Color-Tunable Single-Phase Bi3+/Eu3+-Activated LiCa3ZnV3O12 Luminescence Materials Based on Energy Transfer

To achieve high-quality WLED (White light emitting diodes) lighting, it is essential to accurately control the emission color of phosphor materials. The LiCa3ZnV3O12 : Bi3+/Eu3+ phosphors were synthesized by a traditional high-temperature sintering reaction and characterized using XRD, SEM, Fluorescence Spectrophotometer. This paper firstly reported the luminescence properties of Bi3+ single-doped garnet phosphors LiCa3ZnV3O12. Based on local lattice distortion and the energy transfer of VO43--> Bi3+, the luminescence color of LiCa3ZnV3O12 : Bi3+ could be adjusted from blue-green (490 nm) to yellow-green (517 nm) under NUV excitation. In addition, Bi3+-> Eu3+ energy transfer was designed by Bi3+ and Eu3+ double doping, and full color emission tuning from blue to blue-green and then to pink and white was successfully realized. The energy transfer mechanism, luminescence chromaticity coordinates and thermal stability are studied in detail. More significantly, by constructing efficient energy transfer between Eu3+ and Bi3+, the thermal stability of as-synthesized samples are gradually improved. This paper proposes a new direction for the color tuning of phosphors through multiple energy transfers and local lattice distortion.