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

• 作者: Xin LIU Xinglu QIAN Peng ZHENG Xiaopu CHEN Yagang FENG Yun SHI Jun ZOU Rongjun XIE Jiang LI
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Research Article
• 页码范围: 729-740
• 页数: 12页
• 语种: 英文

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 Y3A15O12∶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 1201m/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.