Balance the Carrier Mobility To Achieve High Performance Exciplex OLED Using a Triazine-Based Acceptor

ACS Applied Materials & Interfaces
Wen-Yi HungKen-Tsung Wong

Abstract

A star-shaped 1,3,5-triazine/cyano hybrid molecule CN-T2T was designed and synthesized as a new electron acceptor for efficient exciplex-based OLED emitter by mixing with a suitable electron donor (Tris-PCz). The CN-T2T/Tris-PCz exciplex emission shows a high ΦPL of 0.53 and a small ΔET-S = -0.59 kcal/mol, affording intrinsically efficient fluorescence and highly efficient exciton up-conversion. The large energy level offsets between Tris-PCz and CN-T2T and the balanced hole and electron mobility of Tris-PCz and CN-T2T, respectively, ensuring sufficient carrier density accumulated in the interface for efficient generation of exciplex excitons. Employing a facile device structure composed as ITO/4% ReO3:Tris-PCz (60 nm)/Tris-PCz (15 nm)/Tris-PCz:CN-T2T(1:1) (25 nm)/CN-T2T (50 nm)/Liq (0.5 nm)/Al (100 nm), in which the electron-hole capture is efficient without additional carrier injection barrier from donor (or acceptor) molecule and carriers mobilities are balanced in the emitting layer, leads to a highly efficient green exciplex OLED with external quantum efficiency (EQE) of 11.9%. The obtained EQE is 18% higher than that of a comparison device using an exciplex exhibiting a comparable ΦPL (0.50), in which TCTA shows similar e...Continue Reading

References

Aug 31, 2012·Journal of the American Chemical Society·Qisheng ZhangChihaya Adachi
Dec 14, 2012·Nature·Hiroki UoyamaChihaya Adachi
Jul 16, 2013·ACS Applied Materials & Interfaces·Wen-Yi HungKen-Tsung Wong
Jun 4, 2014·Advanced Materials·Jin Won SunJang-Joo Kim
Jun 5, 2014·Scientific Reports·Wen-Yi HungPi-Tai Chou
Sep 29, 2015·Nature Materials·P B DeotareM A Baldo

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Citations

Jan 25, 2017·Chemical Society Reviews·Zhiyong YangMatthew P Aldred
Feb 6, 2017·ACS Applied Materials & Interfaces·Wen-Yi HungKen-Tsung Wong
Jun 20, 2020·Beilstein Journal of Organic Chemistry·Rasa KeruckieneJuozas V Grazulevicius
Dec 3, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Guang-Zhao LuYou-Xuan Zheng
Mar 20, 2020·Research : a Science Partner Journal·Xuejun ZhanZhen Li
Jul 22, 2017·ACS Applied Materials & Interfaces·Xiaoyu HuangShuming Chen
Jun 28, 2018·Journal of Chemical Information and Modeling·Shao-Yu LuPaul M Zimmerman
Jan 18, 2018·ACS Applied Materials & Interfaces·Yi-Sheng LaiYen-Hsun Su
May 15, 2019·The Journal of Physical Chemistry Letters·Baoyan LiangYue Wang
Aug 28, 2020·ACS Applied Materials & Interfaces·Alexander M PolgarZachary M Hudson
Apr 4, 2018·ACS Applied Materials & Interfaces·Monima Sarma, Ken-Tsung Wong

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