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dc.contributor.authorWu, Hongweien_US
dc.contributor.authorGu, Longen_US
dc.contributor.authorBaryshnikov, Glib V.en_US
dc.contributor.authorWang, Houen_US
dc.contributor.authorMinaev, Boris F.en_US
dc.contributor.authorÅgren, Hansen_US
dc.contributor.authorZhao, Yanlien_US
dc.identifier.citationWu, H., Gu, L., Baryshnikov, G. V., Wang, H., Minaev, B. F., Ågren, H., & Zhao, Y. (2020). Molecular phosphorescence in polymer matrix with reversible sensitivity. ACS Applied Materials and Interfaces, 12(18), 20765–20774. doi:10.1021/acsami.0c04859en_US
dc.description.abstractUltralong organic phosphorescence strongly depends on the formation of aggregation, while it is difficult to obtain in dilute environments on account of excessive internal and external molecular motions. Herein, ultralong single-molecule phosphorescence (USMP) at room temperature was achieved in the monomer state by coassembling biphenyl and naphthalene derivatives at low density with poly(vinyl alcohol) (PVA), where PVA provides a confined environment to stabilize the triplet state. Various factors that affect the USMP were studied, including aggregation, conformation, temperature, and moisture. In these systems, the formation of aggregates through intermolecular stacking and hydrogen bonding interactions in the film or crystal phases completely suppresses the USMP. However, the fluorescence is enhanced when coassembling these compounds at high concentration with PVA and becomes stronger in their powder state, indicating that the intersystem crossing process is blocked by the aggregation. Theoretical calculations suggest that the aggregation depresses spin−orbit coupling between the excited singlet and triplet states and enhances the nonradiative quenching process. Moreover, a relatively twisted conformation is more conducive to the occurrence of intersystem crossing than planar conformation. The USMP shows delicate and reversible sensitivity to the changes of temperature and moisture, rendering them with the applicability as smart organic optoelectronic materials.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofACS Applied Materials and Interfacesen_US
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
dc.titleMolecular phosphorescence in polymer matrix with reversible sensitivityen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsPolymer Matrixen_US
dc.subject.keywordsReversible Sensitivityen_US
dc.description.acknowledgementThis research is supported by the Singapore Agency for Science, Technology and Research (A*STAR) AME IRG grant (No. A1883c0005), and the Singapore National Research Foundation Investigatorship (No. NRF-NRFI2018-03).en_US
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