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|Title:||Tuning of wavelength of exciplex emission of pyrene and perylene in fluorene matrix|
|Authors:||Pujari, S R|
Jadhav, S A
Patil, S R
|Abstract:||The exciplex emission of pyrene and perylene has been studied systematically in fluorene matrix. The fluorescent fluorene act as energy donor. The fluorescence spectra of mixed stack crystals of fluorene are recorded on spectrofluorometer by monitoring the excitation wavelength at 363 nm. Addition of 10-1 mol pyrene and 10-1 mol perylene quenches the structured monomeric emission of fluorene and new structureless emission band appear at a wavelength 510nm. The broad band is attributed to the emission arising from the exciplex formed between pyrene and perylene. The observed emission does not correspond to the pyrene-perylene exciplex emission without fluorene matrix. It is believed that the varying degree of molecular overlapping changes the wavelength of exciplex emission of pyrene and perylene. Systematic variation of concentration of pyrene and perylene in fluorene matrix has given mixed stack crystals of fluorine having molecular overlapping of different degrees. The fluorescence spectra of these mixed crystals of fluorene show exciplex emissions at different wavelengths in the range 485-560 nm. The tuning of exciplex emission wavelength is possible by controlling concentration of pyrene and perylene in fluorene matrix.|
|Appears in Collections:||IJC-A Vol.40A(09) [September 2001]|
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