DISLOCATION-RELATED ABSORPTION AND PHOTOLUMINESCENCE IN DEFORMED N-ZNSE CRYSTALS

It has been found that the Y-0 line appears in photoluminescence (PL) and absorption of n-ZnSe crystals after plastic deformation. The conce pt of the dislocation exciton has been used to interpret the results. The binding energy of the dislocation exciton has been determined as 2 7 meV. It is suggested that dislocation excitons are destroyed by disl ocation charge and, therefore, the Y-0 line can be related only to unc harged or slightly charged dislocations. It has also been found that t he edge of the absorption spectra of the deformed and undeformed cryst als are significantly extended as a result of the Franz-Keldysh effect from charged dislocations. Stress birefringence has also been observe d in the deformed crystal.