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Large temperature tuning of the emission color of a phosphor by dual use of Raman and photoluminescence signals

De, A and Ranjan, R (2020) Large temperature tuning of the emission color of a phosphor by dual use of Raman and photoluminescence signals. In: Materials Horizons, 7 (4). pp. 1101-1105.

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Official URL: https://doi.org/10.1039/c9mh01796h


The ability to tune the emission color of materials by external stimuli like electric field, pressure, temperature, etc., offers avenues to design light-based sensors and devices. We report here a new strategy which enables large temperature tuning of the emission color of a lanthanide phosphor by combining Raman and photoluminescence (PL) signals. The phenomenon and the associated mechanism, demonstrated on Eu, Er doped BaTiO3, shows the emission color to change from orange to green when cooled down to 10 K. The large color tuning is a consequence of synergy of the two processes: (i) significant enhancement of the Raman signal due to gradual structural ordering in the rhombohedral ferroelectric phase of the host BaTiO3 and (ii) anomalous low temperature quenching of the PL emission of the doped Eu3+ by trap states. We show that this contrasting temperature effect on the PL and the Raman signals can be used as a powerful strategy to design phosphor materials for high performance optical thermometry. © 2020 The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Materials Horizons
Publisher: Royal Society of Chemistry
Additional Information: Copyright of this article belongs to Royal Society of Chemistry
Keywords: Barium titanate; Color; Electric fields; Phosphors; Photoluminescence; Raman spectroscopy; Temperature, Associated mechanism; External stimulus; Ferroelectric phase; Optical thermometry; Phosphor materials; Photoluminescence signals; Structural ordering; Temperature tuning, Tuning
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Apr 2021 06:57
Last Modified: 23 Apr 2021 06:57
URI: http://eprints.iisc.ac.in/id/eprint/65224

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