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

摘要

A novel 4 f – 5 d material (HgDy 6 Br 12 )Hg 8 Br 24 ( 1 ) is prepared by hydrothermal reactions and structurally characterized by single crystal X-ray diffraction. Compound 1 is characterized by a two-dimensional (2 D ) 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.