Thermally stable and strongly emitted CPL in Eu(d-facam)3 hybrid solids with an alkylammonium salt?

Journal of Materials Chemistry C Pub Date: 2022-11-29 DOI: 10.1039/D2TC04670A

Abstract

A novel europium-based hybrid material, Eu(D-facam)3-TMAOAc (tetramethylammonium acetate), with ultra-high luminescence, excellent circular polarization and remarkable thermostability was prepared. Its photophysical performance was studied based on the luminescence properties and energy transfer process. Compared to Eu(D-facam)3, Eu(D-facam)3-TMAOAc exhibited much brighter luminescence and stronger circular polarization. Additionally, Eu(D-facam)3-TMAOAc well retained its structure and luminescence properties even after heat treatment at 200 °C for 24 hours, whereas Eu(D-facam)3 rapidly decomposed. Eu(D-facam)3-TMAOAc was characterized by TG analysis, elemental analysis, ESI-mass spectrometry, PXRD, and FT-IR spectroscopy. It was found that TMAOAc acted as a bidentate bridge linker with Eu(D-facam)3 at a 1?:?1 ratio. This coordination structure contributed to the excellent photophysical properties and thermal stability of Eu(D-facam)3-TMAOAc. Furthermore, Eu(D-facam)3-TMAOAc showed a high solubility in common organic solvents, and it could maintain its outstanding luminescence properties in solid as well as solution states.

Graphical abstract: Thermally stable and strongly emitted CPL in Eu(d-facam)3 hybrid solids with an alkylammonium salt
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