无机电致发光的新进展及机理分析

主要介绍了分层优化结构、蓝源成彩技术(color-by-blue)及无机薄膜电致发光中的一些物理问题。在分层优化结构中采用了极性材料SiO2作为电子加速层,可以将过热电子的最大能量提到10 eV左右,增加了可以激发发光中心的过热电子数目,是提高无机薄膜电致发光效率的唯一的方法。蓝源成彩技术(color-by-blue) 是两种激发方式的混合——电致发光和光致发光,利用BaAl2S4:Eu材料中获得的高亮度(900 cd／m2)的蓝色电致发光激发绿色及红色光致发光材料,获得了色纯度非常高的三基色发光,实现了无机彩色电致发光。目前以蓝源成彩技术为基础的17英寸彩色电视机样机已经问世,这种电视机的最大亮度可以到600 cd／cm2,对比度达到 1000:1。

New Developments and Analysis on Mechanism of Inorganic Electroluminescence

The layered optimization scheme and color-by-blue technology are introduced, some physical problems about inorganic electroluminescence are discussed. In the LOS, the polar material SiO2 is used as electron-accelerated layer; the maximal energy of hot electrons may achieve 10 eV. But the energy of hot electron has a great distribution due to the influence of crystal lattice. The color-by-blue technology developed by Ifire Company is the blend of two kinds of luminescence, electroluminescence and photoluminescence. The high brightness full-color EL didn't appear until recently because the blue phosphor for EL has not been developed. Defect free 17 in. VGA CBB show better characteristics, a high peak luminance of 600 cd/cm2 and a high contrast ratio of 1000:1.