Synthesis, characterization and photoluminescence properties of Tm³⁺-doped Ca₂YTaO₆ blue-emitting phosphors

¹ Xiangnan Preschool Education College, Chenzhou 423000, Hunan, P. R. China
² College of Chemistry&Biology and Environmental Engineering, Xiangnan University, Chenzhou 423043, Hunan, P. R. China
³ Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Chenzhou 423043, Hunan, P. R. China

^* Corresponding author’s e-mail: dbyqwzd@xnu.edu.cn

Abstract

A series of Ca₂YTaO₆: Tm³⁺ blue-emitting phosphors were firstly prepared by the solid-state method. The phase formations and purity of Ca₂YTaO₆: xTm³⁺ (x = 0.3%-5% mol) were verified by X-ray powder diffraction. The morphological characteristics of Ca₂YTaO₆: 0.005Tm³⁺ were detected by scanning electron microscopy (SEM). Photoluminescence properties were discussed by emission (λ_em = 460 nm) and excitation (λ_ex = 359 nm) spectra. The critical doping concentration of the products was 0.005 mol. The proposed concentration quenching mechanism in Ca₂YTaO₆ materials was the electric multipole interaction. Besides, the color coordinates (0.1408, 0.0891) of Ca₂YTaO₆: 0.005Tm³⁺ were located in blue region. The results suggested the Ca₂YTaO₆: Tm³⁺ phosphors can be promising blue-emitting components for the WLED applications.