An efficient planar organic heterojunction (OHJ) consisted of 1,4,5,8,9,11-hexaazatriphenylene- hexacarbonitrile (HAT-CN)/1,1-bis [(di-4-tolyamino)phenyl)]cyclohexane (TAPC) is employed simultaneously as both charge generation layer (CGL) and charge injectors to fabricate high efficiency and long lifetime tandem organic light-emitting diodes (OLEDs). It can be seen that compared with conventional tandem OLEDs, the tandem OLEDs utilizing OHJ as both CGL and charge injectors significantly improved not only the current and quantum efficiencies, more importantly, but also the power efficiency and stability. The maximum efficiencies were as high as 42.0%, 159.5 cd A-1 and 92.7 lm W-1, and the lifetime reached 1350 h, which are more higher than the efficiencies of 34.3% 130.2 cd A-1 and 75.0 lm W-1 and the lifetime of 859 h of conventional tandem OLEDs. The more balanced charge generation and injection due to the simultaneous utilization of OHJ as CGL and charge injectors contributed to the significant improvement in the performance of resulting tandem OLEDs. These results fully indicate the validity of OHJ as CGL and charge injectors, and also provide a new route for the development of high performance OLEDs.

有效的平面有机异质结（OHJ）由1,4,5,8,9,11-六氮杂三苯撑-六碳腈（HAT-CN）/ 1,1-双[[di-4-tolyamino）苯基）]环己烷（TAPC）组成）同时用作电荷产生层（CGL）和电荷注入器，以制造高效率和长寿命的串联有机发光二极管（OLED）。可以看出，与传统的串联OLED相比，利用OHJ作为CGL和电荷注入器的串联OLED不仅显着提高了电流效率和量子效率，而且还显着提高了功率效率和稳定性。最大效率高达42.0％，159.5 cd A-1和92.7 lm W-1，寿命达到1350 h，高于34.3％130.2 cd A-1和75.0 lm W-1的效率。传统串联OLED的寿命为859小时。由于同时利用OHJ作为CGL和电荷注入器，使得电荷产生和注入更加平衡，这极大地改善了串联OLED的性能。这些结果充分表明了OHJ作为CGL和电荷注入器的有效性，也为高性能OLED的开发提供了新途径。