Photo- and radioluminescence of lithium hafnate Li 2HfO 3
- Baklanova, Ya. V.
- Ishchenko, A. V.
- Denisova, T. A.
- Maksimova, L. G.
- Shulgin, B. V.
- Pustovarov, V. A.
- Viktorov, L. V.
- Пустоваров, В. А.
DOIAbstract
Photoluminescence, excitation and pulse cathode luminescence spectra, and decay kinetics of lithium hafnate Li 2HfO 3 were investigated at temperatures 300 and 7.5 K. Time-resolved luminescence spectra were excited with synchrotron radiation in UV-VUV range. Strong emission with the peak position at 4.42 eV and with the decay time in μs range was revealed at T = 7.5 K. The emission was attributed to radiative decay of self-trapped excitons (STE). The features observed in the excitation spectra at 6.6 eV were likely to take place because of the exciton formation, with inter-band transitions dominating at 6.7 eV. Crystal structure defects underpin the luminescence spectra formation at room temperature in the frame of vacancy model. © 2012 Els...
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