Temperature dependence of luminescence behavior in Er3+/Yb3+ co-doped transparent phosphate glass ceramics

The effect of temperature on the luminescence intensity of up-conversion and near infrared in Er3+/Yb3+ co-doped phosphate glass ceramics has been investigated. Efficient green and red up-conversion luminescence and strong infrared fluorescence at 1.54 mu m wavelength are observed under excitation of 975 nm. The fluorescence intensity is changing at different temperature and the results are explained with the level transitions in Er3+/Yb3+ co-doped system. Meanwhile, the lifetime of Er3+:I-4(13/2) level corresponding to different operating temperature and pump power is also discussed, and the experimental results are fitted using multiphonon relaxation theory. (C) 2009 Elsevier B.V. All rights reserved.