Temperature and excitation intensity tuned photoluminescence in Ga0.75In0.25Se crystals


Isik M., Guler I., Gasanly N.

OPTICAL MATERIALS, cilt.35, ss.414-418, 2013 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 35 Konu: 3
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.optmat.2012.09.019
  • Dergi Adı: OPTICAL MATERIALS
  • Sayfa Sayısı: ss.414-418

Özet

Photoluminescence (PL) spectra of Ga0.75In0.25Se layered single crystals have been studied in the wavelength range of 580-670 nm and temperature range of 7-59 K. Two PL emission bands centered at 613 nm (2.02 eV, A-band) and 623 nm (1.99 eV, B-band) were revealed at T = 7K. The excitation laser intensity dependence of the emission bands have been studied in the 0.06-1.40 W cm(-2) range. Radiative transitions from shallow donor levels located at E-A = 0.11 and E-B = 0.15 eV below the bottom of conduction band to single shallow acceptor level located at 0.01 eV above the valence band are suggested to be responsible for the observed A- and B-bands. A simple model was proposed to interpret the recombination processes in Ga0.75In0.25Se single crystals. (c) 2012 Elsevier B.V. All rights reserved.