Molecular phosphorescence in polymer matrix with reversible sensitivity
Open accessAbstract
Ultralong 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.
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PSP@PVA-H can be converted to PSP@PVA-N to regenerate RTP in the presence of a proper base (amine gas or ammonia), although RTP is reduced compared with its original state before vacuum drying to remove water.
“Furthermore, PSP@PVA-H can be converted to PSP@PVA-N to regenerate RTP in the presence of a proper base (amine gas or ammonia), although RTP will be reduced compared with its original state before vacuum drying to remove water [42,43].”
From Red-light excited efficient metal-free near-infrared room-temperature phosphorescent films (2022) · cites this paper as [42]
The Results and Discussion describes humidity quenching phosphorescence in BPAM–PVA films and restoring it by heating and cooling; no page number is available in our copy. Searches for PSP@PVA-H, PSP@PVA-N, amine gas, ammonia, and vacuum drying found no passage addressing the claimed base-driven conversion or its reduced RTP intensity. (LLM, conf=0.75)
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Sorted by citations
Red-light excited efficient metal-free near-infrared room-temperature phosphorescent films
Sun, S., Ma, L., Wang, J., Ma, X., & Tian, H. (2022) · National Science Review · doi:10.1093/nsr/nwab085 · Cited by 108 · see citing works
“Furthermore, PSP@PVA-H can be converted to PSP@PVA-N to regenerate RTP in the presence of a proper base (amine gas or ammonia), although RTP will be reduced compared with its original state before vacuum drying to remove water [42,43].”
Background
- Authors
- Wu, H., Gu, L., Baryshnikov, G. V., Wang, H., Minaev, B. F., Ågren, H., & Zhao, Y.
- Affiliations
- Nanyang Technological University (SG)
- Cherkasy National University (UA)
- Henan University (CN)
- Corresponding author
- Ågren, Hans
- Zhao, Yanli
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-04-10
- Volume
- 12
- Issue
- 18
- Pages
- 20765-20774
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W3016057020
- Cited by
- 107
- References
- 54
- Citations by year
- 2026: 8 · 2025: 14 · 2024: 24 · 2023: 26 · 2022: 15 · 2021: 13 · 2020: 7
- FWCI
- 5.94
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- DR-NTU (Nanyang Technological University) (submittedVersion)
- Funders
- Agency for Science, Technology and Research (A1883c0005)
- National Research Foundation Singapore (NRF-NRFI2018-03)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Keywords
- polyvinyl alcohol, biphenyl derivatives, naphthalene derivatives, aggregation, intersystem crossing, spin-orbit coupling, nonradiative quenching, molecular conformation, hydrogen bonding, temperature sensitivity, moisture sensitivity, polymer matrix
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