发明授权
- 专利标题: Light-emitting device including light-emitting diode and stacked light-emitting phosphor layers
- 专利标题(中): 发光装置包括发光二极管和堆叠的发光荧光体层
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申请号: US12382040申请日: 2009-03-06
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公开(公告)号: US07897987B2公开(公告)日: 2011-03-01
- 发明人: Mitsuhiro Inoue , Kenji Ito , Kazuyohi Tomita , Tetsu Kachi , Takahiro Kozawa , Satoru Kato , Tadashi Ichikawa
- 申请人: Mitsuhiro Inoue , Kenji Ito , Kazuyohi Tomita , Tetsu Kachi , Takahiro Kozawa , Satoru Kato , Tadashi Ichikawa
- 申请人地址: JP Nishikasugai-gun, Aichi-ken
- 专利权人: Toyoda Gosei Co., Ltd.
- 当前专利权人: Toyoda Gosei Co., Ltd.
- 当前专利权人地址: JP Nishikasugai-gun, Aichi-ken
- 代理机构: McGinn IP Law Group, PLLC
- 优先权: JP2008-087591 20080328
- 主分类号: H01L33/00
- IPC分类号: H01L33/00
摘要:
A light-emitting device includes a light-emitting diode, a red light-emitting phosphor layer, a yellow light-emitting phosphor layer, and a blue light-emitting phosphor layer. These layers are stacked in the stacking sequence of the yellow, blue, and red phosphor layers in order of increasing distance from the LED. The stacking sequence of the yellow and blue phosphor layers is first determined in such a manner that these layers do not interact with each other. The stacking sequence of the red and yellow phosphor layers and the stacking sequence of the red and blue phosphor layers are determined by the discriminant D. This determination of the stacking sequence suppresses a reduction in the conversion efficiency of the phosphors due to concentration quenching, improving the emission efficiency of the light-emitting device.
公开/授权文献
- US20090242917A1 Light-emitting device including light-emitting diode 公开/授权日:2009-10-01