Abstract: A compound represented by the following general formula is an excellent light emitting material. R1 to R5 each represent a hydrogen atom, a deuterium atom, or a substituent other than a cyano group, but one or more of R1 to R5 is an aryl group or a pyridyl group, two or more of R1 to R5 are donor groups, and one or more of them are a substituted ring-fused indol-1-yl group (the number of rings constituting the fused ring is 4 or more).

Abstract: A compound represented by the following general formula has excellent light-emitting characteristics and emits light at a short wavelength. Y1 is N—RA; Y2 is O, S, C?O or N—RA; RA is an aryl group, etc.; R1 to R11 each are a hydrogen atom or a substituent; at least one of R1 to R3 is a carbazolyl group substituted with an aryl group, etc.

Abstract: The compound of the following general formula has excellent light emission characteristics. R1 to R5 are H, D, an alkyl group, an aryl group, a donor group, a triazinyl group substituted with Ar3 and Ar4, or the like, R2 or R3 is the triazinyl group or the like, two or more of R1 to R5 are donor groups, and Ar1 to Ar4 are an aryl group or a heteroaryl group.

Abstract: An organic light-emitting device using a compound of the following general formula has excellent light emission characteristics. R1 to R5 are H, D, an alkyl group, an aryl group, a donor group, a triazinyl group substituted with Ar3 and Ar4, or the like, R2 or R3 is the triazinyl group or the like, two or more of R1 to R5 are donor groups, and Ar1 to Ar4 are an aryl group or a heteroaryl group.

Abstract: An organic light-emitting device including a compound represented by each of the formulas has excellent luminescence characteristics. One of X1 and X2 is N, and the other is B; R1 to R26, A1, and A2 are H, D, or a substituent; X11 is O, S, etc.; A11 and A12 are benzene rings, furan rings, etc.; R111 to R115 are H, D, aryl, etc.; n is 3 or 4; and L is a single bond, an arylene group, etc.

Abstract: The compound represented by the following formula is useful as a light-emitting material. One of R1 to R5 is CN; another is Het-LA-*; other two or three are each a carbazolyl group, etc.; and the rest are others. Het is a heteroaryl group; and LA is a single bond or an arylene group.

Abstract: The compound of the following general formula has excellent light emission characteristics.

Abstract: The present disclosure relates to compounds of Formula (I) as useful materials for OLED's.

Abstract: The compound represented by the following formula is useful as a light-emitting material. R1 or R2 is Het-LA-* or CN-LA-*; one to three of R1 to R5 are diarylamino groups; the rest are a hydrogen atom or an aryl group; Het is a heteroaryl group; and LA is a single bond or an arylene group.

Abstract: The present disclosure relates to compounds of Formula I) as useful materials for OLED's. X1, X2 and X3 are N or C(R5); Ar1 and Ar2 are aryl, heteroaryl or cyano; L1 is single bond, arylene or heteroarylene; and R1, R2, R3 and R4 are diarylamino, carbazolyl, heteroaryl, H or alkyl.

Abstract: A compound of the following structure has excellent luminescence characteristics.

Abstract: A compound of the following structure has excellent luminescence characteristics. One of X1 and X2 is N and the other is B, and R1 to R26, A1, and A2 are H or substituents.

Abstract: A compound represented by the following general formula is an excellent light-emitting material. R1 to R5 each independently represent a hydrogen atom or a substituent, and one of R1 to R5 is a cyano group, one to three of R1 to R5 each are an aryl group Ar optionally substituted with an alkyl group or an aryl group, and one to three of R1 to R5 each are a donor group D (but excepting one that corresponds to Ar).

Abstract: The present disclosure relates to compounds capable of emitting delayed fluorescence, and uses of the compounds in organic light-emitting diodes.

Abstract: An organic light-emitting device having an organic mixed layer that contains a first organic compound and a second organic compound and a third organic compound satisfying ES1(A)>ES1(B)>ES1(C). ES1(A), ES1(B) and ES1(C) each represent a lowest excited singlet energy level of the first organic compound, the second organic compound and the third organic compound, respectively. The second organic compound and the third organic compound are delayed fluorescent materials. The invention provides an organic light-emitting device having a long lifetime and a high light emission efficiency.

Abstract: An organic light emitting element produced by using a light emitting composition that contains both a first compound having a PBHT value more than 0.730 and a second compound having ES1 lower than that of the first compound and ?EST less than 0.20 eV is excellent in durability. ES1 is the lowest excited singlet energy level, ?EST is the difference between the lowest excited singlet energy level and the lowest excited triplet energy level.

Abstract: To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R1 to R5 each are a substituent not containing a cyano group, n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.

Abstract: Using a compound represented by a general formula (A)m-L-(D)n, a light-emitting device having a high emission efficiency can be provided. L is an (m+n)-valent aromatic linking group; A is a group having a positive Hammett's ?p value; D is a group having a negative Hammett's ?p value; m is an integer of 1 or more; n is an integer of 2 or more. Two of plural D's differ in point of the substituent condition at specific aromatic rings.

Abstract: An organic electroluminescent device having an anode, a cathode, and a light-emitting layer between the anode and the cathode, wherein the light-emitting layer contains at least a first organic compound, a second organic compound and a third organic compound satisfying the following formula (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light-emitting material, has a high light emission efficiency. Formula (A): ES1(A)>ES1(B)>ES1(C) wherein ES1(A), ES1(B) and ES1(C) each represent a lowest excited singlet energy level of the first organic compound, the second organic compound and the third organic compound, respectively.

Abstract: An emissive layer of a top-emitting (TE) printed display comprises a combination of solution-processable nanocrystal quantum dots, thermally activated delayed fluorescent molecules, and a suitable host material along with both electron and hole charge transport materials sandwiched into a microcavity between a reflective bottom electrode and a transparent or semi-transparent top electrode. The electrodes may be reflective metals and the thickness of the emissive layers and charge transport layers may be tuned according to the required resonant wavelength along with the thickness of the top semi-transparent electrode to optimize the resonant condition and maximize the light output.