Joint study on development of new light-emitting materials

1.用紫外光照射双掺Mn^&lt；2+&gt；和S^&lt；2-&gt；(Se^&lt；2-&gt；)的碱金属卤化物晶体，观察到S_2^-(Se_2-)分子离子的振动发光特性。2.激光微滴的激光发射及其技术在生物材料中的应用研究发现，含Intralipid-10%高散射的染料掺杂球形微滴具有良好的激光作用和良好的激光阈值。这种利用散射介质的方法可以广泛地应用于大量的染料和激光材料。3.研究了掺Pr^&lt；3+&gt；或Tm^&lt；3+&gt；和掺Tm^&lt；3+&gt；3+&gt；的LiTaO_3和掺Tm^&lt；3+&gt；用分子动力学(MD)方法研究了离子晶体中的驰豫过程。通过对势能参数的优化，可以实时模拟原子的运动，并讨论其晶格驰豫和缺陷稳定性。5.制备p型CDS薄膜及其在p-CDS/n-CDS同质结器件中的应用。对该器件的太阳电池特性进行了研究。此外，还初步观察到了电流注入该结的发光。

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.