The Sensitization of Rare Earth Ion Luminescence in Dilute Solutions by [1]Benzopyrano[3,4-c]pyridine-4,5(3H)-dione Derivatives

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Abstract
Luminescence spectra and lifetimes are presented for the rare earth ions sensitized by [1]benzopyrano[3,4-c]pyridine-4,5(3H)-dione derivatives in dilute solutions. It is to be noted that, among the benzopyranopyridine derivatives investigated, 2-phenyl-[1]benzopyrano[3,4-c]pyridine-4,5(3H)-dione brings about the most efficient sensitization for the luminescence of europium and terbium ions. Some discussions are made of the energy-transfer processes from these excited benzopyranopyridine derivatives to terbium ions.