使用PTB7作为阳极修饰层提高有机发光二极管的性能

采用poly4,8-bis(2-ethylhexyl)oxy]benzo1,2-b:4,5-b’]dithiophene-2,6-diyl]3-?uoro-2-(2-ethylhexyl)carbonyl]thieno3,4-b]thiophenediyl]](PTB7)作为有机发光二极管器件的阳极修饰层,制备了结构为indium tin oxide(ITO)/PTB7(不同浓度)/N,N’-Bis(naphthalen-1-yl)-N,N’-bis(phenyl)benzidine(NPB,40 nm)/8-hydroxyquinoline(Alq3,60 nm)/LiF(1 nm)/Al的系列器件,同时研究了不同浓度的PTB7对器件性能的影响.PTB7的最佳浓度为0.25 mg/mL,器件性能得到明显的改善,起亮电压为4.3 V.当驱动电压为14.6 V时,最大亮度为45800 cd/m2,最大电流效率为9.1 cd/A.与没有PTB7修饰的器件相比,其起亮电压降低了1.9 V,最高亮度提升了78.5%.器件性能提高归因于PTB7的插入使得空穴注入和传输能力大大改善.

Enhanced performance of organic light-emitting diodes by using PTB7 as anode modification layer

Poly4,8-bis(2-ethylhexyl)oxy]benzo1,2-b:4,5-b’]dithiophene-2,6-diyl]3-fluoro-2-(2-ethylhexyl)carbonyl]thieno3, 4-b]thiophenediyl]] (PTB7) is used as an anode modification layer to fabricate organic light-emitting diode (OLED) with the configuration of ITO/PTB7 (with different concentrations)/NPB(40 nm)/Alq₃(60 nm)/LiF(1 nm)/Al, and the effect of PTB7 concentration on the performance of device is investigated. The best concentration of PTB7 is 0.25 mg/mL, while the best device turn-on voltage is 4.3 V. For the best device, its maximum luminance is 45800 cd/m² at a driving voltage of 14.6 V, its maximum current efficiency is 9.1 cd/A, its turn-on voltage is reduced by 1.9 V and the maximum luminance is increased by 78.5% compared with that of the device without PTB7. The improvement of its performance is ascribed to the fact that the hole injection and transport ability are improved by the layer of PTB7.