Title: Improvement of emission uniformity by using micro-cone patterned PDMS film
Authors: Liu, Che-Yu
Chen, Kuo-Ju
Lin, Da-Wei
Lee, Chia-Yu
Lin, Chien-Chung
Chien, Shih-Hsuan
Shih, Min-Hsiung
Chi, Gou-Chung
Chang, Chun-Yen
Kuo, Hao-Chung
Institute of Photonic System
Department of Electronics Engineering and Institute of Electronics
Issue Date: 24-Feb-2014
Abstract: Micro-patterned PDMS film was fabricated and combined with LED chip on board (COB) package to improve the emission uniformity of LED chip. The micro scale patterned sapphire substrate (PSS) was used as a mold to fabricate micro-cone patterned PDMS (MC-PDMS) film. A strong scattering effect from this MC-PDMS film can be verified by the high haze ratio and the Bi-directional Transmission effect. The angle dependent color temperature measurement system was used to measure the Delta CCT of COB with and without MC-PDMS. The measurement results indicate that the Delta CCT was reduced from 1025K to 428K. This improvement can effectively eliminate the yellow ring effect of LED chip. This technology can be thus considered as a cost-effective way for the next generation of light source packages. (C) 2014 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.22.004516
ISSN: 1094-4087
DOI: 10.1364/OE.22.004516
Volume: 22
Issue: 4
Begin Page: 4516
End Page: 4522
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