场致发光中的混合激发研究

Inorganic electroluminescent material for blue light emission is prepared. We obtained the analytical formula of OEL intensity under the condition of mutual restriction of injection and body effect. The site of emission in double-layered electroluminescence material is analysed. The heterojunction from organic and inorganic materials is prepared. The primary property (electron transport) of inorganic semiconductors is successfully used for improvement of luminescence intensity. Then we used the secondary properties (electron multiplication and acceleration ) of semiconductors for the same purpose, and discovered solid state cathodoluminescence. The newly appeared blue emission and long wavelength luminescence are studied. We carried out the cross proof of the existence of solid state cathodoluminescence by means of device with unsymmetric structure. We obtained the mixed luminescence from the recombination of the resultant electron current and resultant hole current. This mixed luminescence may lead to enhancement of lntensity and efficiency of recombination luminescence. From the organic/inorganic heterojunction we discovered the superposition of two different mechanisms of lectroluminescence. We analyed the factors influencing the improvement of luminescent characteristics under this frame.

利用混合激发及分层优化方案，优化每层的电学及光学性质，使场致发光成为增强碰撞激发为主及类阴极射线激发的叠加，有机及无机复合的场致发光成为注入发光为主，与碰撞激发为固体中的类阴极射线发光为主，其它场致发光为辅的发光叠加。充分发挥EL，OEL及FED的各自优势，以提高亮度。