Abstract: The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

Abstract: The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

Abstract: The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

Abstract: A light emitting device contains an anode, cathode, and two organic layers provided therebetween. One organic layer contains a phosphorescent compound, the second organic layer contains a block copolymer containing an end group, a block that binds to the end group and/or a block that does not bind to the end group, and a crosslinked product of the block copolymer. The non-terminal block contains a non-crosslinkable unit represented by the formula (X) and/or a non-crosslinkable unit represented by the formula (Z). At least one of XI>XII; ZI>ZII; XI+ZI>XII+ZII is satisfied when the total number of units having formula (X) and the total number of units having formula (Z) in the non-terminal block are XI and ZI, respectively, and the total number of units having formula (X) and the total number of units having formula (Z) in the terminal block are XII and ZII, respectively.

Abstract: The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

Abstract: The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

Abstract: A method of producing a film having excellent external quantum efficiency when used in a light emitting layer of a light emitting device is provided. A method of film production includes preparing an ink containing a specific metal complex, storing the ink for 3 days or more under light shielding, and forming a film by using the stored ink. The total content of metal complexes having a molecular weight larger by 16, 32 or 48 than that of the specific metal complex according to an area percentage value determined by liquid chromatography is 0.6 or less when the content of the specific metal complex is taken as 100.

Abstract: A light emitting device having excellent luminance life contains an anode, a cathode, a first organic layer disposed between the anode and the cathode and a second organic layer disposed between the anode and the cathode. The first organic layer contains a compound represented by the formula (C-1), and the second organic layer contains a compound represented by the formula (C-1) and a cross-linked body of a crosslinkable material. Ring R1C and Ring R2C represent an aromatic hydrocarbon ring or an aromatic hetero ring and RC represents an oxygen atom, a sulfur atom or a group represented by the formula (C?-1). Ring R3C and Ring R4C represent an aromatic hydrocarbon ring or an aromatic hetero ring and RC? represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.

Abstract: A composition which is useful for producing a light emitting device having excellent external quantum efficiency contains two or more compounds represented by the formula (C-1) and a phosphorescent compound, in which at least one of the compounds represented by the formula (C-1) is a compound in which RC is a group represented by the formula (C?-1). Ring R1C and Ring R2C represent an aromatic hydrocarbon ring or an aromatic hetero ring. RC represents an oxygen atom, a sulfur atom or a group represented by the formula (C?-1). Ring R3C and Ring R4C represent an aromatic hydrocarbon ring or an aromatic hetero ring. RC? represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.

Abstract: A light emitting device having excellent external quantum efficiency contains an anode, a cathode, and two organic layers disposed therebetween. One layer contains a phosphorescent transition metal complex and a low molecular weight compound containing no transition metal, and the second layer contains a crosslinked body of a polymer compound (having an energy level of the lowest triplet excited state of 2.30 eV or more) containing a constitutional unit having a crosslinking group. The low molecular weight compound has formula (T-1) and the absolute value of the difference between the energy levels of the lowest triplet excited state and the lowest singlet excited state is less than 0.25 eV. nT1 represents an integer of 0 to 5, nT2 represents an integer of 1 to 10, ArT1 represents a substituted amino group or a monovalent hetero ring group, LT1 represents an alkylene group, and ArT2 represents a hetero ring group.

Abstract: A light emitting device having an anode, a cathode, a first organic layer and a second organic layer disposed between the anode and the cathode is provided.

Abstract: A composition useful for the production of a light emitting device showing suppressed initial degradation, and a light emitting device formed by using the composition are provided. The composition contains a blended host material and a guest material, in which the host material contains an aromatic compound having a condensed ring skeleton in which only three or more benzene rings are condensed, the guest material contains an aromatic amine compound, and the total amount of a silicon atom contained in the host material and a silicon atom contained in the guest material is 20 ppm by mass or less with respect to the total amount of the host material and the guest material.

Abstract: A light emitting device having an anode, a cathode, and an organic layer disposed between the anode and the cathode and containing a composition is described. The composition contains a compound (A) represented by the formula (FH) and a compound (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring, and the molecular weight (MA) of the compound (A) and the molecular weight (MB) of the compound (B) satisfy the formula (M1-1) and the formula (M2-1).

Abstract: A light emitting device is provided which includes an anode, a cathode, and an organic layer disposed between the anode and the cathode and including a composition containing a thermally activated delayed fluorescent compound (A), a boron atom, and a compound (B) having a condensed hetero ring skeleton. The absolute value (|EB?AA|) of a difference between the energy value of the maximum peak of the emission spectrum at 25° C. of compound (B) and the energy value of a peak at the lowest energy side of the absorption spectrum at 25° C. of compound (A) is 0.60 eV or less. The absolute value of a difference between the energy levels of the lowest triplet and singlet excited states of compound (A) is 0.50 eV or less. The absolute value of a difference between the energy levels of the lowest triplet and singlet excited states of compound (B) is 0.50 eV or less.

Abstract: A light emitting device including an anode, a cathode, and an organic layer disposed between the anode and the cathode and containing a composition is provided. The composition contains two or more compounds (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring. Compound (B) contains a compound (B1) and a compound (B2) which satisfy at least one of the following formulas: EB1<EB2 and AB1<AB2. EB1 represents the maximum peak wavelength of the emission spectrum at 25° C. of compound (B1), EB2 represents the maximum peak wavelength of the emission spectrum at 25° C. of compound (B2), AB1 represents the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. of compound (B1), and AB2 represents the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. of compound (B2).

Abstract: A composition which is useful for producing a light emitting device having excellent external quantum efficiency and a light emitting device containing the composition are described. The light emitting device contains an anode, a cathode, and an organic layer disposed between the anode and the cathode and contains a composition containing at least two compounds (A) selected from the group consisting of a compound represented by the formula (FH) and a polymer compound containing a constitutional unit having a group obtained by removing from a compound represented by the formula (FH) one or more hydrogen atoms, and a compound (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring.

Abstract: A composition which is useful for producing a light emitting device having excellent light emission efficiency and a light emitting device containing the composition are described. The light emitting device contains an anode, a cathode, and an organic layer disposed between the anode and the cathode and contains a composition containing a metal complex represented by the formula (2), and a compound (B) having a condensed hetero ring skeleton (b) containing a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an sp3 carbon atom and a nitrogen atom in the ring.

Abstract: A composition which is useful for production of a light emitting device excellent in light emission efficiency is provided. In particular, provided is a composition containing a compound represented by formula (1) and a phosphorescent compound, wherein R1 and R2 each independently represent a substituent, n1 represents an integer of 1 to 14, and Ar1 represents an arylene group or a divalent heterocyclic group, and at least one of one or more groups Ar1 is a group represented by the formula (1-A), wherein the variable groups R1A to R8A, R91A, and R92A are as defined in the specification.

Abstract: A composition which is useful for producing a light emitting device of which initial deterioration is suppressed and a light emitting device formed using the composition are described. The composition contains a host material and a guest material blended therein; the host material contains an aromatic compound having a condensed ring skeleton in which only three or more benzene rings are condensed, the guest material contains a compound having a heterocyclic group containing a carbon atom and at least one selected from a boron atom, a nitrogen atom, a phosphorus atom, an oxygen atom, a sulfur atom and a selenium atom in the ring, and the total amount of silicon atoms contained in the host material and in the guest material is over 0 ppm by mass and 28 ppm by mass or less with respect to the total amount of the host material and the guest material.

Abstract: A composition which is useful for production of a light emitting device of which initial deterioration is suppressed, and a light emitting device formed using the composition, are provided. The composition contains a host material and a guest material blended therein. The host material contains an aromatic compound having a condensed ring skeleton in which only three or more benzene rings are condensed. The guest material contains an aromatic amine compound. The total amount of sodium atoms contained in the host material and sodium atoms contained in the guest material is 400 ppb by mass or less with respect to the total amount of the host material and the guest material.