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Upconversion based near white light emission, intrinsic optical bistability and temperature sensing in Er3+/Tm3+/Yb3+/Li+: NaZnPO4 phosphors

Abstract

NaZnPO4: Er3+/Tm3+/Yb3+/Li+ phosphors successfully synthesized by conventional solid state reaction method have been characterized through XRD, FESEM, EDAX, diffuse reflectance spectra and FTIR analysis. Downconversion (DC) and upconversion (UC) emission study of developed phosphors have been carried out and the dynamics involved in the UC emission mechanism discussed. UC based near white light emission, intrinsic optical bistability and temperature dependent population re-distribution ability have been reported. The UC emission intensity of the blue, green and red bands is enhanced about ~ 333, ~ 86 and ~ 2 times respectively on codoping with Yb3+ ions whereas, the green and red UC emission band is enhanced by ~130 and ~7 times respectively on codoping with Li+ ions as compared to that of the Er3+- Tm3+ co-doped phosphors. Photometric characterization confirms the near white light emission from the developed phosphors. Nature of interaction for the concentration quenching is found to be dipole-dipole type. Time dependent intensity ratio arising from the Er3+ ions do not vary which shows that the developed material can be used in making the thermally stable probe.

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Publication details

The article was received on 11 May 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ01622K
Citation: New J. Chem., 2017, Accepted Manuscript
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    Upconversion based near white light emission, intrinsic optical bistability and temperature sensing in Er3+/Tm3+/Yb3+/Li+: NaZnPO4 phosphors

    V. Rai and L. Mukhopadhyay, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01622K

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