Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Realizing 20% external quantum efficiency in electroluminescence with efficient thermally activated delayed fluorescence from an exciplex.

Chapran, Marian and Pander, Piotr Henryk and Vasylieva, Marharyta and Wiosna-Sałyga, Gabriela and Ulanski, Jacek and Dias, Fernando B. and Data, Przemyslaw (2019) 'Realizing 20% external quantum efficiency in electroluminescence with efficient thermally activated delayed fluorescence from an exciplex.', ACS applied materials & interfaces., 11 (14). pp. 13460-13471.

Abstract

Herein we report the investigation of non-doped exciplex formed in blends of 2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), working as the one-electron acceptor molecule, with different electron donors. The emission of these exciplexes spans from blue to orange-red, and shows clear contribution from thermally activated delayed fluorescence (TADF). We focus our studies on the properties of TADF in these systems, covering the physical meaning of the different transient components observed in the luminescence decays of these blends. Our results unravel the intricate role of reverse intersystem crossing due to spin-orbit coupling and hyperfine interactions and internal conversion, which affect the efficiency of the TADF mechanism. Organic light-emitting diodes fabricated with these blends show in some cases remarkable performances. Green exciplex blends, in particular, exhibited the current efficiency of 60 cd A-1, power efficiency of 71 lm W-1 and external quantum efficiency of 20%. We believe our results will contribute significantly to highlight the potential advantages of intermolecular exciplexes in the area of organic light-emitting diodes.

Item Type:Article
Full text:Publisher-imposed embargo until 13 March 2020.
(AM) Accepted Manuscript
First Live Deposit - 21 March 2019
File format - PDF
(1279Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acsami.8b18284
Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.8b18284
Record Created:20 Mar 2019 16:58
Last Modified:10 Apr 2019 11:04

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitterExport: EndNote, Zotero | BibTex
Look up in GoogleScholar | Find in a UK Library