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The Theory of Thermally Activated Delayed Fluorescence for Organic Light Emitting Diodes

Lookup NU author(s): Dr Thomas Penfold

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2018.

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Abstract

The interest in organic molecules exhibiting Thermally Activated Delayed Fluorescence (TADF) has been reinvigorated in recent years owing to their potential to be exploited as emitters in highly efficient purely organic light emitting diodes (OLEDs). However, designing new molecules that exhibit efficient TADF is a non-trivial task because they would appear to require the optimisation of a number of contrasting properties. For example these molecules must exhibit rapid conversion between the singlet and triplet manifolds without the use of heavy elements to enhance spin- orbit coupling. They should also display a large fluorescence rate, but simultaneously a small energy gap between low lying singlet and triplet states. Consequently to achieve systematic material design, a detailed understanding of the fundamental factors influencing the photophysical behaviour of TADF emitters is essential. Towards achieving this goal, theory and computation is playing a crucial role. In this feature article the recent progress in the theory of organic TADF molecules in the context of OLEDs is presented, with a view of achieving a deeper understanding of these molecules and driving systematic material design.


Publication metadata

Author(s): Penfold TJ, Dias FD, Monkman AP

Publication type: Article

Publication status: Published

Journal: Chemical Communications

Year: 2018

Volume: 54

Issue: 32

Pages: 3926-3935

Print publication date: 18/04/2018

Online publication date: 16/03/2018

Acceptance date: 15/03/2018

ISSN (print): 1359-7345

ISSN (electronic): 1364-548X

Publisher: Royal Society of Chemistry

URL: https://doi.org/10.1039/C7CC09612G

DOI: 10.1039/C7CC09612G


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