Joint study on development of new light-emitting materials

1. Mn^（2+）和S^（Se^）双掺碱金属卤化物晶体的光学性质当Mn ^（<2-><2->2+）和S^<2->（Se^<2->）双掺KCl晶体在紫外光照射下，首先观察到S_2^-（Se_2^-）分子离子的电子振动发光特性。2.微滴的激光发射及其技术在生物材料中的应用研究发现，含有10%高散射Intrasonid的染料掺杂球形微滴具有良好的激光作用，并具有很好的激光阈值。研究了掺Pr ^3+、Tm^3+的LiTaO_3和掺Tm^3+的SrGdGa_3aO_7在9 K温度下的发光光谱和激发光谱。在室温下，用钛宝石激光器产生的脉宽小于1 ps的短脉冲研究了上述发光的寿命。4.用分子动力学方法研究了离子晶体弛豫过程的基础。这使得在真实的时间内模拟单个原子的运动成为可能，并且还讨论了晶格弛豫和缺陷稳定性。p型CdS薄膜及其在p-CdS/n-CdS同质结器件中的应用利用Cu掺杂得到的p型CdS，制备了p-CdS/n-CdS同质结器件。研究了该器件的太阳能电池特性。此外，首次在该结中观察到电流注入发光。

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.