Patent ID: 6413655
Filing Date: 2002-07-02
Classification: C07D,C09B,C09K,Y10S

Abstract:
A composition comprising:(a) an effective amount of a guest chromophore embedded in a matrix of a host chromophore, or (b) a host chromophore and an effective amount of a guest chromophore both embedded in a polymer matrix, wherein the absorption spectrum of the guest chromophore overlaps with the fluorescence emission spectrum of the host chromophore, and wherein overlap means â€œspectral overlapsâ€  defined by the following integral S=âˆ«O+âˆžÆ’F(&ngr;)Æ’A(&ngr;)d&ngr; where Æ’F(&ngr;) is normalized, so that âˆ«O+âˆ«Æ’F(&ngr;) d&ngr; is equal to fluorescence quantum yield of the host, and where &ngr; is the wave number, Æ’F the fluorescence spectrum of the host measured in quanta, and Æ’A the spectral distribution of the molar exyinction coefficient of the guest, and wherein the guest chromophore is luminescent in the molecular state and selected from the group consisting of N,Nâ€²-dibenzyl-quinacridone and N,Nâ€²-dibenzyl-diphenyl-diketopyrrolopyrrole, and wherein the host chromophore is a 1,2,3,4-tetraphenyl benzo[4,5]imidazo[2,1]isoindol-11-one, and wherein the composition containing the host/guest combination exhibits a positive enhancement factor of at least 2.