J. Semicond. > 2013, Volume 34 > Issue 5 > 053008
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SEMICONDUCTOR MATERIALS

Optical simulation of phosphor layer of white LEDs

Junyuan Liao, Haibo Rao, Wei Wang, Xianlong Wan, Linsong Zhou, Da Zhou, Xuemei Wang and Qiaolin Lei

+ Author Affiliations

 Corresponding author: Liao Junyuan, Email:Vincent_2010@126.com

DOI: 10.1088/1674-4926/34/5/053008

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Abstract: A Matlab (2009a) program was developed to simulate the photons emitted by the LED chips. The photons' transmission, reflection, and refraction in phosphor layers with different shapes were calculated in this program. The CCT was calculated at different emergent angles with different layer profiles, such as planar layer, hemispherical layer (with different diameters), half ellipsoid layer and other irregular shapes. As a consequence of optimization of angular color uniformity, the trend of configuration of the phosphor layer was discussed and analyzed.

Key words: Monte Carlo method, white LED, CCT, YAG:Ce3+ phosphor coating



[1]
Hou B, Rao H, Li J, et al. Phosphor coating technique with slurry method in application of white LED. Proc SPIE, 2008, 6841:684106
[2]
Li Junfei, Rao Haibo, Hou Bin, et al. Improving the luminescence efficiency of power white LEDs with slurry. Journal of Semiconductors, 2008, 29(5):984(in Chinese) http://www.jos.ac.cn/bdtxbcn/ch/reader/view_abstract.aspx?file_no=07101102&flag=1
[3]
Yu X, Rao H, Hu Y, et al. A phosphor coating process for white LEDs application. ISTC, Packaging and Assembly, Shanghai, China, 2007: 864
[4]
Gee J M, Tsao J Y, Simmons J A. Prospects for LED lighting. Proc SPIE, 2004, 5187:227 doi: 10.1117/12.504813
[5]
Burgess. LED update:alternate packaging improves white LEDs. Photonics Spectra, 2005, 39(7):118
[6]
Luo H, Kim J K, Schubert, et al. Analysis of high-power packages for phosphor-based white-light-emitting diodes. Appl Phys Lett, 2005, 86(24):243
[7]
Sun Xu. Optical design and measurement of white LED's phosphor layer. Zhejiang University, 2006
[8]
Li Fenlin. On an optimization method for rejection. Journal on Numerical Methods and Computer Applications, 1982, (4): 241(in Chinese)
[9]
Ju Jianjun. A new phosphor coating process for power white LEDs. Master Thesis, University of Electronic Science and Technology of China, 2010(in Chinese)
Fig. 1.  Emission spectrum of GaN chips.

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Fig. 2.  Emission spectrum simulated.

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Fig. 3.  The emission spectrum emitted by sample 1.

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Fig. 4.  The CCT received by the screen.

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Fig. 5.  CCT in different emergent angles.

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Fig. 6.  Emission spectra in different emergent angles.

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Fig. 7.  Emission spectra in different emergent angles.

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Fig. 8.  The emission spectrum by sample 2.

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Fig. 9.  The CCT received by the screen.

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Fig. 10.  CCT in different emergent angles.

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Fig. 11.  Emission spectra in different emergent angles.

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Fig. 12.  Emission spectra in different emergent angles.

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Fig. 13.  The emission spectrum by sample 3.

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Fig. 14.  The CCT received by the screen.

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Fig. 15.  CCT in different emergent angles.

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Fig. 16.  Emission spectra in different emergent angles.

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Fig. 17.  CCT in different emergent angles.

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Fig. 18.  The emission spectrum of sample 4.

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Fig. 19.  CCT in different emergent angles.

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Fig. 20.  The emission spectrum of sample 5.

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[1]
Hou B, Rao H, Li J, et al. Phosphor coating technique with slurry method in application of white LED. Proc SPIE, 2008, 6841:684106
[2]
Li Junfei, Rao Haibo, Hou Bin, et al. Improving the luminescence efficiency of power white LEDs with slurry. Journal of Semiconductors, 2008, 29(5):984(in Chinese) http://www.jos.ac.cn/bdtxbcn/ch/reader/view_abstract.aspx?file_no=07101102&flag=1
[3]
Yu X, Rao H, Hu Y, et al. A phosphor coating process for white LEDs application. ISTC, Packaging and Assembly, Shanghai, China, 2007: 864
[4]
Gee J M, Tsao J Y, Simmons J A. Prospects for LED lighting. Proc SPIE, 2004, 5187:227 doi: 10.1117/12.504813
[5]
Burgess. LED update:alternate packaging improves white LEDs. Photonics Spectra, 2005, 39(7):118
[6]
Luo H, Kim J K, Schubert, et al. Analysis of high-power packages for phosphor-based white-light-emitting diodes. Appl Phys Lett, 2005, 86(24):243
[7]
Sun Xu. Optical design and measurement of white LED's phosphor layer. Zhejiang University, 2006
[8]
Li Fenlin. On an optimization method for rejection. Journal on Numerical Methods and Computer Applications, 1982, (4): 241(in Chinese)
[9]
Ju Jianjun. A new phosphor coating process for power white LEDs. Master Thesis, University of Electronic Science and Technology of China, 2010(in Chinese)

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    Received: 27 November 2012 Revised: Online: Published: 01 May 2013

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      Article Navigation >  Journal of Semiconductors  > 2013  >  34(5): 053008
      Junyuan Liao, Haibo Rao, Wei Wang, Xianlong Wan, Linsong Zhou, Da Zhou, Xuemei Wang, Qiaolin Lei. Optical simulation of phosphor layer of white LEDs[J]. Journal of Semiconductors, 2013, 34(5): 053008. doi: 10.1088/1674-4926/34/5/053008 ****J Y Liao, H B Rao, W Wang, X L Wan, L S Zhou, D Zhou, X M Wang, Q L Lei. Optical simulation of phosphor layer of white LEDs[J]. J. Semicond., 2013, 34(5): 053008. doi: 10.1088/1674-4926/34/5/053008.
      Citation:
      Junyuan Liao, Haibo Rao, Wei Wang, Xianlong Wan, Linsong Zhou, Da Zhou, Xuemei Wang, Qiaolin Lei. Optical simulation of phosphor layer of white LEDs[J]. Journal of Semiconductors, 2013, 34(5): 053008. doi: 10.1088/1674-4926/34/5/053008 ****
      J Y Liao, H B Rao, W Wang, X L Wan, L S Zhou, D Zhou, X M Wang, Q L Lei. Optical simulation of phosphor layer of white LEDs[J]. J. Semicond., 2013, 34(5): 053008. doi: 10.1088/1674-4926/34/5/053008.
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      Optical simulation of phosphor layer of white LEDs

      DOI: 10.1088/1674-4926/34/5/053008

      • University of Electronic Science and Technology of China, Chengdu 610051, China

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      • Corresponding author: Liao Junyuan, Email:Vincent_2010@126.com
      • Received Date: 2012-11-27
      • Published Date: 2013-05-01

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