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Title: | Benzo[1,2-b:4,5-b']dithiophene as a weak donor component for push-pull materials displaying thermally activated delayed fluorescence or room temperature phosphorescence | Authors: | CARDEYNAELS, Tom PAREDIS, Simon Danos, Andrew VANDERZANDE, Dirk Monkman, Andrew P. Champagne, Benoit MAES, Wouter |
Issue Date: | 2021 | Publisher: | ELSEVIER SCI LTD | Source: | Dyes and Pigments, 186 (Art N° 109022) | Abstract: | In the search for high-performance donor-acceptor type organic compounds displaying thermally activated delayed fluorescence (TADF), triisopropylsilyl-protected benzo[1,2-b:4,5-b']dithiophene (BDT-TIPS) is presented as a novel donor component in combination with two known acceptors: dimethyl-9H-thioxanthenedioxide (TXO2) and dibenzo[a,c]phenazinedicarbonitrile (CNQxP). For a broader comparison, the same acceptors are also combined with the well-studied 9,9-dimethyl-9,10-dihydroacridine (DMAC) donor. Optimized BDT-TIPS containing structures show calculated dihedral angles of around 50 degrees and well-separated highest occupied and lowest unoccupied molecular orbitals, although varying singlet-triplet energy gaps are observed experimentally. By changing the acceptor moiety and the resulting ordering of excited states, room temperature phosphorescence (RTP) attributed to localized BDT-TIPS emission is observed for TXO2-BDT-TIPS, whereas CNQ(x)P-BDT-TIPS affords a combination of TADF and triplet-triplet annihilation (TTA) delayed emission. In contrast, strong and pure TADF is well-known for TXO2-DMAC, whereas CNQ(x)P-DMAC shows a mixture of TADF and TTA at very long timescales. Overall, BDT-TIPS represents an alternative low-strength donor component for push-pull type TADF emitters that is also able to induce RTP properties. | 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. wouter.maes@uhasselt.be |
Other: | Maes, W (corresponding author), Hasselt Univ, Inst Mat Res IMO IMOMEC, Design & Synth Organ Semicond DSOS, Agoralaan 1, B-3590 Diepenbeek, Belgium. Hasselt Univ, Inst Mat Res IMO IMOMEC, Design & Synth Organ Semicond DSOS, Agoralaan 1, B-3590 Diepenbeek, Belgium. wouter.maes@uhasselt.be | Keywords: | Thermally activated delayed fluorescence;Organic light-emitting diodes;Room temperature phosphorescence;Benzo[1;2-b:4;5-b']dithiophene;Photophysical and quantum-chemical characterizations | Document URI: | http://hdl.handle.net/1942/33308 | ISSN: | 0143-7208 | e-ISSN: | 1873-3743 | DOI: | 10.1016/j.dyepig.2020.109022 | ISI #: | WOS:000603543900001 | Rights: | 2020 Elsevier Ltd. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Revised BDT-TIPS manuscript Cardeynaels et al.pdf | Peer-reviewed author version | 1.85 MB | Adobe PDF | View/Open |
1-s2.0-S0143720820317198-main.pdf Restricted Access | Published version | 6.68 MB | Adobe PDF | View/Open Request a copy |
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