Patent ID: 8609258

Claim:
A light emitting composition comprising one or more compound of 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: and wherein m is an integer in the range of 1 to 9, p is an integer in the range or 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; wherein the one or more compound of formula (I) further comprises at least one host attached to the core, wherein the at least one host comprises a hole transport material, an electron transport material or a mixture thereof; and wherein the at least one host comprises wherein k is 0 or an integer selected from 1 to 20 and each R 5 is independently selected from the following: wherein R is independently selected from H or alkyl, and * indicates a point of attachment.