Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 373, Issue 2044, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsta.2014.0447
Keywords
thermally activated delayed fluorescence; delayed fluorescence; organic light-emitting diodes; reverse intersystem crossing; (t)riplet-triplet annihilation
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Funding
- EPSRC [EP/I006656/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I006656/1] Funding Source: researchfish
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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 (Delta E-a) and the rate of reverse intersystem crossing (k(Risc)) in TADF emitters is developed, and applied to investigate the triplet-harvesting mechanism in blue-emitting materials with large singlet-triplet energy gap (Delta E-ST). 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.
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