Abstract: A light emitting composition comprising a central platinum group transition metal coordinated to a bridged tetradentate ligand comprised of chelating bis(azinyl)amine groups. A six-membered heteroatom ring is formed through coordination of the chelating ligand with the transition metal. An electron donating moiety serves as a bridge between the bis(azinyl)amine groups. The electron donating moiety can include amine or aryl groups. The platinum group transition metal may be selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, and osmium. Additionally, OLED devices are provided, each of the OLED devices comprising a light emitting layer that includes one of the light emitting compositions.

Abstract: A light emitting composition comprising a central platinum group transition metal and a bidentate ligand comprised of at least one pyridyl group with an electron donating substituent in the 4 position forming a six membered ring complex. The electron donating substituent is represented by an alkyl, aryl or amine group. The platinum group transition metal may be selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, and osmium. Additionally, OLED devices are provided, each of the OLED devices comprising a light emitting layer that includes one of the light emitting compositions.

Abstract: A light emitting composition comprising a central platinum group transition metal and a bidentate ligand of novel structure for transition metal complexes forming a six membered ring. The platinum group transition metal may be selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, and osmium. Additionally, OLED devices are disclosed, each of the OLED devices comprising a light emitting layer that includes one of the light emitting compositions.