Patent ID: 8721922

Claim:
A composition comprising: an electron transport compound; an emissive compound; and an organic solvent; wherein the emissive compound is represented by formula (I): wherein: core is a nanoparticle core; n is 2; X is a single bond or wherein * indicates a point of attachment to the core; each is independently a first optionally substituted bidentate ligand; is a second optionally substituted bidentate ligand selected from: wherein k is 0 or an integer selected from 1 to 20; m is an integer in the range of 1 to 9; p is an integer in the range of 1 to 20, z is 0, 1 or 2; R 1 is selected from alkyl, substituted alkyl, aryl and substituted aryl; R 2 is selected from: alkyl, substituted alkyl, aryl and substituted aryl; each R 5 is independently selected from the following: wherein R is independently selected from H or alkyl; and * indicates a point of attachment.