Highly efficient orange–red electroluminescence enabled by fluorenone-based thermally activated delayed fluorescent emitter

Kailong Wu; Tao Zhang; Lisi Zhan; Zian Wang; Cheng Zhong; Shaolong Gong; Zheng-Hong Lu; Chuluo Yang

doi:10.1117/1.JPE.8.032107

2 March 2018 Highly efficient orange–red electroluminescence enabled by fluorenone-based thermally activated delayed fluorescent emitter

Kailong Wu, Tao Zhang, Lisi Zhan, Zian Wang, Cheng Zhong, Shaolong Gong, Zheng-Hong Lu, Chuluo Yang

Author Affiliations +

Journal of Photonics for Energy, Vol. 8, Issue 3, 032107 (March 2018). https://doi.org/10.1117/1.JPE.8.032107

Abstract

A butterfly shaped orange–red thermally activated delayed fluorescent (TADF) emitter, named ACFO, is developed by integrating electron-donating (D) 9,9-dimethyl-9,10-dihydroacridine units into γ-positions of an electron-accepting (A) fluorenone core to form a D-A-D configuration. ACFO emits intense orange–red light peaking at 600 nm in toluene solution, which is significantly red-shifted compared with its benzophenone-based counterpart. Imparted with a small singlet–triplet splitting energy of 0.13 eV, ACFO exhibits distinct TADF feature with a short delayed fluorescent lifetime of 3.8 μs and displays a moderate photoluminescence quantum yield of 31%. Consequently, employing ACFO as an emitter results in orange–red organic light-emitting diodes that exhibit a maximum external quantum efficiency of nearly 11%, corresponding to a nearly 100% exciton utilization efficiency in electroluminescence process. Our finding demonstrates for the first time that fluorenone derivatives can be employed as TADF emitters for high-efficiency fluorescent organic light-emitting diodes.

Citation Download Citation

Kailong Wu, Tao Zhang, Lisi Zhan, Zian Wang, Cheng Zhong, Shaolong Gong, Zheng-Hong Lu, and Chuluo Yang "Highly efficient orange–red electroluminescence enabled by fluorenone-based thermally activated delayed fluorescent emitter," Journal of Photonics for Energy 8(3), 032107 (2 March 2018). https://doi.org/10.1117/1.JPE.8.032107

Received: 2 November 2017; Accepted: 8 February 2018; Published: 2 March 2018

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