Optical properties of Eu2+-doped strontium borate glasses containing F- and Li+ ions
来源期刊：JOURNAL OF RARE EARTHS2008年第4期
论文作者：HUANG Yanlin JIANG Chuanfang WANG Xigang JANG Kiwan
Key words：Eu2+; noncrystalline materials; glasses; luminescence; rare earths;
Abstract: In this experiment, strontium borate glasses were prepared using the conventional quenching method in air atmosphere. Optical absorption, photoluminescence excitation and emission spectra, X-ray excited luminescence (XEL), and luminescence decay curve of the as-prepared glasses were investigated at room temperature. The as-prepared glasses had two kinds of Eu ions, i.e., Eu2+ and Eu3+. Compared with the reported results of strontium borate glasses, Eu2+ luminescence was enhanced in the studied strontium borate glasses coprepared with F- and Li+ ions. The coexisting of Li+ or F- in the borate glasses could create more negative defect VSr″ and stabilize Eu2+ ions, which might act as donor of electrons;For the F- doping, the new center of B(O, F)4 (or BO3F) and BO2F2 units could be considered to be the distorted (BO4), which were needed as a rigid framework to stabilize the divalent rare earth ions.
HUANG Yanlin1，JIANG Chuanfang1，WANG Xigang1，JANG Kiwan2
(1.School of Material Engineering, Soochow University, Suzhou 215021, China;
2.Department of Physics, Changwon National University, Changwon 641-773, Republic of Korea)
Abstract:In this experiment, strontium borate glasses were prepared using the conventional quenching method in air atmosphere. Optical absorption, photoluminescence excitation and emission spectra, X-ray excited luminescence (XEL), and luminescence decay curve of the as-prepared glasses were investigated at room temperature. The as-prepared glasses had two kinds of Eu ions, i.e., Eu2+ and Eu3+. Compared with the reported results of strontium borate glasses, Eu2+ luminescence was enhanced in the studied strontium borate glasses coprepared with F- and Li+ ions. The coexisting of Li+ or F- in the borate glasses could create more negative defect VSr″ and stabilize Eu2+ ions, which might act as donor of electrons;For the F- doping, the new center of B(O, F)4 (or BO3F) and BO2F2 units could be considered to be the distorted (BO4), which were needed as a rigid framework to stabilize the divalent rare earth ions.
Key words:Eu2+; noncrystalline materials; glasses; luminescence; rare earths;
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