Abstract: A method of making an osmium(II) complex having Formula I, L1-Os-L2, wherein L1 and L2 are independently a biscarbene tridentate ligand, wherein L1 and L2 can be same or different is disclosed. The method includes (a) reacting a precursor of ligand L1 with an osmium precursor to form an intermediate product, wherein the osmium precursor having the formula OsHx(PR3)y, wherein x is an integer from 2 to 6 and y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; and (b) reacting a precursor of ligand L2 with said intermediate product.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: Imidazo[1,2-f]phenanthridine compounds are provided. The compounds have a twisted aryl moiety further substituted by alkyl having four or more atoms. The compounds may be used in organic light emitting devices, particularly as emissive dopants, providing devices with improved efficiency, stability, and manufacturing. In particular, the compounds provided herein may be used in blue devices having high efficiency.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: Imidazo[1,2-f]phenanthridine compounds are provided. The compounds have a twisted aryl moiety further substituted by alkyl having four or more atoms. The compounds may be used in organic light emitting devices, particularly as emissive dopants, providing devices with improved efficiency, stability, and manufacturing. In particular, the compounds provided herein may be used in blue devices having high efficiency.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: Novel heteroleptic iridium carbene complexes are provided, which contain at least two different carbene ligands. Selective substitution of the carbene ligands provides for phosphorescent compounds hat are suitable for use in a variety of OLED devices.

Abstract: Novel polydentate carbene complexes of ruthenium and formulations containing the same are provided. Organic light emitting device containing the novel polydentate carbene complexes of ruthenium in an emissive layer are also provided. The novel polydentate carbene complexes of ruthenium may be particularly useful in OLEDs to provide devices having improved performance.

Abstract: Novel molecules are provided that include a sensitizer group, an acceptor group, and an electron-transfer barrier that suppresses triplet-triplet energy transfer between the sensitizer group and the acceptor group. Organic light emitting devices (OLEDs) that include a layer including these novel molecules are also provided. These devices may be used to provide highly efficient OLEDs with longer operational lifetime.

Abstract: Neutral ruthenium(II) complexes having at least one bidentate carbene coordinated to the ruthenium through a ruthenium-carbene bond are provided. Also provided are organic light emitting devices comprising the ruthenium(II) carbene complexes.

Abstract: A novel compound having the formula Os(L)n is disclosed, wherein Os is osmium(IV) metal, L is a ligand coordinating to the Os atom, and n is an integer from 1 to 6, wherein each L can be same or different, wherein at least one L is a multidentate ligand, and wherein the compound is neutral.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: A region of a device is provided that includes a first material and a second material. The first and second materials may be co-dopants of an emissive material or region. The first material may have an energy gap of not more than about 100 meV between the first excited singlet state and the first excited triplet state. Excitons that transition to the T1 state can be activated to the S1 state due to the relatively small energy gap. This thermal activation process is fast enough that non-radiative decay from the T1 state to the S0 state is minimal or negligible, thus allowing for sensitization up to and including 100%. The second material may be a phosphorescent-capable material, and may act as a sensitizer to the first material.

Abstract: Iridium complexes with ligands containing twisted aryl groups having extended conjugation (i.e., the twisted aryl is substituted with an additional aryl group) and organic light emitting devices including the same are disclosed. The iridium complexes can be used in organic light emitting devices may provide improved stability color, lifetime and manufacturing.

Abstract: Novel organic compounds comprising a boron-nitrogen heterocycle are provided. In particular, the compound contains an azaborine. The compounds may be used in organic light emitting devices to provide devices having improved photophysical and electronic properties.

Abstract: Heteroleptic cyclometallated complexes having a 6-membered ring cyclometallated to the metal, as shown in Formula (I), are provided: wherein ring A and ring B are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; wherein L1 is BR, NR, PR, O, S, Se, C?O, S?O, SO2, CRR?, SiRR?, or GeRR?; wherein Z1 and Z2 are independently carbon or nitrogen; wherein at least one of Z1 and Z2 is carbon; wherein is a bidentate ligand selected from the group consisting of: wherein R1, R2, Ra, Rb, Rc, and Rd may represent mono, di, tri, or tetra substitution, or no substitution; wherein R1, R2, R, R?, Ra, Rb, Rc, and Rd are each independently selected from various substituents; and wherein n is 1 or 2. Devices, such as organic light emitting devices (OLEDs) that comprise phosphorescent light emitting materials are also provided.

Abstract: Novel polydentate carbene complexes of ruthenium and formulations containing the same are provided. Organic light emitting device containing the novel polydentate carbene complexes of ruthenium in an emissive layer are also provided. The novel polydentate carbene complexes of ruthenium may be particularly useful in OLEDs to provide devices having improved performance.

Abstract: Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1?,2?-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Abstract: Devices containing a particular combination of organic compounds are provided. In particular, the devices contain twisted aryl compounds having extended conjugation (i.e., the twisted aryl is substituted with an additional aryl group) in combination with dibenzothiophene or dibenzofuran containing host materials. The organic light emitting devices may provide improved stability color, lifetime and manufacturing. Compounds containing a twisted aryl having extended conjugation are also provided.