Waterborne polyurethanes prepared from benzophenone derivatives with delayed fluorescence and room-temperature phosphorescence. Issue 11 (20th February 2018)

• Record Type: Journal Article
• Authors: Wang, Tao; Zhou, Cao; Zhang, Xingyuan; Xu, Dong
• Is Part Of: Polymer chemistry. Volume 9:Issue 11(2018)
• Page Start: 1303
• Page End: 1308
• Publication Date: 2018-02-20
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c7py01995e
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Charge-transfer states serve as a bridge between singlet and triplet states and polymerization can further promote communication between them. Abstract : Dual-emissive materials with both fluorescence and room-temperature phosphorescence (RTP) are extensively used in bioimaging, sensors, and optoelectronics. Here, a series of N, N -substituted benzophenone-based waterborne polyurethanes (WPUs) were synthesized by a facile polycondensation reaction, which exhibit both delayed fluorescence (DF) and RTP emission utilizing strong intramolecular charge-transfer states (CT states) to serve as a bridge between singlet and triplet states. The basic structural and luminescent characterization is mainly investigated. With an increase in dye loadings, there is a progressive mergence between the singlet and triplet states, which can be explained by polymerization-enhancing intersystem crossing (PEX), a model based on Kasha's molecular exciton theory, leading to tunable fluorescence and RTP. As a result, by a rational design it could be a common method to develop single-component luminescent materials with both fluorescence and RTP.