Lin-Ann HONG^*, Chung-Jen OU^1*,†, 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