR領域又は赤外領域の発光ダイオード素子を備えたことを特徴とする。 The present invention as the third means for solving the aforementioned problem, in a light-emitting diode, R, G, in addition to the three colors of light-emitting diode device B, Y of different peak wavelengths and the light-emitting diode element (YG) and or comprising the light emitting diode element of the R region, or infrared region.
【0015】 [0015]
上記の課題を解決するためにその第4の手段として本発明は、互いに発光色の異なる複数の発光ダイオード素子を有する発光ダイオードにおいて、実効的な発光面の高さを揃えることにより、均一な混色を可能することを特徴とする。 The present invention as the fourth means for solving the aforementioned problem, in a light-emitting diode having a plurality of light emitting diode elements having different emission colors from each other, by aligning the height of the effective light-emitting surface, uniform color mixing characterized in that it enables.
【0016】 [0016]
上記の課題を解決するためにその第5の手段として本発明は、前記第4の手段の発光ダイオードにおいて、発光ダイオード素子を搭載する基板に凹部を設け、該凹部に複数の発光ダイオード素子のうちの少なくとも1つを固定することにより、実効的な発光面の高さを揃えることを特徴とする。 The present invention as the fifth means for solving the aforementioned problem, in a light-emitting diode of the fourth means, the concave portion is provided on the substrate for mounting the light emitting diode elements among the plurality of light emitting diode elements in the recess by securing at least one of the, and wherein the aligning the height of the effective light-emitting surface.
【0017】 [0017]
上記の課題を解決するためにその第6の手段として本発明は、前記第4の手段の発光ダイオードにおいて、発光ダイオード素子を搭載する基板にスペーサー(メタル座布団)を設け、該スペーサーの上に複数の発光ダイオード素子のうちの少なくとも1つを固定することにより、実効的な発光面の高さを揃えることを特徴とする。 The present invention as the sixth means for solving the aforementioned problem, in a light-emitting diode of the fourth means, the spacer (the metal cushion) provided on the substrate for mounting a light-emitting diode element, a plurality on top of the spacer by fixing at least one of the light emitting diode element, and wherein the aligning the height of the effective light-emitting surface.
【0018】 [0018]
上記の課題を解決するためにその第7の手段として本発明は、前記第4の手段の発光ダ前記発光ダイオードにおいて、少なくとも1つの発光ダイオード素子の素子ベースの一部を除去することにより、実効的な発光面の高さを揃えることを特徴とする。 The present invention as the seventh means for solving the aforementioned problem, in a light-emitting da said light emitting diode of the fourth means, by removing a portion of the element based at least one light emitting diode element, the effective characterized in that to align the height of the luminescence surface.
【0019】 [0019]
上記の課題を解決するためにその第8の手段として本発明は、前記第1の手段乃至第3の手段のいずれかの発光ダイオードにおいて、互いに発光色の異なる複数の発光ダイオード素子の、実効的な発光面の高さを揃えることにより、均一な混色を可能することを特徴とする。 The present invention as the eighth means for solving the aforementioned problem, in the first means to one of the light emitting diode of the third means, a plurality of different light emitting diode elements having light emitting colors from each other, the effective by aligning the height of the Do-emitting surface, characterized in that it allows a uniform color mixing.
【0020】 [0020]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
以下に本発明の第1実施形態につき図面を用いて説明する。 It will be described with reference to the drawings a first embodiment of the present invention are described below. 図1は本第1実施形態に係る白色用発光ダイオード20の構成を示す図であり、図1(a)は上面図、図1(b)は図1(a)のA−A断面図である。 Figure 1 is a diagram showing the structure of a white light emitting diode 20 according to the first embodiment, FIG. 1 (a) is a top view, in A-A cross-sectional view of FIG. 1 (b) FIGS. 1 (a) is there. 図1において、1はガラス繊維入りのエポキシ樹脂よりなる矩形状の基板であり、2、3、4はそれぞれ前記基板1にパターン形成された外部接続用の電極であり、2は負電圧を加える共通電極パターン、3は青色用電極パターン、4は赤色用電極パターンである。 In Figure 1, 1 is a rectangular substrate made of glass fiber epoxy resin, 2, 3, 4 is an electrode for external connection are patterned respectively on the substrate 1, 2 applies a negative voltage the common electrode pattern, 3 blue electrode pattern 4 is red electrode pattern. 5は青色光を発光する青色LED素子(青色発光ダイオード素子)、6は赤色光を発光する赤色LED素子(赤色発光ダイオード素子)である。 5 blue LED element that emits blue light (blue light emitting diode element), 6 is the red LED element emitting red light (red light-emitting diode element). 青色LED素子5はGaN系のpn半導体層を絶縁サファイア基板上に形成してなるものであるが、サファイア絶縁基板5cを前記前記共通電極パターン2に接着固定し、青色LED素子5のn層電極5bを結線手段(ボールボンダー等)により共通電極パターン2接続し、青色LED素子5のp層電極5aを結線手段により青色用電極パターン3に接続する。 Although the blue LED element 5 is made by forming a pn semiconductor layer of GaN based on an insulating sapphire substrate, the adhesive secures the sapphire insulating substrate 5c to said common electrode pattern 2, n-layer electrode of the blue LED element 5 5b common electrode pattern 2 are connected by the connection means (ball bonder, etc.), it connects the p-layer electrode 5a of the blue LED element 5 to the blue electrode pattern 3 by connection means. p−n接合タイプの赤色LED素子6のn層6bをAgペースト7を介して前記共通接続電極2に接続し、赤色LED素子6のp層電極6aを結線手段により赤色用電極パターン4に接続する。 The n layer 6b of p-n junction type red LED element 6 through the Ag paste 7 is connected to the common connection electrode 2, connecting the p-layer electrode 6a of the red LED element 6 to the red electrode pattern 4 by connection means to.
【0021】 [0021]
このようにして、基板1上に取り付けられ、接続がなされた青色LED素子5および赤色LED素子6の上を、粒子状のYAG蛍光体8をエポキシ樹脂あるいはシリコン樹脂よりなる樹脂基材9内に混入、分散させてなる被覆樹脂部材10でモールドして覆う。 Thus, mounted on the substrate 1, the upper connection of the blue LED element 5 and the red LED element 6 has been made, in the resin substrate 9 made of particulate YAG phosphor 8 of epoxy resin or silicon resin mixed, covered and molded with resin coating member 10 is dispersed. 被覆樹脂部材10は、前記共通電極パターン2、青色用電極パターン3、赤色用電極パターン4の引き出し部を残して基板1の上面に略直方体形に形成される。 Resin coating member 10, the common electrode pattern 2, blue electrode pattern 3 is formed in a substantially rectangular shape on the upper surface of the substrate 1 while leaving the lead portion of the red electrode pattern 4.
【0022】 [0022]
前記の前記共通電極パターン2、青色用電極パターン3、赤色用電極パターン4の引き出し部を図示しない回路基板の配線に接続し、共通電極パターン2に負電圧を加え、青色用電極パターン3および赤色用電極パターン4にそれぞれ所要の正電圧を加えると、一例として、青色LED素子5はピーク波長が略480nmの青色光を発光し、赤色LED素子6はピーク波長が略650nmの赤色光を発光する。 The common electrode pattern 2 described above, blue electrode pattern 3 is connected to the lead portion of the circuit board (not shown) the wire of the red electrode pattern 4, a negative voltage is applied to the common electrode pattern 2, blue electrode pattern 3 and the red the addition of each required positive voltage to use the electrode patterns 4, as an example, the blue LED element 5 emits blue light of about 480nm peak wavelength, a red LED element 6 is the peak wavelength of emitting red light of approximately 650nm . ここで、前記青色光の一部は、前記樹脂基材9中に分散させられたYAG蛍光体8に吸収されてこれを励起し、ピーク波長が略580nmの黄色光の発光をする。 Here, some of the blue light, the is absorbed by the YAG phosphor 8 which is dispersed in a resin base material 9 to excite it, peak wavelength emission of yellow light of approximately 580 nm. なお、前記青色光のうちYAG蛍光体8に吸収されない部分は青色光として残っている。 The portion that is not absorbed by the YAG phosphor 8 of the blue light remains as a blue light. このようにして、本第1実施形態に係る白色用発光ダイオード20においては、前記の青色光、黄色光、赤色光が混色された形で外部に出射する。 In this manner, the present in the white light-emitting diode 20 according to the first embodiment, the blue light is emitted to the outside in the yellow light, form the red light is mixed.
【0023】 [0023]
ここで、図5および図6は本第1実施形態に関連する発光のスペクトルを示す図であり、図5(a)は図1の発光ダイオード20において青色LED素子5のみを発光させた場合のスペクトルSbを示す図、図5(b)は発光ダイオード20において赤色LED素子6のみを発光させた場合のスペクトルSrを示す図である。 Here, FIGS. 5 and 6 are views showing a spectrum of light emission associated with the first embodiment, FIG. 5 (a) in the case where light is emitted only the blue LED element 5 in the light emitting diode 20 of FIG. 1 shows the spectrum Sb, FIG. 5 (b) is a diagram showing a spectrum Sr in the case where light is emitted only red LED element 6 in the light emitting diode 20. 図6は発光ダイオード20において青色LED素子5および赤色LED素子6を共に発光させた場合のスペクトルS10を示す図である。 6 is a diagram showing the spectrum S10 in the case where both emit light blue LED element 5 and the red LED element 6 in the light emitting diode 20. 図1に示す青色電極パターン3のみに正電圧を加えることにより青色LED素子5のみを発光させた場合、YAG蛍光体8の存在により、すでに述べた原理により、黄色光も励起され、図5(a)のスペクトルSbは略480nmのピーク波長を有する急峻なスペクトルと略580nmのピーク波長を有するなだらかなスペクトルが合成されて、つながった形となっている。 If light is emitted only the blue LED element 5 by applying a positive voltage only to the blue electrode pattern 3 shown in FIG. 1, the presence of the YAG phosphor 8, according to the principle already mentioned, the yellow light is also excited, 5 ( spectrum Sb of a) is being gentle spectrum synthesis having a peak wavelength of steep spectrum substantially 580nm with a peak wavelength of approximately 480 nm, and has a linked form. この場合は、従来例として特許文献2に示された青色発光ダイオード素子と蛍光体を有する従来の発光ダイオードのスペクトル特性(図10(b)のS2参照)に対応、近似するものである。 In this case, corresponding to the spectral characteristics of a conventional light emitting diode having a blue light emitting diode element and a fluorescent material disclosed in Patent Document 2 as a conventional example (S2 see FIG. 10 (b)), is intended to approximate. 図1に示す赤色電極パターン4のみに正電圧を加えることにより赤色LED素子6のみを発光させた場合の発光のスペクトルは図5(b)のスペクトルSrに示すようにピーク波長が略650nmの急峻なスペクトルとなる。 Spectrum of light emitted when light is emitted only red LED element 6 by applying a positive voltage only to the red electrode pattern 4 shown in FIG. 1 is sharply approximately 650nm peak wavelength as shown in the spectrum Sr shown in FIG. 5 (b) It becomes such spectrum.
【0024】 [0024]
図1に示す発光ダイオード20において、青色LED素子5および赤色LED素子6を共に発光させた場合の発光のスペクトルは図6のS10に示すように、図5(a)に示すスペクトルSbと、図5(b)に示すスペクトルSrが合成された形となり、ピーク波長が略480nmの青色のスペクトルとピーク波長が略670nmの赤色のスペクトルの間が略580nmのピーク波長を有するなだらかなスペクトルにより埋められている形となる。 In the light emitting diode 20 shown in FIG. 1, the spectrum of light emitted when both emit light blue LED element 5 and the red LED element 6 as shown in S10 of FIG. 6, the spectrum Sb shown in FIG. 5 (a), FIG. 5 (b) spectrum Sr as shown in is the form that is synthesized, filled with the gentle spectrum blue spectrum and the peak wavelength of the peak wavelength substantially 480nm there is between the spectrum of the red of about 670nm with a peak wavelength of approximately 580nm the form to have. よって、可視光領域においては、スペクトルの落ち込みは少なく、演色性は高くなるとともに、赤色領域においてもスペクトルの強度が、赤色LED素子6の存在により従来よりも格段に補強されているため、再現性に優れたものとなる。 Therefore, in the visible light region, the drop in the spectrum is small, with color rendering is high, because the intensity of the spectrum even in the red region is reinforced remarkably than conventionally by the presence of the red LED element 6, repeatability and it is excellent in.
【0025】 [0025]
なお、発光ダイオード10の発光色は混色の結果、白色となるように、前記の青色光、黄色光、赤色光の強度の比率が設定されている。 The emission color of the light emitting diode 10 as a result of color mixing, so that the white, the blue light, yellow light, the ratio of the intensity of the red light is set. ここで、青色光の強度を基準として、黄色光の強度はYAG蛍光体8の含有量により調整することができ、赤色光の強度は赤色電極パターン4に加える正電圧により調整することができる。 Here, based on the intensity of the blue light, the intensity of the yellow light can be adjusted by the content of the YAG phosphor 8, the intensity of the red light can be adjusted by a positive voltage applied to the red electrode pattern 4.
【0026】 [0026]
以下に、青色LED素子とYAG蛍光体のみよりなる従来の白色発光ダイオードとして、スペクトル特性が図5(a)のSbのもの(以下whiteとする。)と、本第1実施形態として、さらに赤色LED素子を有するものとして、スペクトル特性が図6のS10のもの(以下white+Redとする。)につき、CIEの演色評価数Raおよび特殊演色評価数R9〜R15を対比した値を表1に示す。 Below, as a conventional white light emitting diode made of only the blue LED element and YAG fluorescent material, the spectral characteristics those Sb in FIGS. 5 (a) and (hereinafter referred to as white.), As the first embodiment, further red as having an LED element, spectral properties (or less white + Red.) S10 of that of Figure 6 per indicates a value of comparing color rendering index Ra and the special color rendering index R9~R15 the CIE in Table 1.
【表 1】 [Table 1]
表1に示すように本第1実施形態の発光ダイオード(white+red)は従来の白色発光ダイオード(white)に比較して、特殊演色評価数R9〜R15において向上が見られ、特にR9においては ー19.4 から 87.0へと顕著な向上が見られ、このことからも赤色領域おける再現性が大幅に向上していることがわかる。 As shown in Table 1 the first embodiment of a light emitting diode (white + red) is compared with the conventional white light emitting diode (white), seen improvement in the special color rendering index R9~R15, chromatography in particular R9 19 significant improvement is seen from .4 to 87.0, it can be seen that the reproducibility of definitive red region is significantly improved also from this fact. なお、white+redはwhiteに比して図6のS10に示すように可視光の波長領域でスペクトルの欠落部がほとんどなくなっているので、CIEの試験色NO. Incidentally, white + red because missing part of the spectrum in the wavelength region of visible light, as shown in S10 in FIG. 6 in comparison with the white is almost gone, CIE test colors NO. 1〜NO. 1~NO. 8に対する演色評価数の平均である演色評価数Raについても、74.9 から 89.4 へと向上し、良好な値となっている。 For color rendering index Ra is an average of the color rendering index also for 8, improved from 74.9 to 89.4, and has a favorable value.
【0027】 [0027]
このように、本第1実施の形態の発光ダイオードはGaN系青色LED素子とYAG蛍光体に赤色波長を有するLED素子を組み合わせることにより、あらゆる領域における再現性を高めることができる。 Thus, the light emitting diode of the first embodiment by combining the LED element having a red wavelength into GaN-based blue LED element and YAG fluorescent material, it is possible to enhance the reproducibility in all areas. 又、表1には示していないが、色温度Tcについては、whiteの場合は Tc=7738.0 、 white+redの場合はTc=6521.1 となっており、いずれも5000以上であるので、CIEの方式に従がい、基準の光としてCIE昼光を用いて上記の演色の評価を行った。 Although not shown in Table 1, for the color temperature Tc, in the case of white Tc = 7738.0, in the case of white + red has a Tc = 6521.1, since they are at least 5000, CIE従Gai the method, using the CIE daylight as a reference light was evaluated of the color rendering. なお、上記に示した具体例においては、赤色LED素子のピーク波長は650nmとなっているが、本第1実施形態はこれに限らずピーク波長が615〜680nmの赤色LED素子を用いることにより、同様の効果を得ることができる。 In the specific example shown in the above, the peak wavelength of the red LED element has a 650 nm, the first embodiment has a peak wavelength is not limited thereto by using a red LED element 615~680Nm, it is possible to obtain the same effect.
【0028】 [0028]
次に参考までに、前記のwhite+redの発光ダイオードの光学特性をwhiteの発光ダイオードと比較したデータを表2に示す。 Next reference, shows data comparing the optical characteristics of the light emitting diodes of said white + red and white light emitting diode in Table 2.
【表2】 [Table 2]
ここで、λd は主波長といわれるものである。 Here is what is referred to λd the main wavelength. purityは色純度といわれるもので、CIE色度図において、単色光である前記主波長λdへの近似度を示す数値であり、これが小さいほど混色の程度が大となる。 purity than what is referred to as color purity, in the CIE chromaticity diagram, a numerical value indicating the closeness to the main wavelength λd is monochromatic light, the degree of color mixture becomes large enough it is small. IVは光度を示す記号であり、ミリカンデラ(mcd)を単位として現したものである。 IV is a symbol indicating the luminous intensity, in which revealed millicandelas the (mcd) as a unit. x、yはCIE色度図の座標である。 x, y are the coordinates of the CIE chromaticity diagram.
表2からわかるように、本第1実施形態の発光ダイオード(white+red)の発光は十分に色純度が低く、光度も十分に高く、色度が略白色のものが得られている。 As can be seen from Table 2, emission of the first embodiment of a light emitting diode (white + red) is sufficiently low color purity, luminous intensity also sufficiently high, that chromaticity of substantially white is obtained. このように、本第1実施形態によれば、広範囲で再現性が高まり、より自然色に近い色を表現することが可能である。 Thus, according to the first embodiment, a wide range in increased reproducibility, it is possible to express the colors closer to natural colors.
【0029】 [0029]
なお、本第1実施形態の発光ダイオードの色度は上記のような略白色のものに限定されるものではない。 Note that the chromaticity of the light emitting diode of the first embodiment is not intended to be limited to the substantially white as described above. すなわち、赤色LED素子6を組み込むことにより演色性が高められているので、例えば、青色LED素子5に加える電圧を調整することにより、演色性、再現性を保持したまま、色調についてかかなり自由に調整することができる。 That is, since the color rendering property is enhanced by incorporating a red LED element 6, for example, by adjusting the voltage applied to the blue LED element 5, while maintaining color rendering properties, reproducibility, tone or fairly freely about it can be adjusted.
【0030】 [0030]
更には、図示は省略するが、本第1実施形態の変形例として、赤色LED素子6に追加して、又はこれに置き換えて赤外領域のLED素子を組み合わせることもできる。 Furthermore, not shown, as a modification of the first embodiment, in addition to the red LED element 6, or it is also possible to combine the LED element in the infrared region by replacing. この場合は赤外領域の再現性が向上し、例えば、いわゆるナイトショットに対応する照明光源として利用できるようになる。 In this case, to improve the reproducibility of the infrared region, for example, available as illumination light sources corresponding to the so-called night shot.
【0031】 [0031]
以下に、本発明の第2実施形態につき図面を用いて説明する。 It will be described below with reference to the accompanying drawings a second embodiment of the present invention. 図2は本第2実施形態に係る発光ダイオード30の構成を示す図であり、図2(a)は上面図、図2(b)は図2(a)のB−B断面図である。 Figure 2 is a diagram showing a structure of a light emitting diode 30 according to the second embodiment, FIG. 2 (a) is a top view, B-B sectional view of FIG. 2 (b) Fig. 2 (a). 図2において、11は基板1に設けられた凹部であり、この部分にも共通電極パターン2の一部が設けられ、凹部11部以外の基板1の部分に設けた共通電極パターン2とつながっている。 2, 11 is a recess provided in the substrate 1, this portion is also provided a part of the common electrode pattern 2, connected to the common electrode pattern 2 which is provided in the portion of the substrate 1 other than the recesses 11 parts there. 赤色LED素子6のn層6bをAgペースト7を介して凹部11内の共通電極パターン2の上に接続し、赤色LED素子6のp層電極6aを結線手段により赤色用電極パターン4に接続する。 The n layer 6b of the red LED element 6 through the Ag paste 7 is connected on the common electrode pattern 2 in the recess 11, connecting the p-layer electrode 6a of the red LED element 6 to the red electrode pattern 4 by connection means . 他の構成は図1に示す発光ダイオード10と同様である。 Other configurations are the same as the light emitting diode 10 shown in FIG. ここで、例えば赤色LED素子6の高さは0.3mm、青色LED素子5の高さは0.1mm、凹部11の深さは0.2mmである。 Here, for example, the height of the red LED element 6 is 0.3 mm, the height of the blue LED element 5 is 0.1 mm, the depth of the recess 11 is 0.2 mm. よって、図1に示すような構成の場合には、赤色LED素子6と青色LED素子5の高さが揃わず、赤色LED素子6が0.2mmばかり飛び出していた。 Therefore, in the case of the configuration shown in FIG. 1 are not aligned the height of the red LED element 6 and the blue LED element 5, the red LED element 6 had jumped out only 0.2 mm. これに対し、本第2の実施形態にいては、図3に示すように凹部11を設けることにより、その深さ(0.2mm)の分だけ赤色LED素子6が引っ込み、赤色LED素子6と青色LED素子5の基板1からの高さは同一(0.1mm)の高さに揃えることができる。 In contrast, iterator to the second embodiment, by providing the concave portion 11 as shown in FIG. 3, the red LED element 6 is retracted by the amount of its depth (0.2 mm), and the red LED element 6 height from the substrate 1 of the blue LED element 5 can be aligned to the height of the same (0.1 mm). この結果、混色が均一に行われ、場所に拘わらず均一な発光色が得られる。 As a result, color mixing is carried out uniformly, a uniform emission colors can be obtained regardless of location. すなわち、本第2実施形態によれば、図1に示した第1実施形態と同様に広範囲で再現性を高め、より自然色に近い色を表現することを可能とするとともに、更に発光色の均一性が向上し、照明光がひろがっても、場所にかかわらず均一な色合の照明光を得ることができる。 That is, according to the second embodiment, increasing the first embodiment and the reproducibility in a wide range in the same manner shown in FIG. 1, along with making it possible to express a color closer to natural color, further emission color of improved uniformity, even illumination light spreads, it is possible to obtain illumination light having a uniform color tone regardless of location.
【0032】 [0032]
以下に本発明の第3実施形態につき図面を用いて説明する。 It will be described with reference to the accompanying drawings third embodiment of the present invention are described below. 図3は本第3実施形態に係る発光ダイオード40の構成を示す図である。 Figure 3 is a diagram showing a structure of a light emitting diode 40 according to the third embodiment. 図3において、12は基板1の上の共通電極パターン2上に固着されたスペーサーとしてのメタル座布団である。 3, 12 is a metal cushion as anchored spacers on the common electrode pattern 2 on the substrate 1. そのメタル座布団12の上に青色LED素子5の絶縁サファイア基板5cを接着固定する。 An insulating sapphire substrate 5c of the blue LED element 5 is bonded and fixed onto the metal cushion 12. 青色LED素子5のn層電極5bを結線手段により共通電極パターン2に接続し、p層電極5aを結線手段により、青色用電極パターン3に接続する。 Connected to the common electrode pattern 2 by connection means n-layer electrode 5b of the blue LED element 5, by connecting means p-layer electrode 5a, connected to the blue electrode pattern 3. 他の構成は図1に示す発光ダイオード200と同様である。 Other configurations are the same as in light-emitting diode 200 shown in FIG. ここで、メタル座布団の厚みが例えば0.2mmであり、赤色LED素子6の高さは0.3mm、青色LED素子5の高さは0.1mmである場合には、赤色LED素子6と青色LED素子5の基板1からの高さは同一(0.3mm)の高さに揃えることができる。 Here, a thickness of for example 0.2mm metal cushion, when the height of the red LED element 6 is 0.3 mm, the height of the blue LED element 5 is 0.1mm, the red LED element 6 and the blue height from the substrate 1 of the LED element 5 can be aligned to the height of the same (0.3 mm). この結果、混色が均一に行われ、場所に拘わらず均一な発光色が得られ、図2に示した第2実施形態と同様の効果を得ることができる。 As a result, color mixing is carried out uniformly, irrespective of the location uniform emission colors can be obtained, it is possible to obtain the same effect as in the second embodiment shown in FIG.
【0033】 [0033]
以下に本発明の第4実施形態につき図面を用いて説明する。 It will be described with reference to the accompanying drawings fourth embodiment of the present invention are described below. 図4は本第4実施形態に係る発光ダイオードに使用する赤色LED素子の高さを揃える方法を示す図である。 Figure 4 is a diagram showing a method of aligning the height of the red LED element used in the light-emitting diode according to the fourth embodiment. 図4(a)は赤色LED素子6の通常品を示す図である。 4 (a) is a diagram showing a normal product of the red LED element 6. この場合n層の素子ベース6bとp層6cの間にpn接合の活性層6dが存在する(p層6cにはp層電極6aが取り付けられている。)。 In this case the active layer 6d of the pn junction between the element base 6b and p layer 6c of the n layer is present (p-layer electrode 6a is attached to the p layer 6c.). この赤色LED素子6の通常品は、すでに述べたように青色LED素子よりも高さが高いので、図4(b)に示すように、赤色LED素子6のn層の素子ベース6bの一部(点線の部分)を機械的方法又は化学的方法により除去することにより、その除去後の赤色LED素子6Bの高さを青色LED素子の高さと揃えることができる。 Usually products of the red LED element 6, since the already height greater than the blue LED element as mentioned, as shown in FIG. 4 (b), part of the element base 6b of the n layer of the red LED element 6 is removed by mechanical or chemical methods (the dotted portion of the), it is possible to align the height of the red LED element 6B after the removal to the height of the blue LED element. このような赤色LED素子6Bを図1に示す赤色LED素子6の代わりに用いて、図1に示す発光ダイオード20と同様の接続により発光ダイオードを構成すれば、青色発光LED素子と赤色LED素子の基板1からの高さは同一となり、すでに説明した原理により、混色が均一に行われ、場所にか拘わらず均一な発光色が得られ、図3に示した第3実施形態と同様の効果を得ることができる。 Such red LED element 6B used in place of the red LED element 6 shown in FIG. 1, when forming the light emitting diode in the same connected to the light emitting diode 20 shown in FIG. 1, a blue LED element and the red LED element height from the substrate 1 becomes equal, according to the principle already described, color mixing is carried out uniformly, location or uniform emission color regardless is obtained, the same effects as in the third embodiment shown in FIG. 3 it is possible to obtain. なお、図4に示した赤色LED素子6はp層(6c)に電極がとりつけられ、n層6bは電極が取り付けられていない基板となっているが、逆にn層に電極が取り付けられ、p層が電極が取り付けられていない基板となっている構造の赤色LED素子においては、p層の基板を除去することにより、上記したのと同様の効果を得ることができる(但し、n層の電極には負電圧を、p層の基板には正電圧を加える必要がある。)。 Incidentally, the red LED element 6 shown in Figure 4 electrodes attached to the p-layer (6c), n layer 6b is has a substrate with an electrode is not attached, the electrode is attached to the n layer conversely, in the red LED device having the structure p layer is a substrate not attached electrodes, by removing the substrate of the p layer, it is possible to obtain the same effect as that described above (however, the n layer the electrode negative voltage, the substrate of the p-layer is necessary to apply a positive voltage.).
【0034】 [0034]
以下に本発明の第5実施形態に係る発光ダイオードつき図面を用いて説明する。 It is described using the light-emitting diode with the drawings according to a fifth embodiment of the present invention are described below. 図7および図8は本第5実施形態に係る発光ダイオード50の構成を示す図である。 7 and 8 are diagrams showing a structure of a light emitting diode 50 according to the fifth embodiment. 発光ダイオード50は、5本の足ピン22b、25b、26r、27g、28yを備えたステム32の上にそれぞれ青色、緑色、赤色及び黄色の発光をするLED素子を配置してなるいわゆるフルカラーの発光ダイオードである。 Emitting diode 50, five legs pins 22b, 25b, 26r, 27 g, respectively blue on a stem 32 having a 28y, green light emission of red and a so-called full-color formed by arranging the LED elements of the light emission of yellow it is a diode. ここで、35bは青色LED素子、36rは赤色LED素子、37gは緑色LED素子、38yは黄色LED素子である。 Here, 35b is a blue LED element, 36r red LED elements, 37 g green LED element, 38y is yellow LED element. ここで、青色LED素子35bはステム32の中央部にメタル座布団12を介して接着固定されている。 Here, the blue LED element 35b is bonded via a metal cushion 12 in the central portion of the stem 32. p−n接合タイプの赤色LED素子36r、緑色LED素子37g、黄色LED素子38yはステム32上で中央部を囲むようにして配置され、これらのLED素子のn層をAgペースト等導電性接着剤を介してステム32側に電気的に接続する。 p-n junction type red LED element 36r, the green LED element 37 g, the yellow LED element 38y are arranged so as to surround the central portion on the stem 32, the n layer of the LED element through the Ag paste such as a conductive adhesive electrically connected to the stem 32 side Te. 足ピン22bはステム32に電気的に接続されており負電極が一体的に形成されている。 Foot pin 22b negative electrode is electrically connected to the stem 32 are formed integrally. この足ピン22bに青色LED素子35bのn層電極が結線される。 n-layer electrode of the blue LED element 35b is connected to the foot pin 22b. 一方、青色LED素子35b、赤色LED素子36r、緑色LED素子37g、黄色LED素子38yの各LED素子のp層電極(Au電極)は、ステム32と絶縁された電極端子としての足ピン25b、26r、27g、28yとそれぞれボールボンダー等の結線手段により結線され、正電極がそれぞれ形成される。 On the other hand, the blue LED element 35b, the red LED element 36r, the green LED element 37 g, p-layer electrode of each LED element of the yellow LED element 38y (Au electrode), the stem 32 and the foot pin 25b as isolated electrode terminals, 26r , 27 g, is connected by connection means such as 28y respectively ball bonder, a positive electrode is formed, respectively. 次に図8に示すように、このような結線の上に透光性樹脂によるモールド45が形成される。 Next, as shown in FIG. 8, the mold 45 by the translucent resin is formed on such a connection.
【0035】 [0035]
このような構成において、共通な負電極である足ピン22bと正電極である足ピン25b、26r、27g、28yとの間にそれぞれ電圧を印加することにより、発光ダイオード50は青色、緑色、赤色の他に黄色の発光が互いの混色してなるフルカラーの発光を出射する。 In such a configuration, the foot pin 25b is foot pin 22b and the positive electrode is a common negative electrode, 26r, 27 g, by applying a respective voltage between 28y, light emitting diode 50 is a blue, green, red in addition to the yellow luminescent emits a luminous full color made by mixing each other's. ここで、例えば、青色LED素子35b、緑色LED素子37g、黄色LED素子38y、赤色LED素子36rの各ピーク波長がそれぞれ、470nm、540nm、590nm、660nmのものを用いた場合、これらが混色されてなる発光ダイオード50の発光のスペクトルは図9のS50に示される。 Here, for example, a blue LED element 35b, a green LED element 37 g, the yellow LED elements 38y, each respective peak wavelengths of the red LED element 36r, 470 nm, 540 nm, 590 nm, when used as the 660 nm, it is mixed spectra of light-emitting diode 50 made are shown in S50 in FIG. これによれば、図10(a)のS1に示す従来のRGBのフルカラーの発光のスペクトルに比較して、赤色と緑色の間のスペクトルの落ち込みが大幅に減少している。 According to this, compared to the spectrum of emission of the conventional RGB full color shown in S1 of FIG. 10 (a), the spectrum of the drop between the red and green are greatly reduced. このために、自然光への近似度が高まり、従来よりも演色性が向上する。 Therefore, increased degree of approximation to the natural light, the color rendering property is improved than before. 又、本第5実施形態の発光ダイオードの発光のスペクトルは、図9のS50に示すように、赤色の領域において十分に高いスペクトル強度を有しているので、青色LED素子と蛍光体を備えた従来の発光ダイオードの発光スペクトル(図10(b)のS2)と比較した場合に赤色領域におけるスペクトル強度が顕著に増加しており、このため、従来よりも赤色領域における再現性が向上している。 Also, the spectrum of the light-emitting diode of the fifth embodiment, as shown in S50 in FIG. 9, since it has a sufficiently high spectral intensity in the red region, with a blue LED element and a phosphor spectral intensity in the red region when compared to the emission spectrum (S2 in FIG. 10 (b)) of a conventional light emitting diode are significantly increased, Therefore, the improved reproducibility in the red region than conventional . なお、上記の事例においては、黄色LED素子としてピーク波長がYの領域のものを用いたが、本第5実施形態はこれに限るものではなく、場合に応じてYからYGにかけての波長のものを使用を使用することができる。 In the above example, the peak wavelength as a yellow LED element is used as the area of ​​Y, those present fifth embodiment is not limited thereto, from Y as the case of the wavelength of the over the YG it is possible to use a use.
【0036】 [0036]
なお、本第5実施形態においては、他のLED素子と比較して、高さの低い青色LED素子35bをメタル座布団12を介してステム32に固定することにより、すべてのLED素子のステム32の面からの高さが略等しくなるように固定されている。 The present in the fifth embodiment, as compared with the other LED elements, the low blue LED element 35b height by fixing the stem 32 through the metal cushion 12, the stem 32 of all the LED elements height from the surface is fixed to be substantially equal to each other. これにより、R、G、B、Y(黄色)の混色が均一に行われ、場所にかかわらず均一は発光色を得ることができる。 Thus, R, G, B, color mixing of Y (yellow) is performed uniformly, evenly regardless of where it is possible to obtain the emission color.
【0037】 [0037]
本第5実施形態の場合も、黄色LED素子38を組み込むことにより演色性が高められているので、例えば、他のLED素子に加える電圧を調整することにより、演色性、再現性を保持したまま、色調については白色を含め、ほぼ任意の色に調整することができる。 Also in this fifth embodiment, since the color rendering property is enhanced by incorporating a yellow LED element 38, for example, by adjusting the voltage applied to the other LED elements, while maintaining color rendering properties, reproducibility , including white color tone can be adjusted to almost any color.
【0038】 [0038]
本第5実施形態の変形例として、図示は省略するが、上記の赤色LED素子(36r)の他にこれとは波長の異なる赤色領域又は赤外領域の波長のLED素子を組み合わせることにより、更に広い波長範囲で再現性および演色性を高めることが可能である。 As a modification of the fifth embodiment, although not shown, by combining an LED element of a wavelength other different red region or infrared region of wavelength from this the red LED elements (36r), further it is possible to enhance the reproducibility and color rendering properties in a wide wavelength range.
【0039】 [0039]
以上に述べてきた本発明の実施の形態においては、再現性、又は演色性を改善するため、赤色のLED素子又は黄色のLED素子を組み合わせた例につき説明した。 In the embodiment of the present invention has been described above, reproducibility, or to improve the color rendering properties were explained example of combining the red LED element or yellow LED element. しかし、本発明はこれらに限るものではなく、多色発光を含む各種の発光ダイオードにおいて、再現性に欠ける波長領域について、その波長を有するLED素子を組み合わせることにより、演色性、再現性を高めることが本発明に属するものであり、上記組み合わせられるLED素子の波長は、必要に応じ、可視光の領域から赤外の領域までを広く選択することができる。 However, the present invention is not limited to, the various light-emitting diode including a multi-color light emission, the wavelength region lacks reproducibility, by combining an LED element having the wavelength, to enhance color rendering properties, reproducibility There are those belonging to the present invention, the wavelength of the LED elements to be combined above, optionally, can be widely selected from the visible light region to the infrared region.
【0040】 [0040]
【発明の効果】 【Effect of the invention】
以上に説明したように、本発明によれば、白色発光等を目的とした発光ダイオードにおいて、その発光について、▲1▼広い波長波範囲で再現性が高まり、より自然色に近い発光を得ることができるようになる。 As described above, according to the present invention, in a light emitting diode for the purpose of white light emission or the like, for the emission, ▲ 1 ▼ increased reproducibility in a wide wavelength wave range, to obtain light emission closer to natural colors so that it is. ▲2▼更には、必要に応じて赤外領域での再現性を高めることにより、ナイトショットに適した発光ダイオードとすることも可能である。 ▲ 2 ▼ Furthermore, by increasing the reproducibility of the infrared region as needed, it can be a light emitting diode which is suitable for night shot. ▲3▼又、所定領域の波長のLED素子が加えられているので、演色性を保持した状態で、かなり大幅に色調を調整することも可能である。 ▲ 3 ▼ Moreover, since the added is LED elements of the wavelength of the predetermined area, while maintaining the color rendering properties, it is also possible to adjust the color tone quite significantly.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【図1】本発明の第1実施形態に係る発光ダイオードの構成を示す図である。 1 is a diagram showing a structure of a light emitting diode according to a first embodiment of the present invention.
【図2】本発明の第2実施形態に係る発光ダイオードの構成を示す図である。 It is a diagram showing a configuration of a light emitting diode according to a second embodiment of the present invention; FIG.
【図3】本発明の第3実施形態に係る発光ダイオードの構成を示す図である。 3 is a diagram showing a structure of a light emitting diode according to a third embodiment of the present invention.
【図4】本発明の第4実施形態に係るLED素子の高さを揃える方法を示す図である。 Is a diagram illustrating a method of aligning the height of the LED element according to a fourth embodiment of the invention; FIG.
【図5】図1に示す発光ダイオードに関する部分的な発光のスペクトルを示す図である。 5 is a diagram showing the spectrum of partial light emitting a light emitting diode shown in FIG.
【図6】図1に示す発光ダイオードの全体的な発光のスペクトルを示す図である。 6 is a diagram showing the spectrum of the overall light emission of the light emitting diode shown in FIG.
【図7】本発明の第5実施形態に係る発光ダイオードの構成を示す上面図である。 7 is a top view showing a structure of a light emitting diode according to a fifth embodiment of the present invention.
【図8】本発明の第5実施形態に係る発光ダイオードの構成を示す側面図である。 8 is a side view showing a structure of a light emitting diode according to a fifth embodiment of the present invention.
【図9】図7に示す発光ダイオードの発光のスペクトルを示す図である。 9 is a diagram showing the spectrum of light emitted from the light emitting diode shown in FIG.
【図10】従来の白色発光ダイオードの発光のスペクトルを示す図である。 10 is a diagram showing the spectrum of light emitted conventional white light emitting diode.
【符号の説明】 DESCRIPTION OF SYMBOLS
1 基板2 共通電極パターン3 青色用電極パターン4 赤色用電極パターン5、35b 青色LED素子6、36r 赤色LED素子7 Agペースト8 YAG蛍光体9 樹脂基材10 被覆樹脂部材11 凹部12 メタル座布団20、30、40、50 発光ダイオード22b、25b、26r、27g、28y 足ピン32 ステム37g 緑色LED素子38y 黄色LED素子45 モールド 1 substrate 2 common electrode pattern 3 blue electrode pattern 4 red electrode pattern 5,35b blue LED element 6,36r red LED element 7 Ag paste 8 YAG phosphor 9 resin substrate 10 covering the resin member 11 recess 12 metal cushion 20, 30, 40, 50 light-emitting diodes 22b, 25b, 26r, 27g, 28y foot pin 32 stem 37g green LED element 38y yellow LED element 45 mold

Claims (8)

  1. 青色発光ダイオード素子と蛍光体の他に、赤色波長の発光ダイオード素子を備えたことを特徴とする発光ダイオード。 Besides the blue light emitting diode element and the phosphor, the light emitting diode comprising the light emitting diode element of the red wavelength.
  2. 前記赤色波長の発光ダイオード素子のピーク波長は615nm乃至 680nmであ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 of claim 1 peak wavelength of the light emitting diode element of the red wavelength, which is a 615nm to 680 nm.
  3. R、G、Bの3色の発光ダイオード素子の他に、これらの発光ダイオード素子とはピーク波長の異なるY(YG)及び又はR領域又は赤外領域の発光ダイオード素子を備えたことを特徴とする発光ダイオード。 R, G, in addition to the three colors of light-emitting diode device B, a, comprising the light emitting diode elements of different Y (YG) and or R region or infrared region of the peak wavelength and the light-emitting diode element light-emitting diode to be.
  4. 互いに発光色の異なる複数の発光ダイオード素子を有する発光ダイオードにおいて、実効的な発光面の高さを揃えることにより、均一な混色を可能することを特徴とする発光ダイオード。 In the light-emitting diode having a plurality of light emitting diode elements having different emission colors from each other, by aligning the height of the effective light-emitting surface, a light emitting diode, characterized by enabling a uniform color mixing.
  5. 前記発光ダイオードにおいて、発光ダイオード素子を搭載する基板に凹部を設け、該凹部に複数の発光ダイオード素子のうちの少なくとも1つを固定することにより、実効的な発光面の高さを揃えることを特徴とする請求項4に記載の発光ダイオード。 Wherein in said light emitting diode, a concave portion on a substrate for mounting a light emitting diode element is provided, by fixing at least one of the plurality of light emitting diode elements in the recess, that uniform the height of the effective light emitting surface the light emitting diode of claim 4,.
  6. 前記発光ダイオードにおいて、発光ダイオード素子を搭載する基板にスペーサー(メタル座布団)を設け、該スペーサーの上に複数の発光ダイオード素子のうちの少なくとも1つを固定することにより、実効的な発光面の高さを揃えることを特徴とする請求項4に記載の発光ダイオード。 In the light emitting diode, emitting spacers (metal cushion) provided a diode element to the substrate to be mounted, by fixing at least one of the plurality of light emitting diode elements on the said spacer, of the effective emission surface level the light emitting diode of claim 4, wherein the aligning of.
  7. 前記発光ダイオードにおいて、少なくとも1つの発光ダイオード素子の素子ベースの一部を除去することにより、実効的な発光面の高さを揃えることを特徴とする請求項4に記載の発光ダイオード。 In the light emitting diode by removing a part of the element based at least one light-emitting diode, light emitting diode according to claim 4, characterized in that to align the height of the effective light-emitting surface.
  8. 互いに発光色の異なる複数の発光ダイオード素子の、実効的な発光面の高さを揃えることにより、均一な混色を可能することを特徴とする請求項1乃至請求項3のいずれかに記載の発光ダイオード。 A plurality of light emitting diode elements having different emission colors from each other, by aligning the height of the effective light-emitting surface, the light emitting according to any one of claims 1 to 3, characterized in that permit uniform color mixing diode.
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