Preparation and luminescence properties of Tm³⁺-doped SrBi₂Ta₂O₉ blue-emitting phosphor

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: dengbinxnu@163.com

Abstract

Various novel SrBi₂Ta₂O₉:Tm³⁺ blue-emitting materials were achieved via solid-state synthesis. The structure and phase purity of prepared SrBi₂Ta₂O₉:xTm³⁺ (x = 0.005-0.30 mol) were examined by X-ray powder diffraction. The surface morphology of SrBi₂Ta₂O₉:0.01Tm³⁺ were studied by scanning electron microscopy. Photoluminescence properties were systematically explored under the monitoring emission (λem = 468 nm) and excitation (λex = 303 nm) spectra. The optimum mole ratio of as-synthesized phosphors was 0.01 mol. The concentration quenching mechanism in the SrBi₂Ta₂O₉ host was due to electric multipole interaction. Particularly, the chromaticity coordinates (0.1334, 0.0474) of SrBi₂Ta₂O₉:0.01Tm³⁺ are near to those of the commercial BaMgAl₁₀O₁₇:Eu²⁺. These results validated the SrBi₂Ta₂O₉:Tm³⁺ phosphor can be utilized good blue-emitting candidate for W-LEDs.