Cathodoluminescent in heavily-doped ZnSe

The present cathodoluminescent investigation of ZnSe single crystals used samples grown by closed-tube thermal diffusion technique. The crystals used had gone through three different stages of treatments. The as-grown ZnSe was doped with 8×10¹⁸ cm^-3 iodine concentration during growth, and the as-grown sample received zinc extraction treatment, and that subsequently diffused with Zn-In impurity of 7×10¹⁸ cm^-3 indium concentration. The yellow-orange light with a broad band peaking at 2.01 eV was observed in all the samples, and was contributed as the self-activated luminescent center due to the deep donor state formed from the host crystal cation surrounding the activator, while the activator perturbs the cation to form this state. A configuration coordinate model, together with a quantum-mechanical vibration model analysis indicated and confirmed the temperature shift of the luminescent peak and the temperature dependency of the half-width of the main band