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<p>Investigation of luminescent materials with efficient photoluminescence (PL) and mechanoluminescence (ML) is significant for the development of both basic theories and industrial applications for new light sources, pressure sensors, and information security. In this study, we obtain a pair of isomorphic europium(Eu)<sup>3+</sup>-containing coordination polymers (CPs), namely, [Eu(tfpd)<sub>3</sub>(phen)]<sub><i>n</i></sub> (<b>1</b>) and [Eu(tfpd)<sub>3</sub>(bipy)]<sub><i>n</i></sub> (<b>2</b>) (tfpd = 4,4,4-trifluoro-4-pyridyl-1,3-diketonate, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine), which exhibit novel helical chain-like structures that can be extended to 3D supramolecular networks through moderate interchain interactions. The thermostable CPs simultaneously exhibit strong photoluminescence (PL) emissions with high quantum yields and excellent mechanoluminescence (ML) activity with an unusual anti-thermal quenching effect. Careful analyses of the CP crystal structures and optical performances, coupled with theoretical calculations, demonstrate that the PL emission depends on the asymmetric Eu<sup>3+</sup> coordination spheres, whereas the ML activity is significantly correlated with molecular packing derived from appropriate interchain H-bonding interactions. As these CPs have highly efficient optical activities, they have promising potential applications in pressure sensing, anti-counterfeiting, and fingerprint recognition technologies.</p>

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Concurrently bright photoluminescence and mechanoluminescence in helical chain-like Eu(III) coordination polymers

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Xiaoli Sun,
  • Yuantian Zheng,
  • Xingman Liu,
  • Xin He,
  • Zhaopeng Zeng,
  • Xuelian Wang,
  • Peipei Cen,
  • Danian Tian,
  • Dengfeng Peng,
  • Xiangyu Liu

摘要

Investigation of luminescent materials with efficient photoluminescence (PL) and mechanoluminescence (ML) is significant for the development of both basic theories and industrial applications for new light sources, pressure sensors, and information security. In this study, we obtain a pair of isomorphic europium(Eu)3+-containing coordination polymers (CPs), namely, [Eu(tfpd)3(phen)]n (1) and [Eu(tfpd)3(bipy)]n (2) (tfpd = 4,4,4-trifluoro-4-pyridyl-1,3-diketonate, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine), which exhibit novel helical chain-like structures that can be extended to 3D supramolecular networks through moderate interchain interactions. The thermostable CPs simultaneously exhibit strong photoluminescence (PL) emissions with high quantum yields and excellent mechanoluminescence (ML) activity with an unusual anti-thermal quenching effect. Careful analyses of the CP crystal structures and optical performances, coupled with theoretical calculations, demonstrate that the PL emission depends on the asymmetric Eu3+ coordination spheres, whereas the ML activity is significantly correlated with molecular packing derived from appropriate interchain H-bonding interactions. As these CPs have highly efficient optical activities, they have promising potential applications in pressure sensing, anti-counterfeiting, and fingerprint recognition technologies.