A light-emitting element with high emission efficiency. The light-emitting element includes a first organic compound, a second organic compound, and a guest material. The LUMO level of the first organic compound is lower than the LUMO level of the second organic compound. The HOMO level of the first organic compound is lower than the HOMO level of the second organic compound. The HOMO level of the guest material is higher than the HOMO level of the second organic compound. The energy difference between the LUMO level of the guest material and the HOMO level of the guest material is larger than the energy difference between the LUMO level of the first organic compound and the HOMO level of the second organic compound. The guest material has a function of converting triplet excitation energy into light emission. The first organic compound and the second organic compound form an exciplex.

Methods for forming an OLED device are described. An encapsulation structure having organic buffer layer and an interface layer disposed on the organic buffer layer sandwiched between barrier layers is deposited over an OLED structure. In one example, an OLED device includes a first barrier layer disposed on a region of a substrate having an OLED structure disposed thereon, a fluorinated buffer layer including a polymer material containing fluorine disposed on the first barrier layer, an interface layer including the polymer material on the fluorinated buffer layer, and a second barrier layer disposed on the interface layer.

A light-emitting electrochemical cell (1, 1, 1, 1) comprises a substrate (10), a first electrode (11), an emission layer (13), contacting the first electrode (11) and providing a first 2D pattern, which is made up by the emission layer being visually distinguishable, and a second electrode (14). The emission layer (13) provides a second 2D pattern, which is made up by first portions (131a, 131b; 132a, 132b) which are passive with respect to photoluminescence and second portions (133) of the emission layer which are active with respect to photoluminescence, and a third 2D pattern is provided by regions, which are active with respect to electroluminescence, where the first and second electrodes (11, 14) overlap and electrically contact the second portions (133) of the emission layer (13). There is also disclosed a security element, a security system and methods of operating and manufacturing the light-emitting electrochemical cell (1, 1, 1, 1).

A light-emitting element includes a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode, in which the light-emitting layer includes a first nanoparticle group including a first nanoparticle and spreading in a layer shape, a first quantum dots located between the first electrode and the first nanoparticle group and a second quantum dots located between the second electrode and the first nanoparticle group.

The present disclosure relates to an organic light emitting device, a display device, a preparation method, a storage medium and a computer equipment. The organic light emitting device includes an anode, an organic layer and a cathode, in which the organic layer includes a hole injection layer, a hole transport layer, an electron blocking layer, an organic light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, which are sequentially arranged in a stack on the anode, in which the hole injection layer includes a first host material and a first doping material doped in the first host material, a doping concentration of the first doping material gradually decreases in a direction away from the anode, and a doping ratio of the first doping material in the hole injection layer is less than or equal to 6%.

The invention relates to a 3D/2D hybrid perovskite solar cell and its preparation method, which belongs to the field of preparation technology of perovskite material. By using aromatic organic spacer that can enhance the conjugation effect, a 3D/2D multi-dimensional perovskite is obtained, and its conjugation effect is enhanced, thereby improving its charge transport capability, which makes that the 3D/2D perovskite solar cell has both the high light absorption rate and charge transport capability of 3D perovskite material and the excellent stability of 2D perovskite material, so as to achieve efficient and stable 3D/2D multi-dimensional perovskite material and device.

A display apparatus having high external light transmittance and a manufacturing method of the display apparatus are provided, wherein the display apparatus does not substantially include a common electrode in a transmission region. Particularly, a display apparatus includes a first substrate, a second substrate facing the first substrate, and a display unit interposed between the first substrate and the second substrate.

Provided are a display panel and a manufacturing method therefor, and a display apparatus. The display panel includes a plurality of sub-pixels of at least two colors and further comprises: a base substrate; a first electrode on the base substrate; an electron transport layer at the side of the first electrode facing away from the base substrate; a quantum dot light-emitting layer at the side of the electron transport layer facing away from the base substrate; and a second electrode at the side of the quantum dot light-emitting layer facing away from the base substrate. Materials of the quantum dot light-emitting layer of the sub-pixels of different colors are different. The electron transport layer is of an alloy heterostructure at least composed of a metal oxide and a metal chalcogenide. Contents of the metal chalcogenide in the alloy heterostructure at positions of the sub-pixels of different colors are different.

The present disclosure relates to a method for preparing an organic light emitting device, a preparation system, a storage medium and a computer equipment. The method includes: forming a hole injection layer, a hole transport layer, an electron blocking layer, an organic light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, which are sequentially arranged in a stack on an anode of the organic light emitting device, wherein the hole injection layer comprises a first host material and a first doping material doped in the first host material, a doping concentration of the first doping material gradually decreases in a direction away from the anode, and a doping ratio of the first doping material in the hole injection layer is less than or equal to 6%.

A display apparatus includes a first through a third light-emitting devices, each including a first-color emission layer and being over a substrate; a second-color quantum dot layer over the second light-emitting device; a third-color quantum dot layer over the third light-emitting device; and a low refractive index layer over the second-color quantum dot layer and the third-color quantum dot layer to correspond to the first through third light-emitting devices, and including a matrix part and a plurality of particles in the matrix part, wherein a first portion of the matrix part close to the first through third light-emitting devices includes fluorine.