Rare earth;
UC luminescence;
Energy transfer;
ENERGY-TRANSFER;
MECHANISMS;
TB3+;
D O I:
10.1016/j.ssc.2010.03.004
中图分类号:
O469 [凝聚态物理学];
学科分类号:
070205 ;
摘要:
The influence of Eu3+ on the upconversion (UC) fluorescence of Er3+ in Y2O3:Er3+, Yb3+ nanocrystals was investigated. Room-temperature UC spectra show that the intensity ratio of red to green lights was increased from 8.6 to 19.3 with 1.0 mol% Eu3+ doping. Additionally, with the increase of Eu3+ ion concentration, the n values for both green and red UC emissions in Y2O3:Er3+, Yb3+ nanocrystals become larger. Our analysis shows that the energy transfer between Eu3+ and Er3+ ions is the main cause for the enhancement of H-2(11/2), S-4(3/2) -> F-4(9/2) and I-4(11/2) -> I-4(3/2) transitions of Er3+ ions. (C) 2010 Elsevier Ltd. All rights reserved.