Composition dependent frequency upconversion of Er3+/Yb3+-codoped lead chloride tellurite glasses

摘要

The green and red upconversion luminescence of Er3+ in lead chloride tellurite glasses excited at 980nm is investigated. Three intense emission bands centered at 530, 545, and 658 nm corresponding to the transitions S-4(3/2) --> I-4(15/2) H-2(11/2) --> I-4(15/2) and F-4(9/2) --> I-4(15/2), respectively, were simultaneously observed at room temperature. With increasing PbCl2 content, the intensity of green (530 nm) emissions increase slightly, while the green (545 nm) and red (658 nm) emissions increase significantly. The results indicate that PbCl2 has more influence on the green (545 nm) and red (658 nm) emissions than the green (530 run) emission. The dependence of upconversion intensities on excitation power and possible upconversion mechanisms are discussed and evaluated. (C) 2004 Elsevier Inc. All rights reserved.