期刊
CERAMICS INTERNATIONAL
卷 49, 期 3, 页码 5431-5436出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.10.066
关键词
Phosphor; C; Optical properties; D; Silicate; A; Powders; solid state reaction
This study reports a blue-emitting phosphor Na2MgSiO4:Ce3+ where Ce3+ occupies the Na+ sites, showing tunable emission color characteristics. The relationship between crystal structure and luminescent properties was studied through structural refinement and in-depth luminescent studies. The phosphor with proper Ce3+ content exhibited a high absolute quantum efficiency of 86.0% and acceptable thermal stability. The pc-wLED made of 365 nm UV chip, Na2MgSiO4:Ce3+,Li+, and commercial green and red phosphors showed good performance with a color rendering index of 93.3.
Phosphor-converted white light-emitting diodes (pc-wLEDs) based on near-UV LED chip demand efficient blue -emitting phosphors, because the pc-wLED uses either multi phosphors or single-phase white-emitting phosphor both needs blue-emitting component. When using Ce3+ as the activator, the host structure usually has rare earth ions or alkaline earth ion such as Ca2+ for Ce3+ to occupy, due to similar ionic radius and charge. This work is going to report a blue-emitting phosphor Na2MgSiO4:Ce3+, where Ce3+ occupies the Na+ sites. The phosphor exhibits characteristic of tunable emission color upon increasing Ce3+ content or introducing Li+ as charge compensator. The relationship between the crystal structure and the luminescent properties was studied in detail based on structural refinement and in-depth luminescent studies. The phosphor with a proper Ce3+ content showed a high absolute quantum efficiency of 86.0% and acceptable thermal stability. The pc-wLED made of 365 nm UV chip, the as-prepared Na2MgSiO4:Ce3+,Li+, and commercial green and red phosphors showed good performance with color rendering index of 93.3.
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