A organic light-emitting element including a positive electrode, a light-emitting layer, and a negative electrode in this order, wherein the light-emitting layer contains a dopant material, a host material, and an assist material, the dopant material is a compound represented by the following general formula [1], the host material is a hydrocarbon compound, and the assist material has a lower LUMO level than the host material. In the formula [1], R.sub.1 to R.sub.10 denote a hydrogen atom, an alkyl group, or the like. X denotes O or S. m denotes an integer in the range of 1 to 3, and n denotes an integer in the range of 0 to 2, provided that m+n is 3. The partial structure IrL.sub.n is any one of structures represented by the following formulae [2] and [3], wherein R.sub.11 to R.sub.21 denote a hydrogen atom, an alkyl group, or the like.

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An organic light emitting device comprises an anode, a first hole transport layer positioned over the anode, a barrier transport layer positioned over the first hole transport layer, a second hole transport layer positioned over the barrier transport layer, at least one emissive layer positioned over the second hole transport layer, and a cathode positioned over the at least one emissive layer.

Provided is an OLED device, which includes a first electrode, a second electrode, and a first light emitting unit located between the first electrode and the second electrode. An absorption rate of the first electrode for blue light is greater than an absorption rate of the first electrode for red light, and the absorption rate of the first electrode for blue light is greater than an absorption rate of the first electrode for green light. The first light emitting unit includes a light emitting layer and a hole functional unit located between the first electrode and the light emitting layer. The hole functional unit at least includes at least two hole functional layers, and any hole functional layer includes a second functional layer for injecting holes and a third functional layer for transporting holes which are stacked along a direction away from the first electrode.

The resolution of a display apparatus having a light detection function is increased. A display apparatus includes a plurality of transistors and a light-emitting and light-receiving device in a subpixel. The light-emitting and light-receiving device has a function of emitting light of a first color and a function of receiving light of a second color. One of a source and a drain of a first transistor is electrically connected to a first wiring, and the other thereof is electrically connected to a gate of a second transistor. One electrode of the light-emitting and light-receiving device is electrically connected to one of a source and a drain of the second transistor, one of a source and a drain of a third transistor, and one of a source and a drain of a fifth transistor. One of a source and a drain of a fourth transistor is electrically connected to a second wiring, and the other thereof is electrically connected to the other of the source and the drain of the third transistor.

An organic electroluminescent device is disclosed. The organic electroluminescent device includes a light-emitting layer that contains a plurality of hosts and dopants, where one of the plurality of hosts includes the same material as in an electron transport auxiliary layer in an electron transport region, whereby the organic electroluminescent device simultaneously exhibits effects such as low driving voltage, high luminous efficiency, and a long lifespan.

The present invention relates to organic electroluminescent devices, the emitting layer thereof containing a blend of a luminescent material having a narrow singlet-triplet gap and a fluorescent emission material having high steric shielding.

An electroluminescent device, a display substrate, and a display apparatus. The electroluminescent device comprises: an electron transport layer (1) and a quantum dot light emitting layer (3) that are arranged in a stack mode; and an ionic complex layer (2) located between the electron transport layer (1) and the quantum dot light emitting layer (3), wherein a built-in electric field is formed in the ionic complex layer (2).

An organometallic compound including a first ligand L.sub.A selected from

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is provided. In ligand L.sub.A, each of Y.sup.1 to Y.sup.10 is carbon or nitrogen; moiety B is a monocyclic or polycyclic fused ring structure comprising 5-membered and/or 6-membered rings; any two R.sub.A and R.sub.B can be fused or joined to form a ring; X is selected from O, S, Se, or NR; each R.sub.A and R.sub.B is independently hydrogen or a General Substituent; at least one R, R.sub.A, or R.sub.B is deuterium or a linking group between L.sub.A and another ligand that includes a deuterium substituted aromatic ring; and L.sub.A is coordinated to a metal M, selected from Os, Pd, Pt, Ir, Cu, Ag, or Au; and the compound is capable of emitting light with a peak maximum wavelength (λ.sub.max)≥700 nm at room temperature.

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 and a second emission layer contacting each other, the first emission layer includes a first host and a first dopant, the second emission layer includes a second host and a second dopant, the first dopant includes a fluorescent dopant, the second dopant includes a phosphorescent dopant, a triplet energy level of the first host is lower than a triplet energy level of the first dopant, and a triplet energy level of the second host is higher than a triplet energy level of the second dopant.

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 first layer, wherein the first electrode has a work function value of about −5.5 eV to about −6.1 eV, and the interlayer includes a second layer doped with a non-lead-based perovskite compound.