Benzothiazole-containing two-photon chromophores exhibiting strong frequency upconversion

Abstract

There are provided asymmetrical two-photon chromophores of the formula: D--Ar--A wherein Ar is selected from the group consisting of ##STR1## wherein Fl is a fluorene group of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are alkyl groups having 2 to 20 carbon atoms, and wherein R.sub.1 and R.sub.2 are the same or different; wherein D is ##STR3## wherein Q is selected from the group consisting of --H, --OH and --O--C.sub.x H.sub.2x+1, wherein x has a value of 1 to 10; and wherein A is selected from the group consisting of ##STR4## wherein Z is selected from the group consisting of --O-- and --S--.

Dependencies are inferred from the claim text.