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Proceedings Paper

New technique to determine exciton bandwidths of the lowest exciton band in aromatic molecular crystals
Author(s): Atsuo H. Matsui; Osamu Nishi; Yoshihiro Matsushima; Ken-ichi Mizuno; Masumi Takeshima; Yoshitaka Oeda; Takenari Goto
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Paper Abstract

A new technique to determine the exciton bandwidths of the lowest exciton bands in aromatic molecular crystals has been developed. This technique is based on the fact that in microcrystallites k is not a good quantum number, allowing the optical transition in whole exciton band states. In anthracene microcrystallites, the exciton band width increases with microcrystallite diameter, reaching its maximum value of 340 cm-1. For microcrystallites larger than 65 A in diameter, the observed bandwidth decreases asymptotically to 300 cm-1, which is interpreted to be the bandwidth of bulk crystal. For the above figures 340 cm-1 and 300-1 strong exciton scattering at microcrystallite surfaces is suggested. The same technique is applied to pyrene microcrystallites. The exciton bandwidth for bulk crystal is estimated to be at most 330 cm-1. With the present results, the excitonic state and exciton relaxation processes in pyrene crystals are understood quite successfully. A brief discussion on the exciton bandwidth of the lowest exciton band in coronene is also given.

Paper Details

Date Published: 25 March 1996
PDF: 7 pages
Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); doi: 10.1117/12.236181
Show Author Affiliations
Atsuo H. Matsui, Konan Univ. (Japan)
Osamu Nishi, Konan Univ. (Japan)
Yoshihiro Matsushima, Konan Univ. (Japan)
Ken-ichi Mizuno, Konan Univ. (Japan)
Masumi Takeshima, Takeshima Lab. (Japan)
Yoshitaka Oeda, New Oji Paper Co., Ltd (Japan)
Takenari Goto, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 2705:
Fluorescence Detection IV
E. Roland Menzel; Abraham Katzir, Editor(s)

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