A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed: ##STR00001## In Chemical Formula 1, each substituent is the same as defined in the detailed description.

A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer including an emission layer between the first electrode and the second electrode and an electron transport region between the emission layer and the second electrode. The electron transport region includes an electron transport layer and an electron injection layer between the electron transport layer and the second electrode. The electron transport layer includes a first material and a second material, the electron injection layer includes a third material and a fourth material, and an amount of the third material is in a range of about 50 parts by weight to about 99 parts by weight, based on a total of 100 parts by weight of the electron injection layer. The first material to the fourth material are respectively the same as described in the specification.

An organic photoelectronic device includes a first electrode and a second electrode facing each other and a light-absorption layer between the first electrode and the second electrode and including a first region closest to the first electrode, the first region having a first composition ratio (p.sub.1/n.sub.1) of a p-type semiconductor relative to an n-type semiconductor, a second region closest to the second electrode, the second region having a second composition ratio (p.sub.2/n.sub.2) of the p-type semiconductor relative to the n-type semiconductor, and a third region between the first region and the second region in a thickness direction, the third region having a third composition ratio (p.sub.3/n.sub.3) of the p-type semiconductor relative to the n-type semiconductor that is greater or less than the first composition ratio (p.sub.1/n.sub.1) and the second composition ratio (p.sub.2/n.sub.2).

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed:

##STR00001##

In Chemical Formula 1, each substituent is the same as defined in the detailed description.

The invention relates to an organic molecule, in particular for the application in optoelectronic devices. According to the invention, the organic molecule is represented by a plurality of units, wherein each unit includes or consists of a structure represented by Formula IIIe-0

##STR00001##

wherein
Q.sup.1 is selected from the group consisting of C and CR.sup.III;
Q.sup.2 is selected from the group consisting of C and CR.sup.II;
Q.sup.3 is selected from the group consisting of C and CR.sup.I;
Q.sup.4 is selected from the group consisting of C and CR.sup.1;
wherein
at least one substituent selected from the group consisting of Q.sup.2 and Q.sup.3 is C; and
exactly one substituent selected from the group consisting of Q.sup.1 and Q.sup.4 is C, if only one substituent selected from the group consisting of Q.sup.2 and Q.sup.3 is C.

The invention relates to an organic molecule, in particular for the application in optoelectronic devices. According to the invention, the organic molecule has a plurality of units, wherein each unit includes or consists of a structure represented by Formula IV

##STR00001##

wherein m is an integer from 2 to 6; n = 0 or 1; and X is at each occurrence independently selected from the group consisting of a direct bond, CR.sup.3R.sup.4, C═CR.sup.3R.sup.4, C═O, C═NR.sup.3, NR.sup.3 O, SiR.sup.3R.sup.4, S, S(0) and S(O).sub.2.

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 Å and less than 10 Å.

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed: ##STR00001## In Chemical Formula 1, each substituent is the same as defined in the detailed description.

A light emitting device includes a first electrode, a hole transporting layer in contact with the first electrode, a second electrode, an electron transporting layer in contact with the second electrode; and an emissive layer between the hole transporting layer and the electron transporting layer. The emissive layer includes a metal-assisted delayed fluorescent (MADF) emitter, a fluorescent emitter, and a host, and the MADF emitter harvests electrogenerated excitons and transfers energy to the fluorescent emitter.

An organic electroluminescence device comprising: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises a compound represented by the following formula (1), and a compound A having a Stokes shift of 20 nm or smaller and an emission peak wavelength of 440 nm to 465 nm (at least one of Ar.sub.1 and Ar.sub.2 is a monovalent group having a structure represented by the following formula (2)).

##STR00001##