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

Fernando B. Dias | Zendy

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

Author(s) -

Fernando B. Dias

Publication year - 2015

Publication title -

philosophical transactions of the royal society a mathematical physical and engineering sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.074

H-Index - 169

eISSN - 1471-2962

pISSN - 1364-503X

DOI - 10.1098/rsta.2014.0447

Subject(s) - intersystem crossing , oled , fluorescence , singlet state , photochemistry , materials science , kinetics , annihilation , optoelectronics , band gap , diode , chemistry , excited state , nanotechnology , atomic physics , optics , physics , layer (electronics) , quantum mechanics

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 (ΔE(a)) 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 (ΔE(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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