Abstract
Photoluminescence, excitation and pulse cathode luminescence spectra, and decay kinetics of lithium hafnate Li2HfO3 were investigated at temperatures 300 and 7.5K. Time-resolved luminescence spectra were excited with synchrotron radiation in UV–VUV range. Strong emission with the peak position at 4.42eV and with the decay time in μs range was revealed at T=7.5K. The emission was attributed to radiative decay of self-trapped excitons (STE). The features observed in the excitation spectra at 6.6eV were likely to take place because of the exciton formation, with inter-band transitions dominating at 6.7eV. Crystal structure defects underpin the luminescence spectra formation at room temperature in the frame of vacancy model.
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