光谱学与光谱分析 |
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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 |
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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.
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Received: 2010-10-03
Accepted: 2011-01-05
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Corresponding Authors:
QIU Gui-ming
E-mail: gmqiu@stu.edu.cn
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