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

T. Asahi*, H. Matsune, K. Yamashita, Hiroshi Masuhara, H. Kasai, H. Nakanishi

*Corresponding author for this work

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)687-699
頁數13
期刊Polish Journal of Chemistry
82
發行號4
出版狀態Published - 1 四月 2008

指紋 深入研究「Size-dependent fluorescence spectra of individual perylene nanocrystals studied by far-field fluorescence microspectroscopy coupled with atomic force microscope observation」主題。共同形成了獨特的指紋。

引用此