High-purity ZnS x Se 1- x (0 x 0.15) single crystals have been grown by the sublimation method. Sharp emission due to free-exciton (Ex) has been observed for the first time in ZnS x Se 1- x . The bound-exciton (I 2 and I 1 deep ) line and the LO-phonon replicas of I 1 deep line have also been observed. Energies of their peaks shift towards higher energy with the increase of composition parameter x (0 x 0.15). With increasing x , the I 1 deep emission line becomes broader and approaches a Gaussian shape. The intensity of I 1 deep line decreases with increasing x and becomes hardly observable for x above 0.12.
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Huang et al. (1983) studied this question.
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