Electronic excitation energy quenching of PPD by $CCl_4$ in different solvents

  • Biradar, D.S. (Department of Physics, Gulbarga University) ;
  • Thipperudrappa, J. (Department of Physics, Gulbarga University) ;
  • Hanagodimath, S.M. (Department of Physics, Gulbarga University)
  • 발행 : 2005.04.01

초록

The electronic excitationenergy quenching of 2, 5-diphenyl-1, 3, 4-oxadiazole (PPD) by Carbon tetrachloride ($CCl_4$) in different solvents viz, n-hexane, n-heptane, toluene, benzene, cyclohexane, 1, 4- dioxane has been carried out at room temperature to understand the role of quenching mechanism. The Stern-Volmer plots have been found to be linear. As probability of quenching per encounter 'p' is less than unity, and the activation energy for quenching '$E_a$' is greater than the activation energy of diffusion '$E_d$', it is inferred that the fluorescence quenching mechanism is not due to material diffusion alone.

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