溶胶-凝胶法制备发光薄膜现状

发光薄膜在对比度、分辨率、热传导、均匀性、与基底的附着性、释气速率等方面都显示出较强的优越性,在平板显示领域具有很好的应用背景。本文结合我们的工作综述了通过溶胶－凝胶工艺制备发光薄膜的基本过程、薄膜的表征方法、发光薄膜的当前发展及应用情况。依据组成特点,溶胶－凝胶法制备的发光薄膜可分为无机发光薄膜和有机／无机杂化发光薄膜,它们的光致发光、阴极射线发光、场发射发光和电致发光等性质都已被广泛研究。我们除了采用硅酸酯为主要原料制备了一些硅酸盐基发光薄膜外,还以无机盐为主要原料通过Pechini溶胶－凝胶法制备了稀土离子掺杂的钒酸盐发生薄膜,并结合毛细管微模板技术实现了发光薄膜的图案化。最后,我们对未来溶胶－凝胶法制备发光薄膜的发展及应用情况进行了展望。

State of the Art: Luminescent Films Prepared by Sol-gel Process

Luminescent films have found extensive applications in flat panel display devices, which have advantages such as higher contrast and resolution, better thermal stability, superior thermal conductivity, a high degree of uniformity and better adhesion to the substrate as well as a reduced outgassing rate. In this paper, based on our research owrk, a review has been given on the basic processes, characterization methods, and current development and application situation for luminescent films fabricated by sol-gel method. Classified by compositions, the sol-gel derived luminescent films include inorganic luminescent films and organic/inorganic hybrid luminescent films, whose photoluminescent, cathodoluminescent, electroluminescent and field emission properties have been widely studied. Besides the silicate phosphor films which mainly employed alkoxysilanes as the main precursors for sol-gel transition, we also prepared other important phosphor films such as vanadates doped with rare earth ions by Pechini sol-gel process using inorganic salts as precursors, and realized the patterning of the phosphor films by soft lithography( micro-molding in capillaries). Finally, the future development tendency for the luminescent films are forecasted.