Preparation and Luminescent Properties of a Green Ca2SnO4∶Tb3+ Phosphor
QIU Gui-ming1, XU Cheng-ke2, HUANG Chong1
1. College of Science, Shantou University, Shantou 515063, China 2. Department Physics & Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
Abstract：A novel green emitting phosphor, Tb3+-doped Ca2SnO4, was prepared by the solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the formation of Ca2SnO4∶Tb3+. Photoluminescence measurements indicated that the phosphor exhibits bright green emission at about 543 nm under UV excitation. The excitation spectra of Ca2-xTbxSnO4 appear to have a red shift with main peak from 254 to 260 nm. The emission spectra of Ca2-xTbxSnO4 have four peaks ascribed to 5D4—7FJ (where J=6, 5, 4, 3) transitions of Tb3+ ions. Under the condition of low Tb3+ concentration, the 5D4—7F6 transition of Tb3+ showed a stark energy level split to three split peaks and the peak intensity of 481nm firstly increased with increasing Tb3+ concentration, then decreased. The dependence of luminescent intensity of Ca2SnO4∶Tb3+ phosphor on the Tb3+ concentration was studied, and the results show that the luminescence intensity firstly increased with increasing Tb3+ concentration, then decreased, and reached the maximal value at 9 mol% Tb3+. According to the Dexter theory, the authors confirmed the concentration quenching mechanism of Tb3+ in Ca2SnO4. The fluorescence lifetime of phosphor analysis shows that the average lifetime is 4.4 ms. The results indicated that Ca2SnO4∶Tb3+ could be a potential candidate as a green-emitting powder phosphor.
[1] YANG Xiu-jian, SHI Chao-shu, XU Xiao-liang(杨秀健, 施朝淑, 许小亮). Acta Phys. Sin.(物理学报), 2002, 51(12): 2871. [2] XIN Xian-shuan, ZHOU Bai-bin, Lü Shu-chen, et al(辛显双, 周百斌, 吕树臣, 等). Acta Phys. Sin.(物理学报), 2005, 54(4): 1859. [3] Danielson E, Devenney M, Giaquinta D M, et al. J. Science, 1998, 279(6): 837. [4] Danielson E, Devenney M, Giaquinta D M, et al. J. Mol. Structure, 1998, 470: 229. [5] CHUAI Xiao-hong, ZHANG Hong-jie, LI Fu-shen, et al(揣晓红, 张洪杰, 李福燊, 等). Chin. J. Inorg. Chem.(无机化学学报), 2003, 19(5); 462. [6] Nag A, Narayanan Kutty T R. J. Mater. Chem., 2003, 13: 370. [7] SHI Shi-kao, WANG Ji-ye, LI Jun-min, et al(石士考, 王继业, 栗俊敏, 等). Journal of the Chinese Rare Earth Society(中国稀土学报), 2004, 22(6): 859. [8] Yang Hongmei, Shi Jianxin, Gong Menglian, et al. Journal of Solid State Chemistry, 2005, 178: 917. [9] FU Shi-liu, YIN Tao, CHAI Fei(符史流，尹 涛，柴 飞). Chinese Physics(中国物理), 2007, 16: 3129. [10] FU Shi-liu，CHAI Fei, ZHOU Tao，et al(符史流，柴 飞，周 涛，等). Chinese Journal of Inorganic Chemistry(无机化学学报), 2009, 25(1): 76. [11] ZHANG Si-yun(张思远). Spectroscopy of Rare-Earth Ions(稀土离子的光谱学). Beijing: Science Press(北京：科学出版社), 2008. 235. [12] Shi J S, Zhang S Y. J. Phys. Chem. B, 2004, 108: 18845. [13] Gruber J B, Nash K L, et al. Journal of Luminescence, 2008, 128: 1271. [14] QU Guang-yuan, DONG Ning, GUO Hai, et al(曲广媛，董 宁，郭 海，等). Chin. J. Lumin.(发光学报), 2005, 26(2): 199. [15] Dexter D L, Schulman J H. J. Chem. Phys., 1954, 22(6): 1063. [16] WANG Zhi-jun, LI Pan-lai, WANG Ying, et al(王志军，李盼来，王 颖，等). Acta Physcia Sinica(物理学报), 2009, 58(12): 1257. [17] WANG Wen-yun, YU Jiao-lu, YU Ying-ning, et al(王文韵，于皎路，于英宁，等). Laser Journal(激光杂志), 1993, 14(3): 127.
