An electroluminescent device and a display device including the same. The electroluminescent device includes a first electrode and a second electrode facing each other; a light emitting layer disposed between the first electrode and the second electrode, the light emitting layer including a quantum dot; a hole transport layer disposed between the light emitting layer and the first electrode; and an electron transport layer disposed between the light emitting layer and the second electrode, wherein the hole transport layer, the light emitting layer, or a combination thereof includes thermally activated delayed fluorescence material, and the thermally activated delayed fluorescence material is present in an amount of greater than or equal to about 0.01 wt % and less than about 10 weight percent (wt %), based on 100 wt % of the hole transport layer, the light emitting layer, or the combination thereof including the thermally activated delayed fluorescence material.

The present disclosure provides an organic light emitting device, including a first electrode, a second electrode and an emitting layer disposed between the first electrode and the second electrode. A hole transporting layer is disposed between the first electrode and the emitting layer. An electron transporting layer is disposed between the second electrode and the emitting layer. The ratio of the hole mobility of the hole transporting layer to the electron mobility of the electron transporting layer is about 10 to 500.

An organic light-emitting device includes: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, wherein the organic layer includes an emission layer having a first layer, and the first layer includes a first compound, a second compound, and a third compound. The first compound is a hole transporting host compound, the second compound is an electron transporting host compound, and the third compound is a hole transporting host compound or an electron transporting host compound. The first compound and the second compound form a first exciplex, and the first compound and the third compound, or the second compound and the third compound form a second exciplex, where the first exciplex and the second exciplex are different from each other.

Provided is an organic electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a first organic layer, the first organic layer comprises a first compound and a second compound, the first compound has specific HOMO and/or LUMO energy levels and a structure represented by Formula 1-1, and the second compound has a specific LUMO energy level and a structure represented by Formula 2-1. Compared with the related art, the combination of the first compound and the second compound can significantly improve the performance of the organic electroluminescent device, such as the efficiency of the device. Further provided is an electronic device comprising the organic electroluminescent device.

In a light-emitting device, an emission layer includes a first emission layer and a second emission layer, the first emission layer includes a first host, the second emission layer includes a second host and a third host, and a hole mobility of the first host (μH.sub.1), a hole mobility of the second host (μH.sub.2), and a hole mobility of the third host (μH.sub.3) satisfy Expressions (1) and (2) below:

μH.sub.1>μH.sub.2  (1)

μH.sub.1>μH.sub.3  (2).

The present disclosure relates to a display substrate, a method for preparing the same, and a display device. The display substrate of the present disclosure includes a base substrate, a pixel definition layer located on the base substrate, and a first pixel and a second pixel that are adjacent to each other and defined by the pixel definition layer, in which a spacer function layer for blocking hole transport between adjacent pixels is arranged at at least a part of a contact interface between the second hole transport layer in the second pixel and the light function layer in the first pixel. By providing the spacer function layer, the present disclosure effectively prevents the migration of holes between the hole transport layers of adjacent pixels or between the hole transport layer and the light emitting layer, thereby avoiding accompanying light emission between adjacent pixels.

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, wherein the interlayer includes an emission layer, and the emission layer includes a condensed cyclic compound. An electronic apparatus includes the light-emitting device. The condensed cyclic compound is represented by Formula 1, wherein the detailed description of Formula 1 is the same as described in the specification:

##STR00001##

An organic optoelectronic device comprises a first electrode, a first carrier transport layer, an active layer, a second carrier transport layer and a second electrode. The first electrode is a transparent electrode. The active layer includes a low band gap small molecule material which includes a structure of Formula I:

##STR00001##

Wherein, o, m, n, p, x and y are independently selected from any integer from 0 to 2. Ar.sup.0, Ar.sup.1 and A.sup.2 are electron-donating groups. A.sup.0 is a heteroatom-containg tricyclic structure with or without substituents, and. the heteroatom comprises at least one of S, N, Si, and Se. A.sup.1 is an electron withdrawing group with or without substituents, and the structure of the electron-withdrawing group comprises at least one of S, N, Si, Se, C═O, —CN, SO.sub.2. The organic optoelectronic device of the present invention has good external quantum efficiency and dark current performance.

A light-emitting element having low driving voltage and high emission efficiency is provided. In the light-emitting element, a combination of a guest material and a host material forms an exciplex. The guest material is capable of converting triplet excitation energy into light emission. Light emission from the light-emitting layer includes light emission from the guest material and light emission from the exciplex. The percentage of the light emission from the exciplex to the light emission from the light-emitting layer is greater than 0 percent and less than or equal to 60 percent. The energy after subtracting the energy of light emission from the exciplex from the energy of light emission from the guest material is greater than 0 eV and less than or equal to 0.23 eV.

An organic light emitting device, comprising an anode; a cathode; and an emissive layer between the anode and the cathode, wherein the emissive layer comprises a first material which is an organic semiconductor compound and a second material which is a different organic semiconductor compound that has a spin doublet ground state; and wherein a lowest spin singlet excitation energy of the first material and a lowest spin triplet excitation energy of the first material are greater than a lowest spin doublet excitation energy of the second material; a method of fabricating an organic light emitting device, comprising: forming an emissive layer between an anode and a cathode, wherein the emissive layer comprises a first material which is an organic semiconductor compound and a second material which is a different organic semiconductor compound that has a spin doublet ground state; and wherein a lowest spin singlet excitation energy of the first material and a lowest spin triplet excitation energy of the first material are greater than a lowest spin doublet excitation energy of the second material; and a method of operating the device by applying a voltage across the device, such that spin singlet excited states and spin triplet excited states are formed for the first material, wherein energy is transferred from spin singlet excited states in the first material and spin triplet excited states in the first material to form spin doublet excited states in the second material, wherein the second material emits fluorescent light when transitioning from a spin doublet excited state to a ground state.