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Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

Bergmann, Larissa; Hedley, Gordon J.; Baumann, Thomas; Bräse, Stefan; Samuel, Ifor D. W.

Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets aswell as singlet excited states for emission in organic light emitting diodes.We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 ps. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 μs. These first measurements of intersystemcrossing in the solid state in this class ofmononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.

Zugehörige Institution(en) am KIT Institut für Organische Chemie (IOC)
Institut für Toxikologie und Genetik (ITG)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1126/sciadv.1500889
ISSN: 2375-2548
URN: urn:nbn:de:swb:90-620304
KITopen ID: 1000062030
HGF-Programm 47.01.01; LK 01
Erschienen in Science advances
Band 2
Heft 1
Seiten e1500889
Lizenz CC BY 4.0: Creative Commons Namensnennung 4.0 International
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