IRRADIATION-INDUCED LUMINESCENCE ENHANCEMENT EFFECT OF ZNS-MN2-FILMS(NANOPARTICLES IN POLYMER)

The effects of irradiation-induced luminescence enhancement by ZnS:Mn2 + nanoparticles in poly(vinyl butyral) films are reported. The lumines cence intensity increases several times when fresh samples are irradia ted by a 248-nm excimer laser. The decay time also increases with expo sure time. The increase in the initial intensity of the slow component of luminescence makes the main contribution to the enhancement effect . A tentative model is proposed in which the efficiency of the energy transfer to Mn2+ ions increases with exposure. States at interfaces ar e expected to play an important role in this process. (C) 1997 Optical Society of America.