绿色亚单层结合磷光掺杂层的白色有机发光器件

采用10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethy l-1H,5H,11H(1)-benzopyroyran-o(6,7-8-i,j)quinolizin-11-one (C545T)作为亚单层材料,在蓝光层和红光层间引入亚单层C545T,制备了三种亚单层结构的有机发光器件,通过对各器件的电致发光谱、发光强度和发光效率的对比研究,发现可以通过改变C545T层的厚度,获得高效率的白色有机发光器件.     

Light scattering by randomly rough isotropic dielectric surfaces

Abstract

An experimental investigation of the angular distribution of the light scattered by randomly rough, two-dimensional, isotropic dielectric surfaces is presented. The surfaces, whose profiles constitute good approximations to Gaussian random processes with Gaussian correlation functions, are fabricated in a photoresist and characterized by means of a mechanical profilometer. The substrates employed in the fabrication of the samples consist of thick parallel plates of filter glass that absorb the incident light and whose refractive index is close to that of the photoresist. This allows us to approximate experimentally a situation in which the light is scattered by a randomly rough interface between two semi-infinite dielectric media, illuminated from the air side. The results display features that can be attributed to multiple scattering. In particular, significant amounts of cross-polarized scattered light, as well as an enhanced backscattering peak, were observed in the scattering measurements.     

掺杂与非掺杂相结合制备有机发光器件

采用掺杂和非掺杂方法制备了一种多层白色有机电致发光器件.DPVBi为蓝光发光层,将红光[Ir(piq)2(acac)]磷光掺杂染料掺入到母体BAlq中作为红光发光层,荧光材料QAD以亚单层的方式插入Alq3中作为绿光发光层,通过改变亚单层的厚度,得到了高效率的有机发光器件,此器件的最大电流效率可达6.1 cd/A,最大功率效率达3.1 lm/W,最大亮度达25 300 cd/m2,当电压从4V变化到14V时,色坐标从(0.45,0.55)变化到(0.47,0.37),处于黄白光区.此器件的特点在于器件的性能可以通过简单地调整QAD的厚度进行控制,避免了使用多掺杂层工艺的复杂性.