Synthesis and Photoluminescence Properties of Sc_0.88-xLu_0.05VO₄:Eu³⁺_0.07,Bi³⁺_x Red Phosphor

Abstract:

Sc_0.88-xLu_0.05VO₄:Eu³⁺_0.07,Bi³⁺_x(0≤x≤0.05) red phosphors were synthesized by solid state reaction at 1200°C for 3h. The structure, morphology and luminescence spectra of samples are investigated by X-ray diffraction (XRD), Scanning electron microscope (SEM) and fluorescence spectrophotometer, respectively. The samples doped with Eu³⁺, Lu³⁺ and Bi³⁺ maintain the body-centered tetragonal structure of ScVO₄ and the morphology remains essentially unchanged with slight agglomeration. The excitation spectrum of Sc_0.88-xLu_0.05VO₄:Eu³⁺_0.07,Bi³⁺_x emerged redshift and the excitation intensity increase within the near UV excitation (360-400nm). The optimum doping concentration of Bi³⁺ is 0.02(x value), and the maximum emission intensity of Sc_0.86Lu_0.05VO₄:Eu³⁺_0.07,Bi³⁺_0.02 is higher than 88 % in comparison with Sc_0.88Lu_0.05VO₄:Eu³⁺_0.07 under 365 nm excitation. Decay curve of ⁵D₀ state for as-prepared samples fits the single order exponential behavior, the lifetime of ⁵D₀ increase first and then decrease with the increase of Bi³⁺ doping concentration. The internal quantum efficiency is up to 74.08% under 365nm excitation; When the temperature raises to 200°C, the emission intensity maintains 79% of that in the room temperature. Sc_0.86Lu_0.05VO₄:Eu³⁺_0.07,Bi³⁺_0.02 phosphor show high internal quantum efficiency and thermal stability, which is suitable for the UV-pumped white LED as red phosphor.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 604-611
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.604
• Online since: January 2017
• Authors: Di Wu*, Xin Yu Ye, Xin Hua Yang, Jian Zhou, Xiao Qiang Wen, Shi Yong Xie, Yang Luo
• Keywords: Luminescence, Red Phosphor, Solid State Reaction, White LED

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