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Issue 42, 2017
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Engineering the excited-state properties of purely organic intramolecular and intermolecular charge transfer emitters towards high-performance fluorescent OLEDs

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Abstract

A direct comparative investigation on the electrofluorescence performances of pure-organic intramolecular charge transfer (ICT) and intermolecular charge transfer (inter-CT) materials, which have high correlation in their molecular structures, was carried out. An n-type spiro-sulfone-based acceptor (DSO2) with a sufficiently large molecular weight is developed to serve as the acceptor in both ICT and inter-CT systems. Through manipulating their excited-state properties by molecular engineering, transformation of conventional fluorescence and thermally activated delayed fluorescence (TADF) from both the inter-CT and ICT systems could be rationally modulated. Accordingly, a conventional fluorescent, non-doped, blue OLED with an external quantum efficiency (EQE) >6.0% at a luminance of 1000 cd m−2 and a low turn-on voltage (Von) of 2.76 V was obtained; maximum EQEs of 18.2% and 25.4% were achieved for the non-doped and doped sky-blue OLEDs employing an ICT emitter with a TADF character, respectively. Besides, an OLED using the inter-CT emitter could also show good device performance with an EQE of up to 10.2%. This study contributes to understanding how to develop high-performance ICT and inter-CT emitters with selective thermally activated delayed and conventional electrofluorescence through excited-state modulation.

Graphical abstract: Engineering the excited-state properties of purely organic intramolecular and intermolecular charge transfer emitters towards high-performance fluorescent OLEDs

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Publication details

The article was received on 02 Sep 2017, accepted on 29 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC04014H
Citation: J. Mater. Chem. C, 2017,5, 10991-11000
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    Engineering the excited-state properties of purely organic intramolecular and intermolecular charge transfer emitters towards high-performance fluorescent OLEDs

    D. Chen, K. Liu, X. Li, B. Li, M. Liu, X. Cai, Y. Ma, Y. Cao and S. Su, J. Mater. Chem. C, 2017, 5, 10991
    DOI: 10.1039/C7TC04014H

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