Picosecond near-field microspectroscopic study of a single anthracene microcrystal in evaporated anthracene-tetracene film: Inhomogeneous inner structure and growth mechanism

Citation
H. Yoshikawa et al., Picosecond near-field microspectroscopic study of a single anthracene microcrystal in evaporated anthracene-tetracene film: Inhomogeneous inner structure and growth mechanism, J PHYS CH B, 104(15), 2000, pp. 3429-3437
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
1520-6106 → ACNP
Volume
104
Issue
15
Year of publication
2000
Pages
3429 - 3437
Database
ISI
SICI code
1520-6106(20000420)104:15<3429:PNMSOA>2.0.ZU;2-W
Abstract
Topographies, fluorescence images, fluorescence spectra, and fluorescence d ecay curves of anthracene-tetracene two-component evaporated films were obs erved by ps near-field fluorescence microspectroscopy. Individual anthracen e microcrystals were formed on tetracene microcrystalline films, although l ayer-on-layer film was expected. It is interesting to note that the central part of individual anthracene microcrystals shows intense tetracene monome r fluorescence, while edge parts give relatively weak fluorescence. This me ans that energy transfer from anthracene to tetracene took place more prefe rably in the central part of the anthracene crystal than in the surrounding area. This inhomogeneity cannot be simply explained as an energy transfer at interface between anthracene and tetracene crystals. The characteristic position dependence of energy transfer dynamics implied special crystal gro wth and molecular diffusion mechanisms under the present sample preparation .