Effects of Mo on phase structure and up-conversion emissions of Er:Al_2O_3 nanocrystals  

作　　者：LIU Dan CONG Yan 

机构地区：[1]School of Physics and Materials Engineering Dalian Nationalities University, Dalian 116600, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第8期1417-1421,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11004021);the Fundamental Research Funds for the Central Universities (Grant Nos. DC12010117 and DC120101174)

摘　　要：A simple and efficient approach was presented to enhance up-conversion emissions significantly for the Er：Al2O3 nanocrystals by Mo support （Er-Mo：Al2O3） with a 976 nm laser diode excitation. Mo support had evident effects on the phase structure and up-conversion emissions for the Er：Al2O3 nanocrystals, which promoted the θ-（Al,Er）2O3 transformed to α-（Al,Er,Mo）203 phase, Compared with the Er：Al2O3, the maximal green and red up-conversion emissions intensities increased about 3×10^3 and 1.4×10^2 times for the Er-Mo：Al2O3 nanocrystals, respectively. It suggests that the enhancement of up-conversion emissions is caused by the high excited state energy transfer process from [4115/2, 3T2） state of the Er3＋-MoO2- dimer to the 4F7/2 level of E3＋.A simple and efficient approach was presented to enhance up-conversion emissions significantly for the Er:Al2O3 nanocrystals by Mo support (Er-Mo:Al2O3) with a 976 nm laser diode excitation. Mo support had evident effects on the phase structure and up-conversion emissions for the Er:Al2O3 nanocrystals, which promoted the -(Al,Er)2O3 transformed to -(Al,Er,Mo)2O3 phase. Compared with the Er:Al2O3, the maximal green and red up-conversion emissions intensities increased about 3×103 and 1.4×102 times for the Er-Mo:Al2O3 nanocrystals, respectively. It suggests that the enhancement of up-conversion emissions is caused by the high excited state energy transfer process from |4I15/2, 3T2> state of the Er3+-MoO42 dimer to the 4F7/2 level of Er3+.

关 键 词：Er doped Al2O3 up-conversion emissions Mo support sol-gel method 

分 类 号：TN244[电子电信—物理电子学] TB383[一般工业技术—材料科学与工程]