Preparation and photoluminescence properties of the Eu²⁺, Sm³⁺ co-doped Li₂SrSiO₄ phosphors

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• 作者：Lijuan Liu^a ; Panli You^a ; ^b ; Guangfu Yin^a ; ^{nic0700@scu.edu.cn} ; Xiaoming Liao^a ; Zhongbing Huang^a ; Xianchun Chen^a ; Yadong Yao^a
• 关键词：Rare earth luminescence ; Eu2+ ; Sm3+ co-doped ; Photoluminescence ; Li2SrSiO4
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：July, 2012
• 卷：12
• 期：4
• 页码：1045-1051
• 文件大小：936 K

摘要

A series of Eu²⁺ and Sm³⁺ co-doped Li₂SrSiO₄ phosphors are prepared by the high temperature solid-state reaction. The morphology, structure and spectroscopic properties of the prepared samples are characterized by scanning electron microscopy, X-ray diffraction, diffuse reflection spectra, photoluminescence spectra and electron paramagnetic resonance spectra, respectively. The effect of Sm³⁺ doping concentration on the photoluminescence intensity of the prepared samples is also investigated. The results indicate that the crystal structure of Li₂SrSiO₄ is not changed with the Eu²⁺, Sm³⁺ co-doping. The spherical-like particle size of the obtained product is about 20-30聽nm in diameter. When the Sm³⁺ concentration is 0.3聽mol%and the Eu²⁺ concentration is 0.7聽mol%, the phosphors show the maximum emission intensity, which is 50%higher than that of Eu²⁺ doped Li₂SrSiO₄. Excited at 420聽nm, the phosphor presents a single broad emission band peaking at 558聽nm, which is ascribed to the 4f⁶5d¹聽鈫捖?f⁷ transitions of Eu²⁺ and ⁴G_5/2聽鈫捖?sup>6H_5/2 and ⁴G_5/2聽鈫捖?sup>6H_7/2 transitions of Sm³⁺. The Commission International de I鈥睧clairage chromaticity coordinates of Li₂SrSiO₄:0.7聽mol%Eu²⁺, 0.3聽mol%Sm³⁺ are x聽=聽0.28, y聽=聽0.28.