Solid-state photoluminescence, energy transfer mechanism and optical band gap of two 4f-5d complexes with 1-D chain-like structure

摘要: Abstract Under hydrothermal conditions, two novel lanthanide (III)-mercury (II) compounds [Ln (IA)3(H3O)2]2n·2n (HgCl4)·n (Hg2Cl5)·nH3O·3nH2O (Ln ​= ​Eu, 1; Tm, 2; HIA ​= ​isonicotinic acid) were synthesized. The single-crystal X-ray diffraction revealed that they are isostructural and feature a one-dimensional (1-D) chain-like structure three-dimensional (3-D) supramolecular network. Solid-state photoluminescence experiments show red or blue emission bands, which can be assigned to the characteristic emissions of 4f electron intrashell transitions 5D0 → 7FJ (J ​= ​1, 2, 3, 4; Eu3+, 1) 1G4 3H6 (Tm3+, 2), respectively. energy transfer mechanisms by level diagrams Eu3+ Tm3+ ions isonicotinic acid ligand. Both exhibit remarkable CIE chromaticity coordinates (0.6454, 0.3543) (0.1092, 0.1497) for 1 UV–Vis–NIR diffuse reflectance spectra uncovered possess wide optical band gaps 3.16 ​eV 3.18 ​eV