Redox-Responsive Luminescence Switching of CePO4: Tb3+ Thin Films Prepared by a Sol-Gel Method

Yuina Takano, Shinobu Fujihara

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Transparent CePO4:Tb3+ thin films were prepared on silica glass substrates by a sol.gel dip-coating method and their structural and optical properties were investigated in response to redox conditions. CePO 4:Tb3+ was crystallized in a monoclinic monazite structure after heating at 900°C, showing photoluminescence due to doped Tb 3+ ions upon excitation with ultraviolet light. The oxidation of the CePO4:Tb3+ film with an aqueous KMnO4 solution resulted in quenching of luminescence associated with a preferential occurrence of a Ce3+-Ce4+ intervalence charge transfer instead of a Ce3+-Tb3+ energy transfer. The reduction of the once oxidized CePO4:Tb3+ film with an aqueous ascorbic acid solution recovered luminescence completely, thereby providing on/off switching function to the film. The process of quenching and recovery was investigated by following up changes in a chemical and an electronic state using X-ray photoelectron spectroscopy and optical transmission spectroscopy, respectively. It was also shown that the redox sensitivity of luminescence was dependent on controllable parameters such as reaction time, reaction temperature, and concentration of redox reagents. Repetitive on/off cycles of luminescence were achieved under the advantage of chemically stable inorganic materials.

Original languageEnglish
JournalECS Journal of Solid State Science and Technology
Volume1
Issue number6
DOIs
Publication statusPublished - 2012

Fingerprint

Sol-gel process
Luminescence
Thin films
Quenching
Monazite
Switching functions
Ascorbic acid
Electronic states
Polymethyl Methacrylate
Fused silica
Light transmission
Sols
Energy transfer
Ascorbic Acid
Charge transfer
Structural properties
Photoluminescence
Gels
X ray photoelectron spectroscopy
Optical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Redox-Responsive Luminescence Switching of CePO4: Tb3+ Thin Films Prepared by a Sol-Gel Method",
abstract = "Transparent CePO4:Tb3+ thin films were prepared on silica glass substrates by a sol.gel dip-coating method and their structural and optical properties were investigated in response to redox conditions. CePO 4:Tb3+ was crystallized in a monoclinic monazite structure after heating at 900°C, showing photoluminescence due to doped Tb 3+ ions upon excitation with ultraviolet light. The oxidation of the CePO4:Tb3+ film with an aqueous KMnO4 solution resulted in quenching of luminescence associated with a preferential occurrence of a Ce3+-Ce4+ intervalence charge transfer instead of a Ce3+-Tb3+ energy transfer. The reduction of the once oxidized CePO4:Tb3+ film with an aqueous ascorbic acid solution recovered luminescence completely, thereby providing on/off switching function to the film. The process of quenching and recovery was investigated by following up changes in a chemical and an electronic state using X-ray photoelectron spectroscopy and optical transmission spectroscopy, respectively. It was also shown that the redox sensitivity of luminescence was dependent on controllable parameters such as reaction time, reaction temperature, and concentration of redox reagents. Repetitive on/off cycles of luminescence were achieved under the advantage of chemically stable inorganic materials.",
author = "Yuina Takano and Shinobu Fujihara",
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N2 - Transparent CePO4:Tb3+ thin films were prepared on silica glass substrates by a sol.gel dip-coating method and their structural and optical properties were investigated in response to redox conditions. CePO 4:Tb3+ was crystallized in a monoclinic monazite structure after heating at 900°C, showing photoluminescence due to doped Tb 3+ ions upon excitation with ultraviolet light. The oxidation of the CePO4:Tb3+ film with an aqueous KMnO4 solution resulted in quenching of luminescence associated with a preferential occurrence of a Ce3+-Ce4+ intervalence charge transfer instead of a Ce3+-Tb3+ energy transfer. The reduction of the once oxidized CePO4:Tb3+ film with an aqueous ascorbic acid solution recovered luminescence completely, thereby providing on/off switching function to the film. The process of quenching and recovery was investigated by following up changes in a chemical and an electronic state using X-ray photoelectron spectroscopy and optical transmission spectroscopy, respectively. It was also shown that the redox sensitivity of luminescence was dependent on controllable parameters such as reaction time, reaction temperature, and concentration of redox reagents. Repetitive on/off cycles of luminescence were achieved under the advantage of chemically stable inorganic materials.

AB - Transparent CePO4:Tb3+ thin films were prepared on silica glass substrates by a sol.gel dip-coating method and their structural and optical properties were investigated in response to redox conditions. CePO 4:Tb3+ was crystallized in a monoclinic monazite structure after heating at 900°C, showing photoluminescence due to doped Tb 3+ ions upon excitation with ultraviolet light. The oxidation of the CePO4:Tb3+ film with an aqueous KMnO4 solution resulted in quenching of luminescence associated with a preferential occurrence of a Ce3+-Ce4+ intervalence charge transfer instead of a Ce3+-Tb3+ energy transfer. The reduction of the once oxidized CePO4:Tb3+ film with an aqueous ascorbic acid solution recovered luminescence completely, thereby providing on/off switching function to the film. The process of quenching and recovery was investigated by following up changes in a chemical and an electronic state using X-ray photoelectron spectroscopy and optical transmission spectroscopy, respectively. It was also shown that the redox sensitivity of luminescence was dependent on controllable parameters such as reaction time, reaction temperature, and concentration of redox reagents. Repetitive on/off cycles of luminescence were achieved under the advantage of chemically stable inorganic materials.

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