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Redox-induced dual optical switching of CaTiO3:Pr3+ phosphor nanoparticles synthesized by sol–gel method

  • Invited Paper: Sol–gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

Red-emitting CaTiO3:Pr3+ phosphor nanoparticles were synthesized by a sol–gel method with a final heat treatment at a low temperature of 650 °C. For comparison, the CaTiO3:Pr3+ phosphor was also synthesized by a conventional solid-state reaction method conducted at 1250 °C. The two kinds of resultant CaTiO3:Pr3+ samples were revealed to differ largely in their microstructure and optical properties. Diffuse reflectance and photoluminescence measurements suggested that the sample from the solid-state reaction possessed a larger number of defects, which would deteriorate the optical properties, due to heating at high temperature. On the other hand, the sol–gel-derived sample exhibited much better optical properties and thus it was used for evaluating optical-switching phenomena upon redox treatments. In photoluminescence, three excitation bands were observed at 265, 335, and 375 nm for the red emission of the CaTiO3:Pr3+ sample, and one of them (375 nm) was more effective for inducing luminescence quenching by a reduction treatment at room temperature. A body color of the CaTiO3:Pr3+ sample was also changed from white to light yellow by the reduction due to the enhanced visible-light absorption. Such the dual luminescence/absorption switching was shown to be reversible with a subsequent oxidation and repeatable with a consecutive redox treatment.

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Highlights

  • CaTiO3:Pr3+ phosphor nanoparticles were synthesized at low temperature by a sol–gel method.

  • The nanoparticles showed more stable photoluminescence than larger particles obtained by a solid-state reaction method.

  • Photoluminescence intensity of the nanoparticles was responsive to redox treatments at room temperature.

  • A body color of the nanoparticles was also responsive to redox treatments, resulting in dual luminescence/absorption switching.

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Funding

This study was supported by Nippon Sheet Glass Foundation for Materials Science and Engineering and JSPS KAKENHI Grant Number JP20K05670.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223–8522, Japan

    Hideaki Takahashi, Manabu Hagiwara & Shinobu Fujihara

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  1. Hideaki Takahashi
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  2. Manabu Hagiwara
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  3. Shinobu Fujihara
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Correspondence to Shinobu Fujihara.

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Takahashi, H., Hagiwara, M. & Fujihara, S. Redox-induced dual optical switching of CaTiO3:Pr3+ phosphor nanoparticles synthesized by sol–gel method. J Sol-Gel Sci Technol 104, 694–701 (2022). https://doi.org/10.1007/s10971-022-05791-3

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  • DOI: https://doi.org/10.1007/s10971-022-05791-3

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