An organic electroluminescence device comprising: an anode, a cathode, and an emitting region between the anode and the cathode, wherein the emitting region comprises a first emitting layer and a second emitting layer, the first emitting layer and the second emitting layer are directly adjacent to each other, the first emitting layer is between the anode and the second emitting layer, and one of the first emitting layer and the second emitting layer comprises a compound having at least one deuterium atom.

The present specification relates to an organic light emitting device including Compound (A) represented by Chemical Formula 1 and Compound (B) represented by any one of Chemical Formulae 2 to 4.

The present application relates to a nitrogen-containing compound. The structural formula of the nitrogen-containing compound is as shown in a Formula 1, in which a ring A and a ring B are each independently selected from a benzene ring or a fused aromatic ring with 10 to 14 ring-forming carbon atoms, and at least one of the ring A and the ring B is selected from the fused aromatic ring with 10 to 14 ring-forming carbon atoms; L is selected from a single bond, a substituted or unsubstituted arylene group with 6 to 30 carbon atoms, and a substituted or unsubstituted heteroarylene group with 3 to 30 carbon atoms; and Het is a substituted or unsubstituted nitrogen-containing heteroaryl group with 3 to 30 carbon atoms. The nitrogen-containing compound of the present application can improve the luminous efficiency of an organic electroluminescent device and the conversion efficiency of a photoelectric conversion device using the nitrogen-containing compound.

##STR00001##

An organic electroluminescence device includes an anode, an emitting layer, and a cathode in this order. The emitting layer comprises a delayed fluorescent compound M2 and a compound M3 having at least one deuterium atom, and the compound M3 is not a compound having a partial structure represented by a formula (1C) or (2C). S.sub.1(M2) of the compound M2 and S.sub.1(M3) of the compound M3 satisfy a relationship of S.sub.1(M3)>S.sub.1(M2). In the formulae (1C) and (2C), Y.sub.41 to Y.sub.48 are each independently a N atom, CR, or a C atom bonded to another atom or the like in the compound M3, where each R is independently a H atom or a substituent, at least one of Y.sub.41 to Y.sub.48 is a N atom, and at least one of Y.sub.41 to Y.sub.48 is a C atom bonded to another atom or the like in the compound M3.

##STR00001##

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to organic electroluminescent devices which comprise these compounds.

A compound represented by the following formula (A1) (X.sub.1 is O or S; two or more of Y.sub.1, Y.sub.2, and Y.sub.3 are N; and Ar.sub.1 is an aryl group including 6 to 50 ring carbon atoms, comprising a benzene ring having at least substituent Ar.sub.2 at the ortho-position; Ar.sub.2 is an aryl group; and Ar.sub.3 is a predetermined group).

##STR00001##

An organic light emitting device comprising a first electrode, a second electrode provided to face the first electrode, and a light emitting layer provided between the first electrode and the second electrode and including a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, the organic light emitting device which exhibits low driving voltage, high emission efficiency, and long lifespan characteristics.

##STR00001##

An organic electroluminescence device includes: an anode; a cathode; and an emitting layer provided between the anode and the cathode, in which the emitting layer contains a delayed fluorescent compound M2 and a compound M3 represented by a formula (3) and a singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy a relationship of a numerical formula (Numerical Formula 1) below, S.sub.1(M3)>S.sub.1(M2) . . . (Numerical Formula 1). In the formula (3), A3 is a group represented by a formula (3a) or the like.

##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.