A metal complex containing three different ligands which may be used as a light-emitting material in a light-emitting layer of an organic electroluminescent device. These new complexes can not only achieve device performed desired to be adjusted or improved by adjusting substituents but also have the effect of effectively controlling increase of the evaporation temperature. Further disclosed are an electroluminescent device and a compound formulation including the metal complex.

A composition containing a phosphorescent compound represented by the formula (1) and a compound (F) having a condensed hetero ring skeleton containing at least one atom (a) selected from the group consisting of a nitrogen atom and a boron atom in the ring is provided. If the value of the energy level in the lowest triplet excited state of the above-described phosphorescent compound is expressed as T.sub.p (eV), the value of the energy level of the lowest triplet excited state of the above-described compound (F) is expressed as T.sub.F (eV) and the number of the above-described atom (a) in the condensed hetero ring skeleton per 1000 of the molecular weight of the above-described compound (F) is expressed as N.sub.f, then, the formula (A) and the formula (B) are satisfied:

|T.sub.P|−|T.sub.F|≥0.15  (A)

0.01≤N.sub.f≤4.5  (B)

##STR00001##

Disclosed herein are light emitting device that emit highly circularly polarized light. These devices may be used to form a dot-matrix display or an electronic information display comprised of a series of photopolymerizable, chiral liquid crystalline layers that can be solvent cast on a substrate. The mixture of chiral materials in each successive layer may be blended in such a way that each layer has the same chiral pitch and may also be blended so that the ordinary and extraordinary refractive indices in each layer match the other layers such that the complete assembly of layers will optically function as a single relatively thick layer or chiral liquid crystal. The chiral nematic material in each layer can spontaneously adopt a helical structure with a helical pitch. Further disclosed are pixel structures that not only emit light with brightness and chromaticity information, but also depth of focus information as well.

A light-emitting device and an electronic apparatus including the same are provided. The light-emitting device includes an emission layer that includes a first emission layer and a second emission layer.

An organic light emitting diode includes an anode, an emission layer disposed on the anode and including a host, a phosphorescent dopant represented by Chemical Formula 1 and a fluorescent dopant represented by Chemical Formula 2, and a cathode disposed on the emission layer formed by mixing the fluorescent dopant with the phosphorescent dopant including an acceptor at a specific site, thereby energy loss during an emission process can be minimized and energy transfer efficiency can be improved and an organic light emitting diode with excellent luminous efficiency and an organic light emitting display device having the same can be achieved.

An organic light emitting diode display device includes a substrate having a plurality of subpixels; and an emitting material layer in the plurality of subpixels on the substrate, wherein the emitting material layer in at least one of the plurality of subpixels comprises: a first emitting material layer including a first host and a dopant; a second emitting material layer on the first emitting material layer and including a second host and the dopant; and a third emitting material layer on the second emitting material layer and including one of the dopant and the second host.

A novel light-emitting element is provided. A light-emitting element with a long lifetime is provided. A light-emitting element with high emission efficiency is provided. In the light-emitting element, an EL layer includes a hole-injection layer, a first hole-transport layer, a second hole-transport layer, a third hole-transport layer, a light-emitting layer, a first electron-transport layer, and a second electron-transport layer in this order; the hole-injection layer includes an organic acceptor; the LUMO level of the host material is higher than that of the first electron-transport layer; the LUMO level of the second electron-transport layer is higher than that of the first electron-transport layer; the host material is a substance including a condensed aromatic ring skeleton; and the first and second electron-transport layers each include a substance having a heteroaromatic ring skeleton.

An organic electroluminescent element including a luminescent compound represented by the following formula (in which R.sup.1 to R.sup.14 each independently represent a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, a heteroaryl group, a fluorine atom, a cyano group, an amino group, an alkoxy group, an aryloxy group, a thio group, or a silyl group, and 8 to 13 groups out of R.sup.1 to R.sup.14 each represent a hydrogen atom or a deuterium atom) in a light emitting layer has high durability and excellent chromaticity. ##STR00001##

An organometallic compound represented by Formula 1: ##STR00001## wherein, in Formula 1, groups and variables are the same as described in the specification.

A compound having a structure of the formula Ir(L.sub.A)(L.sub.B), in which L.sub.A is a bidentate, tridentate, tetradentate, pentadentate, or hexadentate ligand and L.sub.B is a monodentate, bidentate, tridentate, or tetradentate ligand, or not present, and where the total denticity of L.sub.A plus L.sub.B is 6, and L.sub.A includes at least one structure of Formula I: ##STR00001##
is disclosed as a useful phosphorescent emitter compound.