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dc.contributor.authorLu, Chen
dc.contributor.authorCho, Eunkyung
dc.contributor.authorCui, Zhiyuan
dc.contributor.authorGao, Yuhang
dc.contributor.authorCao, Wenjuan
dc.contributor.authorBrédas, Jean‐Luc
dc.contributor.authorCoropceanu, Veaceslav
dc.contributor.authorLi, Feng
dc.date.accessioned2023-01-06T01:18:01Z
dc.date.available2023-01-06T01:18:01Z
dc.date.issued2022-12-16
dc.identifier.citationLu, 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.issn0935-9648
dc.identifier.doi10.1002/adma.202208190
dc.identifier.urihttp://hdl.handle.net/10150/667330
dc.description.abstractIn 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.sponsorshipNational Natural Science Foundation of Chinaen_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rights© 2022 Wiley-VCH GmbH.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.subjectcharge transfer stateen_US
dc.subjectlocal-excitation stateen_US
dc.subjectluminescent radicalsen_US
dc.subjectphotoluminescent quantum efficiencyen_US
dc.subjectstabilityen_US
dc.titleTowards Efficient and Stable Donor‐Acceptor Luminescent Radicalsen_US
dc.typeArticleen_US
dc.identifier.eissn1521-4095
dc.contributor.departmentDepartment of Chemistry and Biochemistry, University of Arizona College of Scienceen_US
dc.identifier.journalAdvanced Materialsen_US
dc.description.note12 month embargo; first published: 23 November 2022en_US
dc.description.collectioninformationThis 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.versionFinal accepted manuscripten_US
dc.identifier.pii10.1002/adma.202208190
dc.source.journaltitleAdvanced Materials
dc.source.beginpage2208190


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