BCP层对蓝光有机电致发光器件效率的影响

Effect of BCP layer on organic light-emitting devices performance

采用真空热沉积的方法,在常规的三层器件基础上,通过改变空穴阻挡层BCP的厚度,制备了具有结构为氧化铟锡(ITO)/N,N′-diphenyl-N,N′-bis(1-naphthyl)(1,1′-biphenyl)-4,4′-diamine(NPB)/2,9-dimethyl-4,7-di-phenyl-1,10-phenanthroline(BCP)/Hydroxyquinoline aluminum(Alq3)/Mg:Ag的双异质结的有机电致发光器件。结果表明,当空穴阻挡层BCP的厚度从0.1nm逐渐增加到4.0nm时,器件的电致发光光谱实现了从绿色到蓝绿色再到蓝色发射的转变。同时,空穴阻挡层BCP起到了调节载流子复合区域和改变器件发光颜色的作用,并且通过详细的器件结构优化证明一定厚度的BCP层显著地提高了蓝光器件的效率,达到了7.3lm/W。

Based on conventional two-layer devices,double heterostructure three-layer organic light emitting diodes（OLEDs） with a structure of indium-tin oxide（ITO）/N,N′-diphenyl-N,N′-bis （1-naphthyl） （1 ,1′-biphenyl）-4,4′-diamine（NPB）/2, 9-dimethyl-4,7-diphenyl-1,10-phenan throline （BCP）/8-Hydroxyquinoline aluminum（Alq3 ）/Mg：Ag have been fabricated by vacuum deposition method. The inlquence of different film thickness of the BCP layer on the performance of OLEOs has been investigated. The results show that when the thickness of the BCP layer gradually ranges from 0.1 nm to 4.0 urn,the electroluminescence spectra of the OLEDs shift from green to greenish-blue to blue,and the BCP layer acres as the role of the recombination region of charge carders as welt as EL spectrum. Also,the brightness and power efficiency are enhanced, and the power efficiency reaches 7.3 lm/W.