Abstract: The invention provides an OLED device comprising a cathode, an anode, and having therebetween a layer containing an acridone compound including a diarylamine or carbazole substituent where the nitrogen of the acridone and the nitrogen of the diarylamine or carbazole are connected by an aromatic hydrocarbon linking group. OLED devices of the invention exhibit improved efficiency and drive voltage.

Abstract: An organic light emitting device contains a cathode, an anode, and has located there-between a light emitting layer, comprising co-hosts including a hole transporting compound and a particular aluminum chelate, together with at least one light emitting Iridium compound, wherein the Iridium compound is a tris C^N-cyclometallated complex with a triplet energy less than or equal to the triplet energy of each of the co-hosts.

Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).

Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).

Abstract: An electroluminescent device comprises a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising at least one hole transporting co-host and at least one electron transporting co-host, together with at least one phosphorescent emitter, and wherein the triplet energy of each of the co-host materials is greater than the triplet energy of the phosphorescent emitter, and further containing an exciton blocking layer comprising a hole transporting material with triplet energy greater or equal to 2.5 eV adjacent the emitting layer on the anode side. The invention provides devices that emit light with high luminous efficiency at low voltage.

Abstract: An OLED device contains a layer comprising a hole transporting compound, a certain type of oxinoid compound, and a light emitting phosphorescent compound.

Abstract: An electroluminescent device comprises a light-emitting layer containing a light emitting material that contains an organometallic complex having a partial structure represented by the following formula (I): wherein, M represents a metal selected from group 8, 9, or 10 metals; and one X is a carbon that forms a covalent bond with M and the other two X is are heteroatoms, one of which forms a coordinative bond with M and the other of which forms a covalent bond with M; wherein all of the Xs are linked together to form a dianionic tridentate cyclometallating ligand to form a five or six-membered metallocycle with M where each X can be a part of a separate cyclic or acyclic structure.

Abstract: The invention provides an OLED device comprising a cathode, an anode, and having therebetween a layer containing an acridone compound including a diarylamine or carbazole substituent where the nitrogen of the acridone and the nitrogen of the diarylamine or carbazole are connected by an aromatic hydrocarbon linking group. OLED devices of the invention exhibit improved efficiency and drive voltage.

Abstract: A process for forming a facial tris-cyclometallated iridium or rhodium complex isomer comprises heating an original composition containing (a) a meridional isomer of a tris-cyclometallated iridium or rhodium complex in (b) an organic hydrocarbon solvent, a halogenated hydrocarbon solvent, or a combination thereof, to a reaction temperature of least 150° C. for a time sufficient to form a product containing the facial isomer in an increased ratio to meridional isomer compared to the original composition. The process is simple and efficient and provides improved purity.

Abstract: A process for forming a facial tris-cyclometallated iridium or rhodium complex isomer comprises heating an original solid composition containing meridional isomer of the metal complex at a temperature and for a time sufficient to form a product containing the facial isomer in an increased ratio to meridional isomer compared to the original composition.

Abstract: A process for forming a facial tris-cyclometallated rhodium or iridium complex isomer from a meridional isomer comprises subjecting the meridional isomer to an isomerization reaction in the presence of an acid, an organic solvent, and silica particles.

Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM ??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).

Abstract: An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): LnM ??(I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).

Abstract: A process for forming a facial tris-cyclometallated iridium or rhodium complex isomer comprises heating an original composition containing (a) a meridional isomer of a tris-cyclometallated iridium or rhodium complex in (b) an organic hydrocarbon solvent, a halogenated hydrocarbon solvent, or a combination thereof, to a reaction temperature of least 150° C. for a time sufficient to form a product containing the facial isomer in an increased ratio to meridional isomer compared to the original composition. The process is simple and efficient and provides improved purity.

Abstract: A process for forming a facial tris-cyclometallated iridium or rhodium complex isomer comprises heating an original solid composition containing meridional isomer of the metal complex at a temperature and for a time sufficient to form a product containing the facial isomer in an increased ratio to meridional isomer compared to the original composition.

Abstract: An electroluminescent device comprises a light-emitting layer containing a light emitting material that contains an organometallic complex having a partial structure represented by the following formula (I): wherein, M represents a metal selected from group 8, 9, or 10 metals; and one X is a carbon that forms a covalent bond with M and the other two Xs are heteroatoms, one of which forms a coordinative bond with M and the other of which forms a covalent bond with M; wherein all of the Xs are linked together to form a dianionic tridentate cyclometallating ligand to form a five or six-membered metallocycle with M where each X can be a part of a separate cyclic or acyclic structure.

Abstract: A process for forming a facial tris-cyclometallated rhodium or iridium complex isomer from a meridional isomer comprises subjecting the meridional isomer to an isomerization reaction in the presence of an acid, an organic solvent, and silica particles.

Abstract: An OLED device comprising a cathode, an anode, and having located therebetween a light emitting layer containing an emitting compound having formula (I): (piq)b M ppy ??(I) wherein piq is a phenylisoquinoline group and ppy is a phenylpyridine group bearing at least one further substituent on the pyridine ring, wherein M is Ir, Rh, Pt, or Pd and b is 2 in the case of Ir and Rh and 1 in the case of Pt and Pd.

Abstract: An electroluminescent device comprises a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising at least one hole transporting co-host and at least one electron transporting co-host, together with at least one phosphorescent emitter, and wherein the triplet energy of each of the co-host materials is greater than the triplet energy of the phosphorescent emitter, and further containing an exciton blocking layer comprising a hole transporting material with triplet energy greater or equal to 2.5 eV adjacent the emitting layer on the anode side. The invention provides devices that emit light with high luminous efficiency at low voltage.

Abstract: An electroluminescent device comprises a light-emitting layer containing an organometallic compound comprising a metal and a ligand that coordinates to the metal through at least four bonds as represented by Formula (1) wherein at least one is a carbon-metal bond: MX)n??(1) wherein M represents a metal, X represents an independently selected atom, n?4, at least one X is carbon, and all X are linked to form a multidentate ligand.