Opto-electroactive device comprising a metallocene and method

An opto-electroactive device comprising:

• (a) an anode;
• (b) a cathode;
• and (c) a layer comprising a zirconocene of the formula
• wherein X is halogen and R1–R5 are each independently hydrogen, aryl, alkyl, halogen or —Si(R6)3;
• or wherein at least two adjacent R substituents on at least one ring are joined to form a fused ring, which may be unsubstituted or substituted with aryl, alkyl, halogen or —Si(R6)3 wherein R6 is an alkyl group, a substituted alkyl group, an aryl group or a substituted aryl group;
• or wherein the R1 substituents on each ring are joined to link the rings via a bridging ansa group;
• and
• wherein the layer (c) is a light-emitting layer and the device emits light in the wavelength range of about 300 nm to about 1200 nm;
• or wherein the layer (c) is a light-absorbing layer and the device absorbs light in the wavelength range of about 300 nm to about 1200 nm;
• or wherein the layer (c) is a hole-blocking layer.