[OPTICAL REVIEW Vol. 18, No. 1 (2011) 76-79]
© 2011 The Japan Society of Applied Physics

Practical Issues for Two-Light-Sources Model of Phosphor-Based White Light-Emitting Diode

Lin-Ann HONG*, Chung-Jen OU1*,†, Yu-Cheng CHANG*, and Fuh-Shyang JUANG*

Institute of Electro-Optical and Materials Science, National Formosa University, Taiwan
1Department of Electrical Engineering, Hsiuping Institute of Technology, Taiwan

(Received June 8, 2010; Accepted October 5, 2010)

We report an intuitive approach to simulating the performance of the phosphor-based light emitting diode (LED) by using the two-light-sources model for an optimized LED lens. The optimized secondary lens shape is achieved by approaching a uniform energy distribution on the detecting plane. Both the spectrum and spatial apodization of the LED structure are discussed, and the results indicate that the two-light-sources model can solve the misleading design on the phosphor-based LED due to imperfect color mixing of light source, that one can satisfy the highly uniformity requirement for specific applications, such as display backlight or optogenetic.

Key words: light emitting diode, lens design

*Equal contribution.
E-mail address: crou@mail.hit.edu.tw