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Polymers 2017, 9(9), 411; https://doi.org/10.3390/polym9090411

Dual-Emissive Waterborne Polyurethanes Prepared from Naphthalimide Derivative

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
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Received: 7 August 2017 / Revised: 28 August 2017 / Accepted: 31 August 2017 / Published: 3 September 2017
(This article belongs to the Special Issue Polymeric Materials for Optical Applications)
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Abstract

Fluorescent and room-temperature phosphorescent (RTP) materials are widely used in bioimaging, chemical sensing, optoelectronics and encryption. Here, a series of single-component dual-emissive waterborne polyurethanes (WPUs) with both fluorescence and room-temperature phosphorescence were synthesized. Dye without halogen atom incorporated into WPUs can only exhibit fluorescence due to poor spin-orbit coupling. When bromine atom is introduced into dye, we found that WPUs can emit both fluorescence and room-temperature phosphorescence with lifetimes up to milliseconds because of enhanced spin-orbit coupling. Moreover, with an increase in dye concentrations in WPUs, excimers are formed due to the aggregation effect, and may promote communication between singlet and triplet states. At different dye concentrations, structural, thermal, and luminescent properties serve as the main focus. View Full-Text
Keywords: fluorescence; room-temperature phosphorescence; dual-emissive; waterborne polyurethane; halogen atom effect; excimers fluorescence; room-temperature phosphorescence; dual-emissive; waterborne polyurethane; halogen atom effect; excimers
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Wang, T.; Zhang, X.; Deng, Y.; Sun, W.; Wang, Q.; Xu, F.; Huang, X. Dual-Emissive Waterborne Polyurethanes Prepared from Naphthalimide Derivative. Polymers 2017, 9, 411.

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