Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 4, Issue 6, Pages S258-S260Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/4/6/363
Keywords
absorption; fluorescence; bifluorene; microcrystals
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Optical properties of 2, 2'-(9, 9-dihexyl) bifluorene bulk crystal and microcrystals embedded in thin sol-gel films are reported. Reflection spectroscopy and Kramers-Kronig analysis are used to derive the absorption spectrum of the bulk crystal. The absorption and emission spectra obtained for the bulk crystal, microcrystals and molecules in dilute solution are very similar. Due to the perpendicular arrangement of molecules in the crystal structure, intermolecular interactions in the crystal phase are weak and have no significant effect on the electronic transitions of luminescent dye. Thus, the crystal phase has a high blue fluorescence efficiency and appears to provide the basis for a convenient approach to overcoming the aggregation tendency that degrades the electroluminescence properties of fluorene-based oligomers and polymers.
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