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Direct Imaging of Light Emission Centers in Two-Dimensional Crystals and Their Luminescence and Photocatalytic Properties^†

Corresponding Author

Prof. Shintaro Ida

[email protected]

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

PRESTO (Japan) Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan)

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)Search for more papers by this author

Shota Koga,

Shota Koga

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Takeshi Daio,

Takeshi Daio

International Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Prof. Hidehisa Hagiwara,

Prof. Hidehisa Hagiwara

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Prof. Tatsumi Ishihara,

Prof. Tatsumi Ishihara

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Prof. Shintaro Ida,

Corresponding Author

Prof. Shintaro Ida

[email protected]

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

PRESTO (Japan) Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan)

Shota Koga,

Shota Koga

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Takeshi Daio,

Takeshi Daio

International Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Prof. Hidehisa Hagiwara,

Prof. Hidehisa Hagiwara

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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Prof. Tatsumi Ishihara,

Prof. Tatsumi Ishihara

International Research Center for Hydrogen Energy, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)

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First published: 09 October 2014

https://doi.org/10.1002/ange.201406638

Citations: 4

^†

This research was supported by JST, PRESTO and JSPS KAKENHI 24685031.

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Abstract

To fully understand the fundamental properties of light-energy-converting materials, it is important to determine the local atomic configuration of photofunctional centers. In this study, direct imaging of one- and two-Tb-atom emission centers in a two-dimensional Tb-doped Ca₂Ta₃O₁₀ nanocrystal was carried. The emission centers were located at the Ca sites in the perovskite structure, and no concentration-based quenching was observed even when the emission centers were in close proximity to each other. The relative photoluminescence efficiency for green emission of the nanosheet suspension was 38.1 %. Furthermore, the Tb-doped Ca₂Ta₃O₁₀ nanocrystal deposited co-catalyst showed high photocatalytic activity for hydrogen production from water (quantum efficiency: 71 % at 270 nm). Tb³⁺ dopants in the two-dimensional crystal might have the potential to stabilize the charge separation state.

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Volume126, Issue48

November 24, 2014

Pages 13294-13298

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Direct Imaging of Light Emission Centers in Two-Dimensional Crystals and Their Luminescence and Photocatalytic Properties^†

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Direct Imaging of Light Emission Centers in Two-Dimensional Crystals and Their Luminescence and Photocatalytic Properties†

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Direct Imaging of Light Emission Centers in Two-Dimensional Crystals and Their Luminescence and Photocatalytic Properties^†