Joint study on development of new light-emitting materials

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1.Optical properties of alkali halide crystals doubly-doped with Mn^<2+> and S^<2->(Se^<2->)When KCl crystals doped with Mn^<2+> and S^<2->(Se^<2->)were irradiated with uv light, vibronic luminescence characteristic of S_2^-(Se_2^-)molecular ions were observed at the flrstime. This type of the vibronic emission exhibits a superradiance and has a potential use into laser action.2.Laser emission from microdroplets and the application of its technique into bio-materhlsIt was found that the dye-doped spherical microdropletscontaining highly scattering Intralipid-10% show good laser action with a well-difined lasing threshold. The present method utilizing the scatterng medium could be widely applied to a large number of dyes and lasing materials.3.Basic experiments for a new typoe of up-conversion laser mediaEmission and excitation spectra for luminescence at 9K were investigated in the case of LiTaO_3 doped with Pr^<3+> or Tm^<3+> ions and SrGdGa_3aO_7 doped with Tm^<3+>. Lifetimes of the above luminescence were also studied using a short pulse of the width of less than 1ps from Ti-sapphire laser at room temperature.4.Basic study of relaxation processcs in ionic crystals using the molecular dynamics (MD) methodBy optimization of potential parameters, it became possible to simulate the movement of indivisual atoms in a real time and also to discuss the lattice relaxation and defect stability.5.Preparation of p-type CdS films and its application to a p-CdS/n-CdS homojunction device Using the p-type CdS obtained by Cu-doping, a p-Cds/n-CdS homojunction devicewas prepared. Characteristics of a solar cell were investigated for this device. Furthermore, light emission by current injection into this junction was preliminarnrily observed at the first time.