Provided is a new composition of matter for boron containing organic molecules which can be used as hosts or emitters in OLED devices. The compound can have a structure of Formula I ##STR00001##

An organic light-emitting device having improved efficiency and lifespan includes: a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer includes an emission layer, the emission layer includes a first compound, a second compound, a third compound, and a fourth compound, the first compound, the second compound, the third compound, and the fourth compound are different from each other, the third compound includes a metal element having an atomic number of 40 or more, the fourth compound includes boron (B), the third compound and the fourth compound each satisfy Conditions 1-1 and 1-2 below, and the fourth compound satisfies Condition 2 or 3:

T.sub.1(C3).sub.onset≥S.sub.1(C4).sub.onset  Condition 1-1

T.sub.1(C3).sub.max≥S.sub.1(C4).sub.max  Condition 1-2

K.sub.RISC(C4)≥10.sup.3 S.sup.−1  Condition 2

f(C4)≥0.1.  Condition 3

The present invention relates to organic electroluminescent devices comprising a light-emitting layer B comprising a host material H.sup.B, a first thermally activated delayed fluorescence (TADF) material E.sup.B, and a depopulation agent S.sup.B.

A compound of Chemical Formula 1, and an organic light emitting device including the same, the compound used as a material of an organic material layer of the organic light emitting device and providing high color purity and enhanced lifetime properties.

##STR00001##

A compound of the following structure has excellent luminescence characteristics. One of X.sup.1 and X.sup.2 is N and the other is B, and R.sup.1 to R.sup.26, A.sup.1, and A.sup.2 are H or substituents.

##STR00001##

A light emitting diode includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer disposed between the first electrode and the second electrode. The at least one functional layer includes a compound represented by Formula 1, thereby exhibiting high efficiency and long lifespan.

##STR00001##

Provided are a heterocyclic compound represented by Formula 1-1 or 1-2, an organic light-emitting device including the heterocyclic compound, and an electronic apparatus including the organic light-emitting device:

##STR00001## wherein Formulae 1-1 and 1-2 are respectively the same as described in the present specification.

A light-emitting device includes: an OLED substrate including a structure wherein at least one blue emission unit and at least one green emission unit are stacked, and wherein the OLED substrate emits blue light and green light; and a color control unit located in a path of light emitted from the OLED substrate, wherein at least one green emission unit includes a first compound and a second compound, the first compound emits first light having a first spectrum, and λP(1) is a first emission peak wavelength, the second compound emits second light having a second spectrum, and λP(2) is a second emission peak wavelength, an absolute value of the difference between λP(1) and λP(2) is from 0 nanometer to about 30 nanometer, and λP(1) and λP(2) are each independently from about 500 nanometer to about 570 nanometer.

A compound of Formula I,

##STR00001##

is provided. In Formula I, one of Z.sup.1, Z.sup.2, and Z.sup.3 is N and the remainder are C; each of L.sup.1 and L.sup.2 is independently selected from a direct bond and a linking group; at least one of R.sup.1, R.sup.2, R.sup.A, R.sup.B, R.sup.C, R.sup.D, and R.sup.E comprises a group R* having a structure selected form
the group consisting of Formula II, -Q(R.sup.3)(R.sup.4).sub.a(R.sup.5).sub.b, Formula III,

##STR00002##

and
Formula IV,

##STR00003##

Each R, R′, R″, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, R.sup.F, R.sup.G, and R.sup.H is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.

The invention relates to a an organic electroluminescent device comprising a light-emitting layer B comprising a host material H.sup.B, a first thermally activated delayed fluorescence (TADF) material EB, and an emitter material S.sup.B.