Preparation and photoluminescence properties of the Eu<sup>2+sup>, Sm<sup>3+sup> co-doped Li<sub>2sub>SrSiO<sub>4sub> phosphors
- 作者：Lijuan Liu<sup>asup> ; Panli You<sup>asup><sup> ; sup><sup>bsup> ; Guangfu Yin<sup>asup><sup> ; sup><sup>nic0700@scu.edu.cnsup> ; Xiaoming Liao<sup>asup> ; Zhongbing Huang<sup>asup> ; Xianchun Chen<sup>asup> ; Yadong Yao<sup>asup>
- 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 Eu<sup>2+sup> and Sm<sup>3+sup> co-doped Li<sub>2sub>SrSiO<sub>4sub> 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 Sm<sup>3+sup> doping concentration on the photoluminescence intensity of the prepared samples is also investigated. The results indicate that the crystal structure of Li<sub>2sub>SrSiO<sub>4sub> is not changed with the Eu<sup>2+sup>, Sm<sup>3+sup> co-doping. The spherical-like particle size of the obtained product is about 20-30聽nm in diameter. When the Sm<sup>3+sup> concentration is 0.3聽mol%and the Eu<sup>2+sup> concentration is 0.7聽mol%, the phosphors show the maximum emission intensity, which is 50%higher than that of Eu<sup>2+sup> doped Li<sub>2sub>SrSiO<sub>4sub>. Excited at 420聽nm, the phosphor presents a single broad emission band peaking at 558聽nm, which is ascribed to the 4f<sup>6sup>5d<sup>1sup>聽鈫捖?f<sup>7sup> transitions of Eu<sup>2+sup> and <sup>4sup>G<sub>5/2sub>聽鈫捖?sup>6sup>H<sub>5/2sub> and <sup>4sup>G<sub>5/2sub>聽鈫捖?sup>6sup>H<sub>7/2sub> transitions of Sm<sup>3+sup>. The Commission International de I鈥睧clairage chromaticity coordinates of Li<sub>2sub>SrSiO<sub>4sub>:0.7聽mol%Eu<sup>2+sup>, 0.3聽mol%Sm<sup>3+sup> are x聽=聽0.28, y聽=聽0.28.