Low temperature recombination luminescence of Mg3Y2Ge3O12:Tb3+

A study was conducted to examine the recombination processes in persistent phosphor Mg 3 Y 2 Ge 3 O 12 :Tb 3+ garnet at low temperatures. Photoluminescence (PL), recombination luminescence (RL), electron paramagnetic resonance (EPR), and EPR detected by PL or RL were measured. In samples with low Tb 3+ concentration, a broad PL and RL band around 400–450 nm and characteristic Tb 3+ lines were observed. However, in samples with high Tb 3+ concentration, only Tb 3+ lines were present. Both the broad-band and the line components exhibit long-lasting tunneling luminescence with hyperbolic decay. After 263 nm UV irradiation signals of intrinsic electron (F-type) and hole (V-type) trapping centres were observed in the EPR spectra. Such signals were also observed in RL-detected EPR spectra, indicating that the broad RL band at low Tb 3+ concentrations originates from tunneling recombination between these intrinsic traps. At high Tb 3+ concentrations, the RL-EPR spectrum was not observed, suggesting that intrinsic electron and Tb-related hole trapping centres probably participate in the tunneling recombination. • Mg 3 Y 2 Ge 3 O 12 :Tb 3+ exhibits UV-induced afterglow at low temperatures • Luminescence spectra consist of Tb 3+ emission lines and a broad luminescence band • Broadband afterglow originates from tunnelling recombination of F- and V-type centres