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Thermal annealing of LaF3:Eu3+ nanocrystals synthesized by a solvothermal method and their luminescence properties
Authors:Bin Zhu  Nan Chen  Denghua Zhu  Yangsheng Li  Wei Sun  Guihua Liu  Guoping Du
Institution:1. School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, People’s Republic of China
Abstract:In this work, we used a low temperature solvothermal method to synthesize Eu3+-doped LaF3 (LaF3:Eu3+) nanocrystals. The effect of thermal annealing on their phase structures and luminescence properties was studied. Transformation from LaF3 to LaOF was observed after the annealing, and the initial transformation process was studied using a rapid thermal annealing technique. It was found that a sufficiently high annealing temperature is required for the transformation of LaF3 to LaOF. LaOF phase started to be formed after annealing at 500 °C for as short as 5 min, and higher annealing temperatures and longer annealing time led to a larger amount of LaOF formed. With the increase of the formation of LaOF, the luminescence was greatly enhanced. Strong O2? → Eu3+ charge transfer band was present in these samples annealed at 500 °C and higher temperatures, and greatly enhanced 7F0 → 5D2 transition of Eu3+ was also observed.
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