Towards Efficient and Stable Donor‐Acceptor Luminescent Radicals
dc.contributor.author | Lu, Chen | |
dc.contributor.author | Cho, Eunkyung | |
dc.contributor.author | Cui, Zhiyuan | |
dc.contributor.author | Gao, Yuhang | |
dc.contributor.author | Cao, Wenjuan | |
dc.contributor.author | Brédas, Jean‐Luc | |
dc.contributor.author | Coropceanu, Veaceslav | |
dc.contributor.author | Li, Feng | |
dc.date.accessioned | 2023-01-06T01:18:01Z | |
dc.date.available | 2023-01-06T01:18:01Z | |
dc.date.issued | 2022-12-16 | |
dc.identifier.citation | Lu, C., Cho, E., Cui, Z., Gao, Y., Cao, W., Brédas, J.-L., Coropceanu, V., & Li, F. (2022). Towards Efficient and Stable Donor-Acceptor Luminescent Radicals. Advanced Materials. | en_US |
dc.identifier.issn | 0935-9648 | |
dc.identifier.doi | 10.1002/adma.202208190 | |
dc.identifier.uri | http://hdl.handle.net/10150/667330 | |
dc.description.abstract | In contrast to closed-shell luminescent molecules, the electronic ground state and lowest excited state in organic luminescent radicals are both spin doublet, which results in spin-allowed radiative transitions. Most reported luminescent radicals with high photoluminescent quantum efficiency (PLQE) have a donor-acceptor (D–A•) chemical structure where an electron-donating group is covalently attached to an electron-withdrawing radical core (A•). Understanding the main factors that define the efficiency and stability of D-A• type luminescent radicals remains challenging. Here, we designed and synthesized a series of tri(2,4,6-trichlorophenyl)methyl (TTM) radical derivatives with donor substituents varying by their extent of conjugation and their number of imine-type nitrogen atoms. The experimental results suggest that the luminescence efficiency and stability of the radicals are proportional to the degree of conjugation but inversely proportional to the number of imine nitrogen atoms in the substituents. These experimental trends are very well reproduced by density functional theory calculations. The theoretical results indicate that both the luminescence efficiency and radical stability are related to the energy difference between the charge transfer (CT) and local-excitation (LE) states, which decreases as either the number of imine nitrogen atoms in the substituent increases or its conjugation length decreases. | en_US |
dc.description.sponsorship | National Natural Science Foundation of China | en_US |
dc.language.iso | en | en_US |
dc.publisher | Wiley | en_US |
dc.rights | © 2022 Wiley-VCH GmbH. | en_US |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en_US |
dc.subject | charge transfer state | en_US |
dc.subject | local-excitation state | en_US |
dc.subject | luminescent radicals | en_US |
dc.subject | photoluminescent quantum efficiency | en_US |
dc.subject | stability | en_US |
dc.title | Towards Efficient and Stable Donor‐Acceptor Luminescent Radicals | en_US |
dc.type | Article | en_US |
dc.identifier.eissn | 1521-4095 | |
dc.contributor.department | Department of Chemistry and Biochemistry, University of Arizona College of Science | en_US |
dc.identifier.journal | Advanced Materials | en_US |
dc.description.note | 12 month embargo; first published: 23 November 2022 | en_US |
dc.description.collectioninformation | This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. | en_US |
dc.eprint.version | Final accepted manuscript | en_US |
dc.identifier.pii | 10.1002/adma.202208190 | |
dc.source.journaltitle | Advanced Materials | |
dc.source.beginpage | 2208190 |