Jump to main content
Jump to site search

Issue 37, 2018
Previous Article Next Article

Thermally activated delayed fluorescence sensitizer for D–A–A type emitters with orange-red light emission

Author affiliations

Abstract

Red thermally activated delayed fluorescence (TADF) emitters with high efficiency still remain a difficulty in the field of organic light-emitting diodes (OLEDs). The key issue lies in the contradiction between red-shifting emission spectra and retaining high photoluminescence quantum yields (PLQYs). To tackle this problem, TADF-assisted fluorescent OLEDs (TAF-OLEDs) are one promising method. In this work, two charge-transfer (CT) fluorescent emitters were developed based on the D–A–A design strategy (TPA-BT-CN and ACR-BT-CN). By increasing the rigidity of the donor moiety, ACR-BT-CN shows a higher PLQY (over 80%) than that of TPA-BT-CN (∼70%). Within expectation, when utilizing TPA-BT-CN as end emitters and 4CzIPN as the sensitizer, a high EQE of approximately 10% is achieved for 0.5 wt% and 1.0 wt% based devices. Benefiting from the increased rigidity, a superior EQE of around 16% with an emission peak at 595 nm is also achieved. Furthermore, suppressed efficiency roll-off is also observed for these low-doping devices.

Graphical abstract: Thermally activated delayed fluorescence sensitizer for D–A–A type emitters with orange-red light emission

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Jul 2018, accepted on 22 Aug 2018 and first published on 23 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC03287D
J. Mater. Chem. C, 2018,6, 10030-10035

  •   Request permissions

    Thermally activated delayed fluorescence sensitizer for D–A–A type emitters with orange-red light emission

    Y. Wang, C. Huang, S. Kumar, S. Li, Z. Dong, M. Fung, Z. Jiang and L. Liao, J. Mater. Chem. C, 2018, 6, 10030
    DOI: 10.1039/C8TC03287D

Search articles by author

Spotlight

Advertisements