Balanced Energy Gaps as a Key Design Rule for Solution-Phase Organic Room Temperature Phosphorescence.

Autor: Paredis S; Design & Synthesis of Organic Semiconductors (DSOS) Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1, 3590, Diepenbeek, Belgium.; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium., Cardeynaels T; Design & Synthesis of Organic Semiconductors (DSOS) Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1, 3590, Diepenbeek, Belgium.; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium.; Laboratory of Theoretical Chemistry Theoretical and Structural Physical Chemistry Unit Namur Institute of Structured Matter, University of Namur, Rue de Bruxelles 61, 5000, Namur, Belgium., Kuila S; OEM group, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK., Deckers J; Design & Synthesis of Organic Semiconductors (DSOS) Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1, 3590, Diepenbeek, Belgium.; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium., Van Landeghem M; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium., Vandewal K; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium., Danos A; OEM group, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK., Monkman AP; OEM group, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK., Champagne B; Laboratory of Theoretical Chemistry Theoretical and Structural Physical Chemistry Unit Namur Institute of Structured Matter, University of Namur, Rue de Bruxelles 61, 5000, Namur, Belgium., Maes W; Design & Synthesis of Organic Semiconductors (DSOS) Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1, 3590, Diepenbeek, Belgium.; IMOMEC Division, IMEC, Wetenschapspark 1, 3590, Diepenbeek, Belgium.; Energyville, Thorpark, 3600, Genk, Belgium.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2023 Jul 26; Vol. 29 (42), pp. e202301369. Date of Electronic Publication: 2023 Jun 13.
DOI: 10.1002/chem.202301369
Abstrakt: Metal-free organic emitters that display solution-phase room temperature phosphorescence (sRTP) remain exceedingly rare. Here, we investigate the structural and photophysical properties that support sRTP by comparing a recently reported sRTP compound (BTaz-Th-PXZ) to two novel analogous materials, replacing the donor group by either acridine or phenothiazine. The emissive triplet excited state remains fixed in all three cases, while the emissive charge-transfer singlet states (and the calculated paired charge-transfer T 2 state) vary with the donor unit. While all three materials show dominant RTP in film, in solution different singlet-triplet and triplet-triplet energy gaps give rise to triplet-triplet annihilation followed by weak sRTP for the new compounds, compared to dominant sRTP throughout for the original PXZ material. Engineering both the sRTP state and higher charge-transfer states therefore emerges as a crucial element in designing emitters capable of sRTP.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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