Magnetic, Photoluminescent and Semiconductor Properties of a 4f-5d Bromide Compound

Abstract

A novel 4f–5d material (HgDy₆Br₁₂)Hg₈Br₂₄ (1) is prepared by hydrothermal reactions and structurally characterized by single crystal X-ray diffraction. Compound 1 is characterized by a two-dimensional (2D) layered structure. A photoluminescence measurement with solid-state samples shows that this compound exhibits a strong emission in the blue region. A narrow optical band gap of 1.97 eV is revealed by a solid-state UV/Vis diffuse reflectance spectrum. The variable-temperature magnetic susceptibility obeys the Curie-Weiss law (c_m= c/(T–q)) with C = 0.78 K and a Weiss constant θ = –0.38 K as revealed by the magnetic measurements, suggesting the existence of an antiferromagnetic interaction.