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Excimer and monomer emission of pyrene crystals associated with the phase transition

✍ Scribed by Kenji Uchida; Yoshihiro Takahashi

Book ID: 104579902
Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 188 KB
Volume: 18
Category: Article
ISSN: 0020-7608
DOI: 10.1002/qua.560180142

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✦ Synopsis

Abstract

Emission spectra and decay times of the fluorescence under the excitation of various energies were measured in pyrene crystals. At liquid nitrogen temperature, a new excimer emission was found under 390 nm excitation, and its peak shifts a little to the high energy in comparison with that of the familiar excimer. The decay time of the former emission abruptly changes around 125°K, which seems to be due to the phase transition in pyrene crystals. Also, when the crystals were rapidly cooled below 125°K, the monomer emission in the crystals was observed, and its decay time was about 600 nsec.

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