Jump to main content
Jump to site search


Engineering Excited-State Properties of Intramolecular and Intermolecular Charge Transfer Purely Organic Emitters towards High-Performance Fluorescent OLEDs

Abstract

A directly comparative investigation on the electrofluorescence performances of pure-organic intramolecular charge transfer (ICT) and intermolecular charge transfer (inter-CT) materials, which have high correlation on molecular structures, was carried out. An n-type spiro-sulfone-based acceptor (DSO2) with a sufficiently large molecular weight is developed to serve as both the acceptor in 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 fluorescence, non-doped, blue OLED with an external quantum efficiency (EQE) >6.0% at 1000 cd m-2 and a low turn-on voltage (Von) of 2.76 V was obtained; A maximum EQE 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 exhibit good device performance with an EQE up to 10.2%. This study contributes to understand how to develop high-performance ICT and inter-CT emitters with selective thermally activated delayed and conventional electrofluorescence through excited-state modulation.

Back to tab navigation

Supplementary files

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, Accepted Manuscript
  •   Request permissions

    Engineering Excited-State Properties of Intramolecular and Intermolecular Charge Transfer Purely Organic 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, Accepted Manuscript , DOI: 10.1039/C7TC04014H

Search articles by author

Spotlight

Advertisements