Abstract
Neodymium and praseodymium ions, singly and in combination, have been doped into a poly(vinyl alcohol)–borax matrix. X-ray diffraction shows structural correlations from 2 to 6 Å and 15 Å, while small angle neutron scattering indicates that the rare-earth ions do not affect the nanoscale structures of the gels. Differential scanning calorimetry shows the glass transition temperature to increase with concentration of Pr in the gel. Excitation in the ultraviolet region leads to luminescent emission in the visible region. Simultaneous absorption in the visible region then leads to luminescent emission in the near infra-red region. The spectral qualities of the emission bands can be varied by choosing appropriate relative ratios of rare-earth species.
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Acknowledgements
The authors are grateful to UGC-DAE-CSR for funding this work and providing access to the neutron beam facilities at Dhruva Reactor, through the aegis of its Collaborative Research Project (CRS-M-149). Dr M V Badiger, National Chemical Laboratory, Pune, is thanked for his assistance with the rheological measurements.
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LAWRENCE, M.B., DESA, J., ASWAL, V. et al. Properties of poly(vinyl alcohol)–borax gel doped with neodymium and praseodymium. Bull Mater Sci 37, 301–307 (2014). https://doi.org/10.1007/s12034-014-0657-2
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DOI: https://doi.org/10.1007/s12034-014-0657-2