Abstract:
A novel phosphorescent organometallic iridium complex is provided in which a coordination position of a ligand with respect to a metal can be controlled in synthesis. A novel phosphorescent organometallic iridium complex is provided which can keep high quantum efficiency and can emit phosphorescence in the blue to green wavelength region. A phosphorescent organometallic iridium complex which includes a structure represented by General Formula (G1) and whose ligand is a 4H-1,2,4-triazole compound which has an unsubstituted phenyl group at the 3-position, a substituted or unsubstituted phenyl group at the 4-position, and a phenyl group at the 5-position. In the phenyl group at the 5-position, an alkyl group is bonded to at least one of the ortho-positions, and the other of the ortho-positions, the meta-positions, and the para-position are substituted or unsubstituted.
Abstract:
The organic compound represented by Formula G1 below has a structure in which the 2-position of a dibenzoquinazoline ring is directly, or via one or more arylene groups, bonded to a skeleton with a hole-transport property. In the formula, n represents any of 0 to 3, m represents 1 or 2, A represents a single bond, or a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, B represents a ring having a substituted or unsubstituted dibenzofuran skeleton, a substituted or unsubstituted dibenzothiophene skeleton, or a substituted or unsubstituted carbazole skeleton, and each of R1 to R14 independently represents any of hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 5 to 7 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.
Abstract:
An object is to provide an organic compound having high heat resistance and a light-emitting element, a light-emitting device, an electronic device, and a display device each having high reliability. Provided are an organic compound having a 2,2′-(pyridine-2,6-diyl)bipyrimidine skeleton in which the 2-positions of pyrimidine skeletons are bonded to the 2- and 6-positions of a pyridine skeleton, and having a structure in which at least one aryl group having a fused structure with 10 to 16 carbon atoms is bonded to the 2,2′-(pyridine-2,6-diyl)bipyrimidine skeleton, and a light-emitting element, a light-emitting device, an electronic device, and a display device each containing the organic compound.
Abstract:
A high-purity organometallic iridium complex is provided. The organometallic iridium complex includes iridium and a plurality of ligands cyclometallated to the iridium. Each of the plurality of ligands includes a heteroaromatic ring having a coordinatable nitrogen atom. In LC analysis of the organometallic iridium complex, an impurity which has a monochlorinated ligand among the plurality of ligands is 0.1% or less by quantitating using peak area count with a PDA detector.
Abstract:
An organometallic complex emitting light with high color purity. The organometallic complex is represented by General Formula (G1). In General Formula (G1), L represents a monoanionic ligand; R1 represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms; each of R2 to R5 independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted phenyl group; the organometallic complex is monosubstituted, disubstituted, trisubstituted, tetrasubstituted, or unsubstituted by the R5; X represents O, S, or Se; and M represents a metal belonging to Group 9 or 10. When M represents a metal belonging to Group 9, in is 3 and n is 1, 2, or 3. When M represents a metal belonging to Group 10, m is 2 and n is 1 or 2.
Abstract:
As a novel substance having a novel skeleton, an organometallic complex with high emission efficiency which achieves improved color purity by a reduction of half width of an emission spectrum is provided. One embodiment of the present invention is an organometallic complex in which a β-diketone and a six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom are ligands. In General Formula (G1), X represents a substituted or unsubstituted six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom. Further, R1 to R4 each represent a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.
Abstract:
As a novel substance having a novel skeleton, provided is a novel phosphorescent organometallic iridium complex that can emit phosphorescence in a blue green to red wavelength region and has high emission efficiency. The phosphorescent organometallic iridium complex has a ligand having a pyridyl pyrimidine skeleton, i.e., the phosphorescent organometallic iridium complex has a ligand having a structure represented by the following general formula (G0). Note that in the formula, R1 and R4 to R6 separately represent hydrogen or an alkyl group having 1 to 6 carbon atoms; and R2 and R3 separately represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a phenyl group that may have a substituent, and a pyridyl group that may have a substituent.
Abstract:
A light-emitting element having extremely high efficiency of approximately 25% is provided. The light-emitting element includes a light-emitting layer which contains a phosphorescent guest, an n-type host, and a p-type host, where the light-emitting layer is interposed between an n-type layer including the n-type host and a p-type layer including the p-type host, and where the n-type host and the p-type host are able to form an exciplex in the light-emitting layer. The light-emitting element exhibits an extremely high emission efficiency (power efficiency of 74.3 lm/W, external quantum efficiency of 24.5%, energy efficiency of 19.3%) at a low driving voltage (2.6 V) at which luminance of 1200 cd/m2 is attainable.
Abstract:
A light-emitting element including a phosphorescent organometallic complex is provided. The organometallic complex emits phosphorescence in the yellow green to orange wavelength range and has high emission efficiency and high reliability. Thus, the organometallic complex that exhibits phosphorescence is provided. The organometallic complex, in which nitrogen at the 3-position of a pyrimidine ring is coordinated to a metal, a carbazole skeleton is bonded to the 4-position of the pyrimidine ring, and the carbazole skeleton is bonded to the metal, is used as an emission center. The metal is preferably a Group 9 element or a Group 10 element, more preferably iridium.
Abstract:
Provided is a novel organometallic complex which can be synthesized easily and emits phosphorescence, or a compound which emits red phosphorescence. The inventors focused on easy synthesis of an m-aminophenyl pyrazine derivative represented by the following general formula (G0), synthesized an organometallic complex having a structure in which the derivative is coordinated to a Group 9 or Group 10 metal ion, and further synthesized a useful substance which emits red phosphorescence.