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INFRARED LUMINESCENCE OF GOLD-DOPED ZnSe CRYSTALS

A. N. Avdonin1, G. N. Ivanova1, G. V. Kolibaba1, D. D. Nedeoglo1, N. D. Nedeoglo1,* , V. P. Sirkeli1

Affiliation

  1. Department of Physics, State University of Moldova, A. Mateevich str., 60, MD-2009 Kishinev, Moldova

Abstract

Long-wave photoluminescence (PL) spectra of n-ZnSe single crystals doped with Au in different concentrations are studied in the temperature range from 81 to 300 K. A narrow band of infrared (IR) radiation centred at 878 nm manifests itself in the low-temperature PL spectrum. The intensity of this band first increases and then decreases with increasing concentration of doping impurity. The nature of the luminescence centre, its structure and the mechanism of radiative recombination are discussed on the ground of complex investigation of luminescence properties of ZnSe:Zn:Au crystals. It is shown that the observed IR radiation is caused by recombination of free electrons with holes localised on associative acceptors, which contain native defects VZn and impurity defects Aui. It is established that gold is a chemically amphoteric impurity in ZnSe crystals and forms both donor (Aui) and acceptor (AuZn) centres..

Keywords

Luminescence, Zinc selenide, Amphoteric impurity.

Submitted at: Aug. 18, 2004
Accepted at: March 23, 2005

Citation

A. N. Avdonin, G. N. Ivanova, G. V. Kolibaba, D. D. Nedeoglo, N. D. Nedeoglo, V. P. Sirkeli, INFRARED LUMINESCENCE OF GOLD-DOPED ZnSe CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 837-840 (2005)