Recent years there has been considerable interest in the spontaneous and Stimulated emission of ZnSe crystals

[1-3]

. We have studied the effect of ZnSe crystal quality on its blue electroluminescence

[4]

. In this paper we rcport the effect of ZnSe single crystal quality on the high density excitation luminescence.Three types of ZnSe single crystal with different starling materials were grown by sublimation in our laboratory

[4]

. These were 408

413 and 420 ZnSe single crystals with (110) surface. The starting material of 408 single crystal was ZnSe powder produced by direct synthesis from 6N-Zn and 5N-Se. The starting material of 413 and 420 single crystals was also ZnSe powder produced by sublimation once and twice from the starting material of 408 single crystal

respectively. Low resistivity crystals used in this experiment were obtained by annealing the single crystals in molten zinc at 900℃ for 80-120 hours