期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 32, 页码 8082-8090出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02381b
关键词
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资金
- National Natural Science Foundation of China [21574015]
- Program for Changjiang Scholars and Innovative Research Team (PCSIRT) in University
Nonconventional luminescent polymers have attracted rapidly growing attention owing to their importance in the fundamental understanding of fluorescence mechanisms and potential practical applications. However, most non-conjugated luminogens exhibit weak blue emission. Incorporating different nonconventional chromophores and adjusting molecular structures of polymers are assumed to enable the formation of more conformations with strong intra-and/or interchain interactions, leading to strong and red-shifted emissions. In this work, we synthesized poly(maleic anhydride-alt-vinyl pyrrolidone) (PMVP) copolymers with different molecular weights through a conventional free radical precipitation copolymerization method. The emissions of PMVPs are significantly red-shifted in comparison to those of the homopolymers poly(maleic anhydride) and poly(N-vinyl-2-pyrrolidone). The PMVPs exhibit aggregation-induced emission (AIE) characteristics, as they are highly emissive in concentrated solutions or in the solid state. The PMVPs also exhibit significant molecular weight-dependent fluorescence (MWDF) and excitation-dependent fluorescence (EDF). The photoluminescence (PL) intensity of their DMSO solutions increases with decreasing molecular weight and their maximal emission wavelength (lambda(max)(ex)) is red-shifted. Moreover, they can emit a wide range of colours from blue to red under different excitation wavelengths. Very impressively, poly(itaconic anhydride-covinyl pyrrolidone) (PIVP) copolymers with a lower chain rigidity emit very strong red emission at about 600 nm in a wide excitation wavelength range, which is rarely reported for non-conjugated luminogens. This study may shed some light on the preparation of nonconventional luminescent polymers with strong and red-shifted fluorescence emission.
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