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.

Abstract: Luminescent particles with a maximum diameter of less than 100 ?m are produced by stirring an emulsion material, including a host material, an organic luminescent material containing no heavy metal element, a surfactant and water, under conditions that melt the host material, thereby forming an emulsion, and then cooling the emulsion. This method can provide luminescent particles which are highly safe and which exhibit high luminous efficiency in water.

Abstract: The present disclosure relates to compounds of Formula (I) as useful materials for OLED's. At least two of Z1, Z2, Z3, Z4 and Z5 are CN, cyanoaryl, or heteroaryl having at least one nitrogen atom as a ring-constituting atom; and at least two of R1, R2, R3 and R4 are diarylamino, indolyl or carbazolyl.

Abstract: An organic-inorganic perovskite satisfying ET<ET1 and ES-ET?0.1 eV has a high emission efficiency. ES represents the excited singlet energy level in emission of an inorganic component, ET represents the excited triplet energy level in emission of an inorganic component, ET1 represents the excited triplet energy level in emission of an organic component.

Abstract: An organic electroluminescent device having an anode, a cathode, and a light emitting layer between the anode and the cathode, in which the light emitting layer contains a first organic compound, a second organic compound, and a third organic compound that satisfy the following expression (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, is capable of enhancing the light emission efficiency. ES1(A), ES1(B) and ES1(C) represent a lowest, singlet excitation energy level of the first, second and third organic compound, respectively.

Abstract: An organic light-emitting device containing both a compound represented by the following general formula (1) and a compound represented by the following general formula (2) has a high light emission efficiency. The rings a to c each are a benzene ring that can be optionally condensed, R1 and R2 each represent a substituted or unsubstituted aryl group, etc., four of R31 to R35 each are a substituted or unsubstituted carbazol-9-yl group, but all of these four are not the same, and the remaining one is a hydrogen atom, a cyano group, etc.

Abstract: An organic light-emitting device having a perovskite layer having a thickness of 50 nm or more has a low drive voltage and a high power efficiency, and can suppress interelectrode short-circuiting and current leakage.

Abstract: A nanoparticle conjugate includes a quantum dot (QD) and a thermally activated delayed fluorescence (TADF) molecule bound to the QD. In some instances, the TADF molecule can be directly bound to a surface of the QD. In other instances, the TADF molecule can be indirectly bound to the QD via an interaction with one or more capping ligands disposed on a surface of the QD. Nanoparticle conjugates described herein can be incorporated into emissive layers of electroluminescent light-emitting diode devices to yield electroluminescent quantum dot-containing light-emitting diode (QD-LED) devices.

Abstract: The present disclosure relates to compounds of Formula (I)-(V) as compounds capable of emitting delayed fluorescence and uses of these compounds in organic light-emitting diodes.

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 of Formula (I) and (II): as compounds capable of emitting delayed fluorescence, and uses of the compounds in organic light-emitting diodes.

Abstract: A compound represented by the following general formula is excellent in light emission properties. R1 and R2 each independently represent a fluorinated alkyl group, D represents a substituent in which Hammett's ?p value is negative, and A represents a substituent in which Hammett's ?p value is positive.

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

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

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

Abstract: The present disclosure relates to compounds of Formula (I) as useful materials for OLED's. X is O or S; Y1 to Y4 are N or R—C; at least one of R and R5 to R8 is CN or heteroaryl; and at least other one of R and R5 to R8 is diarylamino.