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Title: Effect of polar dopants on structure of emission spectrum of crystalline anthracene powders
Authors: Gharge, M N
Bhattar, S L
Kolekar, G B
Patil, S R
Keywords: Fluorescence
Emission spectra
Polar dopants
Spectral shifts
Oscillatory transitions
Issue Date: Oct-2009
Publisher: CSIR
IPC CodeInt. Cl.9 G01N21/64
Abstract: The effect of polar dopants on the spectral properties of crystalline anthracene is studied as a function of concentration by steady state fluorescence spectroscopy. The dopant is a fluorescent 9-vinylanthracene. The incorporation of the dopant not only quenches the fluorescence but also changes the structure of emission of anthracene. The higher dopant concentration induces significant enhancement in the intensity of low energy (0←1) vibronic band at the expense of high energy (0←0) band and wavelength of maximum emissions is shifted from 427 nm to 446 nm. The characteristic monomer and excimer emission of dopant are not observed even at higher concentration in the fluorescence spectra of doped anthracene. This observation rules out the possibility of excitation energy transfer from anthracene to dopant molecule. The shift in structure of emission of anthracene has been attributed to the local electric field generated by the polar dopant which is acting across the anthracene molecule and induces the changes both in the molecular vibrational levels and in transition dipoles. This effect is similar to solid state solvation effect and favors transition to the higher vibrational level of the ground state.
Page(s): 1383-1387
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.48A(10) [October 2009]

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