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Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes

Abstract

Luminescent materials with aggregation-induced emission (AIE) property have high solid state emission, while thermally activated delayed fluorescence (TADF) materials can fully harvest singlet and triplet excitons to achieve efficient electroluminescence (EL). Herein, amalgamation of AIE and TADF property, termed as aggregation-induced emission and thermally activated delayed fluorescence (AIE-TADF), is a promising strategy to design novel admirable luminescent materials. In this paper, a new tailor-made material, DCPDAPM, is obtained based on carbazole as skeleton, 9,9-dimethyl-9,10-dihydroacridine as donor group and benzophenone as accept group. Its structure is fully characterized by elemental analysis, NMR spectroscopy and mass spectrometry. Furthermore, thermal stabilities, photophysical properties, and electrochemical properties are investigated systematically. The results show that this AIE-TADF compound exhibits good thermal stability, electrochemical stability and AIE as well as TADF properties. Ultimately, using DCPDAPM and DCPDAPM doped in CBP as light-emitting layer, the non-doped OLED (Device A) and doped OLEDs (device B, device C and device D) were fabricated and studied. Device A displays green light with a turn-on voltage of 3.2V, a maximum brightness of 123371 cd m-2, a maximum current efficiency of 26.88 cd A-1, a maximum power efficiency of 15.63 lm/w and a external quantum efficiency of 8.15%. For doped OLEDs of device B, device C and device D, Device D shows best EL performance with a turn-on voltage of 3.6V, a maximum brightness of 116100 cd m-2, a maximum current efficiency of 61.83 cd A-1, a maximum power efficiency of 40.45 lm/w and a external quantum efficiency of 19.67%. These results adequately demonstrate the practicability of combine AIE and TADF to explore new efficient emitters.

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Supplementary files

Publication details

The article was received on 30 Oct 2017, accepted on 11 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7TC04934J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes

    Y. Zhao, W. Wang, C. Gui , L. Fang, X. Zhang, S. Wang, S. Chen, H. Shi and B. Z. Tang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC04934J

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