What Controls the Orientation of TADF Emitters?
OLEDs
TADF
emitter orientation
emitter-host interaction
molecular orientation
Journal
Frontiers in chemistry
ISSN: 2296-2646
Titre abrégé: Front Chem
Pays: Switzerland
ID NLM: 101627988
Informations de publication
Date de publication:
2020
2020
Historique:
received:
10
06
2020
accepted:
21
07
2020
entrez:
26
10
2020
pubmed:
27
10
2020
medline:
27
10
2020
Statut:
epublish
Résumé
Thermally-activated delayed fluorescence (TADF) emitters-just like phosphorescent ones-can in principle allow for 100% internal quantum efficiency of organic light-emitting diodes (OLEDs), because the initially formed electron-hole pairs in the non-emissive triplet state can be efficiently converted into emissive singlets by reverse intersystem crossing. However, as compared to phosphorescent emitter complexes with their bulky-often close to spherical-molecular structures, TADF emitters offer the advantage to align them such that their optical transition dipole moments (TDMs) lie preferentially in the film plane. In this report, we address the question which factors control the orientation of TADF emitters. Specifically, we discuss how guest-host interactions may be used to influence this parameter and propose an interplay of different factors being responsible. We infer that emitter orientation is mainly governed by the molecular shape of the TADF molecule itself and by the physical properties of the host-foremost, its glass transition temperature T
Identifiants
pubmed: 33102430
doi: 10.3389/fchem.2020.00750
pmc: PMC7500207
doi:
Types de publication
Journal Article
Langues
eng
Pagination
750Commentaires et corrections
Type : ErratumIn
Informations de copyright
Copyright © 2020 Naqvi, Schmid, Crovini, Sahay, Naujoks, Rodella, Zhang, Strohriegl, Bräse, Zysman-Colman and Brütting.
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