Invention Grant
- Patent Title: Light-emitting device including light-emitting diode and stacked light-emitting phosphor layers
- Patent Title (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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Application No.: US12382040Application Date: 2009-03-06
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Publication No.: US07897987B2Publication Date: 2011-03-01
- Inventor: Mitsuhiro Inoue , Kenji Ito , Kazuyohi Tomita , Tetsu Kachi , Takahiro Kozawa , Satoru Kato , Tadashi Ichikawa
- Applicant: Mitsuhiro Inoue , Kenji Ito , Kazuyohi Tomita , Tetsu Kachi , Takahiro Kozawa , Satoru Kato , Tadashi Ichikawa
- Applicant Address: JP Nishikasugai-gun, Aichi-ken
- Assignee: Toyoda Gosei Co., Ltd.
- Current Assignee: Toyoda Gosei Co., Ltd.
- Current Assignee Address: JP Nishikasugai-gun, Aichi-ken
- Agency: McGinn IP Law Group, PLLC
- Priority: JP2008-087591 20080328
- Main IPC: H01L33/00
- IPC: H01L33/00

Abstract:
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.
Public/Granted literature
- US20090242917A1 Light-emitting device including light-emitting diode Public/Granted day:2009-10-01
Information query
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