Growth of Zinc Sulfo-Selenide Single Crystals and Their Near Band-Edge Photoluminescence

Abstract
High-purity ZnS x Se1-x (0\leqslantx\leqslant0.15) 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 Se1-x . The bound-exciton (I2 and I1 deep) line and the LO-phonon replicas of I1 deep line have also been observed. Energies of their peaks shift towards higher energy with the increase of composition parameter x (0\leqslantx\leqslant0.15). With increasing x, the I1 deep emission line becomes broader and approaches a Gaussian shape. The intensity of I1 deep line decreases with increasing x and becomes hardly observable for x above 0.12.

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