Photoluminescence spectral change in layered titanate oxide intercalated with hydrated Eu3+

Shintaro Ida, Ugur Unal, Kazuyoshi Izawa, Ozge Altuntasoglu, Chikako Ogata, Taishi Inoue, Kenji Shimogawa, Yasumichi Matsumoto

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    30 Citations (Scopus)

    Abstract

    A number of interesting photoluminescence properties of titanate layered oxide intercalated with hydrated Eu3+ have been demonstrated. Photoluminescence intensity of Eu3+ decreased rapidly with time during irradiation by UV light having energy higher than the band gap energy of the host TiO (T1.81.siO4) layer. This is presumably due to the decrease in energy transfer from the host TiO layer to Eu3+ as a result of the change in the hydration state of water molecules surrounding Eu3+, which is caused by the hole produced in the TiO valence band. When irradiation was discontinued, the emission intensity gradually recovered. The recovery time increased when the water in the interlayer is removed by heat treatment. This indicates that the state of interlayer water changes during irradiation and returns to its initial state after discontinuation of irradiation. The excitation spectra changed drastically at any given wavelength upon irradiation with UV light. A comparison of the excitation spectra before and after irradiation reveals that only the excitation peak at around the irradiation wavelength decreased upon irradiation, as in the case of spectral hole burning. The hydration state of water molecules surrounding Eu3+ presumably changes depending on the irradiation wavelength, leading to the above spectral change because the Eu/TiO film has a superlattice structure producing holes with different energies.

    Original languageEnglish
    Pages (from-to)23881-23887
    Number of pages7
    JournalJournal of Physical Chemistry B
    Volume110
    Issue number47
    DOIs
    Publication statusPublished - Nov 30 2006

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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