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Highly emissive phosphorescence nanoparticles sensitized by a TADF polymer for time-resolved luminescence imaging

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Abstract

The development of luminescent probes with long excited state lifetimes is essential for time-resolved biological imaging, among which Ir(III) complexes are particularly promising. Considearble efforts have been devoted to increasing the luminescence efficiency of a bioprobe based on the Ir(III) complex in water. A novel and facile design principle of nanoparticles with highly emissive phosphorescence sensitized by a thermally activated delayed fluorescence (TADF) polymer for bioimaging has been proposed in this study. The homogenous doping of a small amount of the Ir(III) complex with the TADF polymer (2.5% doping ratio) via non-covalent assembly in nanoparticles induced an efficient energy transfer from the TADF polymer to the Ir(III) complex, thus enhancing both emission intensity and luminescence lifetime. In addition, these nanoparticles, which were used in time-resolved luminescence bioimaging, exhibited good dispersibility in water and excellent biocompatibility. Therefore, this method significantly reduced the concentration of the Ir(III) complexes and decreased the toxicity risk of heavy metals.

Graphical abstract: Highly emissive phosphorescence nanoparticles sensitized by a TADF polymer for time-resolved luminescence imaging

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Supplementary files

Article information


Submitted
07 Apr 2020
Accepted
30 May 2020
First published
02 Jun 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Highly emissive phosphorescence nanoparticles sensitized by a TADF polymer for time-resolved luminescence imaging

L. Xu, J. Wang, Q. Luo, G. Chen, F. Ni, Z. Zhu, Q. Zhao, G. Zhang and C. Yang, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00215A

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