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Chinese Journal of Organic Chemistry >

2019 , Vol. 39 >Issue 12: 3460 - 3466

DOI: https://doi.org/10.6023/cjoc201906019

Design and Synthesis of Novel Red Thermally Activated Delayed Fluorescent Molecule Based on Acenaphtho[1,2-b]quinoxaline Electron-Acceptor

  • Yu Jia ,
  • Xiao Yafang ,
  • Chen Jiaxiong
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  • a Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123;
    b Department of Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong

Received date: 2019-06-17

  Revised date: 2019-07-22

  Online published: 2019-08-30

Supported by

Project supported by the China Postdoctoral Science Foundation (No. 2018M640517).

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Abstract

A new thermally activated delayed fluorescence (TADF) acceptor (A) segment, acenaphtho[1,2-b]quinoxaline (AQ) group, is designed. And a novel red TADF material 10,10',10''-(acenaphtho[1,2-b]quinoxaline-3,9,10-triyl)tris(10H-phenoxazine) (AQ-TPXZ) is developed by the conjunction of AQ group with phenoxazine as donor (D) moieties. The density functional theory calculation shows that this D-A molecule has a well separation between the highest occupied molecular orbital and the lowest unoccupied molecular orbital. And the energy splitting between the lowest singlet state and the lowest triplet state is calculated to be 0.02 eV. The transient photoluminescence decays of AQ-TPXZ doped 4,4'-di(9H-carbazol-9-yl)-1,1'-biphenyl film exhibit double-component emission decay profiles. The organic light-emitting diode (OLED) using AQ-TPXZ as dopant realizes red emission with a peak at 624 nm. Moreover, the device obtains maximum external quantum efficiency (EQE) up to 7.4%, which is higher than the theoretical maximum EQE (5%) of traditional fluorescent OLEDs. This result not only indicates that AQ-TPXZ is a red TADF material but also provides a newly electron acceptor segment for designing novel red TADF emitters.

Key words： thermally activated delayed fluorescent; acenaphtho[1,2-b]quinoxaline; phenoxazine; red emitter; organic light-emitting diode

Cite this article

Yu Jia , Xiao Yafang , Chen Jiaxiong . Design and Synthesis of Novel Red Thermally Activated Delayed Fluorescent Molecule Based on Acenaphtho[1,2-b]quinoxaline Electron-Acceptor[J]. Chinese Journal of Organic Chemistry, 2019 , 39(12) : 3460 -3466 . DOI: 10.6023/cjoc201906019

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