Color uniformity enhancement for COB WLEDs using a remote phosphor film with two freeform surfaces
Color uniformity enhancement for COB WLEDs using a remote phosphor film with two freeform surfaces
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使用具有两个自由曲面的远程荧光膜增强 COB WLED 的颜色均匀性
DOI：
10.1364/oe.24.023685
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发表时间：
2016-10-17
期刊：
影响因子：
3.8
通讯作者：
Ding, Xinrui
中科院分区：
文献类型：
--
作者：
Li, Jiasheng;Li, Zongtao;Ding, Xinrui
采用具有两个自由曲面的远程荧光膜（TFS-RPF）改善了板上芯片（COB）白色发光二极管（WLED）的颜色均匀性（CU）。采用时域有限差分法（FDTD）、蒙特卡罗射线追踪法和色厚反馈法（CTFB）设计了TFS-RPF：TFSRPF的角厚度分布对COB WLED的蓝光分布有很大影响，可以通过迭代获得高的CU。研究了入射和出射蓝光的方向不一致性、TFS-RPF的散射效应以及COB光源的照明特性。含有优化的TFS-RPF的COB WLED实现了高CU，最大CCT偏差降低了26.2%;因此，TFS-RPF可以提高COB WLED的CU。(C)2016美国光学学会
The color uniformity (CU) of chip-on-board (COB) white light emitting diodes (WLEDs) has been improved by using remote phosphor films with two freeform surfaces (TFS-RPFs). The finite-difference time-domain (FDTD), Monte Carlo ray-tracing, and colorthickness feedback (CTFB) methods were used to design the TFS-RPFs: the blue light distribution of COB WLEDs is greatly affected by the angular thickness distribution of TFSRPFs, and a high CU can be achieved iteratively. The directional inconsistency of incident and emergent blue light, scattering effect of TFS-RPFs, and illumination characteristics of the COB source were also investigated. COB WLEDs containing optimized TFS-RPFs achieved high CU with a decrease of 26.2% in maximum CCT deviation; thus, TFS-RPFs can improve the CU of COB WLEDs. (C) 2016 Optical Society of America