Cathodoluminescence study of europium-doped zirconia and cassiterite powders
Cathodoluminescence study of europium-doped zirconia and cassiterite powders
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掺铕氧化锆和锡石粉末的阴极发光研究
DOI：
10.1016/s0022-3697(97)00141-8
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发表时间：
1998
影响因子：
4
通讯作者：
F. Wasgestian
中科院分区：
文献类型：
--
作者：
S. Gutzov;M. Bredol;F. Wasgestian
本文研究了经不同热处理后的ZrO_2：Eu ~（3+）和SnO_2：Eu ~（3+）粉末的阴极发光光谱。通过4-15 kV激发在400和750 nm之间测量的Eu 3+的室温阴极发光光谱的变化表明，延长的热处理（24 h/950 °C）导致在两个系统中形成非中心对称的Eu 3+位点。在ZrO 2：Eu 3+系统中检测到两种光谱类型，分别用于在相对较低和较高温度下加热的样品。这些观察定性地解释了在热处理下晶体生长过程中形成的不同构型的氧空位。定量阴极射线发光测量表明，在热处理过程中与颗粒团聚的粉末的发光效率的增加。
The cathodoluminescence spectra of ZrO2:Eu3+powders of average crystallite size 15–35 nm and SnO2:Eu3+powders of crystallite size 40–50 nm, obtained after different heat treatments, were studied. The change in the room-temperature cathodoluminescence spectra of Eu3+, measured between 400 and 750 nm by 4–15 kV excitation, showed that prolonged heat treatment (24 h/950 °C) leads to the formation of non-centrosymmetric Eu3+sites in both systems. In the ZrO2:Eu3+systems two spectrum types were detected, for samples heated at relatively low and high temperatures, respectively. These observations are explained qualitatively by the formation of different configurations of oxygen vacancies in the process of crystal growth under heat treatment. Quantitative cathodoluminescence measurements show an increase of the luminous efficiency of the powders which is connected with particle agglomeration during heat treatment.