Abstract: An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, wherein the organic layer includes an emission layer and a buffer layer between the emission layer and the second electrode, the buffer layer directly contacts the emission layer and includes a first compound and a quinolinolato-based metal complex, and the first compound is a compound including at least one electron transporting moiety.

Abstract: An organic electroluminescence device according to an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an exciton diffusion layer disposed on the hole transport region and including a first host represented by Formula 1, an emission layer disposed on the exciton diffusion layer and including a second host, a third host, and a phosphorescent dopant, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The organic electroluminescence device exhibits high efficiency and a long service life.

Abstract: Light emitting element includes a first electrode, a hole transport region, a light emitting layer, an electron transport region, and a second electrode that are sequentially stacked. The light emitting layer includes a first sub light emitting layer adjacent the first electrode, a second sub light emitting layer on the first sub light emitting layer, and a light emitting auxiliary layer between the first sub light emitting layer and the second sub light emitting layer and including a plurality of auxiliary compounds. The light emitting auxiliary layer includes a first state in which an average separation distance between the auxiliary compounds is a first distance, and a second state in which an average separation distance between the auxiliary compounds is a second distance smaller than the first distance. An external quantum efficiency is larger when the light emitting auxiliary layer is in the second state than in the first state.

Abstract: A light emitting element includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region. The electron transport region includes an electron transport layer on the emission layer, a first electron injection layer on the electron transport layer, and a second electron injection layer on the first electron injection layer, the thicknesses of the first and second electron injection layers are each about 1 nm to about 5 nm, the first electron injection layer includes a phenanthroline derivative and/or a phosphine oxide derivative, and the second electron injection layer includes a metal material.

Abstract: Embodiments provide a light emitting element and a display device including the same. The light emitting element includes a first electrode, a second electrode, and a plurality of emission layers disposed between the first electrode and the second electrode, wherein at least one of the plurality of emission layers include a hole transporting host, an electron transporting host, a phosphorescent sensitizer, and a first fluorescent dopant. The first fluorescent dopant comprises a pentacyclic fused ring core that includes one boron atom and two heteroatoms as ring-forming atoms, and at least one amine substituent of the fused ring core; the at least one amine substituent is substituted with at least one substituted or unsubstituted pyrenyl group; and a difference between a triplet state energy level of the first fluorescent dopant and a singlet state energy level of the first fluorescent dopant is equal to or greater than about 0.4 eV.

Abstract: A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first compound, a second compound, a transition metal-containing compound, and a delayed fluorescence compound, the first compound being a hole transport material, and the second compound being an electron transport material, the first compound and the second compound form an exciplex, the first compound, the second compound, or any combination thereof is substituted with at least one deuterium, and an absolute value of a triplet charge transfer state-singlet ground state non-radiative decay rate constant of a mixture of the first compound and the second compound is decreased, compared to a case in which the first compound, the second compound, or any combination thereof is not substituted with deuterium.

Abstract: A composition includes a first compound and a second compound different from the first compound and satisfies Expressions 1 and 2: PLQY ? ( E ) > 70 ? % Expression ? 1 T < 10 ? ?s , Expression ? 2 wherein, in Expressions 1 and 2, PLQY(E) is a photoluminescence quantum yield measured with respect to a first film, ?0 is a decay time measured with respect to a second film, the first film includes the first compound, and the second film includes the first compound and the second compound.

Abstract: A light-emitting device includes an emission layer including a first host, a second host, a first dopant, and a second dopant. The first dopant is a metal-containing compound, the second dopant is a boron-containing compound, the first host and the second host combine to form a host exciplex, the host exciplex is in a triplet (T1) state, and the host exciplex in the T1 state is also in a local-excitation state.

Abstract: A light-emitting device including a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including an emission layer is provided. The emission layer includes a sensitizer and an emitter and a spectral overlap integral of an emission spectrum of the sensitizer and an absorption spectrum of the emitter is at least 1×1013 M?1 cm4. A highest occupied molecular orbital (HOMO) energy level of the sensitizer is greater than a HOMO energy level of the emitter, and the spectral overlap integral is evaluated by Equation 1: J ? ( ? ) = ? 0 ? ? ? ( ? ) ? ? 4 ? F D ( ? ) ? d ? ? .

Abstract: Embodiments provide a light-emitting device that include a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode. The interlayer includes an emission layer, and the emission layer includes a first emission layer and a second emission layer. The first emission layer includes a first host and a first-first dopant, or a first host, a first-first dopant, and a first-second dopant. The second emission layer includes a second host and a second-first dopant, or a second host, a second-first dopant, and a second-second dopant. The emission layer includes the first-second dopant and/or the second-second dopant, the first emission layer and the second emission layer directly contact each other, and a thickness of the second emission layer is greater than a thickness of the first emission layer.

Abstract: A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including a reverse potential layer and an emission layer, where a sign of a giant surface potential value of the reverse potential layer is opposite to a sign of a giant surface potential value of the emission layer.

Abstract: A light emitting device of an embodiment includes a first light emitting unit including a first emission layer, and a second light emitting unit including a second emission layer. The first emission layer includes a first host, a phosphorescence sensitizer, a first fluorescence dopant, the second emission layer includes a second host which is different from the first host, and a second fluorescence dopant, the first fluorescence dopant has a highest occupied molecular orbital (HOMO) energy level of about ?5.2 eV or less, and the second fluorescence dopant has a HOMO energy level of about ?5.2 eV or more.

Abstract: Embodiments provide an organic light-emitting device and an electronic apparatus including the organic light-emitting device. The organic light-emitting device includes a first electrode, a second electrode facing the first electrode, m light-emitting units stacked between the first electrode and the second electrode and each including an emission layer, and m?1 charge generation layers between adjacent ones of the m light-emitting units, wherein m is an integer of 2 or more, at least one of the emission layers of the light-emitting units includes a first emission layer and a second emission layer, the first emission layer includes a first host, a second host, a first dopant, and a second dopant, the second emission layer includes a third host and a third dopant.

Abstract: A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer disposed between the first electrode and the second electrode and including an emission layer; wherein the interlayer further includes: a layer A including an oxide of an inorganic compound; a layer B adjacent to an upper portion of the layer A and including an oxide of an inorganic compound; and a layer C adjacent to a lower portion of the layer A and including an oxide of an inorganic compound, and relationships between a refractive index a of the layer A, a refractive index b of the layer B, and a refractive index c of the layer C satisfy the Equations (1) and (2) defined herein.

Abstract: Provided are a light-emitting device and an electronic apparatus including the same. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode. The interlayer includes an emission layer, and a hole transport region between the first electrode and the emission layer. The emission layer includes a transition metal-containing organometallic compound. The hole transport region includes an electron-blocking layer. The electron-blocking layer includes a first electron-blocking material and a second electron-blocking material, and the first electron-blocking material and the second electron-blocking material have different hole mobilities.

Abstract: A light-emitting device including a first electrode, a second electrode facing the first electrode, and an interlayer arranged between the first electrode and the second electrode and including an emission layer is provided. The emission layer includes a first emission layer and a second emission layer. The first emission layer includes a phosphorescent emitter and a first host. The second emission layer includes a fluorescent emitter and a second host. The phosphorescent emitter is configured to emit a first light having a first emission spectrum, and the first light is blue light.

Abstract: Provided is a light-emitting device including: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a layer including a Pt complex, and the layer has a thickness of greater than 0 ? and less than 10 ?.

Abstract: A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes a first emission layer including a first host, a second host, and a first dopant, and a second emission layer including a third host, a fourth host, and a second dopant, the first host and the third host are hole transport hosts, the second host and the fourth host are electron transport hosts, the first dopant and the second dopant are phosphorescent dopants including platinum, and the second host has a T1 energy value (T1_H2) and the fourth host has a T1 energy value (T1_H4) that satisfy the Equation (1) T1_H2>T1_H4 or Equation (2) T1_H2<T1_H4.

Abstract: An organic electroluminescence device according to an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an exciton diffusion layer disposed on the hole transport region and including a first host represented by Formula 1, an emission layer disposed on the exciton diffusion layer and including a second host, a third host, and a phosphorescent dopant, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The organic electroluminescence device exhibits high efficiency and a long service life.

Abstract: A light emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer disposed between the first electrode and the second electrode and including a stack of emission layers. The stack of emission layers includes two or more emission layers, a quantum well layer, a hole transport host, and an electron transport host. The quantum well layer includes a hole transport compound, and an absolute value of highest occupied molecular orbital (HOMO) energy of the hole transport compound is greater than an absolute value of HOMO energy of the hole transport host.