Photonics Research, 2016, 4 (4): 04000140, Published Online: Sep. 29, 2016  

Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film Download: 1560次

Author Affiliations
1 Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510640, China
2 Optoelectronics Engineering Technology Research and Development Center, Foshan Nationstar Optoelectronics Co. Ltd., Foshan 528000, China
Abstract
Angular color uniformity (ACU) is a key factor used to evaluate the light quality of white-light emitting diodes (LEDs). In this study, a novel double remote micro-patterned phosphor film (double RMPP film) was used to enhance the ACU of a remote phosphor (RP) down-light lamp. A conventional RP film and remote phosphor film with single micro-patterned film (single RMPP film) also were examined for comparison. The angular correlated color temperature (CCT) distributions and the optical performance of the films were experimentally measured. The measurement results showed that double RMPP film configuration exhibited better color uniformity with a CCT deviation of only 441 K, compared with 556 K for the single RMPP film configuration and 1390 K for the RP film configuration. A simulation based on FDTD and ray tracing combined method also confirmed the ACU improvement. In addition, compared with the conventional RP film, the luminous efficiency of single and double RMPP film configurations was increased by 6.68% and 4.69%, respectively, at a driving current of 350 mA. The enhancement of the ACU and luminous efficiency are due to the scattering and mixing effect of the micropatternedfilm. Moreover, the double RMPP film configuration had better CCT stability at different currents than the other two configurations. The results demonstrated the effectiveness and superiority of double RMPP film in white LED applications.

Shudong Yu, Zongtao Li, Guanwei Liang, Yong Tang, Binhai Yu, Kaihang Chen. Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film[J]. Photonics Research, 2016, 4(4): 04000140.

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