首页 | 本学科首页   官方微博 | 高级检索  
     


Structural and optical spectroscopy of LiNbO3:Tm nanocrystals embedded in a SiO2 glass matrix
Authors:M.P.F. Graça  M. Peres  M.A. Valente  A.J. Neves  T. Monteiro
Affiliation:Physics Department (I3N), Aveiro University, Campus Universitário de Santiago, 3800-193 Aveiro, Portugal;Departamento de Física and IN-IFIMUP, Universidade do Porto, Porto, Portugal
Abstract:Transparent SiO2:Li2O:Nb2O5 glass doped with Tm3+ has been prepared by the sol–gel method, and heat-treated in air (HT) at temperatures between 500 and 800 °C. X-ray diffraction (XRD) patterns and Raman spectroscopy show SiO2 and LiNbO3 phases in samples HT above 650 °C, and a NbTmO4 phase for T > 750 °C. The XRD SEM analysis show increasing particle size and number with the increase of HT temperature. Intra-4f12 transitions due to Tm3+ ion dispersed in the matrix are observed in samples with T > 650 °C. The luminescence is dominated by the 1G4  3F4 (~650 nm), 1D2  3F3 (~780 nm), 3H4  3H6 (~800 nm), 3H5  3H6 (~1200 nm) and 3H4  3F4 (~1500 nm) transitions under resonant excitation to the ion levels.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号