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Multiplasmon radiation line replicas of bound excitons in single ZnSe crystals

A. KLYUKANOV1,* , C. SUSHKEVICI1, M. CHYUKICHEV2, A. AWAWDEH1, V. GURAU1, A. CATANOI1

Affiliation

  1. State University of Moldova, Mateevici 60, Chisinau, 2009 Moldova
  2. Moscow M. Lomonosov State University, Moscow, 119899 Russia

Abstract

The cathode-luminescence of ZnSe single crystals, grown from vapour phase and heat treated in Bi melts [ZnSe(Bi)] at 1200 K for 120h, and also in Bi melts doped by Al [ZnSe(Bi, Al)] were investigated at 4.2 K. The LO-phonon replicas of free excitons emission line dominate in cathode-luminescence spectra of the samples heat treated in Bi followed by water quenching. The lines of bound excitons series, nLO I ds − , 1 , were observed in the emission of all samples, including the original ones. It was found that plasmon replicas are not proper only for nLO Is−1 lines, but, also, for nLO Id− 1 lines. The weak exciton-plasmon coupling is manifested in one plasmon Stokes side band shoulders of nLO Id− 1 lines. It is developed the theory of bound excitons multi-quantum optical transitions with participation of mixed plasmon-phonon oscillation modes. This theory allows for the calculation of the emission spectra form–function, without using any model. The theoretical spectra are in agreement with the experimental data..

Keywords

Cathodo-luminescence, ZnSe single crystal, Bound exciton lines, Multi-quantum optical transition.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

A. KLYUKANOV, C. SUSHKEVICI, M. CHYUKICHEV, A. AWAWDEH, V. GURAU, A. CATANOI, Multiplasmon radiation line replicas of bound excitons in single ZnSe crystals, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 123-127 (2006)