Size-dependent fluorescence spectra of individual perylene nanocrystals studied by far-field fluorescence microspectroscopy coupled with atomic force microscope observation

T. Asahi, Hideki Matsune, K. Yamashita, H. Masuhara, H. Kasai, H. Nakanishi

Research output: Contribution to journalArticle

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Abstract

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 wavelength 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 crystalline 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.

Original languageEnglish
Pages (from-to)687-699
Number of pages13
JournalPolish Journal of Chemistry
Volume82
Issue number4
Publication statusPublished - Apr 1 2008

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Perylene
Nanocrystals
Microscopes
Fluorescence
Nanoparticles
Crystals
Quantum confinement
Fluorescence spectroscopy
Elastic constants
Crystal lattices
Anisotropy
Monomers
Crystalline materials
Wavelength

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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Size-dependent fluorescence spectra of individual perylene nanocrystals studied by far-field fluorescence microspectroscopy coupled with atomic force microscope observation. / Asahi, T.; Matsune, Hideki; Yamashita, K.; Masuhara, H.; Kasai, H.; Nakanishi, H.

In: Polish Journal of Chemistry, Vol. 82, No. 4, 01.04.2008, p. 687-699.

Research output: Contribution to journalArticle

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AU - Asahi, T.

AU - Matsune, Hideki

AU - Yamashita, K.

AU - Masuhara, H.

AU - Kasai, H.

AU - Nakanishi, H.

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N2 - 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 wavelength 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 crystalline 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.

AB - 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 wavelength 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 crystalline 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.

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