Triplet-triplet energy transfer from a UV-A absorber butylmethoxydibenzoylmethane to UV-B absorbers

Azusa Kikuchi, Nozomi Oguchi-Fujiyama, Kazuyuki Miyazawa, Mikio Yagi

    • 6 Citations

    Abstract

    The phosphorescence decay of a UV-A absorber, 4-tert-butyl-4- methoxydibenzolymethane (BMDBM) has been observed following a 355 nm laser excitation in the absence and presence of UV-B absorbers, 2-ethylhexyl 4-methoxycinnamate (octyl methoxycinnamate, OMC) and octocrylene (OCR) in ethanol at 77 K. The lifetime of the lowest excited triplet (T1) state of BMDBM is significantly reduced in the presence of OMC and OCR. The observed quenching of BMDBM triplet by OMC and OCR suggests that the intermolecular triplet-triplet energy transfer occurs from BMDBM to OMC and OCR. The T1 state of OCR is nonphosphorescent or very weakly phosphorescent. However, we have shown that the energy level of the T 1 state of OCR is lower than that of the enol form of BMDBM. Our methodology of energy-donor phosphorescence decay measurements can be applied to the study of the triplet-triplet energy transfer between UV absorbers even if the energy acceptor is nonphosphorescent. In addition, the delayed fluorescence of BMDBM due to triplet-triplet annihilation was observed in the BMDBM-OMC and BMDBM-OCR mixtures in ethanol at 77 K. Delayed fluorescence is one of the deactivation processes of the excited states of BMDBM under our experimental conditions. The intermolecular triplet-triplet energy transfer from 4-tert-butyl-4-methoxydibenzolymethane (BMDBM) to octocrylene (OCR) has been observed by measuring the phosphorescence decay of BMDBM following a 355 nm laser excitation. The lifetime of the lowest excited triplet state of BMDBM is significantly reduced in the presence of OCR. Our methodology of energy-donor phosphorescence decay measurements can be applied to the study of the triplet-triplet energy transfer between UV absorbers even if the energy acceptor is nonphosphorescent. © 2014 The American Society of Photobiology.

    Original languageEnglish
    Pages (from-to)511-516
    Number of pages6
    JournalPhotochemistry and Photobiology
    Volume90
    Issue number3
    DOIs
    StatePublished - 2014

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    Energy Transfer
    Luminescent Measurements
    Lasers
    Ethanol
    Fluorescence

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Biochemistry
    • Medicine(all)

    Cite this

    Triplet-triplet energy transfer from a UV-A absorber butylmethoxydibenzoylmethane to UV-B absorbers. / Kikuchi, Azusa; Oguchi-Fujiyama, Nozomi; Miyazawa, Kazuyuki; Yagi, Mikio.

    In: Photochemistry and Photobiology, Vol. 90, No. 3, 2014, p. 511-516.

    Research output: Contribution to journalArticle

    Kikuchi, Azusa; Oguchi-Fujiyama, Nozomi; Miyazawa, Kazuyuki; Yagi, Mikio / Triplet-triplet energy transfer from a UV-A absorber butylmethoxydibenzoylmethane to UV-B absorbers.

    In: Photochemistry and Photobiology, Vol. 90, No. 3, 2014, p. 511-516.

    Research output: Contribution to journalArticle

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    AU - Yagi,Mikio

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