A compound is represented by a formula (1) below, in which k is an integer of 0 or more, m is an integer of 1 or more, n is an integer of 2 or more. L is a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 30 ring carbon atoms, CN is a cyano group, and D.sub.1 and D.sub.2 are each independently represented by one of a formula (2), a formula (3) and formula (3x) below, D.sub.1 and D.sub.2 being optionally mutually the same or different. ##STR00001##

The present invention includes organic compounds with two substituted triazine, pyridine, pyrimidine or pyrazine rings attached to an aromatic or heteroaromatic ring system. The compounds are expected to improve OLED performance.

The invention relates to an optoelectronic material comprising a compound, wherein the compound comprises: (i) one or more cations, A; (ii) one or more first B cations, B.sup.n+; (iii) one or more second B cations, B.sup.m+; and (iv) one or more chalcogen anions, X; wherein the one or more first B cations, B.sup.n+ are different from the one or more second B cations, B.sup.m+; n represents the oxidation state of the first B cation and is a positive integer of from 1 to 7 inclusive; m represents the oxidation state of the second B cation and is a positive integer of from 1 to 7 inclusive; and n+m is equal to 8.

Provided is an organic light emitting device having between the cathode and a light emitting layer an an organic material layer containing a compound of any one of the following Chemical Formulae 1-2 to 1-4: ##STR00001## wherein: X1 to X3 are each independently N or CH, and at least one of X1 to X3 is N; L1 is a substituted or unsubstituted monocyclic arylene group having 6 to 24 carbon atoms; Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted monocyclic or polycyclic aryl group having 6 to 20 carbon atoms; and Z1 is deuterium;
and an organic material layer provided between the anode and the light emitting layer and including a spirobifluorene-monoamine based compound of Chemical Formula 2: ##STR00002##

An organometallic compound represented by Formula 1:
M(L.sub.1)(L.sub.2)  Formula 1
wherein in Formula 1, M, L.sub.1, and L.sub.2 are the same as described in the specificaiton.

The present invention relates to a composition comprising a semiconducting light emitting nanoparticle.

Disclosed are an n-type semiconductor including compound represented by Chemical Formula 1 or Chemical Formula 2, an image sensor, and an electronic device. ##STR00001## In Chemical Formula 1 and Chemical Formula 2, each substituent is as defined in the detailed description.

Provided by the present disclosure are a quantum dot structure, a quantum dot light emitting device, and a manufacturing method. The quantum dot structure comprises: a quantum dot body; a first ligand, the first ligand being connected to one side surface of the quantum dot body by means of a first coordinate bond, and the first ligand having the property of regulating the transmission rate of a first charge carrier; and a second ligand, the second ligand being connected to another side surface of the quantum dot body by means of a second coordinate bond, and the second ligand having the property of regulating the transmission rate of a second charge carrier, where the charge polarities of the second charge carrier and the first charge carrier are different.

Provided are a display substrate and a display apparatus. The display substrate includes a drive circuit layer and a light emitting structure layer stacked on a substrate. The light emitting structure layer includes an anode, a cathode, and an emitting layer, a hole block layer, and an electron transport layer disposed between the anode and the cathode; the hole block layer and the electron transport layer satisfy: EETL/EHBL>1; where EETL is the electromigration rate of the electron transport layer, and EHBL is the electromigration rate of the hole block layer.

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, lifetime and/or power efficiency properties.