Time-resolved fluorescence measurements for dyes in polymer ultrathin films based on guided wave mode excitation

Kouichi Kouka, Keiji Tanaka, Toshihiko Nagamura

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Fluorescence lifetime of Coumarin 153 dispersed in ultrathin films of ARTON-F5023® was examined on the basis of Guided Wave Mode Excitation. The polymer containing dyes was spin-coated onto 150 nm thick-PVA (poly(vinyl alcohol)) film / 35 nm thick silver / glass plate system Mode-locked Ti:sapphire picosecond laser at 440 nm was introduced from the substrate side under the condition that guided wave mode (GWM) excitation was attained. Fluorescence from dyes in the film was detected as a function of time using a streak camera. Once the film became thinner than 100 nm, fluorescence lifetime increased with decreasing thickness, measuring that molecular motion in ultrathin films was depressed in comparison with that in the bulk. This might be because an interfacial effect between ARTON-F5023® and PVA films became dominant over the surface effect, which activates molecular motion. More conclusive discussion will be presented in a poster.

    Original languageEnglish
    Number of pages1
    Publication statusPublished - Oct 18 2006
    Event55th SPSJ Annual Meeting - Nagoya, Japan
    Duration: May 24 2006May 26 2006

    Other

    Other55th SPSJ Annual Meeting
    Country/TerritoryJapan
    CityNagoya
    Period5/24/065/26/06

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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