An organic light-emitting device includes a first electrode; a second electrode facing the first electrode; an emission layer between the first electrode and the second electrode; a hole transport region between the first electrode and the emission layer; and an electron transport region between the emission layer and the second electrode, wherein the emission layer includes a first material represented by Formula 1 and a second material represented by any one of Formulae 2-1 to 2-5, and the hole transport region includes a third material represented by Formula 3. The organic light-emitting device may have high efficiency and a long lifespan.

Disclosed is an organic electroluminescent material and device. The organic electroluminescent material is a novel metal complex that comprises a ligand having a fluorene structure and a ligand having a dibenzofuran, dibenzothiophene, or dibenzoselenophene structure, and has a general formula of M(L.sub.a).sub.m(L.sub.b).sub.n(L.sub.c).sub.q, where the ligand L.sub.a has a structure represented by Formula IA, the ligand L.sub.b has a structure represented by Formula IB, and the ligand L.sub.c is a monoanionic bidentate ligand. The metal complex may be used as the light-emitting material in the organic electroluminescent device. These novel compounds can greatly improve the device efficiency and provide better device performance. Further provided are an electroluminescent device and a compound formulation.

The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by the following formula 1, and a second host material comprising a compound represented by the following formula 2, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds as a host material, it is possible to provide an organic electroluminescent device having higher luminous efficiency and/or improved lifespan characteristics compared to conventional organic electroluminescent devices.

A light-emitting device includes a first compound represented by Formula 1, for example, in an emission layer of the device as a dopant or emitter. An electronic apparatus includes the light-emitting device, and the first compound represented by Formula 1 is an organometallic compound, in which M is platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), silver (Ag), or copper (Cu): ##STR00001##

The present invention provides an organic light-emitting diode (OLED) display panel and a display device. The OLED display panel includes a light-emitting device layer and a color conversion layer arranged in sequence. The light-emitting device layer includes a third light-emitting device disposed in a region of a green subpixel. The color conversion layer includes a green conversion layer disposed in the region of the green subpixel. The green conversion layer is configured to convert light emitted by the third light-emitting device into green light to relieve a problem of a short display lifespan of current OLED display panels.

New organometallic complexes having bis- or tris-heteroleptic ligands and large aspect ratio in one direction and their use in OLEDs to enhance the efficiency is disclosed. Such compounds can have a structure of Formula III, ##STR00001##
where rings A, B, C, and D are ring; L.sup.1 and L.sup.3 each a direct bond or a linking group; n.sub.1 and n.sub.2 are 0 or 1; if n.sub.1 or n.sub.2 is 1, then L.sup.2 or L.sup.4 is a direct bond or a linking group, and if n.sub.1 or n.sub.2 is 0, L.sup.2 or L.sup.4 is not present; Q.sup.1, Q.sup.2, Q.sup.3 and Q.sup.4 are a direct bond or oxygen; ring A is trans to ring D, ring B is trans to ring C in a square-planar coordination configuration; M.sup.2 is Pt, and the compound comprises at least one Pt-carbene bond.

Disclosed is an organic electroluminescence device. The device includes an anode; a cathode; and a first light-emission layer disposed between the anode and the cathode and configured for emitting blue light. The first light-emission layer comprises a host composition and a blue dopant. The blue dopant includes at least one compound represented by Chemical Formula D. The host composition contains a first host compound and a second host compound. The first host compound has a triplet energy level higher than a triplet energy level of the blue dopant, while the second host compound has a triplet energy level lower than the triplet energy level of the blue dopant. ##STR00001## In Chemical Formula D, each of R.sub.a, R.sub.b, R.sub.c, R.sub.d and R.sub.e independently is the same as defined in the present specification.

Provided are an organic electroluminescent material and device. The organic electroluminescent material is a compound having a structure of Formula 1. Those novel compounds are applicable to electroluminescent devices and can provide better device performance, such as an increase in device lifetime. Further provided are an electroluminescent device containing the compound and a compound composition containing the compound.

An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; an organic layer disposed between the first electrode and the second electrode and includes an emission layer; and a first compound and a second compound; wherein the first compound includes a hole transport compound not including an electron transport moiety, and the second compound includes an electron transport compound including an electron transport moiety or a bipolar compound including an electron transport moiety, wherein the second compound includes deuterium.

Provided is a light-emitting device that can have sufficient device characteristics even with a smaller number of stacked layers in an EL layer and a thicker light-emitting layer than a conventional one by using, as an organic compound used for the EL layer of the light-emitting device, a material that can increase not only a property of carrier transport to the light-emitting layer but also a property of carrier injection from an electrode.