Solvothermal synthesis of columnar Gd ₂ O ₂ S:Eu ³⁺ and a comparative study with columnar Gd ₂ O ₃ :Eu ³⁺

Abstract

Abstract Columnar Gd 2 O 2 S:Eu 3+ nanophosphors have been synthesized through solvothermal reaction and subsequent calcination process. The structure, morphology, and luminescence properties of samples were investigated via X‐ray diffraction (XRD), Fourier transform infra‐red (FT‐IR) spectra, UV‐vis absorption spectra, field emission scanning electron microscope (FE‐SEM), and photoluminescence (PL) spectra. The Judd‐Ofelt (J‐O) parameters of Gd 2 O 2 S:Eu 3+ nanophosphors with different doping concentration were calculated by emission spectra to understand the symmetry, coordination environment, and luminescence behavior of Eu 3+ ions in Gd 2 O 2 S matrix. In addition, the luminescence properties of columnar Gd 2 O 2 S:Eu 3+ and Gd 2 O 3 :Eu 3+ were compared in detail. The comparison results show that there are subtle differences in luminescence intensity, main peak position, luminescence color, and fluorescence lifetime between them, which are closely related to their different substrate's structure, including the band‐gap energy, crystallinity, and symmetry, etc.