Binuclear compounds

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising a organometallic emissive material, wherein the organometallic emissive material is a binuclear material that comprises:
• a first metal center selected from the group consisting of d7, d8 and d9 metals;
• a second metal center selected from the group consisting of d7, d8 and d9 metals;
• two bridging ligands, wherein each bridging ligand is coordinated to the first metal center and to the second metal center;
• a first bidentate photoactive ligand bound to the first metal center, and
• a second bidentate photoactive ligand bound to the second metal center.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising an organometallic emissive material comprising:
• a first metal center selected from the group consisting of d7, d8 and d9 metals;
• a second metal center selected from the group consisting of d7, d8 and d9 metals;
• and
• a bridging ligand coordinated to the first metal center and to the second metal center,
• wherein substantially all of the light emitted from the device results from emission from an excimer-like excited state in which an excited state wave function extends over the first and second metal centers;
• and wherein the organometallic emissive material meets (a) or (b) or (c):
• (a) the metal centers are held in a co-facial configuration by the bridging ligand;
• or
• (b) the organometallic emissive material further comprises a second bridging ligand;
• or
• (c) the organometallic emissive material further comprises a second bridging ligand, and the metal centers are held in a co-facial configuration by at least one of the bridging ligands.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising an organometallic emissive material, wherein the emissive material has the structure:

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising an organometallic emissive material comprising:
• a first metal center selected from the group consisting of d7, d8 and d9 metals;
• a second metal center selected from the group consisting of d7, d8 and d9 metals;
• and
• a bridging ligand coordinated to the first metal center and to the second metal center;
• wherein the distance between the first metal center and the second metal center is less than about 4 Angstroms;
• and wherein the organometallic emissive material meets (a) or (b) or (c):
• (a) the metal centers are held in a co-facial configuration by the bridging ligand;
• or
• (b) the organometallic emissive material further comprises a second bridging ligand;
• or
• (c) the organometallic emissive material further comprises a second bridging ligand, and the metal centers are held in a co-facial configuration by at least one of the bridging ligands.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising a binuclear organometallic emissive material comprising:
• a first metal center that has a coordination number of 4;
• a second metal center that has a coordination number of 4;
• and
• a bridging ligand coordinated to the first metal center and to the second metal center;
• wherein the organometallic emissive material meets (a) or (b) or (c):
• (a) the metal centers are held in a co-facial configuration by the bridging ligand;
• or
• (b) the organometallic emissive material further comprises a second bridging ligand;
• or
• (c) the organometallic emissive material further comprises a second bridging ligand, and the metal centers are held in a co-facial configuration by at least one of the bridging ligands.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising a binuclear organometallic emissive material comprising:
• a first metal center;
• a second metal center;
• a bridging ligand coordinated to the first metal center and to the second metal center;
• a first photoactive ligand coordinated to the first metal center;
• a second photoactive ligand coordinated to the second metal center;
• wherein the first and second photoactive ligands have the following partial structure:
• wherein M is a d7, d8 or d9 metal, and wherein the organometallic emissive material meets (a) or (b) or (c):
• (a) the metal centers are held in a co-facial configuration by the bridging ligand;
• or
• (b) the organometallic emissive material further comprises a second bridging ligand;
• or
• (c) the organometallic emissive material further comprises a second bridging ligand, and the metal centers are held in a co-facial configuration by at least one of the bridging ligands.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising a binuclear organometallic emissive material comprising:
• a first metal center;
• a second metal center;
• a bridging ligand coordinated to the first metal center and to the second metal center;
• a first photoactive ligand coordinated to the first metal center;
• a second photoactive ligand coordinated to the second metal center;
• wherein each bridging ligand is selected from the group consisting of carboxylates (RCCO−), thiocarboxyloic acids (RCSS−), pyrophosphate (−O3P—O—PO-3−) or a compound of the formula
• and derivatives thereof, and wherein the organometallic emissive material meets (a) or (b) or (C):
• (a) the metal centers are held in a co-facial configuration by the bridging ligand;
• or
• (b) the organometallic emissive material further comprises a second bridging ligand;
• or
• (c) the organometallic emissive material further comprises a second bridging ligand, and the metal centers are held in a co-facial configuration by at least one of the bridging ligands.

An organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an emissive layer disposed between and electrically connected to the anode and the cathode, the emissive layer comprising a binuclear organometallic emissive material comprising:
• a first metal center;
• a second metal center;
• and
• a bridging ligand coordinated to the first metal center and to the second metal center;
• wherein the metal centers are held in a co-facial configuration by the bridging ligand.