Time-resolved spectroscopy of Fe3+ d-d transition in bulk ZnSe polycrystal

Abstract

We report temperature dependent time-resolved photoluminescence studies of Fe3+ in ZnSe polycrystals over 10-300 K temperature ranges fabricated by the post growth thermal diffusion technique. The d-d transitions of Fe3+ assigned to the T-4(2)(G)->(6)A(1)(S) and T-4(1)(G)->(6)A(1)(S) transitions are clearly identified at 528 and 627 nm, respectively, at 10K. The observed emission peaks in the near bandgap region are red-shifted from 439 to 463 nm as the temperature increases, resulting in a temperature coefficient of 10.21x10(-4) eV/K and Debye temperature = 336 K fitted by the Varshni equation. The radiative lifetime at 528 nm by time-resolved photoluminescence is evaluated as tau(rad) = 774 +/- 4 ps, activation energy (Delta E-a) = 717.2 cm(-1), and relaxation time rate (1/W-0)= 3.1 ps. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement