Photoluminescence and semiconductor properties of two novel lanthanide-mercury compounds with one-dimensional chain-like structures
- School of Materials Science and Engineering&School of Chemistry, Nanchang University, Nanchang, Jiangxi 330000 (China)
- Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Jiangxi Province Key Laboratory of Coordination Chemistry, Jinggangshan University, Ji’an, Jiangxi 343009 (China)
Highlights: • This paper reports two novel lanthanide-mercury compounds with 1D chain. • Diffuse reflectance spectroscopy reveals that they have wide optical band gaps. • One shows red photoluminescence which is assigned to the {sup 5}D{sub 0} → {sup 7}F{sub J} (Eu{sup 3+}). • The other shows green photoluminescence which is assigned to the {sup 5}D{sub 4} → {sup 7}F{sub J} (Tb{sup 3+}). • Energy transfer mechanism is explained by the energy level diagram. - Abstract: Two novel lanthanide-mercury compounds [Ln(IA){sub 3}(H{sub 2}O){sub 2}]{sub n}(Hg{sub 3}Cl{sub 9}){sub n}·4nH{sub 2}O (Ln = Eu (1) and Tb (2); IA = isonicotinic acid) have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Both complexes exhibit one-dimensional (1D) chain-like structure with a novel isolated (Hg{sub 3}Cl{sub 9}){sup 3-} anion. Solid-state diffuse reflectance spectroscopy reveals the presence of wide optical band gaps of 2.81 eV and 3.47 eV, suggesting that they are potentially wide band gap organic semiconductor materials. Solid-state photoluminescence measurements uncover that they show red or green light emission bands, respectively. The emission bands can be assigned to the characteristic emission of the 4f electrons intrashell transitions of {sup 5}D{sub 0} → {sup 7}F{sub J} (Eu{sup 3+}, J = 2 and 4) and {sup 5}D{sub 4} → {sup 7}F{sub J} (Tb{sup 3+}, J = 6, 5, 4 and 3), respectively. Energy transfer mechanism is explained by the energy level diagram of Eu{sup 3+} ion, Tb{sup 3+} ion and isonicotinic acid ligand. The title compounds have remarkable CIE chromaticity coordinates of (0.6438, 0.3559) and (0.3172, 0.4773). This suggests that they may be potential candidates with red or green light emitting materials for white light emitting diodes (LEDs).
- OSTI ID:
- 22890228
- Journal Information:
- Journal of Solid State Chemistry (Print), Vol. 266; Other Information: © 2018 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- Netherlands
- Language:
- English
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