Fluorescence studies on photo-induced structure changes in purified biphenyl crystals

• Published in: Journal of the Physical Society of Japan Vol. 68; no. 1; pp. 284 - 287
• Main Authors: LIU, X.-H, SATOH, N, KUDO, G.-I, ABE, K, SHIGENARI, T, NARISAWA, T
• Format: Journal Article
• Language: English
• Published: Tokyo Institute of Pure and Applied Physics 01-01-1999; Physical Society of Japan; The Physical Society of Japan
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Solid organic materials; Crystals; Photoluminescence; Fluorescence; Excited states; Experimental study; Luminescence decay; Fine structure; Excitons; Impurities; Excimers; Laser radiation; Biphenyl; Excitation spectrum; Organic compounds
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/JPSJ.68.284

Fluorescence spectra of pure biphenyl crystals were measured over a wide temperature range. In contrast to the sharp peaks near 530, nm observed in crystals grown from methyl alcohol solution, a new broad band around 500, nm was found in zone-refined crystals at 5.0, K when the intense exciting laser was employed. From the temperature dependent behavior and the fluorescence decay characters, it is suggested that the new excimer-like band is related to photo-induced structural deformation in biphenyl crystals.