PVK:NPB复合空穴传输层对有机电致发光器件的影响

采用poly(N-vinylearbazole)(PVK):N,N'-bis-(1-naphthyl)-N,N'-bipheny-1,1'-biphenyl-4,4'-diamine(NPB)掺杂体系作为复合空穴传输层,通过调节该体系的组分,制备了结构为indium-tin oxide(ITO)/PVK:NPB/8-hydroxyquinoline aluminum(Alq3)/Mg:Ag的双层有机电致发光器件(OLED),研究了具有不同掺杂质量比的OLED器件的电致发光特性,并对掺杂薄膜的表面形貌进行了表征.结果表明,将NPB掺杂到PVK中会提高空穴传输能力,改善器件的发光亮度和效率,并调节载流子复合区域的位置,光谱谱峰从509 nm移动到530 mm;但随着NPB质量比例提高,掺杂薄膜表面的平均粗糙度由3 nm上升为10 mm,电流密度和亮度先升高后降低.当PVK和NPB的掺杂质量比为l:3时,器件具有最优性能,发光亮度达到7852 cd/m2,功率效率为1.75 lm/W.

Influence of PVK:NPB hole transporting layer on organic light-emitting devices characteristics

Organic light-emitting devices(OLEDs)with a structure of indium-tin oxide(ITO)/poly(N-vinylcarbazole)(PVK):N,N'-bis-(1-naphthyl)-N,N'-biphenyl-1,1'-biphenyl-4,4'-diamine(NPB)/8-hydroxyquinoline aluminum(Alq3)/Mg:Ag are fabricated.A doping system consisting of small-molecular hole transporting material NPB and polymer material PVK is employed as the composite hole transporting layer(CHTL).By adjusting the component ratio of doping system,a series of devices with different concentration proportion of PVK:NPB ...