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Research Article | Open Access

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

Xin LIUa,b,Xinglu QIANc,Peng ZHENGdXiaopu CHENa,bYagang FENGa,bYun SHIa,bJun ZOUc,e( )Rongjun XIEd( )Jiang LIa,b( )
Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
School of Science, Shanghai Institute of Technology, Shanghai 201418, China
College of Materials, Xiamen University, Xiamen 361005, China
Institute of New Materials & Industrial Technology, Wenzhou University, Wenzhou 325024, China

Xin Liu and Xinglu Qian contributed equally to this work.

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Abstract

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.

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Journal of Advanced Ceramics
Pages 729-740
Cite this article:
LIU X, QIAN X, ZHENG P, et al. Composition and structure design of three-layered composite phosphors for high color rendering chip-on-board light-emitting diode devices. Journal of Advanced Ceramics, 2021, 10(4): 729-740. https://doi.org/10.1007/s40145-021-0467-0

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Received: 24 December 2020
Revised: 30 January 2021
Accepted: 23 February 2021
Published: 05 August 2021
© The Author(s) 2021

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