2162-8769/2014/3(6)/R100/4/$31.00 © The Electrochemical Society Photoluminescence Properties and Energy-Level Analysis of Ga2O3:Tb3+ Green Phosphor Prepared by Metal Organic Deposition

We synthesize Ga2O3:Tb3+ green phosphor by metal-organic deposition and report the photoluminescence (PL) properties of this phosphor. The X-ray diffraction analysis indicates that only β-phase Ga2O3:Tb3+ can be synthesized by calcination at Tc = 700◦C. The Tb3+-related green emission intensity shows an increase with increasing molar ratio M = Tb/Ga and a saturation at M ∼ 0.005 − 0.03, followed by the concentration quenching at M> 0.03. The decreased luminescence decay time caused by the concentration quenching is clearly observed at M> 0.03. The green emission intensity exhibits a gradual decrease with increasing temperature above ∼300 K, yielding quenching energies of 0.25 and 0.63 eV. The detailed energy-level scheme of Tb3+ ions in β-Ga2O3 is obtained from the PL and PL excitation spectra of this phosphor