Size-dependent Fluorescence Spectra of Individual Perylene Nanocrystals Studied by Far-Field Fluorescence Microspectroscopy Coupled with Atomic Force Microscope Observation

• Autorzy: Asahi T. , Matsune H. , Yamashita K. , Masuhara H. , Kasai H. , Nakanishi H.
• Języki publikacji: EN

Abstrakty

EN

Single particle fluorescence spectroscopy coupled with AFM observation is reported for perylene nanocrystals. Fluorescence spectral measurement for individual nanocrystals with the size from 100 nm to 500 nm and fluorescence anisotropy analysis demonstrate that the size dependence in fluorescence is in the intrinsic nature of nanometer-sized crystal of perylene. Single nanoparticle fluorescence shows the enhanced monomer (M-) emission compared to the bulk crystal and a blue-shift of excimer (E-) emission peak wave length by decreasing the nanoparticle size. It is found for the first time that the size dependence is correlated well to the surface-to-volume ratio of nanocrystal. The size-dependent fluorescence is not attributed to a quantum confinement effect of exciton, but to a change in the elastic properties of nanocrystal with size, which in turn affects excimer formation. We discuss the decrease in elastic constant of crystal-line lattice due to large surface-to-volume ratio, and propose an empirical formula on the size-dependence of E-emission peak in the framework of the strong coupling model of exciton-phonon interaction.

Słowa kluczowe

EN

organic nanocrystal; perylene; single particle spectroscopy; fluorescence spectroscopy; size dependence

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2008
• Tom: Vol. 82, nr 4
• Strony: 687--699
• Opis fizyczny: Bibliogr. 53 poz., rys.

Twórcy

autor

Asahi T.

autor

Matsune H.

autor

Yamashita K.

autor

Masuhara H.

autor

Kasai H.

autor

Nakanishi H.

• Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan Tel: [phone], Fax: [phone],

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