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Multi-color Poly(Fluorenylene Ethynylene)s with On-Chain Phosphorescent Iridium(III) Complexes Through Energy Transfer

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Abstract

A series of multi-color emitting conjugated polymers, poly(fluorenylene ethynylene) (PFE) with on-chain phosphorescent iridium(III) complex (Ir(thq)2dbm) is synthesized. PFE copolymers with various contents of Ir(III)-complex units in the main chain are characterized by 1H NMR, 13C NMR, and gel permeation chromatography. The photophysical properties, including absorption, photoluminescence (PL), PL excitation spectra, PL quantum efficiency, and PL decay are investigated in detail. Similar to the phase transition from α phase to β phase of polyfluorene, two kinds of conformations are found for PFE in solutions. The α-like phase is dominant in dilute solution, while β-like phase is dominant in condensed solution. Blue, yellow, and red emissions are achieved from the copolymer film with the Ir(thq)2dbm feed ratios of 0, 8, and 16 mol%, respectively. Effect of ethynyl link in copolymer is discussed. Difference of PL spectra found for this series of copolymers between solution and film is analyzed using the energy transfer from PFE host to Ir(III)-complex guest.

Graphical Abstract

A multi-color emitting conjugated polymer, poly(fluorenylene ethynylene) (PFE) with on-chain phosphorescent iridium(III) complex (Ir(thq)2dbm), is synthesized. The photophysical properties are investigated. Blue, yellow, and red emissions are achieved from the copolymer film with the Ir(thq)2dbm feed ratios of 0, 8, and 16 mol%, respectively. Difference of PL spectra found for PFE copolymers between solution and film is analyzed using the energy transfer from PFE host to Ir(thq)2dbm guest.

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Acknowledgments

This work was supported by the National Basic Research Program of China (973 Program, 2012CB933301), National Natural Science Foundation of China (61274018, 61136003, 21304046 and 21174064), Program for New Century Excellent Talents in University (NCET-12-0740), the Ministry of Education of China (IRT1148), Natural Science Foundation of Jiangsu Province of China (BM2012010, BK20130038 and BK2012835), Natural Science Fund for Colleges and Universities in Jiangsu Province (14KJB430015), China Postdoctoral Science Foundation (51235005), Postdoctoral Science Foundation of Jiangsu Province (1402058B and 1402158C) and Priority Academic Program Development of Jiangsu Higher Education Institutions for financial support.

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Authors and Affiliations

  1. Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, National Jiangsu Syngerstic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications (NUPT), Nanjing, 210023, People’s Republic of China

    Huifang Shi, Shujuan Liu, Zhongfu An, Qiang Zhao & Wei Huang

  2. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, People’s Republic of China

    Huifang Shi, Taiju Tsuboi, Zhongfu An & Wei Huang

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  1. Huifang Shi
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  2. Taiju Tsuboi
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  3. Shujuan Liu
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  4. Zhongfu An
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  5. Qiang Zhao
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  6. Wei Huang
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Correspondence to Qiang Zhao or Wei Huang.

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Shi, H., Tsuboi, T., Liu, S. et al. Multi-color Poly(Fluorenylene Ethynylene)s with On-Chain Phosphorescent Iridium(III) Complexes Through Energy Transfer. J Inorg Organomet Polym 25, 720–729 (2015). https://doi.org/10.1007/s10904-014-0150-9

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