Luminescence study and Judd-Ofelt analysis of Nd3+ doped lithium lanthanum borate glass for green laser device

Lithium lanthanum borated glasses doped with Nd3+ (LiLaBNd) were synthesized to study in luminescence properties and laser potential. Refractive index, density and molar volume of glass increase with increasing of Nd3+ concentration. Glasses absorb photon in visible light and near- infrared region corresponding to energy transition from I-4(9/2) ground state of Nd3+. Covalent nature and interaction between Nd3+ and ligand result to small red shift of Nd3+ energy level. The strongest emission with 1059 nm corresponds to F-4(3/2)-> I-4(11/2) transition of Nd3+ under 808 nm excitation. The optimum concentration of Nd2O3 for this glass is 0.50 mol% which creates the maximum intensity of emission. Luminescence decay curve indicated cross relaxation process between Nd3+ with low probability and life time value as 114 microsecond for 0.50 mol% doped glass. Judd-Ofelt analysis was used to evaluate several radiative parameters. Narrow effective bandwidth, high stimulated emission cross section and branching ratio indicated the advantage potential to develop LiLaBNd glass for using as laser medium in green emitting laser device. (C) 2017 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of SACT 2016.