Composition and structure design of three-layered composite phosphors for high color rendering chip-on-board light-emitting diode devices

Journal of Advanced Ceramics

Rongjun Xie¹  Peng Zheng¹  Yagang Feng²  Yun Shi²  Xin Liu²  Xiaopu Chen²  Jiang Li²  Xinglu Qian³  Jun Zou⁴ 

[1] College of Materials, Xiamen University, 361005, Xiamen, China;Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 201899, Shanghai, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China;School of Science, Shanghai Institute of Technology, 201418, Shanghai, China;School of Science, Shanghai Institute of Technology, 201418, Shanghai, China;Institute of New Materials & Industrial Technology, Wenzhou University, 325024, Wenzhou, China;

关键词: three-layered composite phosphor;    structure design;    high color rendering;    luminous efficacy;   

DOI  :  10.1007/s40145-021-0467-0

来源: Springer

【 摘 要 】

A three-layered phosphor structure was designed and prepared by the spin coating of BaSi2N2O2:Eu (cyan-emitting) and (Sr,Ca)AlSiN3:Eu (red-emitting) phosphor films on the yellow-emitting Y3Al5O12:Ce (YAG:Ce) phosphor ceramic synthesized by the solid-state reaction under vacuum sintering. In order to achieve high color rendering lighting, the influence of the composition and structure of the three-layered phosphors on the optical, thermal, and electrical properties of the chip-on-board (COB) packaged white-light-emitting diodes (WLEDs) was studied systematically. The WLED with the structure of “red+cyan+yellow” (R+C+Y) three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W, the fidelity index (Rf) of 93, the gamut index (Rg) of 97, and the correlated color temperature (CCT) of 3852 K. Under the excitation of laser diode (LD), the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W, color rendering index (CRI) of 90, and CCT of 5988 K. The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.

【 授权许可】

CC BY