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.
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.
|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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|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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