Aggregation-Induced Long-Lived Phosphorescence in Non-Conjugated Polyurethane Derivatives at 77 K

Jiang, N.; Li, G-F.; Zhang, B-H.; Zhu, D-X.; Su, Z-M.; Bryce, M.R.

doi:10.1021/acs.macromol.8b00715

Aggregation-Induced Long-Lived Phosphorescence in Non-Conjugated Polyurethane Derivatives at 77 K

Jiang, N.; Li, G-F.; Zhang, B-H.; Zhu, D-X.; Su, Z-M.; Bryce, M.R.

Authors

N. Jiang

G-F. Li

B-H. Zhang

D-X. Zhu

Z-M. Su

Professor Martin Bryce m.r.bryce@durham.ac.uk
Professor

Abstract

Achieving long-persistent phosphorescence in polymers is a challenge even at low temperatures. In this work, long-persistent phosphorescence (>1 s) is observed in nonconjugated polyurethane derivatives at 77 K, which is among the longest reported phosphorescent lifetimes for an organic polymer. The mechanism for this unusual behavior has been shown by steady-state photophysical characterization and time-resolved emission spectra to arise from the formation of intra- and/or intermolecular carbonyl clusters at low temperature. The lifetime of long-persistent phosphorescence is increased by the introduction of an aromatic monomer into the nonconjugated polyurethane chains. This is attributed to intra- and/or intermolecular n−π* transitions from electron-rich carbonyl groups to the conjugated aromatic units, thereby enhancing the intersystem crossing rate. Coating an ultraviolet InGaAsN light-emitting diode with a polyurethane derivative as the emitter gives cryogenic afterglow with long-persistent phosphorescence that is observed for up to 7 s with the naked eye.

Citation

Jiang, N., Li, G., Zhang, B., Zhu, D., Su, Z., & Bryce, M. (2018). Aggregation-Induced Long-Lived Phosphorescence in Non-Conjugated Polyurethane Derivatives at 77 K. Macromolecules, 51(11), 4178-4184. https://doi.org/10.1021/acs.macromol.8b00715

Journal Article Type	Article
Acceptance Date	May 12, 2018
Online Publication Date	May 23, 2018
Publication Date	Jun 12, 2018
Deposit Date	May 14, 2018
Publicly Available Date	May 14, 2018
Journal	Macromolecules
Print ISSN	0024-9297
Electronic ISSN	1520-5835
Publisher	American Chemical Society
Peer Reviewed	Peer Reviewed
Volume	51
Issue	11
Pages	4178-4184
DOI	https://doi.org/10.1021/acs.macromol.8b00715

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