Abstract
Abstract Radiative recombination in hexagonal ZnSe has been investigated at 4·2°K and 77°k. Emission due to bound exciton complexes, electrons or holes trapped in shallow centres and deep centres has been observed. Three types of bound exciton complexes having dissociation energies of 0·0029 ev, 0·0057 ev and 0·0098 ev have been found, and these are assigned tentatively as due to txcitons bound to neutral donors, ionized acceptors and neutral acceptors, respectively. Shallow centres with ionization energies of 0·0138 ev and 0·118 ev have also been found. The former is a donor state and the latter an acceptor state. Two intense luminescence bands involving deep centres have been observed with peak energies at 2·40 ev and 2·02 ev. The luminescence spectra of hexagonal ZnSe have been changed to those of the cubic form by heavy Mn ion bombardment. This effect may be related to the local rearrangement of the lattice. Various phonon energies of hexagonal ZnSe have been obtained. These have been assigned as: LO phonon.- 00318 ev; TO phonon: 0·0·256 ev; LA phonon: 0·0098 ev and TA phonon: 0·0064 ev.
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