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

Bergmann, Larissa 1; Hedley, Gordon J.; Baumann, Thomas; Bräse, Stefan 1,2; Samuel, Ifor D. W.
1 Institut für Organische Chemie (IOC), Karlsruher Institut für Technologie (KIT)
2 Institut für Toxikologie und Genetik (ITG), Karlsruher Institut für Technologie (KIT)


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.

Volltext §
DOI: 10.5445/IR/1000062030
DOI: 10.1126/sciadv.1500889
Zitationen: 106
Web of Science
Zitationen: 100
Zitationen: 109
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Organische Chemie (IOC)
Institut für Toxikologie und Genetik (ITG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2375-2548
KITopen-ID: 1000062030
HGF-Programm 47.01.01 (POF III, LK 01) Biol.Netzwerke u.Synth.Regulat. ITG+ITC
Erschienen in Science advances
Verlag American Association for the Advancement of Science (AAAS)
Band 2
Heft 1
Seiten e1500889
Vorab online veröffentlicht am 01.01.2016
Nachgewiesen in Dimensions
Web of Science
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