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Title: | Balanced Energy Gaps as a Key Design Rule for Solution-Phase Organic Room Temperature Phosphorescence | Authors: | PAREDIS, Simon CARDEYNAELS, Tom Kuila, Suman DECKERS, Jasper VAN LANDEGHEM, Melissa VANDEWAL, Koen Danos, Andrew Monkman, Andrew P. Champagne, Benoit MAES, Wouter |
Issue Date: | 2023 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | CHEMISTRY-A EUROPEAN JOURNAL, 29 (42) (Art N° e202301369) | Abstract: | 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. | Notes: | Maes, W (corresponding author), Hasselt Univ, Inst Mat Res IMO IMOMEC, Design & Synth Organ Semicond DSOS, Agoralaan 1, B-3590 Diepenbeek, Belgium.; Maes, W (corresponding author), IMEC, IMOMEC Div, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Maes, W (corresponding author), Energyville, Thorpk, B-3600 Genk, Belgium.; Danos, A (corresponding author), Univ Durham, Dept Phys, OEM Grp, South Rd, Durham DH1 3LE, England. andrew.danos@durham.ac.uk; wouter.maes@uhasselt.be |
Keywords: | donor-acceptor fluorophores;energy gap tuning;room temperature phosphorescence;time-resolved spectroscopy | Document URI: | http://hdl.handle.net/1942/40543 | ISSN: | 0947-6539 | e-ISSN: | 1521-3765 | DOI: | 10.1002/chem.202301369 | ISI #: | 001008389100001 | Rights: | 2023 Wiley-VCH GmbH. Free access | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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Chemistry A European J - 2023 - Paredis.pdf Restricted Access | Published version | 1.8 MB | Adobe PDF | View/Open Request a copy |
Päredis et al.pdf Until 2024-10-31 | Peer-reviewed author version | 1.22 MB | Adobe PDF | View/Open Request a copy |
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