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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(11) [November 2011] >
| Title: | Steady state and time resolved methods of fluorescence quenching of three coumarin dyes using S-V plots |
| Authors: | Melavanki, R M
Patil, N R
Patil, H D
Kusanur, R A
Kadadevaramath, J S |
| Keywords: | Fluorescence quenching
Coumarin dyes
Material diffusion
Activation process static
Dynamic quenching |
| Issue Date: | Nov-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Studies of steady
state and time resolved methods of fluorescence quenching of excitation energy
of three coumarin dyes by aniline were carried out in toluene solvent only to
understand the role of diffusion in the quenching mechanism. The coumarin dyes
(dye1, dye2 and dye3) were excited directly by UV radiation of 350 nm and
probabilities of quenching per encounter p (or p') were determined in the toluene solvent. Further, the activation
energy E'a (or E'a) of
quenching was determined using the literature values of activation energy of
diffusion Ed and the experimentally determined values of p
(or p'). Magnitudes of p (or p') as well as the values of Ea (or E'a) suggest
that the quenching reaction is predominantly controlled by material
diffusion. |
| Page(s): | 748-753 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(11) [November 2011]
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