高效溶液法制备延迟荧光电致发光器件研究

本文以2-对-N,N-二苯基氨基-苯基]-S-二氧硫杂蒽酮(TXO-TPA)为发光材料, 4,4',4"-三(9-咔唑基)三苯胺(TCTA) 为主体材料, 通过溶液法与真空蒸镀相结合的工艺,制备了高效延迟荧光型电致发光器件。为了考察不同电子传输材料对器件性能的影响,分别选取TmPyPB、TPBI、BCP、Alq₃作为电子传输层制备器件,并对器件的性能进行系统的研究。结果表明:由于1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯(TPBI)具有合适的HOMO/LUMO能级、高的电子迁移率以及高的三重态能级,利于电子的传输和激子的阻挡,以其为电子传输层的器件显示出最佳的性能,器件的开启电压低至3.6 V,电流效率达到16.2 cd/A,最大的EQE达到5.97%。

High Efficiency Thermally Activated Delayed Fluorescence Devices Based on Solution-processed

Solution processed thermally activated delayed fluorescence (TADF) light-emitting diodes have been fabricated with a yellow TADF material TXO-TPA as the guest and TCTA as the host, by combining the spin-coating method and vaccum deposition method in the device fabrication process. With the purpose of investigating the effect of electron-transporting material on device performance, we selected electron-transporting material from TmPyPB, TPBI,BCP and Alq₃. By optimizing the device structure, high efficiency yellow TADF OLEDs by using TPBI as the electron-transporting material have been achieved. The excellent performance of TPBI can be attributed to its suitable HOMO/LUMO energy level, a high electron mobility and triplet energy level which favors electron transporting and triplet exciton blocking.The device using TPBI as an electron transporting material exhibited excellent performance with low drive voltage of 3.6 V, maximum current efficiency of 16.2 cd/A, EQE of 5.97%.