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Cluster-induced aggregation in polyurethane derivatives with multicolour emission and ultra-long organic room temperature phosphorescence

Jiang, Nan; Li, Ke-Xin; Wang, Jia-Jun; Li, Chen-Sen; Xu, Xiao-Yu; Xu, Yan-Hong; Bryce, Martin R.

Cluster-induced aggregation in polyurethane derivatives with multicolour emission and ultra-long organic room temperature phosphorescence Thumbnail


Authors

Nan Jiang

Ke-Xin Li

Jia-Jun Wang

Chen-Sen Li

Xiao-Yu Xu

Yan-Hong Xu



Abstract

Non-conjugated luminescent polymers (NCLPs) have the advantages of simple synthesis, optical tunability, and excellent processability. However, the underlying luminous mechanism in NCLPs remains obscure and it is a considerable challenge to obtain NCLPs with ultra-long phosphorescence lifetime and multicolour emission simultaneously. In this article, linear polyurethane derivatives (PUs) with cluster-induced aggregation, multicolour luminescence and ultra-long phosphorescence have been prepared by simply adjusting the reaction temperature and the reaction time. DFT calculations and molecular dynamics simulations provide elaborate microstructural information on the PUs. With the synergistic effect of abundant hydrogen bonding interactions, through-space dative bonds, short interatomic contacts and oxygen clusters various luminous clusters are formed. The energy level splitting caused by clusters with different extents of spatial conjugation endows the NCLPs with multicolour clusteroluminescence, promotes intersystem crossing (ISC), and stabilises the triplet excited state, and finally an ultra-long room temperature phosphorescence (RTP) lifetime of 0.45 s is attained. Experimental encryption/decryption models validate the potential of the PUs in information security. The results have important implications for understanding the intrinsic mechanism of unconventional luminescence in the absence of any traditional conjugative units or heavy atom effects, and they provide a new horizon for the strategic design of multicolour luminescence and ultra-long phosphorescence in NCLPs for a range of practical applications.

Citation

Jiang, N., Li, K., Wang, J., Li, C., Xu, X., Xu, Y., & Bryce, M. R. (2023). Cluster-induced aggregation in polyurethane derivatives with multicolour emission and ultra-long organic room temperature phosphorescence. Journal of Materials Chemistry C Materials for optical and electronic devices, https://doi.org/10.1039/d3tc04141g

Journal Article Type Article
Acceptance Date Nov 30, 2023
Online Publication Date Dec 19, 2023
Publication Date Dec 19, 2023
Deposit Date Jan 2, 2024
Publicly Available Date Jan 2, 2024
Journal Journal of Materials Chemistry C
Print ISSN 2050-7526
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1039/d3tc04141g
Public URL https://durham-repository.worktribe.com/output/2049781

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