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IJC-A Vol.47A [2008] >
IJC-A Vol.47A(11) [November 2008] >


Title: Structural and photophysical aspects of perylene- doped anthracene crystalline powders prepared by microwave heating
Authors: Gharge, M N
Bhattar, S L
Kolekar, G B
Patil, S R
Issue Date: Nov-2008
Publisher: CSIR
IPC CodeInt. Cl. ⁸ : C05B6/64; C09K11/06
Abstract: The microwave assisted polycrystalline luminophors of anthracene have been prepared by addition of varying amounts of perylene dopant. The crystallanity and homogeneity of mixed crystals have been examined by scanning electron microscopy. The structural parameters such as grain size, microstrain, dislocation density and stacking fault in mixed crystal growth have been estimated as a function of perylene concentration. The mixed crystalline powders are fine grained. Increase in stacking fault indicates closely packed stacked structure of perylene-doped anthracene. The fluorescence studies show quenching of monomer fluorescence of anthracene by perylene dopant. Higher concentration of perylene generates exciplex in the excited state, which is observed in the form of a broad, structureless, red shifted band. The fluorescence quenching and exciplex formation have been explained on the basis of excitation energy transfer and molecular interaction between anthracene and perylene. The fluorescence characteristics of mixed crystals are described using Stern-Volmer kinetics. The fluorescence results are correlated with structural parameters.
Page(s): 1642-1648
ISSN: 0376-4710
Source:IJC-A Vol.47A(11) [November 2008]

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