A quantum dot, a quantum dot light emitting diode and a quantum dot display device are discussed. The quantum dot includes a first core including a first semiconductor material, a first shell positioned at an outer side of the first core and including a second semiconductor material, and a second core positioned between the first core and the first shell and including one of the first and second semiconductor materials and a doping metal.

An organic electroluminescence device including at least an anode, an emitting layer, an electron-transporting region and a cathode in sequential order, wherein the emitting layer contains a host and a dopant which gives fluorescent emission of which the main peak wavelength is 550 nm or less; the affinity Ad of the dopant is equal to or larger than the affinity Ah of the host; the triplet energy E.sup.T.sub.d of the dopant is larger than the triplet energy E.sup.T.sub.h of the host; and a blocking layer is provided within the electron-transporting region such that it is adjacent to the emitting layer, and the triplet energy E.sup.T.sub.b of the blocking layer is larger than E.sup.T.sub.h.

A novel organic compound having high stability is provided. The organic compound is represented by Formula (1) described in claim 1: In Formula (1), R.sub.1 and R.sub.2 each independently selected from a hydrogen atom, Substituent group A, and Substituent group B shown in claim 1, wherein at least one of R.sub.1 and R.sub.2 is selected from Substituent group A or Substituent group B; and R.sub.11 and R.sub.12 of a substituent belonging to Substituent group A are each independently selected from Substituent group B.

A method of manufacturing a foldable display device includes providing a first structure including a first flexible member, a first release film having a first release force, and a lower release film having a second release force, detaching the first release film without detaching the lower release film, providing a second structure including a second flexible member, a second release film having a third release force, and a first adhesive layer on the first flexible member, and detaching the lower release film without detaching the second release film, in which an adhesive force of the first adhesive layer to the first or second flexible members is greater than the second and third release force, the second release force is larger than the first release force by about “n” times and the third release force by about “m” times, “n” and “m” each being a real number larger than about one.

An organic EL display panel includes: a first pixel electrode and a red organic light-emitting layer sequentially disposed in red subpixel region; a second pixel electrode and a green organic light-emitting layer sequentially disposed in green subpixel region; a third pixel electrode and a first blue organic light-emitting layer sequentially disposed in blue subpixel region; a charge generation layer disposed above the red, green, and first blue light-emitting layers; a second blue organic light-emitting layer disposed on the charge generation layer in the entire subpixel regions; a counter electrode disposed above the second blue light-emitting layer in the entire subpixels regions; a first light conversion layer disposed above the second blue light-emitting layer in the red subpixel region, and converts blue light to red light; and a second light conversion layer disposed above the second blue light-emitting layer in the green subpixel region, and converts blue light to green light.

An organic EL device according to the present invention includes: a first structure section; and a second structure section. The first structure section includes: a recess; a reflection layer provided along an inner surface of the recess; a filling layer filled at an inner side of the recess via the reflection layer; a first electrode; an organic layer including a light-emitting layer; and a second electrode. The second structure section includes: a reflection layer provided on a flat surface of the base material; a first electrode; an organic layer including a light-emitting layer; and a second electrode.

An organic light-emitting diode (OLED) display panel and an OLED display device are provided. The (OLED) display panel comprises a first substrate; a first electrode layer disposed on the first substrate and including a plurality of first electrodes; a plurality of light-emitting devices disposed on a surface of the first electrode layer far away from the first substrate and having m number of colors, where m is a positive integer, wherein one light-emitting device corresponds to one color, and given a predetermined value of brightness, the light-emitting devices of two different colors are configured to have a predetermined absolute value of a threshold voltage difference; and a second electrode layer disposed on a surface of the plurality of light-emitting devices far away from the first electrode layer.

An organic light-emitting element including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode. The light-emitting layer contains a first organic compound material, a second organic compound that is a delayed fluorescent material, and a third organic compound that is a light-emitting material. In the second organic compound, an electron is transferred from a plurality of occupied molecular orbitals (OMO) to a lowest unoccupied molecular orbital (LUMO) in a second excited triplet state.

The present invention provides an organic light-emitting diode (OLED) display panel, including: an array substrate; an anode disposed on the array substrate; a light-emitting layer disposed on the anode, the light-emitting layer including a red light-emitting sub-layer, a green light-emitting sub-layer, and a blue light-emitting sub-layer in a pixel region; and a cathode disposed on the light-emitting layer, wherein the pixel region at least corresponding to the red light-emitting sub-layer and the green light-emitting sub-layer is not provided with a hole blocking layer.

An organic light-emitting display panel, a manufacturing method thereof, and an organic light-emitting display device are provided. The organic light-emitting display panel includes a substrate, a plurality of anode electrodes, a pixel definition layer, an electron transport layer, and a cathode electrode. The pixel definition layer surrounds to form a plurality of array-distributed grooves, and the anode electrodes are disposed in the grooves one by one. The pixel definition layer includes first retaining walls, second retaining walls, and third retaining walls. At least one compartment is formed among a first organic light-emitting layer, a second organic light-emitting layer, and a third organic light-emitting layer disposed on the anode electrodes.