抄録
Photoluminescence and electrophotoluminescence of NaCl : Ag are studied by excitation of the phosphor with u.v. light of the fundamental absorption region. Enhancement of luminescence is observed, when an electric field is applied to the phosphor. The field effect appears only when the polarity of the field is made negative on the illuminated side. As to the dependence on photon energy the enhancement of luminescence sets on near the step which is believed to correspond to the threshold of the band-to-band transition. Intrinsic electroluminescence is also observed by warming NaCl : Ag crystal above 100°C. As a mechanism for the electric field effect on luminescence intensity the acceleration-collision excitation model is proposed, which makes it possible to explain most of the experimental facts.
