Patent ID: 7625596

Claim:
A method for making a first layer in an electroactive device comprising the steps of (i) preparing a first layer composition by mixing at least one adhesion promoter material and at least one organic electroactive material; wherein the adhesion promoter material comprises 9,9-disubstituted fluorenyl compound of formula (l): wherein each R is independently alkyl, aryl, halogen, cyano, alkoxide, carboxylate, or hydroxy; each “x” independently has a value of from 0 to the number of positions which can be substituted on the aromatic ring; each R 1 is independently a C 1 -C 16 alkyl group or an aryl group; each R 2 is independently a C 1 -C 16 alkyl group; and the geometry about each double bond is independently either cis or trans, and combination thereof; and (ii) depositing said composition on a second electroactive layer of said electroactive device to form said first layer; and (iii) optionally further depositing a third layer of electroactive material onto the surface of said first layer opposite the second layer, wherein said first layer composition enables adhesion between said first layer and said second layer or between said first layer and said third layer, or between said first layer and both said second layer and said third layer.