the light distribution of our self-developed integration package of LED is simulated. In order to optimize the light distribution and extraction of the model
the different shapes of lens and inclination of reflectors were analyzed. The results of simulation show that there is a strong impact on light distribution with different lens and reflectors. There is an uniform light distribution with the 45? reflector. The light extraction will be improved by lens
meanwhile the flat lens can achieve a higher light extraction. The 45? reflector with hemispherical lens can achieve a balance between light distribution and extraction.
关键词
Keywords
references
Li Y Q, van Steen J E J, van Kervel J W H, et al. Luminescence properties of red-emitting M2Si5N8 :Eu2+(M=Ca, Sr, Ba) LED conversion phosphors [J]. Journal of Alloys and Compounds, 2006, 417(1):273-279.[2] Sun X Y, Zhang J H, Zhang X, et al. A green-yellow emitting β-Sr2SiO4 :Eu2+ phosphor for near ultraviolet chipwyhite-light-emitting diode [J]. J. Rare Earth, 2008, 26(3):421-424.[3] Zhu C F, Liang X L,Yang Y X, et al. Luminescence properties of Tb doped and Tm/Tb/Sm co-doped glasses for LEDappications [J]. J. Lumin., 2010, 130(1):74-77.[4] Jung K Y, Kim J H, Kang Y C. Luminescence enhancement of Eu-doped calcium magnesium silicate blue phosphor for UV-LED application [J]. J. Lumin., 2009, 129(6): 615-619.[5] Nishida T, Saito H, Kobayashi N. Efficient and high-power AlGaN-based ultraviolet light-emitting diode grown on bulk GaN [J]. Appl. Phys. Lett., 2001, 79(6):711-712.[6] Fujii T, Gao Y, Sharma R,et al. Increase in the extraction efficiency of Gan-based light-emitting diodes via surface roughening [J].Appl. Phys. Lett., 2004, 84(6):855-857.[7] Niu N H, Wang H B, Liu J P,et al. Enhanced luminescence of InGaN/GaN multiple quantum wells by strain reduction [J].Solid-State Electronics, 2007, 51(6):860-864.[8] Huang H W, Kao C C, Chu J T,et al. Improvement of InGaN-GaN light-emitting diode performance with a nano-roughened p-GaN surface [J]. IEEE Photonics Technology Lett., 2005, 17(5):983-985.[9] Luo H, Kim J K, Schubert E F,et al. Trapped whispering-gallery optical modes in white light-emitting diode lamps with remote phosphor [J]. Appl. Phys. Lett., 2006, 89(4):041125.[10] 田大垒, 关荣锋,王杏. 新型封装材料与大功率封装热管理 [J]. 电子元件与材料, 2007, 26(8):5-9.[11] 严萍, 李剑清. 照明用LED光学系统的计算机辅助设计 [J]. 半导体光电, 2004, 25(3):181-200.