Preliminary results on the photoluminescence and optically stimulated luminescence in Cu-doped and Ag-doped ZnB X (B = Li, Na, K: X = Cl, Br) compounds.

Photoluminescence, and optically stimulated luminescence in ZnB X (B; Li,Na,K: X; Cl,Br) compounds doped with Cu or Ag were studied. Double humped emission bands attributable to the activators were observed in all the samples. The observed photoluminescence of Cu and Ag could be identified with 3d 4s ↔3d and 4d 5s ↔5d transitions respectively. The longer wavelength band (400-500 nm range) could be attributed to the Cu or Ag ion replacing alkali ion at the octahedral alkali site whereas short wavelength band (340-400 nm range) is attributed to a Cu or Ag ion at tetrahedral zinc site. The short wavelength band was found to be intense compared with long wavelength and gave an indication that most of the Cu or Ag ions prefered a tetrahedral Zn site compared with the octahedral alkali site. All the samples exhibit optically stimulated luminescence (OSL). The sensitivity was found to be lattice dependent. The lowest sensitivity of about 1% compared with Al O :C was observed in lithium lattices whereas highest the sensitivity of about 290% was observed in the case of Cu-doped ZnNa Br .