Abstract
Structural and optoelectronic features as well as influence of local symmetry due to inclusion of dopants are being reported for nanoscale Eu3+: Gd2O3 systems with alkali metal ion (Na+, K+) co-doping. The origin of red emission (~612 nm) as mediated by specific D–F transitions and nature of local symmetry are discussed. The co-doped nanosystems were synthesized following a citrate-gel route and a hydrothermal route as for nanoparticles (EuGNP) and nanorods (EuGNR), respectively. Revealing cubic crystal structure, X-ray diffractometer results also convey incorporation of the dopants into the host matrix, while the transmission electron microscopy images endorse formation of nearly spherical nanoparticles and nanorods. Photoluminescence responses exhibit augmentation in the emissions for the co-doped phosphors with the intensity ratio between the most intense electrically driven red emission at ~612 nm (5D0 → 7F2) to be four-fold stronger than the magnetically driven orange emission ~590 nm (5D0 → 7F1) in the case of Na+ co-doped EuGNP system. Along with comparative emission intensity and line widths, the anomalous trend in emission feature of Na+ co-doped EuGNR has also been discussed.
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Acknowledgements
We extend our sincere thanks to the SAIC, TU, for extending TEM facility. We also thank UGC-DAE CSR Kolkata Centre, for their help and support in TR-PL data acquisition. One of the authors (AA) thank Tezpur University for providing support under Research & Innovation Grant. The help and assistance received from the peers and colleagues are acknowledged.
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Ansari, A., Dey, S. & Mohanta, D. Significant red-luminescence from citrate-gel and hydrothermally derived nanoscale Eu3+: Gd2O3 with alkali metal ion (Na+, K+) co-doping. Bull Mater Sci 45, 21 (2022). https://doi.org/10.1007/s12034-021-02592-2
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DOI: https://doi.org/10.1007/s12034-021-02592-2