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. The interlayer includes an emission layer and a hole transport layer between the first electrode and the emission layer. The emission layer includes a first host, a second host, and a dopant, wherein the first host includes a hole-transporting host, and the second host includes an electron-transporting host or a bipolar host. The hole transport layer includes multiple hole transport layers, the hole transport layers each include a carbazole-based compound, and highest occupied molecular orbital (HOMO) energy levels of the carbazole-based compounds respectively included in neighboring ones of the hole transport layers are different from each other.

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. The interlayer includes an emission layer and a hole transport layer between the first electrode and the emission layer. The emission layer includes a first host, a second host, and a dopant, wherein the first host includes a hole-transporting host, and the second host includes an electron-transporting host or a bipolar host. The hole transport layer includes multiple hole transport layers, the hole transport layers each include a carbazole-based compound, and highest occupied molecular orbital (HOMO) energy levels of the carbazole-based compounds respectively included in neighboring ones of the hole transport layers are different from each other.

A light emitting element that includes a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode is provided. The at least one functional layer includes a polycyclic compound represented by a specific chemical structure, and has a high efficiency and low driving voltage properties.

A light emitting element that includes a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode is provided. The at least one functional layer includes a polycyclic compound represented by a specific chemical structure, and has a high efficiency and low driving voltage properties.

A compound comprising a ligand L.sub.A, having a structure of Formula I,

##STR00001##

is provided. In Formula I, A.sup.1 to A.sup.8 are each independently CR or N; at least two adjacent ones of A.sup.1 to A.sup.8 are CR and the Rs are joined together to form a six-membered ring fused to ring A or ring C; X is O, S, or Se; each R and R.sup.B is independently hydrogen or a substituent; any adjacent substituents are optionally joined or fused into a ring; the ligand L.sub.A is coordinated to a metal M; the metal M is bonded to ring A through a M-C bond; the metal M can be coordinated to other ligands; and the ligand L.sub.A is optionally linked with other ligands. Formulations, OLEDs, and consumer products containing such compounds are also disclosed.

An organometallic compound represented by Formula 1:

M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1

wherein, M is a transition metal, L.sub.1 and L.sub.2 are ligands as provided herein, n1 and n2 are each independently 1 or 2, the sum of n1 and n2 is 2 or 3, and L.sub.1 is different from L.sub.2.

The present disclosure relates to an organic compound. The structure of the organic compound consists of a structure represented by formula (I) and a structure represented by formula (II); the structure represented by formula (I) is fused with the structure represented by formula (II); and * represents a connection point, in formula (I), capable of being fused with formula (II). When being used to the organic light-emitting layer of an organic electroluminescent device, the organic compound of the present application can effectively improve the device efficiency of the device and prolong the service life of the organic electroluminescent device.

##STR00001##

The present disclosure relates to an organic compound. The structure of the organic compound consists of a structure represented by formula (I) and a structure represented by formula (II); the structure represented by formula (I) is fused with the structure represented by formula (II); and * represents a connection point, in formula (I), capable of being fused with formula (II). When being used to the organic light-emitting layer of an organic electroluminescent device, the organic compound of the present application can effectively improve the device efficiency of the device and prolong the service life of the organic electroluminescent device.

##STR00001##

Provided are a condensed cyclic compound having the following structure: ##STR00001##
wherein ring D.sub.1 and ring D.sub.2 are each independently a C.sub.6-C.sub.20 aromatic ring, and an organic light-emitting device including the same.

A light-emitting element includes an anode electrode, cathode electrode, an EML, and an HTL. The HTL includes a hole transport material, and a first polymer containing a polysiloxane bond in the main chain and having a functional group including a π-conjugated electron pair in a side chain of the first polymer.