EVIDENCE OF DISTANThyphen;PAIR RECOMBINATION PROCESSES IN THE GREENhyphen;EDGE EMISSION OF CdS AT 4.2deg; AND 77deg;K

摘要

The luminescence of single crystals of wurtizite CdS having a strong greenhyphen;edge emission was studied at 4.2deg; and 77deg;K as a function of exciting intensity of steady 3650hyphen;Aring; light. The typical overlapping band structure of the greenhyphen;edge emission, a zero phonon band with sim;300 cmminus;1phonon replica bands, was seen to shift to longer wavelengths with decreasing intensity of the exciting light. This behavior, seen in the green edge of GaP, suggests that the green edge arises from the recombination of electrons and holes trapped on distant donor and acceptor pairs.