| Autor: |
Jeevaraj, M., Devendran, P., Nallamuthu, N., Sudhahar, S., Kumar, M. Krishna |
| Zdroj: |
Journal of Materials Science: Materials in Electronics; Jan2023, Vol. 34 Issue 1, p1-8, 8p |
| Abstrakt: |
Lead free double perovskites have emerged as a highly stable alternatives to organic–inorganic halide perovskites in recent years. In this work, we have successfully endowed weakly luminescent Cs2AgBiCl6 double perovskite with strong red luminescence by incorporating Mn2+ in their lattices. It was also observed that the intensity of red emission increased with increase in Mn2+ concentration. Electron paramagnetic resonance (EPR) and energy dispersive X ray spectroscopy manifest the presence of isolated Mn2+ ions in Cs2AgBiCl6. The obtained hyperfine coupling constant of 90 Gauss from EPR spectra also confirms the octahedral coordination of Mn2+ ions. Scanning electron micrographs of pure and Mn2+ doped Cs2AgBiCl6 exhibit octahedral particles. X-ray diffraction patterns of different concentration of Mn2+ in Cs2AgBiCl6 reveals that all samples crystallize in face centred cubic structure with Fm 3 - m symmetry. The crystallite size and lattice strain were found to increase with increase in Mn2+ concentration. Detailed changes in structural parameters of Cs2AgBiCl6 upon Mn2+ doping evaluated using rietveld refinement of XRD spectra indicates a linear decrease in unit cell volume. Raman spectra measurements which divulges a decrease in Ag–Cl and Bi–Cl octahedral volume on introducing smaller size Mn2+ ion which leads to the overall decrease of unit cell volume. Thermal gravimetric analysis discloses that the Mn2+:Cs2AgBiCl6 double perovskites are stable upto 520 °C. This work demonstrates an easy way of tuning the photophysical properties of Cs2AgBiCl6 by transition metal doping and can widen their application prospects in optoelectronics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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