抄録
Cubic zinc seleno-sulfide phosphors activated by Cu, Mn, Pb or Bi were prepared and their infra-red spectral-responsivity as well as the spectral distribution of luminescence were investigated. Bi-activated phosphors showed no conspicuous response for infra-red irradia-tion, but Mn- or Pb-activated phosphors showed remarkable stimulation and Cu-activated phosphors stimulation and quenching.
Starting with cubic ZnS phosphor and adding increasing proportion of ZnSe, the stimula-tion or quenching bands about 0.8μ and 1.3μ increase their broadening at 2_??_3% ZnSe. The latter band vanishes at 5_??_10% ZnSe and the former one at about 30% ZnSe. The quenching band at about 0.8μ of Cu-activated ZnS phosphor is converted to stimulation band by the addition of about 10% ZnSe.
From the above experimental results, a simple model explaining the photo-stimulation and -quenching of these zinc seleno-sulfide phosphors is proposed.
