基于新型腈类染料的白色有机电致发光器件的光谱特性

将腈类黄色荧光染料(2Z,2’Z)-3, 3’-(1,4-phenylene)bis(2-phenylacrylonitrile) (BPhAN)掺杂到poly(N-vinylcarbazole) (PVK)中作发光层，2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)作电子传输层和空穴阻挡层，制备了结构为Indium-tin oxide (ITO)/PVK∶BPhAN/BCP/Mg∶Ag的双层有机电致发光器件。通过调节BPhAN掺杂质量百分比(2 wt%, 4 wt%, 6 wt%)，测试了器件在不同电压下的光谱特性，研究了Frster能量转移和直接载流子俘获在发光过程中的作用。结果表明，当掺杂浓度为4 wt%时可实现色度较好的白光，随着电压从6 V增大到16 V，CIE色坐标从(0.33, 0.37)变化到(0.32, 0.33)，在白光区域有微小蓝移，这是由于随着电压的增大，能量转移效率和直接载流子俘获效率都降低，BPhAN黄光减弱，PVK发射的蓝光增强。

Spectral Characteristics of White Organic Light-Emitting Devices Based on a Novel Nitrile Fluorescence Dye

A white organic light-emitting device with a blend polymeric emissive system consisting of a novel nitrile fluorescence(2Z,2'Z)-3,3'-(1,4-phenylene)bis(2-phenylacrylonitrile)(BPhAN) as dopant and poly(N-vinylcarbazole)(PVK) as host was fabricated.2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP) was introduced into bilayer device as an electron transporting layer(HTL) and a hole blocking layer(HBL),respectively.By adjusting the doping ratio of BPhAN,a series of devices with different concentration proporti...