Simultaneous Enhancement of Efficiency and Stability of Phosphorescent OLEDs Based on Efficient Förster Energy Transfer from Interface Exciplex

ACS Applied Materials & Interfaces
Dongdong ZhangLian Duan

Abstract

Exciplex forming cohosts have been widely adopted in phosphorescent organic light-emitting diodes (PHOLEDs), achieving high efficiency with low roll-off and low driving voltage. However, the influence of the exciplex-forming hosts on the lifetimes of the devices, which is one of the essential characteristics, remains unclear. Here, we compare the influence of the bulk exciplex and interface exciplex on the performances of the devices, demonstrating highly efficient orange PHOLEDs with long lifetime at low dopant concentration by efficient Förster energy transfer from the interface exciplex. A bipolar host, (3'-(4,6-diphenyl-1,3,5-triazin-2-yl)-(1,1'-biphenyl)-3-yl)-9-carbazole (CzTrz), was adopted to combine with a donor molecule, tris(4-(9H-carbazol-9-yl)phenyl)amine (TCTA), to form exciplex. Devices with energy transfer from the interface exciplex achieve lifetime almost 2 orders of magnitude higher than the ones based on bulk exciplex as the host by avoiding the formation of the donor excited states. Moreover, a highest EQE of 27% was obtained at the dopant concentration as low as 3 wt % for a device with interface exciplex, which is favorable for reducing the cost of fabrication. We believe that our work may shed light on f...Continue Reading

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Citations

Jan 25, 2017·Chemical Society Reviews·Zhiyong YangMatthew P Aldred
Oct 2, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Qunying MeiBihai Tong
Dec 12, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Minghan CaiLian Duan
Jan 31, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yukiko IwasakiTakahisa Shimizu
Aug 17, 2019·Chemical Society Reviews·Babak PashaeiFrancesco Bonaccorso
May 13, 2017·Scientific Reports·Hirohiko FukagawaToshihiro Yamamoto
May 28, 2019·Frontiers in Chemistry·Baohua Zhang, Zhiyuan Xie
Sep 22, 2017·ACS Applied Materials & Interfaces·Yu-Tang TsaiDario M Bassani
Dec 22, 2017·ACS Applied Materials & Interfaces·Chun-Jen ShihKen-Tsung Wong
Nov 2, 2018·ACS Applied Materials & Interfaces·Marco ColellaAndrew P Monkman
Apr 4, 2018·ACS Applied Materials & Interfaces·Monima Sarma, Ken-Tsung Wong
Jul 7, 2020·ACS Applied Materials & Interfaces·Tao ZhangRussell J Holmes

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