bei Google ScholarTitelangaben
Naqvi, Bilal A. ; Schmid, Markus ; Crovini, Ettore ; Sahay, Prakhar ; Naujoks, Tassilo ; Rodella, Francesco ; Zhang, Zhen ; Strohriegl, Peter ; Bräse, Stefan ; Zysman-Colman, Eli ; Brütting, Wolfgang:
What Controls the Orientation of TADF Emitters?
In: Frontiers in Chemistry.
Bd. 8
(2020)
.
- 750.
ISSN 2296-2646
DOI: https://doi.org/10.3389/fchem.2020.00750
Abstract
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<sub>g</sub> and its tendency for alignment being expressed, e.g., as birefringence or the formation of a giant surface potential of the host. Electrostatic dipole-dipole interactions between host and emitter are not found to play an important role.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | OLEDs; TADF; emitter orientation; molecular orientation; emitter-host interaction |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Professur Makromolekulare Chemie I Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Ehemalige ProfessorInnen > Professur Makromolekulare Chemie I - Univ.-Prof. Dr. Peter Strohriegl Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Ehemalige ProfessorInnen |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 11 Jul 2022 07:28 |
| Letzte Änderung: | 14 Jun 2023 11:06 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/70477 |