The present disclosure provides an OLED display panel, comprising a substrate and a plurality of pixel regions disposed on the substrate and emitting light in different colors. A pixel region includes a first electrode, a first auxiliary light-emitting layer, a light-emitting layer, a second auxiliary light-emitting layer, and a second electrode. A micro-cavity structure is formed between the first electrode and the second electrode. The second auxiliary light-emitting layer includes at least a first sub-auxiliary light-emitting layer. The second auxiliary light-emitting layer corresponding to the pixel regions emitting light in at least one color also includes a second sub-auxiliary light-emitting layer. At least one of the first sub-auxiliary light-emitting layer and the second sub-auxiliary light-emitting layer is made of at least a first electron-type material. The second sub-auxiliary light-emitting layer has a zero-field electron mobility greater than or equal to a pre-determined threshold.

A material for organic electroluminescent display device includes a luminescent dopant part and an assist dopant part. The luminescent dopant part may have an energy of 2.6 eV or higher to 3.0 eV or lower in an excited singlet state S.sub.1 level. The assist dopant part may have an energy of 2.4 eV or higher to 3.0 eV or lower in the excited singlet state S.sub.1 level. An energy gap ΔE.sub.ST between the excited singlet state S.sub.1 and an excited triplet state T.sub.1 may be 0 eV or larger to 2.0 eV or smaller.

Provided are a substrate for an organic electronic device (OED) and a use thereof. Provided is a substrate for a device having excellent durability by preventing interlayer delamination occurring due to internal stress in a structure in which an organic material and an inorganic material are mixed. In addition, provided is an OED having another required physical property such as excellent light extraction efficiency using the substrate, as well as the excellent durability.

A light emitting element ink comprises a light emitting element solvent, a light emitting element dispersed in the light emitting element solvent, the light emitting element including a plurality of semiconductor layers, and an insulating film surrounding outer surfaces of the plurality of semiconductor layers, and a thickener dispersed in the light emitting element solvent, wherein the thickener includes a compound represented by Chemical Structural Formula 1 as a polyol-based compound capable of forming a hydrogen bond with the light emitting element solvent or another thickener, and the thickener has a boiling point in a range of about 200° C. to about 450° C.

A top emission organic EL device includes an anode, hole transporting zone, emitting layer, electron transporting zone, and cathode in this order. The hole transporting zone includes: a first layer interposed between the anode and the emitting layer; and a second layer interposed between the first layer and the emitting layer. The first layer contains a first compound and the second layer contains a second compound. A film thickness of the first layer and the second layer satisfies a formula (1) and (2), respectively. A hole mobility μ.sup.H1 of the first compound satisfies a formula (3) and a hole mobility μ.sup.H2 of the second compound satisfies a formula (4),
100 nm≤d1≤300 nm  (1)
1 nm≤d2≤20 nm  (2)
1.0×10.sup.−4 [cm.sup.2/Vs]≤μ.sup.H1≤1.0×10.sup.−1 [cm.sup.2/Vs]  (3)
1.0×10.sup.−10 [cm.sup.2/Vs]≤μ.sup.H2≤1.0×10.sup.−6 [cm.sup.2/Vs]  (4).

A polarization unit includes a plurality of retardation layers that each have a different retardation value, a polarization layer positioned above the plurality of retardation layers, a first compensation layer positioned between the polarization layer and the plurality of retardation layers, and a second compensation layer positioned below the plurality of retardation layers.

An organic light emitting diode display is disclosed. The organic light emitting diode display includes: a substrate, an organic light emitting diode positioned on the substrate, a metal layer positioned on the substrate with the organic light emitting diode interposed therebetween, and a resin layer positioned on the metal layer and configured to reinforce a strength of the metal layer.

The first electrode has a convexo-concave structure including a plurality of convex portions and a plurality of concave portions at an interface with the organic compound layer. The convexo-concave structure has at least one cross section in a thickness direction of the light-transmissive substrate, the cross section being shaped in a sine-wave curve or a curve represented by a sum of a plurality of sine waves having different amplitudes or angles. A distance between a convex portion and an adjacent convex portion forming the convexo-concave structure is equal to or more than a peak wavelength of light radiated from the emitting layer and is equal to or less than a propagation distance (L.sub.sp) of surface plasmon at the interface between the first electrode having the convexo-concave structure and the organic compound layer.

Provided is an organic electroluminescence element improved in emission efficiency. The organic electroluminescence element includes: a reflective electrode; a light exiting side electrode; an emission layer provided between the reflective electrode and the light exiting side electrode; and at least one low-refractive index layer provided between the reflective electrode and the emission layer, the low-refractive index layer having a refractive index lower than the refractive index of the emission layer. An optical path L.sub.1 between the maximum emission surface of the emission layer and the reflection surface of the reflective electrode, and an optical path L.sub.2 between the reflection interface on an emission layer side of the low-refractive index layer and the maximum emission surface of the emission layer satisfy specific expressions.

A light emitting device including a first electrode and a second electrode, and an emission layer disposed between the first electrode and the second electrode and including quantum dots, a first charge auxiliary layer disposed between the emission layer and the first electrode, and a second charge auxiliary layer disposed between the emission layer and the second electrode, wherein the emission layer comprises a first emission layer contacting the first charge auxiliary layer, a second emission layer disposed on the first emission layer, and a third emission layer disposed on the second emission layer. The hole mobility of the first emission layer decreases sequentially from the first emission layer to the third emission layer.