Provided are an organic electroluminescent material and a device comprising the same. The organic electroluminescent material is a metal complex comprising a ligand L.sub.a having a structure of Formula 1A and a ligand L.sub.b having a structure of Formula 1B. Such new compounds each have a lower evaporation temperature, which is conducive to industrial application of the material and can reduce energy consumption in industrialization. Such metal complexes are used as a light-emitting material in an electroluminescent device. When applied to the electroluminescent device, such metal complexes can provide very excellent device performance, especially an improved device lifetime. Further provided are an organic electroluminescent device comprising the metal complex and a compound composition comprising the metal complex.

Provided is a light-emitting diode and a method for preparing the same. The light-emitting diode includes an anode, a hole transport layer, a perovskite light-emitting layer, an electron transport layer and a cathode stacked in sequence, in which the perovskite light-emitting layer includes a first sublayer and a second sublayer stacked in sequence, with a material for forming the first sublayer including an inorganic perovskite material, and with a material for forming the second sublayer being an organic perovskite material.

An organic electroluminescence device comprising: a cathode, an anode, and at least one organic layer disposed between the cathode and the anode, wherein at least one layer of the at least one organic layer comprises a compound represented by the following formulas (1-1) and (1-3) or a compound represented by the following formulas (1-2) and (1-3). ##STR00001##

A light-emitting device includes a light-emitting layer, an electron transport layer provided on the light-emitting layer, and a cathode provided on the electron transport layer. A main component of the cathode is a metal boride. With the above configuration, a work function of the cathode is reduced and electron injection efficiency is improved. As a result, luminous efficiency of the light-emitting device is improved.

An organic light emitting display device includes a substrate, a pixel structure, and a touch sensor electrode. The substrate includes a sub-pixel region and a transparent region. The pixel structure is disposed in the sub-pixel region on the substrate. The touch sensor electrode is disposed in the transparent region on the substrate.

In the organic electroluminescent device having at least an anode, a hole injection layer, a first hole injection layer, a second hole injection layer, a light emitting layer, an electron transport layer and a cathode in this order, the hole injection layer includes an arylamine compound of the following general formula (1) and an electron acceptor.

##STR00001##

In the formula, Ar.sub.1 to Ar.sub.4 may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.

According to the present invention, there are provided pyrimidine derivatives represented by the following general formula (1). The pyrimidine derivatives of the invention are novel compounds and feature (1) good electron injection property, (2) high electron mobility, (3) excellent hole blocking property, (4) good stability in their form of thin films, and (5) excellent heat resistance.

##STR00001##

According to one embodiment, a light-emitting element includes a substrate, a first electrode, a second electrode, and a light-emitting layer. The substrate is light-transmissive. The second electrode is provided between the first electrode and a portion of the substrate. The second electrode is light-transmissive. A light-emitting layer is provided between the first electrode and the second electrode. The substrate includes a first region and a second region. The first region overlaps at least a portion of the light-emitting layer in a first direction, the first direction is from the second electrode toward the first electrode. The second region is provided around the first region along a plane perpendicular to the first direction. The substrate has an opening provided in at least a portion of the second region.

The present invention relates to: a compound for an organic optoelectronic diode, represented by a combination of chemical formulas 1 and 2; an organic optoelectronic diode comprising the same; and a display device comprising the organic optoelectronic diode. The detailed contents of formulas 1 and 2 are the same as those defined in the specification.

The present specification provides a compound having a spiro structure, and an organic light emitting device including the same.