WO2019054447A1 - White led element in which blue light is reduced, and white led unit in which plurality of said white led elements are arrayed and mounted on wiring substrate - Google Patents

White led element in which blue light is reduced, and white led unit in which plurality of said white led elements are arrayed and mounted on wiring substrate Download PDF

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WO2019054447A1
WO2019054447A1 PCT/JP2018/034001 JP2018034001W WO2019054447A1 WO 2019054447 A1 WO2019054447 A1 WO 2019054447A1 JP 2018034001 W JP2018034001 W JP 2018034001W WO 2019054447 A1 WO2019054447 A1 WO 2019054447A1
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white
white led
led
light emitting
light
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PCT/JP2018/034001
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French (fr)
Japanese (ja)
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水野　昇
憲一 金乙
辰美 塩谷
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株式会社グリーンウェル
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Priority to CN201880006820.8A priority Critical patent/CN110168757A/en
Publication of WO2019054447A1 publication Critical patent/WO2019054447A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements

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  • the present invention is a white LED element with reduced blue light (hereinafter referred to as "blue light") having a wavelength of about 400 nm to 500 nm and a white LED in which a plurality of such white LED elements are arrayed and mounted on a wiring substrate. It is about a unit.
  • LEDs Light emitting diodes
  • LEDs Light emitting diodes
  • a white LED element (hereinafter, also referred to as “conventional white LED element”) in which a blue light emitting LED and a yellow phosphor are combined, as shown in FIG.
  • White light emission is obtained by the light emission from the yellow phosphor 5 that emits light. Since this white LED element obtains white light using only one type of LED element, it is possible to solve the problem of color unevenness that occurs when white light emission is obtained by bringing a plurality of types of LED elements close to each other. However, as shown in FIG. 7, since this white light contains a large amount of blue light with high energy intensity, it tends to cause fatigue and functional deterioration of retinal cells.
  • a film to reduce blue light is attached to the screen of a personal computer, a smart phone, etc.
  • blue light is reduced by color adjustment of the eyeglass lens Measures have been taken, such as adding blue to reduce blue light.
  • Patent Documents 1 to 3 an arbitrary light color (daylight color, daylight white color) is provided by providing a red LED chip to a conventional white LED element and adjusting the emission intensity ratio of the blue LED chip to the red LED chip. White, warm white, light bulb color, etc.) are disclosed.
  • Patent Documents 1 to 3 specifically disclose a white LED element capable of obtaining white light having the brightness, color rendering property, and color temperature required as a lamp for illumination while reducing blue light. Absent.
  • Conventional white LED devices have the advantage of having the highest light emission efficiency among devices that emit white light using LEDs, but have the disadvantage of including many blue lights as described above.
  • it is necessary to interpose members such as a film with a blue light reduction function, a spectacle lens, and a light bulb cover between the white LED element and the user / user. is there.
  • the inventors of the present invention have made intensive studies and studies on improving the above-mentioned disadvantages while making use of the above-mentioned advantages of the conventional white LED element, and have made the present invention.
  • an object of the present invention is to provide a white LED element capable of obtaining white light having brightness, color rendering property and color temperature suitable for a lamp for illumination while reducing blue light, and the white LED element A plurality of white LED units arranged and mounted on a wiring board are provided.
  • the inventors of the present invention provide a red light emitting LED in a white LED element combining a blue light emitting LED and a yellow phosphor, and connect the blue light emitting LED and the red light emitting LED to different power supplies to be supplied to the blue light emitting LED.
  • the ratio of the current to the current supplied to the red light emitting LED is 1: 0.3 to 0.6, the blue light can be reduced, and the brightness and color rendering suitable for the lighting lamp
  • the present invention can provide a white LED element capable of obtaining white light having color and color temperature.
  • the present inventors also found that by arranging and mounting a plurality of such white LED elements on a wiring substrate to make a white LED unit, it can be made a light source suitable for a lamp for illumination.
  • the gist of the present invention is shown below.
  • a blue light emitting LED and a red light emitting LED are disposed on the bottom of the concave portion of the package formed in a concave cross section, and sealed with a transparent resin composition containing a transparent resin, a yellow phosphor and a light diffusing agent White LED elements,
  • the blue light emitting LED and the red light emitting LED are respectively connected to different power supplies;
  • a ratio of a current supplied to the blue light emitting LED to a current supplied to the red light emitting LED is 1: 0.3 to 0.6.
  • a blue light reduced white LED element is 1: 0.3 to 0.6.
  • the white LED element according to (1), wherein the transparent resin of the transparent resin composition is a silicon resin.
  • the white LED element according to (1) or (2), wherein the light diffusing agent of the transparent resin composition is a zinc sulfide compound (ZnS-Ag).
  • the zinc sulfide compound (ZnS-Ag) is Zinc sulfide containing chloride, manganese sulfate as main activator, hafnium chloride, zinc oxide, barium chloride, magnesium chloride, iridium chloride, silver sulfate, gallium oxide, sulfur and chloride After mixing sodium and heating the mixture at 1250 ° C. for 2 hours, the residual flux is removed from the calcined product by washing with water, and after drying, classification grinding is performed to make the particles constant.
  • a red LED is provided to a white LED element combining a blue LED and a yellow phosphor, and the blue LED and the red LED are respectively connected to different power supplies and supplied to the blue LED
  • the ratio of the current to the current supplied to the red light emitting LED is 1: 0.3 to 0.6, the blue light can be reduced, and the brightness and color rendering property suitable for a lamp for illumination White light having a color temperature can be obtained.
  • the white LED element of the present invention compensates the emission spectrum of 600 nm or more which is insufficient in white emission by the conventional white LED element by the red emission LED, and supplies the current supplied to the blue emission LED and the red emission LED By setting the ratio to the supplied current to 1: 0.3 to 0.6, the ratio of blue light contained in white light can be reduced, and good color rendering (Ra color rendering: 85 or more), solar It is possible to obtain natural white light (color temperature: 4000 to 5000 K) close to light.
  • the red light emitting LED is supplied with current from a power supply different from that of the blue light emitting LED, and the current supply to the red light emitting LED with low light emission efficiency supplies the current to the blue light emitting LED with high light emission efficiency Since the red light emitting LED can compensate for the light emission spectrum of 600 nm or more, the red light emitting LED can be used without reducing the brightness (illuminance: 700 lux or more).
  • white light suitable for a lamp for illumination can be obtained.
  • FIG. 6 is a circuit diagram schematically showing a circuit that constitutes a light color variable LED lamp used in Patent Documents 1 to 3.
  • the white LED element of the present invention and the white LED unit in which a plurality of the white LED elements are arrayed and mounted on the wiring substrate will be described in detail with reference to the drawings.
  • FIG. 1 The schematic diagram which shows the light emission principle of the white LED element of this invention is shown in FIG.
  • the blue light emitting LED 3 and the red light emitting LED 4 are disposed on the bottom of the concave portion of the package 2 formed in a concave shape in cross section and transparent resin, yellow phosphor 5 and light diffusing agent 6 It is sealed with the transparent resin composition 7 contained.
  • the white LED element of the present invention may adopt any type of shell type or surface mounting type, but as shown in FIG. 5, a plurality of white LED elements 1 are arrayed and mounted on the wiring substrate 12 to be a white LED When the unit 11 is formed, a surface mounting type is preferable.
  • a blue light emitting LED having a light emitting layer of a gallium nitride compound can be used as the blue light emitting LED 3.
  • red light emitting LED 4 it is possible to use a red light emitting LED having a light emitting layer of an aluminum-indium-gallium-phosphorus system, a gallium-arsenic-phosphorus system, or a gallium-aluminum-arsenic system material.
  • the yellow phosphor 5 is a yellow photoluminescence phosphor that absorbs at least a part of blue light from the blue light emitting LED 3 and converts the wavelength to emit fluorescence, and is europium, manganese activated alkaline earth ortho magnesium orthosilicate phosphor, Europium activated alkaline earth orthosilicate phosphors or europium activated sialon phosphors can be used.
  • the light diffusing agent 6 is a light diffusing substance having a light diffusing function, which is used by being added to a transparent medium of transparent resin, and the difference in refractive index between the transparent resin of the transparent resin composition 7 and the light diffusing agent 6 is large. As the light diffusion effect becomes larger.
  • the light diffusing agent include organic fine particles and inorganic fine particles having a refractive index different from that of the transparent resin.
  • organic fine particles such as melamine resin, CTU guanamine resin and benzoguanamine resin, zinc sulfide compound, titanic acid Inorganic fine particles such as barium, titanium oxide, aluminum oxide and silicon oxide can be used, but as will be described later, the illuminance does not drop sharply even if it is separated from the LED, and from the irradiation direction of the LED It is preferable to use a zinc sulfide compound (ZnS-Ag) which does not cause a sharp drop in illuminance even when angularly shifted.
  • ZnS-Ag zinc sulfide compound
  • a transparent resin of the transparent resin composition 7 use is made of silicon resin, acrylic resin, epoxy resin, fluorine resin or the like which has electrical insulation and transmits light emitted from the blue light emitting LED 3 and the red light emitting LED 4 etc. Can.
  • the white light of the conventional white LED element as shown in FIG. 6 contains many blue lights having high energy intensity as shown in FIG. 7, and the emission spectrum of 600 nm or more is insufficient.
  • good color rendering property Ra color rendering property: 85 or more
  • suitable for lighting lamps and sunlight
  • sunlight A near natural white (color temperature: 4000 to 5000 K) white light can be obtained.
  • the blue light emitting LED 3 and the red light emitting LED 4 are connected to different power supplies.
  • the blue light emitting LED 3 sealed in the recess of the package 2 with the transparent resin composition 7 is connected to one power supply via the wire 10, the lead frame A8, and the lead frame A'8 '
  • the red light emitting LED 4 sealed in the recess of the package 2 with the transparent resin composition 7 is connected to another power supply via the wire 10, the lead frame B9, and the lead frame B'9 '.
  • the ratio of blue light contained in white light can be reduced without lowering the brightness (illuminance: 700 lux or more).
  • the white LED element of the present invention can reduce the ratio of blue light and can obtain brightness, good color rendering and natural white light close to sunlight, which is suitable for a lamp for illumination. Is indicated by a specific numerical value.
  • Table 1 shows the brightness (illuminance: lux) of white light when the current supplied to the red light emitting LED 4 is constant and the current supplied to the blue light emitting LED 3 is changed to change the current ratio supplied to the both.
  • An example of the numerical value of Ra color-rendering property and color temperature (K) is shown.
  • the ratio of the current supplied to the blue light emitting LED 3 to the current supplied to the red light emitting LED 4 is in the range of 1: 0.3 to 0.6. While being able to reduce the ratio of blue light included in white light, ⁇ Without reducing the brightness (illuminance: 700 lux or more), Good color rendering (Ra color rendering: 85 or more) and natural white light close to sunlight (color temperature: 4000 to 5000 K) And white light suitable for a lamp for lighting can be obtained.
  • the resistance values of the light emission intensity adjusting means 21a and 22a are changed to flow to the blue LED chip 21 and the red LED chip 22.
  • any light color daylight color, white color, white color, warm white color, light bulb color, etc.
  • the blue LED chip 21 and the red LED chip 22 Not being connected to different power supplies as in the present invention, it is connected to one and the same power supply.
  • a silicone resin an acrylic resin, an epoxy resin, a fluorocarbon resin or the like can be used, but from the viewpoint of the refractive index, a silicone resin is preferably used.
  • the light diffusing agent 6 is a light diffusing material having a light diffusing function, which is used by being added to a transparent medium of a transparent resin, and a zinc sulfide compound (ZnS-Ag) is used as the light diffusing agent 6
  • ZnS-Ag zinc sulfide compound
  • the light diffusing agent is described in detail in Japanese Patent No. 5710126.
  • zinc sulfide containing chloride, manganese sulfate as a main activator, hafnium chloride, zinc oxide, barium chloride, and Magnesium chloride, iridium chloride, silver sulfate, gallium oxide, sulfur and sodium chloride are mixed, the mixture is heated at 1250 ° C.
  • zinc sulfide, barium chloride, sodium chloride, magnesium chloride, manganese sulfate, gallium and sulfur are added to the particles made constant After heating at 730 ° C for 8 hours and 30 minutes in a nitrogen stream, reclassification and grinding, washing with deionized water, washing with acetic acid and washing again with deionized water Further zinc sulfide compound is activated particles by washing with KCN (ZnS-Ag).
  • the white LED element of the present invention can reduce the proportion of blue light and is suitable for a lamp for illumination, and has suitable brightness, good color rendering and natural white light close to sunlight. It is an excellent thing that can be obtained, but as a light diffusing agent, the illuminance does not drop sharply even if it is separated from the LED, and the illuminance drops rapidly even if it is angularly deviated from the irradiation direction of the LED.
  • ZnS-Ag zinc sulfide compound having the characteristic of having nothing as a light diffusing agent
  • any type of shell type or surface mounting type can be adopted, but as shown in FIG. 5, a plurality of white LED elements 1 on the wiring substrate 12 When the white LED units 11 are formed by arraying and mounting, a surface mounting type is preferable.
  • the electricity supplied from the electric wire A13 to the white LED unit 11 passes through the white LED element 1 in the upper right along a route of lead frame A8 ⁇ wire 10 ⁇ blue light emitting LED3 ⁇ wire 10 ⁇ lead frame A′8 ′. Similarly, after flowing in the next white LED element 1 one after another, the electric current flows from the electric wire A ′ 13 ′ to the outside of the white LED unit 11.
  • the electricity supplied from the electric wire B14 to the white LED unit 11 flows in the upper right white LED element 1 in the route of lead frame B9 ⁇ wire 10 ⁇ red light emitting LED 4 ⁇ wire 10 ⁇ lead frame B'9 ' After flowing through the next white LED element 1 one after another, the electric wire B ′ 14 ′ flows out of the white LED unit 11.
  • white light suitable for a lamp for illumination can be obtained by arranging and mounting a plurality of the white LED elements of the present invention on the wiring substrate to form the white LED unit 11.
  • the number, arrangement, and the like of the white LED elements 1 provided in the white LED unit can be appropriately designed according to the required illumination intensity and shape (lamp shape, fluorescent lamp shape) of the light source.
  • the red LED is provided on the white LED element combining the blue light emitting LED and the yellow phosphor, and the blue light emitting LED and the red light emitting LED are connected to different power supplies.
  • Blue light can be reduced by setting the ratio of the current supplied to the blue light emitting LED to the current supplied to the red light emitting LED at 1: 0.3 to 0.6, and a lamp for lighting It is excellent for obtaining white light with suitable brightness, color rendering and color temperature.
  • white light suitable for a lamp for illumination can be obtained.

Abstract

The present invention addresses the problem of providing a white LED element by which there is obtained white light having a brightness, color rendering property, and a color temperature that are suited to an illumination lamp while blue light is reduced, and also addresses the problem of providing a white LED unit in which a plurality of said white LED elements are arrayed and mounted on a wiring substrate. A red-light-emitting LED is provided to a white LED element obtained by combining a blue-light-emitting LED and a yellow phosphor, the blue-light-emitting LED and the red-light-emitting LED are connected to respectively separate power sources, and the ratio of the current supplied to the blue-light-emitting LED and the current supplied to the red-light-emitting LED is 1:0.3-0.6. It is thereby possible to provide a white LED element in which blue light is reduced and by which there is obtained white light having a brightness, color rendering property, and a color temperature that are suited to an illumination lamp. Furthermore, arraying and mounting a plurality of these white LED elements on a wiring substrate to obtain a white LED unit makes it possible to obtain a light source that is suited to an illumination lamp.

Description

ブルーライトを低減した白色ＬＥＤ素子および該白色ＬＥＤ素子を複数個、配線基板上に配列・搭載した白色ＬＥＤユニットWhite LED elements with reduced blue light and white LED units having a plurality of the white LED elements arranged and mounted on a wiring board
　本発明は、波長がほぼ４００ｎｍ～５００ｎｍの範囲の青色光（以下、「ブルーライト」という。）を低減した白色ＬＥＤ素子および該白色ＬＥＤ素子を複数個、配線基板上に配列・搭載した白色ＬＥＤユニットに関する。 The present invention is a white LED element with reduced blue light (hereinafter referred to as "blue light") having a wavelength of about 400 nm to 500 nm and a white LED in which a plurality of such white LED elements are arrayed and mounted on a wiring substrate. It is about a unit.
　発光ダイオード（以下、「ＬＥＤ」という。）は、小型で効率が良く鮮やかな色の発光を示し、優れた単色性ピークを有している。ＬＥＤを用いて白色発光させる場合、例えば赤色発光ＬＥＤ、緑色発光ＬＥＤおよび青色発光ＬＥＤを近接して配置させて拡散混色を行わせる必要があるが、各ＬＥＤが優れた単色性ピークを有するため色むらが生じやすい。すなわち、各ＬＥＤからの発光が不均一で混色がうまくいかないと、色むらが生じた白色発光となってしまう。このような色むらの問題を解消するために、青色発光ＬＥＤと黄色蛍光体とを組み合わせて白色発光を得る技術が開発された。 Light emitting diodes (hereinafter referred to as "LEDs") are compact, efficient, exhibit bright color emission, and have excellent monochromatic peaks. In the case of emitting white light by using LEDs, for example, it is necessary to arrange red light emitting LED, green light emitting LED and blue light emitting LED close to each other to perform diffusion color mixing, but each LED has excellent monochromatic peak. Unevenness is likely to occur. That is, if the light emission from each LED is uneven and color mixing is not successful, white light emission with uneven color will result. In order to solve the problem of such uneven color, a technology for obtaining white light emission by combining a blue light emitting LED and a yellow phosphor has been developed.
　青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子（以下、「従来の白色ＬＥＤ素子」ともいう。）では、図６に示すように、青色発光ＬＥＤ３からの発光と、その発光で励起され黄色を発光する黄色蛍光体５からの発光とによって白色発光を得ている。この白色ＬＥＤ素子は、１種類のＬＥＤ素子だけを用いて白色光を得るため、複数種類のＬＥＤ素子を近接させて白色発光を得る場合に生じる色むらの問題を解消することができる。しかしながら、この白色光は、図７に示すように、エネルギー強度の大きいブルーライトを多く含むことから、網膜細胞の疲労・機能低下を引き起こしやすい。 In a white LED element (hereinafter, also referred to as “conventional white LED element”) in which a blue light emitting LED and a yellow phosphor are combined, as shown in FIG. White light emission is obtained by the light emission from the yellow phosphor 5 that emits light. Since this white LED element obtains white light using only one type of LED element, it is possible to solve the problem of color unevenness that occurs when white light emission is obtained by bringing a plurality of types of LED elements close to each other. However, as shown in FIG. 7, since this white light contains a large amount of blue light with high energy intensity, it tends to cause fatigue and functional deterioration of retinal cells.
　このような白色ＬＥＤ素子のブルーライト対策として、ブルーライトを低減するフィルムをパソコン、スマートフォンなどの画面に貼着する、眼鏡レンズの色調整によりブルーライトを低減する、ＬＥＤ電球のカバー素材に特殊塗料を添加してブルーライトを低減するなどの対策が採られている。 As a measure against blue light of such white LED elements, a film to reduce blue light is attached to the screen of a personal computer, a smart phone, etc., blue light is reduced by color adjustment of the eyeglass lens Measures have been taken, such as adding blue to reduce blue light.
　また、特許文献１～３には、従来の白色ＬＥＤ素子に赤色ＬＥＤチップを設けて、青色ＬＥＤチップと赤色ＬＥＤチップとの発光強度比を調整することにより、任意の光色（昼光色、昼白色、白色、温白色、電球色など）を発光させることができる白色ＬＥＤ素子が開示されている。しかしながら、特許文献１～３では、ブルーライトを低減しつつ、照明用ランプとして必要とされる明るさ、演色性、色温度を有する白色光が得られる白色ＬＥＤ素子については具体的に開示されていない。 Further, in Patent Documents 1 to 3, an arbitrary light color (daylight color, daylight white color) is provided by providing a red LED chip to a conventional white LED element and adjusting the emission intensity ratio of the blue LED chip to the red LED chip. White, warm white, light bulb color, etc.) are disclosed. However, Patent Documents 1 to 3 specifically disclose a white LED element capable of obtaining white light having the brightness, color rendering property, and color temperature required as a lamp for illumination while reducing blue light. Absent.
特開２００２－０５７３７６号公報Japanese Patent Application Publication No. 2002-057376 特開２００４－０８００４６号公報JP 2004-080046 A 特開２００７－２１４６０３号公報JP 2007-214603 A
　従来の白色ＬＥＤ素子は、ＬＥＤを用いて白色を発光させる素子のなかで一番発光効率が高いという長所を有しているものの、上記のようにブルーライトを多く含むという短所を有しており、ブルーライトが網膜に及ぼす悪影響を防止するためには、白色ＬＥＤ素子と使用者・利用者との間に、ブルーライト低減機能を有するフィルム、眼鏡レンズ、電球カバーなどの部材を介在させる必要がある。 Conventional white LED devices have the advantage of having the highest light emission efficiency among devices that emit white light using LEDs, but have the disadvantage of including many blue lights as described above. In order to prevent the adverse effect of blue light on the retina, it is necessary to interpose members such as a film with a blue light reduction function, a spectacle lens, and a light bulb cover between the white LED element and the user / user. is there.
　本発明者等は、従来の白色ＬＥＤ素子の上記のような長所を生かしつつ、上記のような短所を改善することについて鋭意研究・検討を重ね、本発明を成したものである。 The inventors of the present invention have made intensive studies and studies on improving the above-mentioned disadvantages while making use of the above-mentioned advantages of the conventional white LED element, and have made the present invention.
　すなわち、本発明の課題は、ブルーライトを低減しつつ、照明用ランプに適した明るさ、演色性、色温度を有する白色光が得られる白色ＬＥＤ素子を提供すること、および該白色ＬＥＤ素子を複数個、配線基板上に配列・搭載した白色ＬＥＤユニットを提供することにある。 That is, an object of the present invention is to provide a white LED element capable of obtaining white light having brightness, color rendering property and color temperature suitable for a lamp for illumination while reducing blue light, and the white LED element A plurality of white LED units arranged and mounted on a wiring board are provided.
　本発明者等は、青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子に赤色発光ＬＥＤを設けると共に、青色発光ＬＥＤおよび赤色発光ＬＥＤをそれぞれ別の電源に接続し、青色発光ＬＥＤに供給される電流と、赤色発光ＬＥＤに供給される電流との比を、１：０．３～０．６とすることにより、ブルーライトを低減することができると共に、照明用ランプに適した明るさ、演色性、色温度を有する白色光が得られる白色ＬＥＤ素子を提供できることを見出し、本発明を成したものである。さらに、本発明者等は、この白色ＬＥＤ素子を複数個、配線基板上に配列・搭載して白色ＬＥＤユニットとすることにより、照明用ランプに適した光源とできることも見出した。 The inventors of the present invention provide a red light emitting LED in a white LED element combining a blue light emitting LED and a yellow phosphor, and connect the blue light emitting LED and the red light emitting LED to different power supplies to be supplied to the blue light emitting LED. By setting the ratio of the current to the current supplied to the red light emitting LED at 1: 0.3 to 0.6, the blue light can be reduced, and the brightness and color rendering suitable for the lighting lamp It is found that the present invention can provide a white LED element capable of obtaining white light having color and color temperature. Furthermore, the present inventors also found that by arranging and mounting a plurality of such white LED elements on a wiring substrate to make a white LED unit, it can be made a light source suitable for a lamp for illumination.
　本発明の要旨を以下に示す。
（１）断面凹字型に形成されたパッケージの凹部の底面に、青色発光ＬＥＤおよび赤色発光ＬＥＤを配置し、透明樹脂、黄色蛍光体及び光拡散剤を含有する透明樹脂組成物で封止してなる白色ＬＥＤ素子であって、
　前記青色発光ＬＥＤおよび前記赤色発光ＬＥＤがそれぞれ別の電源に接続され、
　前記青色発光ＬＥＤに供給される電流と、前記赤色発光ＬＥＤに供給される電流との比を、１：０．３～０．６とすることを特徴とする、ブルーライトを低減した白色ＬＥＤ素子。
（２）前記透明樹脂組成物の透明樹脂がシリコン樹脂であることを特徴とする、（１）に記載の白色ＬＥＤ素子。
（３）前記透明樹脂組成物の光拡散剤が硫化亜鉛化合物（ＺｎＳ－Ａｇ）であることを特徴とする、（１）または（２）に記載の白色ＬＥＤ素子。
（４）前記硫化亜鉛化合物（ＺｎＳ－Ａｇ）が、
　塩化物を含む硫化亜鉛と、主要な活性剤としての硫酸マンガンと、塩化ハフニウムと、酸化亜鉛と、塩化バリウムと、塩化マグネシウムと、塩化イリジウムと、硫酸銀と、酸化ガリウムと、硫黄と、塩化ナトリウムと、を混合して、当該混合物を１２５０℃で２時間加熱した後、焼成物から残留フラックスを水洗により除去して、乾燥後、分級粉砕して粒子を一定にし、
　当該一定にした粒子に、硫化亜鉛と、塩化バリウムと、塩化ナトリウムと、塩化マグネシウムと、硫酸マンガンと、ガリウムと、硫黄と、を加えて、窒素気流中７３０℃で８時間３０分熱した後再度分級粉砕し、脱イオン水で洗浄した後、酢酸で洗浄して、再度脱イオン水で洗浄した後、さらにＫＣＮで洗浄することで活性化した粒子
であることを特徴とする、（３）に記載の白色ＬＥＤ素子。
（５）前記白色ＬＥＤ素子が表面実装型であることを特徴とする、（１）～（４）のいずれかに記載の白色ＬＥＤ素子。
（６）（５）に記載の白色ＬＥＤ素子を、複数個、配線基板上に配列・搭載した白色ＬＥＤユニット。 The gist of the present invention is shown below.
(1) A blue light emitting LED and a red light emitting LED are disposed on the bottom of the concave portion of the package formed in a concave cross section, and sealed with a transparent resin composition containing a transparent resin, a yellow phosphor and a light diffusing agent White LED elements,
The blue light emitting LED and the red light emitting LED are respectively connected to different power supplies;
A ratio of a current supplied to the blue light emitting LED to a current supplied to the red light emitting LED is 1: 0.3 to 0.6. A blue light reduced white LED element .
(2) The white LED element according to (1), wherein the transparent resin of the transparent resin composition is a silicon resin.
(3) The white LED element according to (1) or (2), wherein the light diffusing agent of the transparent resin composition is a zinc sulfide compound (ZnS-Ag).
(4) The zinc sulfide compound (ZnS-Ag) is
Zinc sulfide containing chloride, manganese sulfate as main activator, hafnium chloride, zinc oxide, barium chloride, magnesium chloride, iridium chloride, silver sulfate, gallium oxide, sulfur and chloride After mixing sodium and heating the mixture at 1250 ° C. for 2 hours, the residual flux is removed from the calcined product by washing with water, and after drying, classification grinding is performed to make the particles constant.
After adding zinc sulfide, barium chloride, sodium chloride, magnesium chloride, manganese sulfate, gallium and sulfur to the fixed particles and heating in a nitrogen stream at 730 ° C. for 8 hours and 30 minutes Classification and grinding again, washing with deionized water, washing with acetic acid, washing again with deionized water and further washing with KCN are characterized in that the particles are activated by washing, (3) The white LED element as described in.
(5) The white LED element according to any one of (1) to (4), wherein the white LED element is a surface mounting type.
(6) A white LED unit in which a plurality of the white LED elements described in (5) are arrayed and mounted on a wiring board.
　本発明の白色ＬＥＤ素子は、青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子に赤色発光ＬＥＤを設けると共に、青色発光ＬＥＤおよび赤色発光ＬＥＤをそれぞれ別の電源に接続し、青色発光ＬＥＤに供給される電流と、赤色発光ＬＥＤに供給される電流との比を、１：０．３～０．６とすることにより、ブルーライトを低減できると共に、照明用ランプに適した明るさ、演色性、色温度を有する白色光を得ることができる。 In the white LED element of the present invention, a red LED is provided to a white LED element combining a blue LED and a yellow phosphor, and the blue LED and the red LED are respectively connected to different power supplies and supplied to the blue LED By setting the ratio of the current to the current supplied to the red light emitting LED to 1: 0.3 to 0.6, the blue light can be reduced, and the brightness and color rendering property suitable for a lamp for illumination White light having a color temperature can be obtained.
　すなわち、本発明の白色ＬＥＤ素子は、従来の白色ＬＥＤ素子による白色発光において不足していた６００ｎｍ以上の発光スペクトルを赤色発光ＬＥＤにより補うようにし、青色発光ＬＥＤに供給される電流と赤色発光ＬＥＤに供給される電流との比を１：０．３～０．６とすることにより、白色光に含まれるブルーライトの比率を低減できると共に、良好な演色性（Ｒａ演色性：８５以上）、太陽光に近い自然な白色（色温度：４０００～５０００Ｋ）の白色光を得ることができる。さらに、赤色発光ＬＥＤには、青色発光ＬＥＤの電源とは別の電源から電流を供給するようにし、発光効率の低い赤色発光ＬＥＤへの電流供給によって発光効率の高い青色発光ＬＥＤへの電流供給量が低下しないようにしたため、明るさを低下させることなく（照度：７００ルクス以上）、赤色発光ＬＥＤにより、白色光に６００ｎｍ以上の発光スペクトルを補うことができる。 That is, the white LED element of the present invention compensates the emission spectrum of 600 nm or more which is insufficient in white emission by the conventional white LED element by the red emission LED, and supplies the current supplied to the blue emission LED and the red emission LED By setting the ratio to the supplied current to 1: 0.3 to 0.6, the ratio of blue light contained in white light can be reduced, and good color rendering (Ra color rendering: 85 or more), solar It is possible to obtain natural white light (color temperature: 4000 to 5000 K) close to light. Furthermore, the red light emitting LED is supplied with current from a power supply different from that of the blue light emitting LED, and the current supply to the red light emitting LED with low light emission efficiency supplies the current to the blue light emitting LED with high light emission efficiency Since the red light emitting LED can compensate for the light emission spectrum of 600 nm or more, the red light emitting LED can be used without reducing the brightness (illuminance: 700 lux or more).
　また、この白色ＬＥＤ素子を複数個、配線基板上に配列・搭載して白色ＬＥＤユニットとすることにより、照明用ランプに適した白色光を得ることができる。 Further, by arranging and mounting a plurality of the white LED elements on the wiring substrate to form a white LED unit, white light suitable for a lamp for illumination can be obtained.
本発明の白色ＬＥＤ素子の発光原理を示す模式図である。It is a schematic diagram which shows the light emission principle of the white LED element of this invention. 本発明の白色ＬＥＤ素子の一実施形態を示す外観斜視図である。It is an appearance perspective view showing one embodiment of a white LED element of the present invention. 本発明の白色ＬＥＤ素子の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the white LED element of this invention. 本発明の白色ＬＥＤ素子の発光スペクトルである。It is an emission spectrum of the white LED element of this invention. 本発明の白色ＬＥＤ素子を複数個、配線基板上に配列・搭載した白色ＬＥＤユニットを示す外観斜視図である。It is an appearance perspective view showing a white LED unit which arranged and carried a plurality of white LED elements of the present invention on a wiring board. 従来の青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子の発光原理を示す模式図である。It is a schematic diagram which shows the light emission principle of the white LED element which combined the conventional blue light emission LED and yellow fluorescent substance. 従来の青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子の発光スペクトルである。It is an emission spectrum of the white LED element which combined the conventional blue light emission LED and yellow fluorescent substance. 特許文献１～３において用いられる光色可変ＬＥＤランプを構成する回路を模式的に示す回路図である。FIG. 6 is a circuit diagram schematically showing a circuit that constitutes a light color variable LED lamp used in Patent Documents 1 to 3.
　以下、本発明の白色ＬＥＤ素子およびこの白色ＬＥＤ素子を複数個、配線基板上に配列・搭載した白色ＬＥＤユニットについて、図面も用いながら詳細に説明する。 Hereinafter, the white LED element of the present invention and the white LED unit in which a plurality of the white LED elements are arrayed and mounted on the wiring substrate will be described in detail with reference to the drawings.
　本発明の白色ＬＥＤ素子の発光原理を示す模式図を図１に示す。 The schematic diagram which shows the light emission principle of the white LED element of this invention is shown in FIG.
　本発明の白色ＬＥＤ素子１では、断面凹字型に形成された、パッケージ２の凹部の底面に、青色発光ＬＥＤ３および赤色発光ＬＥＤ４が配置され、透明樹脂、黄色蛍光体５及び光拡散剤６を含有する透明樹脂組成物７で封止されている。 In the white LED element 1 of the present invention, the blue light emitting LED 3 and the red light emitting LED 4 are disposed on the bottom of the concave portion of the package 2 formed in a concave shape in cross section and transparent resin, yellow phosphor 5 and light diffusing agent 6 It is sealed with the transparent resin composition 7 contained.
　パッケージ２の材料としては、ポリカーボネート樹脂、ポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）、ＡＢＳ樹脂、エポキシ樹脂、フェノール樹脂、アクリル樹脂、ＰＢＴ樹脂などの樹脂やセラミックなどを用いることができる。本発明の白色ＬＥＤ素子は、砲弾型、表面実装型のいずれのタイプも採用できるが、図５に示すように、白色ＬＥＤ素子１を複数個、配線基板１２上に配列・搭載して白色ＬＥＤユニット１１を形成する場合には、表面実装型が好ましい。 As a material of the package 2, resins such as polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, epoxy resin, phenol resin, acrylic resin, PBT resin, and ceramic can be used. The white LED element of the present invention may adopt any type of shell type or surface mounting type, but as shown in FIG. 5, a plurality of white LED elements 1 are arrayed and mounted on the wiring substrate 12 to be a white LED When the unit 11 is formed, a surface mounting type is preferable.
　青色発光ＬＥＤ３としては、窒化ガリウム系化合物の発光層を有する青色発光ＬＥＤなどを用いることができる。 A blue light emitting LED having a light emitting layer of a gallium nitride compound can be used as the blue light emitting LED 3.
　赤色発光ＬＥＤ４としては、アルミニウム・インジウム・ガリウム・リン系、ガリウム・ヒ素・リン系、または、ガリウム・アルミニウム・ヒ素系材料の発光層を有する赤色発光ＬＥＤなどを用いることができる。 As the red light emitting LED 4, it is possible to use a red light emitting LED having a light emitting layer of an aluminum-indium-gallium-phosphorus system, a gallium-arsenic-phosphorus system, or a gallium-aluminum-arsenic system material.
　黄色蛍光体５は、青色発光ＬＥＤ３からの青色光の少なくとも一部を吸収し波長変換して蛍光を発する黄色のフォトルミネッセンス蛍光体であり、ユーロピウム、マンガン付活アルカリ土類オルト珪酸マグネシウム蛍光体、ユーロピウム付活アルカリ土類オルト珪酸塩蛍光体またはユーロピウム付活サイアロン蛍光体などを用いることができる。 The yellow phosphor 5 is a yellow photoluminescence phosphor that absorbs at least a part of blue light from the blue light emitting LED 3 and converts the wavelength to emit fluorescence, and is europium, manganese activated alkaline earth ortho magnesium orthosilicate phosphor, Europium activated alkaline earth orthosilicate phosphors or europium activated sialon phosphors can be used.
　光拡散剤６は、透明樹脂の透明媒体に添加して用いられる、光拡散機能を有する光拡散物質であり、透明樹脂組成物７の透明樹脂と光拡散剤６との屈折率の差が大きいほど光拡散効果が大きくなる。光拡散剤としては、透明樹脂と屈折率の異なる有機系微粒子や無機系微粒子が挙げられ、具体的には、メラミン樹脂、ＣＴＵグアナミン樹脂、ベンゾグアナミン樹脂などの有機系微粒子、硫化亜鉛化合物、チタン酸バリウム、酸化チタン、酸化アルミニウム、酸化珪素などの無機系微粒子を用いることができるが、後で説明するように、ＬＥＤから離れても照度が急激に落ちてしまうことがなく、ＬＥＤの照射方向から角度的にずれても照度が急激に落ちてしまうことのない硫化亜鉛化合物（ＺｎＳ－Ａｇ）を用いるのが好ましい。 The light diffusing agent 6 is a light diffusing substance having a light diffusing function, which is used by being added to a transparent medium of transparent resin, and the difference in refractive index between the transparent resin of the transparent resin composition 7 and the light diffusing agent 6 is large. As the light diffusion effect becomes larger. Examples of the light diffusing agent include organic fine particles and inorganic fine particles having a refractive index different from that of the transparent resin. Specifically, organic fine particles such as melamine resin, CTU guanamine resin and benzoguanamine resin, zinc sulfide compound, titanic acid Inorganic fine particles such as barium, titanium oxide, aluminum oxide and silicon oxide can be used, but as will be described later, the illuminance does not drop sharply even if it is separated from the LED, and from the irradiation direction of the LED It is preferable to use a zinc sulfide compound (ZnS-Ag) which does not cause a sharp drop in illuminance even when angularly shifted.
　透明樹脂組成物７の透明樹脂としては、電気的絶縁性を有し、青色発光ＬＥＤ３、赤色発光ＬＥＤ４などから発せられる光を透過する、シリコン樹脂、アクリル樹脂、エポキシ樹脂、フッ素樹脂などを用いることができる。 As a transparent resin of the transparent resin composition 7, use is made of silicon resin, acrylic resin, epoxy resin, fluorine resin or the like which has electrical insulation and transmits light emitted from the blue light emitting LED 3 and the red light emitting LED 4 etc. Can.
　図６に示すような従来の白色ＬＥＤ素子の白色光は、図７に示すように、エネルギー強度の大きいブルーライトを多く含むと共に、６００ｎｍ以上の発光スペクトルが不足するが、本発明の白色ＬＥＤ素子１では、この不足している６００ｎｍ以上の発光スペクトルを赤色発光ＬＥＤにより補うことにより、図４に示すように、白色光に含まれるブルーライトの比率を低減できると共に、青色発光ＬＥＤに供給される電流と赤色発光ＬＥＤに供給される電流との比を１：０．３～０．６とすることにより、照明用ランプに適した良好な演色性（Ｒａ演色性：８５以上）、太陽光に近い自然な白色（色温度：４０００～５０００Ｋ）の白色光を得ることができる。 The white light of the conventional white LED element as shown in FIG. 6 contains many blue lights having high energy intensity as shown in FIG. 7, and the emission spectrum of 600 nm or more is insufficient. In 1, it is possible to reduce the ratio of blue light contained in white light as shown in FIG. 4 by supplementing this insufficient emission spectrum of 600 nm or more with a red light emitting LED, and to be supplied to a blue light emitting LED By setting the ratio between the current and the current supplied to the red light emitting LED to 1: 0.3 to 0.6, good color rendering property (Ra color rendering property: 85 or more) suitable for lighting lamps, and sunlight A near natural white (color temperature: 4000 to 5000 K) white light can be obtained.
　さらに、図２および図３に示すように、本発明の白色ＬＥＤ素子１では、青色発光ＬＥＤ３および赤色発光ＬＥＤ４がそれぞれ別の電源に接続されている。具体的には、パッケージ２の凹部に透明樹脂組成物７で封止された青色発光ＬＥＤ３は、ワイヤー１０、リードフレームＡ８、リードフレームＡ’８’を介して一つの電源に接続されており、また、パッケージ２の凹部に透明樹脂組成物７で封止された赤色発光ＬＥＤ４は、ワイヤー１０、リードフレームＢ９、リードフレームＢ’９’を介して他の電源に接続されている。 Furthermore, as shown in FIG. 2 and FIG. 3, in the white LED element 1 of the present invention, the blue light emitting LED 3 and the red light emitting LED 4 are connected to different power supplies. Specifically, the blue light emitting LED 3 sealed in the recess of the package 2 with the transparent resin composition 7 is connected to one power supply via the wire 10, the lead frame A8, and the lead frame A'8 ', The red light emitting LED 4 sealed in the recess of the package 2 with the transparent resin composition 7 is connected to another power supply via the wire 10, the lead frame B9, and the lead frame B'9 '.
　このように、青色発光ＬＥＤ３および赤色発光ＬＥＤ４をそれぞれ別の電源に接続することにより、発光効率の低い赤色発光ＬＥＤへの電流供給により発光効率の高い青色発光ＬＥＤへの電流供給量が低下しないようにしたため、明るさを低下させることなく（照度：７００ルクス以上）、図４に示すように、白色光に含まれるブルーライトの比率を低減することができる。 Thus, by connecting the blue light emitting LED 3 and the red light emitting LED 4 to different power supplies, the current supply to the red light emitting LED with low light emission efficiency is prevented from decreasing the current supply to the blue light emitting LED with high light emission efficiency As a result, as shown in FIG. 4, the ratio of blue light contained in white light can be reduced without lowering the brightness (illuminance: 700 lux or more).
　本発明の白色ＬＥＤ素子は、ブルーライトの比率を低減できると共に、照明用ランプに適した、明るさ、良好な演色性および太陽光に近い自然な白色の白色光を得ることができるが、これを具体的な数値で示す。表１に、赤色発光ＬＥＤ４への供給電流を一定値とし青色発光ＬＥＤ３への供給電流を変更して両者に供給する電流比を変化させた場合の、白色光の明るさ（照度：ルクス）、Ｒａ演色性および色温度（Ｋ）の数値の一例を示す。 The white LED element of the present invention can reduce the ratio of blue light and can obtain brightness, good color rendering and natural white light close to sunlight, which is suitable for a lamp for illumination. Is indicated by a specific numerical value. Table 1 shows the brightness (illuminance: lux) of white light when the current supplied to the red light emitting LED 4 is constant and the current supplied to the blue light emitting LED 3 is changed to change the current ratio supplied to the both. An example of the numerical value of Ra color-rendering property and color temperature (K) is shown.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　上記表１からわかるように、本発明の白色ＬＥＤ素子は、青色発光ＬＥＤ３に供給される電流と、赤色発光ＬＥＤ４に供給される電流との比を、１：０．３～０．６の範囲とすることにより、白色光に含まれるブルーライトの比率を低減できると共に、
〇明るさを低下させることなく（照度：７００ルクス以上）、
〇良好な演色性（Ｒａ演色性：８５以上）および
〇太陽光に近い自然な白色（色温度：４０００～５０００Ｋ）
を有する、照明用ランプに適した白色光を得ることができる。 As can be seen from Table 1 above, in the white LED element of the present invention, the ratio of the current supplied to the blue light emitting LED 3 to the current supplied to the red light emitting LED 4 is in the range of 1: 0.3 to 0.6. While being able to reduce the ratio of blue light included in white light,
○ Without reducing the brightness (illuminance: 700 lux or more),
Good color rendering (Ra color rendering: 85 or more) and natural white light close to sunlight (color temperature: 4000 to 5000 K)
And white light suitable for a lamp for lighting can be obtained.
　一方、特許文献１～３に記載された白色ＬＥＤ素子は、図８に示すような回路２０において、発光強度調整手段２１ａ、２２ａの抵抗値を変え、青色ＬＥＤチップ２１および赤色ＬＥＤチップ２２に流れる電流比を調整し発光強度比を調整することにより、任意の光色（昼光色、昼白色、白色、温白色、電球色など）を得るものであるが、青色ＬＥＤチップ２１と赤色ＬＥＤチップ２２は、本件発明のようにそれぞれ別の電源に接続されているのではなく、一つの同じ電源に接続されている。 On the other hand, in the white LED elements described in Patent Documents 1 to 3, in the circuit 20 as shown in FIG. 8, the resistance values of the light emission intensity adjusting means 21a and 22a are changed to flow to the blue LED chip 21 and the red LED chip 22. By adjusting the current ratio and adjusting the light emission intensity ratio, any light color (daylight color, white color, white color, warm white color, light bulb color, etc.) can be obtained, but the blue LED chip 21 and the red LED chip 22 Not being connected to different power supplies as in the present invention, it is connected to one and the same power supply.
　このため、特許文献１～３に記載された白色ＬＥＤ素子では、発光効率の低い赤色ＬＥＤチップ２２に流れる電流量を増加させると、発光効率の高い青色ＬＥＤチップ２１に流れる電流量が減少し、白色光の明るさ（照度）が低下してしまうため、照明用の光源とするには適さないものである。 For this reason, in the white LED elements described in Patent Documents 1 to 3, when the amount of current flowing to the red LED chip 22 with low luminous efficiency is increased, the amount of current flowing to the blue LED chip 21 with high luminous efficiency decreases. Since the brightness (illuminance) of white light decreases, it is not suitable as a light source for illumination.
　透明樹脂組成物７の透明樹脂としては、前記のように、シリコン樹脂、アクリル樹脂、エポキシ樹脂、フッ素樹脂などを用いることができるが、屈折率の観点からは、シリコン樹脂を用いるのが好ましい。 As the transparent resin of the transparent resin composition 7, as described above, a silicone resin, an acrylic resin, an epoxy resin, a fluorocarbon resin or the like can be used, but from the viewpoint of the refractive index, a silicone resin is preferably used.
　先に説明したように、光拡散剤６は、透明樹脂の透明媒体に添加して用いられる、光拡散機能を有する光拡散物質であり、光拡散剤６として硫化亜鉛化合物（ＺｎＳ－Ａｇ）を用いると、ＬＥＤから離れても照度が急激に落ちてしまうことがなく、ＬＥＤの照射方向から角度的にずれても照度が急激に落ちてしまうことのないため好ましい。 As described above, the light diffusing agent 6 is a light diffusing material having a light diffusing function, which is used by being added to a transparent medium of a transparent resin, and a zinc sulfide compound (ZnS-Ag) is used as the light diffusing agent 6 When used, it is preferable because the illuminance does not drop rapidly even if it is separated from the LED, and the illuminance does not drop rapidly even if it is angularly deviated from the irradiation direction of the LED.
　この光拡散剤については、特許第５７１０１２６号公報に詳しく記載されているが、塩化物を含む硫化亜鉛と、主要な活性剤としての硫酸マンガンと、塩化ハフニウムと、酸化亜鉛と、塩化バリウムと、塩化マグネシウムと、塩化イリジウムと、硫酸銀と、酸化ガリウムと、硫黄と、塩化ナトリウムと、を混合して、当該混合物を１２５０℃で２時間加熱した後、焼成物から残留フラックスを水洗により除去して、乾燥後、分級粉砕して粒子を一定にし、当該一定にした粒子に、硫化亜鉛と、塩化バリウムと、塩化ナトリウムと、塩化マグネシウムと、硫酸マンガンと、ガリウムと、硫黄と、を加えて、窒素気流中７３０℃で８時間３０分熱した後再度分級粉砕し、脱イオン水で洗浄した後、酢酸で洗浄して、再度脱イオン水で洗浄した後、さらにＫＣＮで洗浄することで活性化した粒子である硫化亜鉛化合物（ＺｎＳ－Ａｇ）である。 The light diffusing agent is described in detail in Japanese Patent No. 5710126. However, zinc sulfide containing chloride, manganese sulfate as a main activator, hafnium chloride, zinc oxide, barium chloride, and Magnesium chloride, iridium chloride, silver sulfate, gallium oxide, sulfur and sodium chloride are mixed, the mixture is heated at 1250 ° C. for 2 hours, and the residual flux is removed from the fired product by water washing After drying, classification and grinding to make the particles constant, zinc sulfide, barium chloride, sodium chloride, magnesium chloride, manganese sulfate, gallium and sulfur are added to the particles made constant After heating at 730 ° C for 8 hours and 30 minutes in a nitrogen stream, reclassification and grinding, washing with deionized water, washing with acetic acid and washing again with deionized water Further zinc sulfide compound is activated particles by washing with KCN (ZnS-Ag).
　本発明の白色ＬＥＤ素子は、先に説明したように、ブルーライトの比率を低減できると共に、照明用ランプに適した、明るさ、良好な演色性および太陽光に近い自然な白色の白色光を得ることができる優れたものであるが、光拡散剤として、ＬＥＤから離れても照度が急激に落ちてしまうことがなく、ＬＥＤの照射方向から角度的にずれても照度が急激に落ちてしまうことのないとの特性を有する硫化亜鉛化合物（ＺｎＳ－Ａｇ）を光拡散剤として使用することにより、照明用ランプ用の光源としてより一層優れたものとすることができる。 As described above, the white LED element of the present invention can reduce the proportion of blue light and is suitable for a lamp for illumination, and has suitable brightness, good color rendering and natural white light close to sunlight. It is an excellent thing that can be obtained, but as a light diffusing agent, the illuminance does not drop sharply even if it is separated from the LED, and the illuminance drops rapidly even if it is angularly deviated from the irradiation direction of the LED By using a zinc sulfide compound (ZnS-Ag) having the characteristic of having nothing as a light diffusing agent, the light source can be made more excellent as a light source for a lamp for illumination.
　本発明の白色ＬＥＤ素子は、先に説明したように、砲弾型、表面実装型のいずれのタイプも採用できるが、図５に示すように、白色ＬＥＤ素子１を複数個、配線基板１２上に配列・搭載して白色ＬＥＤユニット１１を形成する場合には、表面実装型が好ましい。 As the white LED element of the present invention, as described above, any type of shell type or surface mounting type can be adopted, but as shown in FIG. 5, a plurality of white LED elements 1 on the wiring substrate 12 When the white LED units 11 are formed by arraying and mounting, a surface mounting type is preferable.
　図５においては、電線Ａ１３から白色ＬＥＤユニット１１に供給された電気は、リードフレームＡ８→ワイヤー１０→青色発光ＬＥＤ３→ワイヤー１０→リードフレームＡ’８’という経路で右上の白色ＬＥＤ素子１中を流れ、同様に次々と次の白色ＬＥＤ素子１中を流れた後、電線Ａ’１３’から白色ＬＥＤユニット１１外に流される。 In FIG. 5, the electricity supplied from the electric wire A13 to the white LED unit 11 passes through the white LED element 1 in the upper right along a route of lead frame A8 → wire 10 → blue light emitting LED3 → wire 10 → lead frame A′8 ′. Similarly, after flowing in the next white LED element 1 one after another, the electric current flows from the electric wire A ′ 13 ′ to the outside of the white LED unit 11.
　また、電線Ｂ１４から白色ＬＥＤユニット１１に供給された電気は、リードフレームＢ９→ワイヤー１０→赤色発光ＬＥＤ４→ワイヤー１０→リードフレームＢ’９’という経路で右上の白色ＬＥＤ素子１中を流れ、同様に次々と次の白色ＬＥＤ素子１中を流れた後、電線Ｂ’１４’から白色ＬＥＤユニット１１外に流される。 In addition, the electricity supplied from the electric wire B14 to the white LED unit 11 flows in the upper right white LED element 1 in the route of lead frame B9 → wire 10 → red light emitting LED 4 → wire 10 → lead frame B'9 ' After flowing through the next white LED element 1 one after another, the electric wire B ′ 14 ′ flows out of the white LED unit 11.
　このように、本発明の白色ＬＥＤ素子を、複数個、配線基板上に配列・搭載して白色ＬＥＤユニット１１とすることにより、照明用ランプに適した白色光を得ることができる。白色ＬＥＤユニットに設けられる白色ＬＥＤ素子１の数、配置などは、必要とされる光源の照度、形状（ランプ形、蛍光灯形）など応じ、適宜設計することができる。 Thus, white light suitable for a lamp for illumination can be obtained by arranging and mounting a plurality of the white LED elements of the present invention on the wiring substrate to form the white LED unit 11. The number, arrangement, and the like of the white LED elements 1 provided in the white LED unit can be appropriately designed according to the required illumination intensity and shape (lamp shape, fluorescent lamp shape) of the light source.
　以上に説明したように、本発明の白色ＬＥＤ素子は、青色発光ＬＥＤと黄色蛍光体を組み合わせた白色ＬＥＤ素子に赤色発光ＬＥＤを設けると共に、青色発光ＬＥＤおよび赤色発光ＬＥＤをそれぞれ別の電源に接続し、青色発光ＬＥＤに供給される電流と、赤色発光ＬＥＤに供給される電流との比を、１：０．３～０．６とすることにより、ブルーライトを低減できると共に、照明用ランプに適した明るさ、演色性、色温度を有する白色光を得ることのできる優れたものである。また、この白色ＬＥＤ素子を複数個、配線基板上に配列・搭載して白色ＬＥＤユニットとすることにより、照明用ランプに適した白色光を得ることができる。 As described above, in the white LED element of the present invention, the red LED is provided on the white LED element combining the blue light emitting LED and the yellow phosphor, and the blue light emitting LED and the red light emitting LED are connected to different power supplies. Blue light can be reduced by setting the ratio of the current supplied to the blue light emitting LED to the current supplied to the red light emitting LED at 1: 0.3 to 0.6, and a lamp for lighting It is excellent for obtaining white light with suitable brightness, color rendering and color temperature. Further, by arranging and mounting a plurality of the white LED elements on the wiring substrate to form a white LED unit, white light suitable for a lamp for illumination can be obtained.
１　　　　白色ＬＥＤ素子
２　　　　パッケージ
３　　　　青色発光ＬＥＤ
４　　　　赤色発光ＬＥＤ
５　　　　黄色蛍光体
６　　　　光拡散剤
７　　　　透明樹脂組成物
８　　　　リードフレームＡ
８’　　　リードフレームＡ’
９　　　　リードフレームＢ
９’　　　リードフレームＢ’
１０　　　ワイヤー
１１　　　白色ＬＥＤユニット
１２　　　配線基板
１３　　　電線Ａ
１３’　　電線Ａ’
１４　　　電線Ｂ
１４’　　電線Ｂ’
２０　　　光色可変ＬＥＤランプを構成する回路
２１　　　青色ＬＥＤチップ
２１ａ　　青色ＬＥＤチップの発光強度を調整する発光強度調整手段
２２　　　赤色ＬＥＤチップ
２２ａ　　赤色ＬＥＤチップの発光強度を調整する発光強度調整手段 1 White LED element 2 Package 3 Blue light emitting LED
4 red light emitting LED
5 yellow phosphor 6 light diffusing agent 7 transparent resin composition 8 lead frame A
8 'Lead frame A'
9 Lead frame B
9 'Lead frame B'
10 Wire 11 White LED Unit 12 Wiring Board 13 Electric Wire A
13 'Wire A'
14 Wire B
14 'Wire B'
20 Circuits constituting a light color variable LED lamp 21. Blue LED chip 21a Luminescent intensity adjusting means 22 for adjusting the luminous intensity of blue LED chip Red LED chip 22a Emissive intensity adjusting means for adjusting luminous intensity of red LED chip

Claims (6)

  1. 　断面凹字型に形成されたパッケージの凹部の底面に、青色発光ＬＥＤおよび赤色発光ＬＥＤを配置し、透明樹脂、黄色蛍光体及び光拡散剤を含有する透明樹脂組成物で封止してなる白色ＬＥＤ素子であって、
    　前記青色発光ＬＥＤおよび前記赤色発光ＬＥＤがそれぞれ別の電源に接続され、
    　前記青色発光ＬＥＤに供給される電流と、前記赤色発光ＬＥＤに供給される電流との比を、１：０．３～０．６とすることを特徴とする、ブルーライトを低減した白色ＬＥＤ素子。     A white color formed by disposing a blue light emitting LED and a red light emitting LED on the bottom of a concave portion of a package formed in a concave cross-sectional shape and sealing with a transparent resin composition containing a transparent resin, a yellow phosphor and a light diffusing agent LED elements,
    The blue light emitting LED and the red light emitting LED are respectively connected to different power supplies;
    A ratio of a current supplied to the blue light emitting LED to a current supplied to the red light emitting LED is 1: 0.3 to 0.6. A blue light reduced white LED element .
  2. 　前記透明樹脂組成物の透明樹脂がシリコン樹脂であることを特徴とする、請求項１に記載の白色ＬＥＤ素子。 The white resin LED according to claim 1, wherein the transparent resin of the transparent resin composition is a silicone resin.
  3. 　前記透明樹脂組成物の光拡散剤が硫化亜鉛化合物（ＺｎＳ－Ａｇ）であることを特徴とする、請求項１または２に記載の白色ＬＥＤ素子。 The light diffusing agent of the said transparent resin composition is a zinc sulfide compound (ZnS-Ag), The white LED element of Claim 1 or 2 characterized by the above-mentioned.
  4. 　前記硫化亜鉛化合物（ＺｎＳ－Ａｇ）が、
    　塩化物を含む硫化亜鉛と、主要な活性剤としての硫酸マンガンと、塩化ハフニウムと、酸化亜鉛と、塩化バリウムと、塩化マグネシウムと、塩化イリジウムと、硫酸銀と、酸化ガリウムと、硫黄と、塩化ナトリウムと、を混合して、当該混合物を１２５０℃で２時間加熱した後、焼成物から残留フラックスを水洗により除去して、乾燥後、分級粉砕して粒子を一定にし、
    　当該一定にした粒子に、硫化亜鉛と、塩化バリウムと、塩化ナトリウムと、塩化マグネシウムと、硫酸マンガンと、ガリウムと、硫黄と、を加えて、窒素気流中７３０℃で８時間３０分熱した後再度分級粉砕し、脱イオン水で洗浄した後、酢酸で洗浄して、再度脱イオン水で洗浄した後、さらにＫＣＮで洗浄することで活性化した粒子
    であることを特徴とする、請求項３に記載の白色ＬＥＤ素子。     The zinc sulfide compound (ZnS-Ag) is
    Zinc sulfide containing chloride, manganese sulfate as main activator, hafnium chloride, zinc oxide, barium chloride, magnesium chloride, iridium chloride, silver sulfate, gallium oxide, sulfur and chloride After mixing sodium and heating the mixture at 1250 ° C. for 2 hours, the residual flux is removed from the calcined product by washing with water, and after drying, classification grinding is performed to make the particles constant.
    After adding zinc sulfide, barium chloride, sodium chloride, magnesium chloride, manganese sulfate, gallium and sulfur to the fixed particles and heating in a nitrogen stream at 730 ° C. for 8 hours and 30 minutes The particles are characterized by being classified and pulverized again, washed with deionized water, then washed with acetic acid, washed again with deionized water, and further washed with KCN to thereby activate the particles. The white LED element as described in.
  5. 　前記白色ＬＥＤ素子が表面実装型であることを特徴とする、請求項１～４のいずれかに記載の白色ＬＥＤ素子。 The white LED element according to any one of claims 1 to 4, wherein the white LED element is a surface mounting type.
  6. 　請求項５に記載の白色ＬＥＤ素子を、複数個、配線基板上に配列・搭載した白色ＬＥＤユニット。 A white LED unit in which a plurality of the white LED elements according to claim 5 are arranged and mounted on a wiring board.
PCT/JP2018/034001 2017-09-14 2018-09-13 White led element in which blue light is reduced, and white led unit in which plurality of said white led elements are arrayed and mounted on wiring substrate WO2019054447A1 (en)

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