Abstract
Bi3+,Eu3+ co-doped Ca3LiZnV3O12 (CLZV) phosphors were manufactured by conventional high-temperature solid-state reaction technique to explore their application for solid-state lighting. Their crystal structure, luminescent properties, energy transfer processes and quantum efficiency were investigated in detailed. CLZV host can be efficiently excited by 345 nm near-ultraviolet light and exhibit self-activating blue emission. When Bi3+ ions are introduced into CLZV, VO43− and Bi3+ can be co-excited by 345 nm light. Benefiting from energy transfer from VO43− to Eu3+ and Bi3+ to Eu3+, multi-color tuning emission from green to yellow can be observed in CLZV:Bi3+,Eu3+ phosphors. Warm white emission was achieved in CLZV:0.015Bi3+,0.01Eu3+ and CLZV:0.015Bi3+,0.02Eu3+ phosphors. Importantly, their internal quantum efficiencies are 35.2 % and 39.6 %, respectively. Our results indicate that CLZV: Bi3+,Eu3+ phosphors might be promising candidates for white light emitting diodes under ultraviolet excitation.
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