New technique to determine exciton bandwidths of the lowest exciton band in aromatic molecular crystals

Atsuo H. Matsui; Osamu Nishi; Yoshihiro Matsushima; Ken-ichi Mizuno; Masumi Takeshima; Yoshitaka Oeda; Takenari Goto

doi:10.1117/12.236181

25 March 1996 New technique to determine exciton bandwidths of the lowest exciton band in aromatic molecular crystals

Atsuo H. Matsui, Osamu Nishi, Yoshihiro Matsushima, Ken-ichi Mizuno, Masumi Takeshima, Yoshitaka Oeda, Takenari Goto

Proceedings Volume 2705, Fluorescence Detection IV; (1996) https://doi.org/10.1117/12.236181
Event: Photonics West '96, 1996, San Jose, CA, United States

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.

Citation Download Citation

Atsuo H. Matsui, Osamu Nishi, Yoshihiro Matsushima, Ken-ichi Mizuno, Masumi Takeshima, Yoshitaka Oeda, and Takenari Goto "New technique to determine exciton bandwidths of the lowest exciton band in aromatic molecular crystals", Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); https://doi.org/10.1117/12.236181

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