The present invention provides with an electron-accepting compound having a structure of the following formula (1):

##STR00001##

A display device comprising: pixel electrodes; an electroluminescent layer composed of layers laminated with each other, the multiple layers including a light-emitting layer and a charge generation layer; and a counter electrode. The multiple layers include a first layer composed of sections separated from each other and overlapping with the pixel electrodes, a second layer in contact with the first layer and continuous over the pixel electrodes, and a third layer interposed between the first layer and the second layer, the third layer being in contact with the first layer and the second layer over an adjacent pair of the sections. At least the charge generation layer is the first layer. The second layer is adapted to inject or transport carriers, either electrons or holes. The third layer is adapted to block the carriers injected or transported by the second layer.

The present application discloses a method for preparing quantum dots light-emitting diode, including the following step: providing a base plate, placing the base plate into an inert atmosphere containing active gas, and printing quantum dots ink on a surface of the base plate to prepare a quantum dots light-emitting layer. The method for preparing the quantum dots light-emitting diode provided in the present application changes the film-forming atmosphere of inkjet printing, and prepares the quantum dots light-emitting layer in the inert atmosphere containing active gas, which can improve the device efficiency of the quantum dots light-emitting diode while ensuring the printability of quantum dots ink.

Disclosed is an organic electroluminescence device including an anode, a cathode, at least two light-emission sub-stacks and a charge generation layer. The charge generation layer is located between the light-emission sub-stacks, and the charge generation layer includes a stack of a n-type charge generation layer and a p-type charge generation layer. The n-type charge generation layer includes a Compound of Formula 1 and a Compound of Formula 2. The present organic electroluminescence device improves injection and transport properties of electrons to lower driving voltage of the device, improves efficiency and lifespan of the device, and has excellent thermal/electrical stability for long driving duration of the device.

A display panel and a display apparatus. The display panel includes a blue light-emitting device, and the blue light-emitting device includes a first electrode, an electron blocking layer, a light-emitting layer and a second electrode which are stacked. The hole mobility of the electron blocking layer is not greater than 5×10.sup.−4 cm.sup.2/VS, so that electrons and holes in the light-emitting layer tend to be balanced, and luminous efficiency of the blue light-emitting device under the low luminance is improved.

Provided is a light-emitting device including: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the interlayer includes a hole injection layer and an electron transport layer, the hole injection layer includes a first electron transport compound, and a hole mobility (M.sub.H) and electron mobility (M.sub.E) of the first electron transport compound satisfy following Equation (1):

Equation (1)

M.sub.H≤M.sub.E×0.95  (1).

An embodiment of the present invention provides an organic compound represented by: ##STR00001##
and an organic light emitting diode and an organic light emitting display device using the organic compound. The organic compound of the present invention includes a phenanthroline core, which has a nitrogen atom of a relatively electron rich sp.sup.2 hybrid orbital, and a phosphine oxide moiety, which has an excellent electron transporting property and an excellent thermal stability. The electron transporting property of the organic compound of the present invention is improved based on the chemical structure of the organic compound. Accordingly, when the organic compound is used for the organic light emitting diode and the organic light emitting display device, the driving voltage is reduced, and the lifetime and the emitting efficiency are improved.

A display device achieves a high resolution and a low power consumption through provision of subpixels each including a single light emitting layer and subpixels each including a plurality of overlapping light emitting layers. In the display device, it is also unnecessary to increase the number of expensive fine metal masks even for rendering of various grayscales. In addition, in the display device, different light emitting layers overlap with each other, and a charge generation layer is disposed between the overlapping light emitting layers, and, as such, emission of a secondary color can be achieved without necessity of a material for an additional light emitting layer of the secondary color.

An organic electroluminescent device adopts a TADF material as a first host material (6) of a green light unit (302) to sensitize a green phosphorescent material serving as a first guest material (7). A portion of triplet excitons are converted into singlet excitons through inverse gap crossing, and thus decrease of the triplet exciton concentration results in narrowing of the recombination region, thereby preventing the triplet excitons from diffusing into a blue light layer (4) to emit light, so as to realize a green light spectrum containing no blue light component. And because an energy level difference between red light and blue light is relatively large, carriers in a red light unit cannot be easily transferred to the blue light layer, and therefore it is not easy for a blue light component to appear in a red light spectrum. Accordingly, the light-emitting spectrums of red/green subpixels in the organic electroluminescent device with a shared blue light layer do not contain blue light, thereby effectively broaden the range of applicable combinations of luminescent materials and improving the display performance of the device. Moreover, a hole-blocking layer is not required, and thus the structure of the device is effectively simplified, and the operation voltage is lowered; in the meantime, the process difficulty is reduced, and the product yield is increased, thereby reducing the production cost.

A display device includes a substrate, a plurality of pixels above the substrate, each of the pixels including a light emitting element, a display region including the plurality of pixels, a thin film transistor which each of the plurality of pixels includes, a protective film including a first inorganic insulating material and located between the thin film transistor and the light emitting element, a sealing film including a second inorganic insulating material and covering the light emitting element, and at least one through hole located in the display region and passing through the substrate, the protective film, and the sealing film, wherein the second inorganic insulating material is in direct contact with the protective film in a first region located between the through hole and the pixels.