The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device comprising the same.

A compound represented by the following general formula has excellent light-emitting characteristics and emits light at a short wavelength. Y.sup.1 is N—R.sup.A; Y.sup.2 is O, S, C═O or N—R.sup.A; R.sup.A is an aryl group, etc.; R.sup.1 to R.sup.11 each are a hydrogen atom or a substituent; at least one of R.sup.1 to R.sup.3 is a carbazolyl group substituted with an aryl group, etc.

##STR00001##

A light-emitting device and an electronic apparatus including the light-emitting device include a novel condensed cyclic compound represented by Formula 1, in which Z.sub.1 is a group represented by Formula 2. The condensed cyclic compound represented by Formula 1 may have a high glass transition temperature (Tg) and/or a high melting point, and may thus provide high durability during storage and driving.

##STR00001##

Provided are an organic electroluminescent material and a device comprising the same. The organic electroluminescent material is a metal complex comprising a ligand L.sub.a having a structure of Formula 1A and a ligand L.sub.b having a structure of Formula 1B. Such new compounds each have a lower evaporation temperature, which is conducive to industrial application of the material and can reduce energy consumption in industrialization. Such metal complexes are used as a light-emitting material in an electroluminescent device. When applied to the electroluminescent device, such metal complexes can provide very excellent device performance, especially an improved device lifetime. Further provided are an organic electroluminescent device comprising the metal complex and a compound composition comprising the metal complex.

An organometallic compound represented by Formula 1 emits deep blue light. A light-emitting device including the organometallic compound, and an electronic apparatus including the light-emitting device may have excellent or suitable driving voltage, luminescence efficiency, color conversion efficiency, and/or lifespan characteristics:

##STR00001##

In Formula 1, X.sub.1 to X.sub.4 are each independently C or N, Y.sub.11 is C(Z.sub.11) or N, and Y.sub.12 is C(Z.sub.12) or N.

The present disclosure provides an organic compound, an electron transport material, and an application thereof. The organic compound has a structure as shown in Formula I. Design of molecular structure and substituents enables it to undergo tridentate coordination or tetradentate coordination with metal, and more stably and firmly combination with metal, so that it has stronger stability and longer working life when used as an electron transport material, which effectively solves a problem of rising drift voltage. The organic compound has greater rigid distortion, which can suppress an increase of intermolecular attraction and prevent it from forming a planar structure to cause excessive intermolecular attraction. The organic compound is used as an electron transport material, and can be applied to an electron transport layer and/or an electron injection layer of an OLED device, which can effectively improve luminous efficiency and working life of the device, and reduce turn-on voltage.

Disclosed are a heterocyclic compound represented by Formula 1 and an organic light emitting device using the same. The heterocyclic compound is used as a material for hole injection layer, hole transport layer, hole injection and transport layer, light emission layer, electron transport layer, or electron injection layer of the organic light emitting device and provides improved efficiency, low driving voltage, and improved lifetime characteristic. ##STR00001##

An electroluminescent device comprising a first electrode and a second electrode facing each other, an emission layer disposed between the first electrode and the second electrode and including at least two light emitting particles, a hole transport layer disposed between the first electrode and the emission layer, and an electron transport layer disposed between the emission layer and the second electrode, wherein the electron transport layer comprises an inorganic layer disposed on the emission layer, the inorganic layer comprising a plurality of inorganic nanoparticles; and an organic layer directly disposed on at least a portion of the inorganic layer on a side opposite the emission layer, wherein a work function of the organic layer is greater than a work function of the inorganic layer.

The present specification provides a benzocarbazole-based compound of chemical formula 1 and an organic light-emitting device comprising same. The benzocarbazole-based compound as a material of an organic material layer of the organic light emitting device provides enhanced efficiency, low driving voltage and increased lifetime. ##STR00001##

Provided is an organic light emitting device, comprising: an anode; a cathode disposed opposite to the anode; and one or more organic material layers disposed between the anode and cathode, the organic material layer including a light emitting layer that includes a compound of Chemical Formula 1 and a compound Chemical Formula 2: ##STR00001## wherein: one of R.sub.21, R.sub.22, R.sub.23, and R.sub.24 is -L.sub.21-Ar.sub.1, and the remaining are hydrogen; and one of R.sub.31, R.sub.32, R.sub.33, and R.sub.34 is -L.sub.22-Ar.sub.2, and the remaining are hydrogen; excluding compounds where: R.sub.21 is -L.sub.21-Ar.sub.1 and R.sub.31 is -L.sub.22-Ar.sub.2, R.sub.22 is -L.sub.21-Ar.sub.1 and R.sub.32 is -L.sub.22-Ar.sub.2, R.sub.23 is -L.sub.21-Ar.sub.1 and R.sub.33 is -L.sub.22-Ar.sub.2, or R.sub.24 is -L.sub.21-Ar.sub.1 and R.sub.34 is -L.sub.22Ar.sub.2; L.sub.21 and L.sub.22 each is a single bond, or a substituted or unsubstituted C.sub.6-60 arylene; X.sub.2 is O or S; and Ar.sub.1 is Chemical Formula 3: ##STR00002##