Abstract
Triplet spectroscopy and energy migration among benzophenone chromophores have been studied in sol-gel matrix under steady state excitation. The energy migration process was observed by the rise of sensitised emission from triplet energy acceptors like, 1,4-dibromonaphthalene and 1-chloronaphthalene after excitation of benzophenone chromophore. The probability of donor excitation energy capture by the trap shows a critical concentration dependence on the benzophenone molecules. The percolation model has been applied to evaluate the critical exponents. The evaluated critical exponents are in very good agreement with three dimensional excitation transport.
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