Order and disorder around Cr3+ in chromium doped persistent luminescent AB2O4 spinels
文献信息
Neelima Basavaraju, Kaustubh R. Priolkar, Didier Gourier, Aurélie Bessière, Bruno Viana
The X-ray absorption near edge structure (XANES) spectroscopy technique is used to better understand the charging and decharging processes of the persistent luminescence in the Cr3+doped AB2O4 spinels (A = Zn, Mg and B = Ga and Al) with low photon energy excitation by visible light. Cr K edge XANES spectra have been simulated for different near neighbour environments around the Cr3+ recombination centres and compared with the experimental curve. In the Cr3+:ZnGa2O4 compound, the Cr3+ local structure corresponds mostly to that of a normal spinel (∼70%), while the rest comprises of a distorted octahedral environment arising from cationic site inversion and a contribution from chromium clustering. This local structure is considerably different in Cr3+:MgGa2O4 and Cr3+:ZnAl2O4, where, for both cases, chromium clustering represents the main contribution. The strong correlation between the intensity of persistent luminescence and the percentage of Cr in clusters leads us to infer that the presence of Cr clusters is responsible for the decrease of the intensity of the visible light induced persistent luminescence in the Cr3+ doped AB2O4 spinels.
期刊推荐

Russian Journal of Organic Chemistry

Chemical Communications

Current Opinion in Solid State & Materials Science

Crystallography Reports

Russian Journal of Bioorganic Chemistry

Drug Discovery Today

Organic Process Research & Development

Acta Materialia

Current Opinion in Colloid & Interface Science

Russian Journal of General Chemistry
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
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