A Thermally Activated Delayed Fluorescence Emitter Investigated by Time‐Resolved Near‐Infrared Spectroscopy

Emitters for organic light‐emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) require small singlet (S(1))‐triplet (T(1)) energy gaps as well as fast intersystem crossing (ISC) transitions. These transitions can be mediated by vibronic mixing with higher excited states...

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Detalles Bibliográficos
Autores principales: Haselbach, Wiebke, Kaminski, Jeremy M., Kloeters, Laura N., Müller, Thomas J. J., Weingart, Oliver, Marian, Christel M., Gilch, Peter, Nogueira de Faria, Barbara E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Research Articles
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10098753/
https://www.ncbi.nlm.nih.gov/pubmed/36214291
http://dx.doi.org/10.1002/chem.202202809
Descripción
Sumario:Emitters for organic light‐emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) require small singlet (S(1))‐triplet (T(1)) energy gaps as well as fast intersystem crossing (ISC) transitions. These transitions can be mediated by vibronic mixing with higher excited states S( n ) and T( n ) (n=2, 3, 4, …). For a prototypical TADF emitter consisting of a triarylamine and a dicyanobenzene moiety (TAA‐DCN) it is shown that these higher states can be located energetically by time‐resolved near‐infrared (NIR) spectroscopy.

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