| Fabrication of High-power White LEDs and White Light Uniformity Testing |
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| 引用本文： | YU Xin-mei RAO Hai-bo HU Yue LI Jun-fei HOU Bin. Fabrication of High-power White LEDs and White Light Uniformity Testing[J]. 半导体光子学与技术, 2007, 13(2): 97-103 |
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| 作者姓名： | YU Xin-mei RAO Hai-bo HU Yue LI Jun-fei HOU Bin |
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| 作者单位： | School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, CHN |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | As the blue and yellow lights are complementary colors, a blue InGaN LED chip is coated hy a yellow phosphor film to generate white light based on luminescence conversion mechanism. The emitted light of a blue LED is used as the primary source for exciting fluorescent material such as cerium doped yttrium aluminum garnet with the formula Y3Al2O12 ： Ce^3＋ （in short： YAG ： Ce^3＋ ）. The matching of the spectrum of the blue LED chips and the YAG ： Ce^3＋ yellow phosphor is studied to improve the conversion efficiency. The packaging methods and manufacturing processes for high power single chip-white LEDs are introduced. The uniformity of the output white light is investigated. Based on the characteristics of the high power white LEDs, some approaches and processes are suggested to improve the light uniformity when they are fabricated. The effectiveness of those approaches on the improvement of LEDs is discussed in detail and some interesting conclusions are also presented.
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| 关 键 词： | 大功率白光LED 制造 封装 白光均一性 测试 |
| 文章编号： | 1007-0206（2007）02-0097-07 |
| 收稿时间： | 2006-09-26 |
| 修稿时间： | 2006-10-28 |
Fabrication of High-power White LEDs and White Light Uniformity Testing |
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| YU Xin-mei,RAO Hai-bo,HU Yue,LI Jun-fei,HOU Bin. Fabrication of High-power White LEDs and White Light Uniformity Testing[J]. Semiconductor Photonics and Technology, 2007, 13(2): 97-103 |
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| Authors: | YU Xin-mei RAO Hai-bo HU Yue LI Jun-fei HOU Bin |
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| Abstract: | As the blue and yellow lights are complementary colors,a blue InGaN LED chip is coated by a yellow phosphor film to generate white light based on luminescence conversion mechanism.The emitted light of a blue LED is used as the primary source for exciting fluorescent material such as cerium doped yttrium aluminum garnet with the formula Y3Al5O12:Ce3 (in short:YAG:Ce3 ).The matching of the spectrum of the blue LED chips and the YAG:Ce3 yellow phosphor is studied to improve the conversion efficiency.The packaging methods and manufacturing processes for high-power single-chip-white-LEDs are introduced.The uniformity of the output white light is investigated.Based on the characteristics of the high-power white LEDs,some approaches and processes are suggested to improve the light uniformity when they are fabricated.The effectiveness of those approaches on the improvement of LEDs is discussed in detail and some interesting conclusions are also presented. |
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| Keywords: | solid-state lighting high-power white LED packaging phosphor layer matching uniformity |
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