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Photochemical fine-tuning of luminescent color of cadmium selenide nanoparticles : fabricating a single-source multicolor luminophore

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Title: Photochemical fine-tuning of luminescent color of cadmium selenide nanoparticles : fabricating a single-source multicolor luminophore
Authors: Torimoto, Tsukasa Browse this author →KAKEN DB
Murakami, Shinya Browse this author
Sakuraoka, Miwa Browse this author
Iwasaki, Kentaro Browse this author
Okazaki, Kenichi Browse this author
Shibayama, Tamaki Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Issue Date: 13-Jul-2006
Publisher: American Chemical Society
Journal Title: Journal of physical chemistry. B
Volume: 110
Issue: 27
Start Page: 13314
End Page: 13318
Publisher DOI: 10.1021/jp062645c
Abstract: Size-selective photoetching was applied to silica-coated cadmium selenide (SiO2/CdSe) nanoparticles to precisely control their photoluminescence properties. The absorption spectra of CdSe was blue-shifted by irradiation of monochromatic light, and finally, the absorption onset agreed with the wavelength of irradiation light, indicating that CdSe particles were photoetched to smaller ones until the irradiated photons were not absorbed by the photoetched particles and that the SiO2 shell layer surrounding the CdSe core prevented coalescence between the photoetched particles. Although as-prepared SiO2/CdSe did not exhibit photoluminescence, the application of size-selective photoetching to SiO2/CdSe resulted in the development of the band gap emission, with the degree being enhanced with progress of the photoetching. The peak wavelength of photoluminescence decreased with a decrease in the wavelength used for the photoetching, so that the luminescence color could be tuned between red and blue. Partial photoetching of SiO2/CdSe nanoparticle films produced intense band gap emission of CdSe at the photoetched area, while the remainder of the SiO2/CdSe films did not exhibit detectable photoluminescence, resulting in the formation of a clear photoluminescence image under UV irradiation. This technique makes it possible to produce a multicolored photoluminescence image by irradiation with monochromatic lights having various wavelengths using a single source material.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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