Time-resolved luminescence study of CaF2:Eu2+ nanocrystals in glass-ceramics
Time-resolved luminescence study of CaF2:Eu2+ nanocrystals in glass-ceramics
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DOI：
10.1016/j.jlumin.2004.09.017
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发表时间：
2005-04-01
影响因子：
3.6
通讯作者：
Fu, J
中科院分区：
文献类型：
--
作者：
Itoh, M;Sakurai, T;Fu, J
在T-g = 630℃以上加热45SiO(2)-20Al(2)O(3)-10CaO-25CaF(2)-0.1Eu(2)O(3)玻璃制备了CaF2:EU2+纳米晶体。根据加热温度和保温时间的不同，在微晶玻璃中生长的晶体尺寸为5-35nm。在Nd:YAG激光三次谐波激发下，在77 K和300 K下测量了Eu2+离子的时间分辨发光光谱。发现在延迟时间tau(D) = 0 μ s时，微晶玻璃的主能带峰值为2.97eV，相对于CaF2:Eu2+单晶的主能带能量偏移了0.04eV。当τ (D)增加到9 μ s时，在2.7 eV左右的玻璃和玻璃陶瓷中都观察到一个新的带。在此基础上，讨论了微晶玻璃中纳米CaF2:Eu2+晶体的形成过程和发光特性。(c) 2004 Elsevier B.V.版权所有
CaF2:EU2+ nanocrystals are prepared by heating 45SiO(2)-20Al(2)O(3)-10CaO-25CaF(2)-0.1Eu(2)O(3) glasses above T-g = 630 degrees C. The size of grown crystals in glass-ceramics appears to be 5-35nm from XRD and TEM measurements, depending on the heating temperature and holding time. Time-resolved luminescence spectra due to Eu2+ ions are measured at 77 and 300 K under the excitation with the third harmonics of a Nd:YAG laser. It is found that the main band peaking at 2.97eV in glass-ceramics at delay time tau(D) = 0 mu s is high-energy shifted by 0.04eV relative to that of CaF2:Eu2+ single crystals. When tau(D) increases to 9 mu s, a new band is observed at around 2.7 eV in both glass and glass-ceramics. On the basis of the present results, the formation process and luminescence properties of nanosized CaF2:Eu2+ crystals in glass-ceramics are discussed. (c) 2004 Elsevier B.V. All rights reserved.