Visible upconversion in rare earth ion-doped Gd2O3 nanocrystals
Visible upconversion in rare earth ion-doped Gd2O3 nanocrystals
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DOI：
10.1021/jp048072q
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发表时间：
2004-12-16
影响因子：
3.3
通讯作者：
Xia, SD
中科院分区：
文献类型：
--
作者：
Guo, H;Dong, N;Xia, SD
采用简单的溶胶-凝胶法制备了稀土离子（Tm 3+，Er 3+，Yb 3+）掺杂的立方Gd 2 O3陶瓷。通过拉曼光谱和红外光谱分析了样品的振动特性。在980 nm激光激发下，Gd 2 O3：Tm+Yb和Gd 2 O3：Er（Gd 2 O3：Er+Yb）分别记录到蓝色（488 nm）、绿色（564 nm）和红色（661 nm）上转换。在Gd_2 O_3：Er+Yb中，Er ~（3+）的红光发射大大增强，绿色发射减弱。研究了上转换发光的激光功率和掺杂浓度依赖性，以了解上转换机制。激发吸收和能量转移过程中讨论的可见光发射的可能机制。
Rare earth ions (Tm3+, Er3+, and Yb3+)-doped cubic Gd2O3 nanocrystal were prepared by a simple sol-gel method. Raman and FT-IR spectra were measured to evaluate the vibrational feature of the samples. Under 980 nm laser excitation, blue (488 nm), green (564 nm), and red (661 nm) upconversion has been recorded in Gd2O3:Tm+Yb and Gd2O3:Er (Gd2O3:Er+Yb), respectively. A great enhancement of red emission and diminishment of green emission of Er3+ in Gd2O3:Er+Yb have been observed. Laser power and doping concentration dependence of the upconverted emissions were studied to understand the upconversion mechanisms. Excited absorption and energy-transfer processes are discussed as the possible mechanisms for the visible emissions.