Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS
Volume 42, Issue 2A, Pages L111-L113Publisher
INST PURE APPLIED PHYSICS
DOI: 10.1143/JJAP.42.L111
Keywords
scanning near-field optical microspectroscopy; perylene nanocrystal; fluorescence spectrum; reprecipitation method; self-trapped exciton; free exciton; size effect
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The fluorescence spectra of perylene nanocrystals, the crystal size of which is in the range of about 300 nm to 1 mum, were measured with the scanning near-field optical microspectroscopy. It has become apparent for the first time that the emission peaks from the self-trapped exciton state were evidently blue-shifted with decreasing crystal size. On the other hand, the emission spectra from the free exciton state were scarcely dependent on crystal size. These spectral changes were discussed semi-quantitatively on the basis of the strong coupling model between excitons and lattice for a molecular crystal. The influence of the substrate was also suggested.
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