期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 8, 期 3, 页码 1458-1463出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2008.366
关键词
12CaO center dot 7Al(2)O(3); photoluminescence; Raman; Er3+ ion; thermalization
Er3+-doped 12CaO center dot 7Al(2)O(3) (C12A7:Er3+) powders were prepared using the sol-gel method. X-ray diffraction, micro-Raman spectra and absorption spectra showed that C12A7:Er3+ powder had been obtained. Sharp and intense Er3+-related emission from C12A7:Er3+ powder with different Er3+ concentrations in the visible region at room temperature was investigated by analyzing the local structure of Ca atoms in C12A7, and it revealed that cation sites with low symmetry of the host were beneficial to the photoluminescence of Er3+ ions. The emission lines were attributed to two types of Er3+ centers, isolated Er3+ ions and complex centers formed by aggregation of Er3+ ions. The PL intensity might be affected by free oxygen species relative to Er3+ ions formed by charge compensation. The inverse temperature dependent luminescence from the upper level of H-2(11/2) state and that from the lower level of S-4(3/2) state implied that the thermalization or thermal equilibrium of electrons between the two closely emission states occurred.
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