Interfacial TADF Exciplex as a Tool to Localize Excitons, Improve Efficiency, and Increase OLED Lifetime
Interfacial TADF Exciplex as a Tool to Localize Excitons, Improve Efficiency, and Increase OLED Lifetime
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DOI：
10.1021/acsami.8b15942
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发表时间：
2018-11-21
影响因子：
9.5
通讯作者：
Monkman, Andrew P.
中科院分区：
文献类型：
--
作者：
Colella, Marco;Pander, Piotr;Monkman, Andrew P.
在本工作中，我们使用在发光层（EML）主体26 DCzPPy和电子传输层（ETL）2，4，6-三[3-（二苯基膦基）苯基]-1，3，5-三嗪之间在EML和ETL之间的界面处形成的热激活延迟荧光（TADF）激基复合物，以提高基于Ir（dmpq）（2）acac的磷光有机发光二极管的稳定性和效率。我们表明，TADF激基复合物在EML-ETL接口的存在下诱导的重组区，这是局限于5 nm厚的EML的有效本地化。此外，TADF激基复合物允许收集在EML-ETL界面处堆积的空穴和电子，并通过Forster和/或Dexter能量转移将所得激发态能量转移到磷光发射体。这种方法有效地提高了器件的LT 90，
In this work, we employ a thermally activated delayed fluorescence (TADF) exciplex formed between the emissive layer (EML) host, 26DCzPPy, and the electron transport layer (ETL) 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine at the interface between the EML and the ETL to improve the stability and efficiency of a phosphorescence organic light-emitting diode based on Ir(dmpq)(2)acac. We show that the presence of the TADF exciplex at the EML-ETL interface induces an efficient localization of the recombination zone, which is confined within the 5 nm thick EML. Furthermore, the TADF exciplex allows harvesting of the holes and electrons that piled up at the EML-ETL interface and transfers the resultant excited state energy to the phosphorescent emitter through Forster and/or Dexter energy transfer. This approach effectively improves the LT90 of devices from