Disclosed are a composition for an organic optoelectronic device including a first compound represented by Chemical Formula 1, and a second compound represented by Chemical Formula 2, and an organic optoelectronic device and a display device including the same.

The contents of Chemical Formula 1 and Chemical Formula 2 are as defined in the specification.

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 I

##STR00001##

wherein

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(O) and S(O).sub.2.

An organic light-emitting device having low-driving voltage, improved efficiency, and long lifespan includes: a first electrode; a second electrode facing the first electrode; a first layer between the first electrode and the second electrode, the first layer including a first compound; a second layer between the first layer and the second electrode, the second layer including a second compound; and a third layer between the second layer and the second electrode, the third layer including a third compound; wherein the first compound does not include a nitrogen-containing heterocyclic group comprising *═N—*′ as a ring forming moiety, and wherein the first compound, the second compound, and the third compound each independently include at least one group selected from groups represented by Formulae A to C: ##STR00001##

The present specification provides a multicyclic compound including nitrogen and an organic light emitting device using the same.

The embodiments of the present disclosure relate to display technology and provide a pixel driving circuit and an associated driving method, a display panel and a display apparatus, capable of avoiding influence of a drifting threshold voltage of a driving transistor on a driving current of an active light emitting device. The pixel driving circuit comprises a compensating unit, a data writing unit, a driving unit, a first energy storage unit, a second energy storage unit and a display unit. The embodiments of the present disclosure are applicable to display manufacture.

An organic light-emitting device having low-driving voltage, improved efficiency, and long lifespan includes: a first electrode; a second electrode facing the first electrode; a first layer between the first electrode and the second electrode, the first layer including a first compound; a second layer between the first layer and the second electrode, the second layer including a second compound; and a third layer between the second layer and the second electrode, the third layer including a third compound; wherein the first compound does not include a nitrogen-containing heterocyclic group comprising *═N—*′ as a ring forming moiety, and wherein the first compound, the second compound, and the third compound each independently include at least one group selected from groups represented by Formulae A to C: ##STR00001##

Novel phosphorescent metal complexes containing ligands having the Formula I: ##STR00001##
bearing either a naphthalene or other fused heterocycle moieties such as benzofuran and benzothiophene useful as emitters in OLEDs and improve the device efficiency and the FWHM of the emission.

A light-emitting device includes a heterocyclic compound represented by Formula 1, an electronic apparatus includes the light-emitting device, and the heterocyclic compound is represented by Formula 1:

##STR00001##

Formula 1 is the same as described in the present specification.

The present disclosure relates to a plurality of host materials comprising at least one first host compound represented by formula 1 and at least one second host compound represented by formula 2 and an organic electroluminescent device comprising the same. By comprising the specific combination of compounds according to the present disclosure as the host materials, an organic electroluminescent device having low driving voltage, high luminous efficiency, and/or significantly improved lifespan characteristics can be provided.

A novel organic compound that is highly convenient, useful, or reliable is provided. The organic compound is represented by General Formula (G0) below.

##STR00001##

Note that in General Formula (G0), R.sup.101 to R.sup.111 each independently represent hydrogen or an alkyl group having 1 to 6 carbon atoms, n is 1 or 2, and L represents a ligand represented by General Formula (L0).

##STR00002##

In General Formula (L0), R.sup.201 to R.sup.208 each independently represent hydrogen, deuterium, or an alkyl group having 1 to 6 carbon atoms, and some or all of hydrogen atoms of the alkyl group may be substituted by deuterium.