caa a22 4500 606244204 CHVBK 20210128101329.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s12596-015-0239-8 doi (NATIONALLICENCE)springer-10.1007/s12596-015-0239-8 Studies on light extraction design of white LEDs with high luminous efficiency and uniformity [Elektronische Daten] [Yan Shi, Longwu Wang, Haijun Chen] In this paper a new planar optical system with patterned phosphor-layer structures is demonstrated. The phosphor film herein acts as a wavelength converter and a light diffuser simultaneously. The patterned structures can increase the depth of blue ray intrude into phosphor film. The absorption rate of blue ray and the utilization efficiency of phosphors are increased. So the luminous efficiency is improved. Given different patterns on the phosphor layer surface, the optical properties of the proposed optical system, light-emitting efficiency and uniformity, are studied. Eventually, an average irradiance of 58.372W/m2 and a more appropriate color temperature of the lighting source for high quality optical system were achieved. Phosphor layer of flat and part-etched pattern were compared in irradiance. The result validates part-etched phosphor-layer produce 2.57% higher average irradiance than flat phosphor-layer. The patterned area on phosphor-layer can increase the extraction efficiency of blue rays at periphery part, the uniformity of correlated color temperature (CCT) at periphery area is significantly improved, the light candela distribution of output light are adjusted by the patterns, so the illumination uniformity of planar optical system is adjusted. Finally, the yellow circle phenomenon of planar optical system is effectively improved by the given patterns. Then it will be utilized in high quality planar optical system. The Optical Society of India, 2015 Planar optical system nationallicence Pattern nationallicence Phosphor film nationallicence Illumination uniformity nationallicence Light-emitting efficiency nationallicence Shi Yan College of Optical and Electronic Technology, China Jiliang University, Xueyuan Street No.258, Xiasha Higher Education District, 310018, Hangzhou City, China aut Wang Longwu College of Optical and Electronic Technology, China Jiliang University, Xueyuan Street No.258, Xiasha Higher Education District, 310018, Hangzhou City, China aut Chen Haijun Ningbo Liaoyuan Lighting Co., Ltd, 315408, Yuyao, China aut Journal of Optics Springer India 44/2(2015-06-01), 136-145 0972-8821 44:2<136 2015 44 12596 https://doi.org/10.1007/s12596-015-0239-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s12596-015-0239-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shi Yan College of Optical and Electronic Technology, China Jiliang University, Xueyuan Street No.258, Xiasha Higher Education District, 310018, Hangzhou City, China aut NATIONALLICENCE 700 1- Wang Longwu College of Optical and Electronic Technology, China Jiliang University, Xueyuan Street No.258, Xiasha Higher Education District, 310018, Hangzhou City, China aut NATIONALLICENCE 700 1- Chen Haijun Ningbo Liaoyuan Lighting Co., Ltd, 315408, Yuyao, China aut NATIONALLICENCE 773 0- Journal of Optics Springer India 44/2(2015-06-01), 136-145 0972-8821 44:2<136 2015 44 12596