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##

Formulae 1-1 and 1-2 may each be understood by referring to the descriptions of Formulae 1-1 and 1-2 provided herein.

An organic compound of formula (1) ##STR00001##
useful as a material of an organic electroluminescence device is disclosed. The same definition as described in the present invention.

An organic light-emitting device includes first and second electrodes and a light-emitting layer disposed between the first and second electrodes. The light-emitting layer contains first and second compounds. The first compound is represented by formula [1] or [2]. The second compound is a hydrocarbon compound. In formulae [1] and [2], R.sub.1 to R.sub.12 and R.sub.21 to R.sub.32 are each independently selected from a hydrogen atom, alkyl groups, and other groups. Each m is an integer of 1 or more and 3 or less, and each n is an integer of 0 or more and 2 or less, provided that m+n is 3. Each X is a bidentate ligand. Each partial structure IrX is any of the structures illustrated in formulae [3] to [5]. In formulae [3] to [5], R.sub.41 to R.sub.55 are each independently selected from a hydrogen atom, alkyl groups, and other groups.

##STR00001##

A light-emitting device includes a first emission layer and a second emission layer, wherein the first emission layer includes a first hole-transporting host (HTH1), a first electron-transporting host (ETH1), and a first phosphorescent dopant (G1), and the second emission layer includes a second hole-transporting host (HTH2), a second electron-transporting host (ETH2), and a second phosphorescent dopant (G2). The electron mobility of the ETH1 is faster than the electron mobility of the ETH2, the hole mobility of the HTH2 is faster than the hole mobility of the HTH1, and the HTH1 and/or HTH2 includes deuterium.

An organic compound is represented by formula [1]. In formula [1], L and L′ are bidentate ligands different from each other, a partial structure IrL.sub.m is a partial structure represented by formula [2], and a partial structure IrL′.sub.n is a partial structure represented by formula [3-1] or formula [3-2].

##STR00001##

A light-emitting device with high resistance to heat in a fabrication process is provided. The light-emitting device includes an EL layer between an anode and a cathode, and the EL layer includes at least a light-emitting layer. The light-emitting device includes, between the light-emitting layer and the cathode, a first layer in contact with the light-emitting layer. The light-emitting layer includes a light-emitting substance, a first organic compound, and a second organic compound. The first layer includes a third organic compound different from the first organic compound and the second organic compound. The light-emitting substance emits green to yellow light. The third organic compound includes a bicarbazole skeleton and a heteroaromatic ring skeleton including one selected from a pyridine ring, a diazine ring, and a triazine ring.

The present disclosure relates to an organic electroluminescent compound comprising a ligand represented by formula 1, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, it is possible to provide an organic electroluminescent device having higher luminous efficiency and/or longer lifetime properties compared to a conventional organic electroluminescent device.

The present invention relates to organic electroluminescent devices comprising a light-emitting layer B comprising a triplet-triplet annihilation (TTA) material, a thermally activated delayed fluorescence (TADF) material and a near-range-charge-transfer (NRCT) emitter material, which exhibits a narrow—expressed by a small full width at half maximum (FWHM)—emission. Further, the present invention relates to a method for obtaining a desired light spectrum and achieving suitable (long) lifespans of an organic electroluminescent device according to the present invention.

Provided are a polycyclic compound represented by Formula 1 and an organic light-emitting device and an electronic apparatus, each including the same.

This invention relates to an iridium metal complex. The iridium metal complex comprises no more than three 1,3-dihydro-2H-benzo[d]imidazol-2-ylidene based carbene cyclometalate ligands. The iridium metal complex provides a blue emission. This is useful for organic light emitting diode (OLED) components where blue emitters have trailed behind the advances of red and green emitters.