Fizika Nizkikh Temperatur: Volume 46, Number 10 (October 2020), p. 1227-1231 ( to contents , go back )
Photoluminescence of Tl4HgI6 single crystals
A. I. Kashuba1, M. V. Solovyov2, A. V. Franiv2, B. Andriyevsky3, T. S. Malyi2, V. B. Tsyumra2,4, Ya. A. Zhydachevskyy4, H. A. Ilchuk1, and M. V. Fedula5
1Lviv Polytechnic National University, Lviv 79646, Ukraine
2Ivan Franko National University of Lviv, Lviv 79005, Ukraine
3Faculty of Electronics and Computer Sciences, Koszalin University of Technology, Koszalin 75-453, Poland
4Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland
5Khmelnytskyi National University, Khmelnytskyi 29016, Ukraine
Received June 9, 2020, published online August 21, 2020
The temperature behavior of Tl4HgI6 photoluminescence spectra is presented. The emission spectra are studied in the temperature range between 4.5 and 300 K and in the spectral range 350–650 nm. Two main emission bands at ~ 551 nm and ~ 448 nm are observed corresponding to the emissions of HgI2 and TlI impurity centers. It is assumed that the low-temperature emission band at ~ 520 nm corresponds to the recombination of the exciton. The luminescence peaks observed in emission spectra in the range between 350 and 410 nm correspond to the phonon repetitions. The excitation spectra of emission bands are measured at 4.5 K and compared with the electron density of states.
Key words: photoluminescence, emission spectra, decay curve, excitation spectra.