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

Dias, Fernando 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). p. 20140447.

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.

Item Type:Article
Keywords:Thermally activated delayed fluorescence, Delayed fluorescence, Organic light-emitting diodes, Reverse intersystem crossing, Triplet–triplet annihilation.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1098/rsta.2014.0447
Date accepted:09 March 2015
Date deposited:18 January 2016
Date of first online publication:June 2015
Date first made open access:18 May 2016

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