Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package

被引：23
作者：
Chen, H. C. [1 ,2 ]
Chen, K. J. [1 ,2 ]
Lin, C. C. [3 ]
Wang, C. H. [1 ,2 ]
Yeh, C. C. [1 ,2 ]
Tsai, H. H. [1 ,2 ]
Shih, M. H. [4 ]
Kuo, H. C. [1 ,2 ]
机构：
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan
[2] Natl Chiao Tung Univ, Inst Electroopt Engn, Hsinchu 30010, Taiwan
[3] Natl Chiao Tung Univ, Inst Lighting & Energy Photon, Guiren Township 711, Tainan County, Taiwan
[4] Acad Sinica, Res Ctr Appl Sci, Taipei 115, Taiwan
来源：
MICROELECTRONICS RELIABILITY | 2012年 / 52卷 / 05期
关键词：
REMOTE PHOSPHOR;
D O I：
10.1016/j.microrel.2012.02.011
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this paper, white light-emitting diodes (LEDs) with air-gap embedded package were proposed and fabricated by a simple method including pulsed spray coating. The lumen efficiency of air-gap embedded LED was enhanced by 8.8% at driving current of 350 mA, compared to conventional remote phosphor white LED. This improvement was due to the enhanced utilization of blue and yellow rays, which were confirmed by pulse current-dependent correlated color temperature (CCT). The utilization efficiency of blue rays was enhanced by 12.4% due to the embedded air-gap layer. The simulation results performed by Monte-Carlo ray tracing method agreed with our experiments, which showed enhancement in lumen efficiency and similar CCT. Finally, the electric field intensity versus different thickness for air-gap and no air-gap embedded white LED was calculated to check the incident blue rays trapped in phosphor layer. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：933 / 936
页数：4
相关论文
共 9 条
  • [1] Fan B, 2007, IEEE PHOTONIC TECH L, V19, P15
  • [2] Huang HT, 2010, OPT EXPRESS, V102, P21
  • [3] Strongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cup
    Kim, JK
    Luo, H
    Schubert, EF
    Cho, JH
    Sone, CS
    Park, YJ
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2005, 44 (20-23): : L649 - L651
  • [4] Krames Michael R, 2007, DISP TECHNOL, V3
  • [5] Patterned structure of REMOTE PHOSPHOR for phosphor-converted white LEDs
    Kuo, Hao-Chung
    Hung, Cheng-Wei
    Chen, Hsin-Chu
    Chen, Kuo-Ju
    Wang, Chao-Hsun
    Sher, Chin-Wei
    Yeh, Chia-Chi
    Lin, Chien-Chung
    Chen, Cheng-Huan
    Cheng, Yuh-Jen
    [J]. OPTICS EXPRESS, 2011, 19 (14): : A930 - A936
  • [6] Ring Remote Phosphor Structure for Phosphor-Converted White LEDs
    Lin, Ming-Te
    Ying, Shang-Ping
    Lin, Ming-Yao
    Tai, Kuang-Yu
    Tai, Sheng-Chieh
    Liu, Chih-Hsuan
    Chen, Jyh-Chen
    Sun, Ching-Cherng
    [J]. IEEE PHOTONICS TECHNOLOGY LETTERS, 2010, 22 (08) : 574 - 576
  • [7] Narendra N., 2005, P SOC PHOTO-OPT INS, V5941
  • [8] Narendran N, 2005, PHYS STATE SOLID, V202
  • [9] Zhu Y, 2008, J LIGHT VIS ENV, V32, P2
1