Phosphorescence compound and electro field light emitting device having the same

A light-emitting device comprising:

• a first electrode formed over a substrate;
• an electroluminescent layer formed over the first electrode;
• and
• a second electrode over the electroluminescent layer;
• wherein the electroluminescent layer comprises a hole injecting layer, a hole transporting layer over the hole injecting layer, a light-emitting layer over the hole transporting layer, a hole blocking layer over the light-emitting layer, and an electron transporting layer over the hole blocking layer,
• wherein the light-emitting layer comprises a host material and a phosphorescent compound as a guest material,
• wherein the phosphorescent compound is represented by general formula
• wherein R1 is an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R2 is hydrogen, an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R3 and R4, each of which may be the same or different, are individually hydrogen, a halogen element, an alkyl group, an alkoxy group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein M is one element of group 9 in the periodic table or one element of group 10 in the periodic table,
• wherein n=2 when the M is one element of group 9 in the periodic table, and n=1 when the M is one element of group 10 in the periodic table, and
• wherein L is a monoanionic ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.

A light-emitting device comprising:

• a first electrode formed over a substrate;
• an electroluminescent layer formed over the first electrode;
• and
• a second electrode over the electroluminescent layer;
• wherein the electroluminescent layer comprises a hole injecting layer, a hole transporting layer over the hole injecting layer, a light-emitting layer over the hole transporting layer, a hole blocking layer over the light-emitting layer, and an electron transporting layer over the hole blocking layer,
• wherein the light-emitting layer comprises a host material, a phosphorescent compound as a first guest material, and a second guest material,
• wherein the phosphorescent compound is represented by general formula
• wherein R1 is an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R2 is hydrogen, an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R3 and R4, each of which may be the same or different, are individually hydrogen, a halogen element, an alkyl group, an alkoxy group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein M is one element of group 9 in the periodic table or one element of group 10 in the periodic table,
• wherein n=2 when the M is one element of group 9 in the periodic table, and n=1 when the M is one element of group 10 in the periodic table, and
• wherein L is a monoanionic ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.

A light-emitting device comprising:

• a first electrode formed over a substrate;
• an electroluminescent layer formed over the first electrode;
• and
• a second electrode formed over the electroluminescent layer;
• wherein the electroluminescent layer comprises a phosphorescent compound represented by general formula
• wherein R1 is an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R2 is hydrogen, an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R3 and R4, each of which may be the same or different, are individually hydrogen, a halogen element, an alkyl group, an alkoxy group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein M is selected from Co, Rh, Ir, Ni, Pd, and Pt,
• wherein n=2 when the M is selected from Co, Rh, and Ir, and n=1 when the M is selected from Ni, Pd, and Pt, and,
• wherein L is a monoanionic ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.

A light-emitting device comprising:

• a first electrode formed over a substrate;
• an electroluminescent layer formed over the first electrode;
• and
• a second electrode over the electroluminescent layer;
• wherein the electroluminescent layer comprises a hole injecting layer, a hole transporting layer over the hole injecting layer, a light-emitting layer over the hole transporting layer, a hole blocking layer over the light-emitting layer, and an electron transporting layer over the hole blocking layer,
• wherein the light-emitting layer comprises a host material and a phosphorescent compound as a guest material,
• wherein the phosphorescent compound is represented by general formula
• wherein R1 is an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R2 is hydrogen, an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R3 and R4, each of which may be the same or different, are individually hydrogen, a halogen element, an alkyl group, an alkoxy group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein M is selected from Co, Rh, Ir, Ni, Pd, and Pt,
• wherein n=2 when the M is selected from Co, Rh, and Ir, and n=1 when the M is selected from Ni, Pd, and Pt, and,
• wherein L is a monoanionic ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.

A light-emitting device comprising:

• a first electrode formed over a substrate;
• an electroluminescent layer formed over the first electrode;
• and
• a second electrode over the electroluminescent layer;
• wherein the electroluminescent layer comprises a hole injecting layer, a hole transporting layer over the hole injecting layer, a light-emitting layer over the hole transporting layer, a hole blocking layer over the light-emitting layer, and an electron transporting layer over the hole blocking layer,
• wherein the light-emitting layer comprises a host material, a phosphorescent compound as a first guest material, and a second guest material,
• wherein the phosphorescent compound is represented by general formula
• wherein R1 is an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R2 is hydrogen, an alkyl group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein R3 and R4, each of which may be the same or different, are individually hydrogen, a halogen element, an alkyl group, an alkoxy group, an aryl group, a substituted aryl group, a heterocyclic group, or a substituted heterocyclic group,
• wherein M is selected from Co. Rh. Ir. Ni. Pd. and Pt.
• wherein n=2 when the M is selected from Co, Rh, and Ir, and n=1 when the M is selected from Ni, Pd, and Pt, and,
• wherein L is a monoanionic ligand having a β-diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.