Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7839788 | Journal of Luminescence | 2018 | 39 Pages |
Abstract
The new system of [(Gd0.9Y0.1)0.9-xTb0.1Cex]AG phosphors have been successfully obtained by using a modified co-precipitation method which include the precursor synthesis and post treatment at 1300â¯Â°C. The crystal structure stabilization, morphology, PL/PLE spectra, fluorescence decay analysis and thermal property have been studied in detail. The metastable GdAG:Tb3+/Ce3+ samples could be effectively stabilized via smaller 10â¯at% Y3+ doping, which can develop a new phosphor of [(Gd0.9Y0.1)0.9-xTb0.1Cex]AG for exploring the field of the opto-functionality. The presence of Gd3+ and Tb3+ excitation bands in the PLE spectra monitoring the Ce3+ yellow emission directly provides an evidence of Gd3+âCe3+ and Tb3+âCe3+ energy transfer. The [(Gd0.9Y0.1)0.9-xTb0.1Cex]AG phosphors with good dispersion show various luminescence properties monitoring at 275â¯nm, 331â¯nm and 452â¯nm excitation, respectively. The optimized (Gd0.9Y0.1)0.89Tb0.1Ce0.01]AG phosphor has a red-shifted emission and the applicable emission intensity because of the energy transfer of Gd3+âCe3+ and Tb3+âCe3+, thus being more suitable for the application of warm-white lighting than YAG:Tb3+/Ce3+ and LuAG:Tb3+/Ce3+. The Stokes shift have been calculated through the Gaussian fitted curves of emission spectra, indicating that the doping of Ce3+ does not obviously change the splitting degree of 5d orbit. The quenching concentration was determined to be 1.0â¯at%, and the quenching mechanism was determined to be the exchange reaction between Ce3+. The temperature-dependent analysis has been performed and the results indicated that the [(Gd0.9Y0.1)0.89Tb0.1Ce0.01]AG phosphors possesses good thermal stability. The fluorescence decay analysis shows that the lifetimes of Tb3+ and Ce3+ emission decrease with the Ce3+ content increasing. The [(Gd0.9Y0.1)0.89Tb0.1Ce0.01]AG phosphors developed in this work are expected to be widely used in the lighting and optical display areas.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Wenzhi Wang, Jinkai Li, Xin Teng, Qi Chen,