THE METALORGANIC CHEMICAL-VAPOR-DEPOSITION AND PHOTOLUMINESCENCE OF TELLURIUM-DOPED ZNS CDS-TE STRAINED-LAYER SUPERLATTICES/

Tellurium (Te) exciton traps have been doped into the wells of ZnS/CdS :Te superlattices to investigate the potential for achieving enhanced blue emission intensities at room temperature. Exciton trapping and co rresponding blue emission was confirmed from photoluminescence studies , however, the emission was found to quench above about 200 K, which i s probably attributable to dislocation formation in highly strained la yers when large ions such as Te are incorporated. Comparison of the em ission linewidths with that of bulk CdS:Te show that the nature of ele ctron-phonon coupling to the Te centres changes in the superlattice st ructures compared to bulk material.