Abstract
A novel erbium-mercury complex [Er(HIA)3(H2O)2]n [0.5n (2,6-NA)](nHgBr4) (denoted as compound 1, HIA = isonicotinic acid; 2,6-NA = 2,6-Naphthalenedisulfonic acid) has been synthesized via a hydrothermal reaction and characterized by single crystal X-ray diffraction technique. Compound 1 features a one-dimensional (1-D) chain-like structure. A solid state photoluminescence measurement revealed that there are two upconversion emission peaks at 487 nm and 529 nm, of which the latter is stronger. These peaks can be assigned to the characteristic emission of 4f electron intrashell transitions of Er3+ ions 4F7/2 → 4I15/2 and 2H11/2 → 4I15/2. A energy transfer mechanism of photoluminescence emission was described using an energy state diagram of Er3+ ions and isonicotinic acid ligand. Compound 1 shows CIE chromaticity coordinates in the green region (0.1559, 0.5611). Compound 1 has a wide band gap of 2.05 eV, which was revealed by a solid-state UV/Vis diffuse reflection experiment.
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