Provided are compounds comprising a first ligand L.sub.A; wherein L.sub.A comprises a 5-membered heterocycle joined to a metal M by a M-C or M-N bond; wherein the 5-membered heterocycle comprises at least one boron atom; wherein M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au; and wherein L.sub.A does not comprise a structure of Formula I.

##STR00001##

wherein X is B or N; with the proviso that the 5-membered heterocycle does not comprise a B—B bond; and with the proviso that if M is Pd or Pt and the 5-membered heterocycle is fused to a benzene ring, the benzene ring is not part of a 6-membered chelate ring comprising M. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.

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##

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##

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.

An organic electroluminescence device of an embodiment includes a first electrode, a second electrode facing the first electrode, and organic layers disposed between the first electrode and the second electrode, wherein the organic layers include at least one organic layer that includes a fused polycyclic compound represented by Formula 1, thereby showing improved emission efficiency.

##STR00001##

The present disclosure relates to a boron compound useful in an organic light-emitting diode and an organic light-emitting diode comprising same and, more particularly, to a boron compound represented by [Chemical Formula A], wherein [Chemical Formula A] is as defined in the description.

A compound is represented by a formula (1). n is 2 to 4, m is 1 to 4, q is 0 to 3, and m+n+q=6; CN is a cyano group; D.sub.1 is a group represented by a formula (2), (3) or (3X), the plurality of D.sub.1 are the same; and Rx is a hydrogen atom or substituent. R.sub.1 to R.sub.8 are each independently a hydrogen atom or substituent. R.sub.31 to R.sub.38 and R.sub.41 to R.sub.48 are each independently a hydrogen atom or substituent; p, px and py are each independently 1 to 4; A to C are each independently a cyclic structure represented by a formula (131) or (132). R.sub.19 and R.sub.20 are each independently a hydrogen atom or substituent. X.sub.1 is a sulfur atom or the like, and * represents a bonding position with a carbon atom of a benzene ring in the formula (1).

##STR00001##

The present invention relates to a novel polycyclic compound employed in an organic layer of an organoelectro luminescent device, wherein the organoelectro luminescent device employing the compound according to the present invention has remarkably improved luminous efficiency. According to the present invention, it is possible to implement a highly efficient organoelectro luminescent device that can be effectively applied to various display devices.

An organic electroluminescence device includes: a first emitting layer including a first host material, a first organic material, and a first dopant material; and a second emitting layer including a second host material and a second dopant material, in which the first host material, the first organic material, and the second host material are different compounds in structure and satisfy Numerical Formula 1 and Numerical Formula 2. Numerical Formula 1: T.sub.1(H1)>T.sub.1(H3), Numerical Formula 2: T.sub.1(H2)>T.sub.1(H3) (In Numerical Formula 1 and Numerical Formula 2, T.sub.1(H1), T.sub.1(H2), T.sub.1(H3) are triplet energies of the first host material, the first organic material, and the second host material, respectively.)

A compound of formula (1)

##STR00001##

wherein X.sub.1 is CR.sub.1 or a nitrogen atom, X.sub.2 is CR.sub.2 or a nitrogen atom, X.sub.3 is CR.sub.3 or a nitrogen atom, X.sub.4 is CR.sub.4 or a nitrogen atom, X.sub.5 is CR.sub.5 or a nitrogen atom, X.sub.6 is CR.sub.6 or a nitrogen atom, X.sub.7 is CR.sub.7, a nitrogen atom, or a carbon atom single-bonded to X.sub.8, X.sub.8 is CR.sub.8, a nitrogen atom, or a carbon atom single-bonded to X.sub.7, X.sub.9 is CR.sub.9 or a nitrogen atom, X.sub.10 is CR.sub.10 or a nitrogen atom, X.sub.11 is CR.sub.11 or a nitrogen atom, X.sub.12 is CR.sub.12 or a nitrogen atom, and Q is CR.sub.Q or a nitrogen atom, and Y is NR.sub.Y1, an oxygen atom, a sulfur atom, C(R.sub.Y2)(R.sub.Y3) or Si(R.sub.Y4)(R.sub.Y5), each R being a hydrogen atom or a substituent.