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Kinetics of thermal-assisted delayed fluorescence in blue organic emitters with large singlet–triplet energy gap

Dias, Fernando B.

Kinetics of thermal-assisted delayed fluorescence in blue organic emitters with large singlet–triplet energy gap Thumbnail


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Abstract

The kinetics of thermally activated delayed fluorescence (TADF) is investigated in dilute solutions of organic materials with application in blue light-emitting diodes (OLEDs). A method to accurately determine the energy barrier (ΔEa) and the rate of reverse intersystem crossing (kRisc) in TADF emitters is developed, and applied to investigate the triplet-harvesting mechanism in blue-emitting materials with large singlet–triplet energy gap (ΔEST). In these materials, triplet–triplet annihilation (TTA) is the dominant mechanism for triplet harvesting; however, above a threshold temperature TADF is able to compete with TTA and give enhanced delayed fluorescence. Evidence is obtained for the interplay between the TTA and the TADF mechanisms in these materials.

Citation

Dias, F. B. (2015). Kinetics of thermal-assisted delayed fluorescence in blue organic emitters with large singlet–triplet energy gap. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 373(2044), Article 20140447. https://doi.org/10.1098/rsta.2014.0447

Journal Article Type Article
Acceptance Date Mar 9, 2015
Publication Date Jun 1, 2015
Deposit Date Jan 12, 2016
Publicly Available Date May 18, 2016
Journal Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences.
Print ISSN 1364-503X
Electronic ISSN 1471-2962
Publisher The Royal Society
Peer Reviewed Peer Reviewed
Volume 373
Issue 2044
Article Number 20140447
DOI https://doi.org/10.1098/rsta.2014.0447
Keywords Thermally activated delayed fluorescence, Delayed fluorescence, Organic light-emitting diodes, Reverse intersystem crossing, Triplet–triplet annihilation.

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