Abstract: The present disclosure provides a light emitting device and a display panel, and belongs to the field of display technology. The light emitting device includes a first electrode, a second electrode and a light emitting functional layer arranged between the first electrode and the second electrode; the light emitting functional layer at least includes an electron transport layer and a hole blocking layer; the electron transport layer has a refractive index between 1.6 and 1.9, and an optical thickness in a range from 540 ? to 700 ?; and a difference between the refractive index of the electron transport layer and a refractive index of the hole blocking layer is less than or equal to 0.1.

Abstract: An organic light emitting device includes an anode, a cathode, and a first hole transport layer and a first light emitting layer arranged between the anode and the cathode, wherein the first hole transport layer is located between the first light emitting layer and the anode; the first hole transport layer at least includes a first hole sublayer and a second hole sublayer; a material of the first hole sublayer includes a first material and a second material, and a material of the second hole sublayer includes at least one of the first material and the second material.

Abstract: A functional layer material includes a compound centered on an sp3 hybridized carbon atom which includes a first type of compound. The first type of compound is selected from any of structures represented by a general formula (I), wherein at least one of a, b, m and n is not 0; A1 and A2 are independently selected from any of a substituted or unsubstituted trivalent aryl group, fused ring trivalent aryl group and fused ring trivalent heteroaryl group; B1 and B2 are independently selected from any of a substituted or unsubstituted alkylene group, arylene group and heteroarylene group; L1 to L4 are independently selected from any of a single bond, a substituted or unsubstituted phenylene group and biphenylene group; and Ar1 to Ar8 are independently selected from any one of a substituted or unsubstituted alkyl group, aryl group, heteroaryl group, fused ring aryl group and fused ring heteroaryl group.

Abstract: The present application provides a dioxin derivative, a preparation method thereof, an electron transport layer, an OLED device and a display panel. The dioxin derivative has a formula of where X is O, S or NR; L represents a direct bond, or L is a substituted or unsubstituted C6-C60 arylene, or L is a C2-C60 heteroaryl including a first heteroatom; A has a formula of Ar1 and Ar2 independently are substituted or unsubstituted aryl, phenyl, biphenyl, or heterocyclyl comprising a second heteroatom, B is O, S or Se, X1, X2 and X3 independently are C or N, and at least one of X1, X2 or X3 is N, R4 and R5 independently are C5-C30 aromatic or heteroaromatic group ring.

Abstract: A display substrate and a display device are provided. The display substrate includes: a base substrate; and a light-emitting element arranged on the base substrate, and including a first electrode, an organic functional layer and a second electrode arranged sequentially in that order in a direction away from the base substrate. The light-emitting element includes a first surface proximate to the base substrate, a second surface distal to the base substrate, and a side surface arranged between the first surface and the second surface. The display substrate further includes a reflection layer covering at least a part of the side surface and configured to reflect light from the organic functional layer.

Abstract: A marine-origin fungus is effective in degrading plastic waste. The marine fungus is of fungal strain Alternaria alternata FB1. The fungal strain can colonize and grow on polyethylene terephthalate and polyethylene plastics and shows good degradability in polyethylene terephthalate, polyethylene, polyester polyurethane, polyether polyurethane, polypropylene, polystyrene, and several common biodegradable plastics.

Abstract: A light emitting device and a displaying device. The light emitting device includes a luminescent layer, wherein the luminescent layer includes a thermally activated delayed-fluorescence material; the thermally activated delayed-fluorescence material includes a donor group, a receptor group and a linking group; the donor group and the receptor group bond to the linking group; and a torsion angle between a plane where the donor group is located and a plane where the linking group is located is ?1, and a torsion angle between a plane where the receptor group is located and the plane where the linking group is located is ?2; wherein ?1 and ?2 enable an energy-level difference between a singlet-state energy level of the thermally activated delayed-fluorescence material and a triplet-state energy level of the thermally activated delayed-fluorescence material to be less than a constant quantity T, wherein 0 eV<T<0.3 eV.

Abstract: The present disclosure provides an organic light-emitting diode structure and a display device. In the organic light-emitting diode structure, the light-emitting layer, the hole blocking layer and the electron blocking layer satisfy the following conditions: T1 (HBL)>T1 (Host); T1 (EBL)>T1 (Host); T1 (Dopant)>T1 (Host); S1 (Host)>S1 (Dopant); wherein T1 (HBL) is the lowest triplet energy of the hole blocking layer material, T1 (Host) is the lowest triplet energy of the host material, T1 (EBL) is the lowest triplet energy of the electron blocking layer material, T1 (Dopant) is the lowest triplet energy of the guest material, S1 (Host) is the lowest singlet energy of the host material, and S1 (Dopant) is the lowest singlet energy of the guest material.

Abstract: A display substrate and a display device are provided. The display substrate includes: a base substrate; and a light-emitting element arranged on the base substrate, and including a first electrode, an organic functional layer and a second electrode arranged sequentially in that order in a direction away from the base substrate. The light-emitting element includes a first surface proximate to the base substrate, a second surface distal to the base substrate, and a side surface arranged between the first surface and the second surface. The display substrate further includes a reflection layer covering at least a part of the side surface and configured to reflect light from the organic functional layer.

Abstract: Embodiments of the present invention provide an OLED device and a manufacturing method. The OLED device comprises: an anode; a hole transport layer; a light-emitting layer; an electron transport layer comprising a first electron transport body and a second electron transport body, wherein the first electron transport body has a spiral structure, the second electron transport body has a continuous ? conjugated system formed by fusing a dioxin structure and a benzoheterocyclic structure, the electron mobility of the first electron transport body is less than the electron mobility of the second electron transport body, the electron mobility of the second electron transport body is 10?5-10?8 cm2V?1s?1@5000 V1/2/m1/2, the triplet-state energy level of the first electron transport body is greater than the triplet-state energy level of the second electron transport body, and the triplet-state energy level of the first electron transport body is greater than 2.4 eV; and a cathode.

Abstract: A light-emitting device that emits green light includes a first electrode and a second electrode that are arranged in sequence, and a light-emitting layer disposed between the first electrode and the second electrode, the light-emitting layer includes a first host material and a second host material; the first host material and the second host material form an exciplex, a difference between a lowest unoccupied molecular orbital (LUMO) energy level of the first host material and a LUMO energy level of the second host material is greater than or equal to 0.5 eV, under a same test condition, a difference between an order of magnitude of a hole mobility of the first host material and an order of magnitude of an electron mobility of the second host material is greater than or equal to 1.

Abstract: A light-emitting device, comprising: a first electrode and a second electrode arranged in a stacked manner; and multiple functional layers provided between the first electrode and the second electrode. The multiple functional layers comprise a light-emitting layer, at least two material layers having a hole transport function between the light-emitting layer and the first electrode, and at least one material layer having an electron transport function between the light-emitting layer and the second electrode. The at least two material layers having the hole transport function comprise an electron blocking layer, and the material of the light-emitting layer comprises a guest material. The difference between the LUMO energy level of the material of the electron blocking layer and the LUMO energy level of a host material is greater than or equal to a threshold.

Abstract: An organic light-emitting device includes: an anode, an emitting layer, and a cathode that are stacked; a first functional material layer located between the emitting layer and the anode; and a second functional material layer located between the emitting layer and the cathode. Under a same test condition, a hole mobility of a material of the first functional material layer is at least ten times an electron mobility of a material of the second functional material layer.

Abstract: The present disclosure provides an organic light emitting device, including a first electrode, a second electrode and an emitting layer disposed between the first electrode and the second electrode. A hole transporting layer is disposed between the first electrode and the emitting layer. An electron transporting layer is disposed between the second electrode and the emitting layer. The ratio of the hole mobility of the hole transporting layer to the electron mobility of the electron transporting layer is about 10 to 500.

Abstract: A light-emitting device includes a first electrode, a second electrode and a light-emitting layer arranged between the first electrode and the second electrode. The light-emitting layer includes a thermally activated delayed fluorescence (TADF) material, and the TADF material includes a donor, an acceptor, and a linking group connected between the donor and the acceptor. The donor includes a donor base unit, and a substituent connected to the donor base unit, and atoms in the donor base unit are located in a first plane. The acceptor includes an acceptor base unit, and a substituent connected to the acceptor base unit, and atoms in the acceptor base unit are located in a second plane. The linking group includes a linking base unit, and a substituent connected to the linking base unit, and atoms in the linking base unit are located in a third plane.

Abstract: The present invention provides an organic electroluminescent device, a display panel, and a display apparatus. A light-emitting layer comprises a first compound, a second compound, a third compound, and a fourth compound; the first compound and the second compound form a first exciplex under optical excitation and electric excitation; excitonic energy compounded by the first exciplex can be transferred to the third compound; then the third compound and the second compound are compounded to form a second exciplex; and excitonic energy compounded by the second exciplex can be transferred to the fourth compound.

Abstract: Disclosed is a security alarm system for newborns. The security alarm system comprises bracelets, positioning labels, limiting labels and a computer, wherein the bracelets comprise newborn bracelets and mother bracelets corresponding to the newborn bracelets, and the newborn bracelets and the mother bracelets corresponding to the newborn bracelets are matched and connected through unique identification codes; and the positioning labels are arranged in a corridor of a ward area, provide positioning information for the newborn bracelets, and provide communication connection between the newborn bracelets and the computer. In the mode, mother and infant identification can be realized through matching modules; when a newborn goes out, the newborn is positioned and the position is inquired in real time through positioning modules and the positioning labels, an alarm is given when the newborn goes out without authorization through the limiting labels, and images are transmitted in real time through camera modules.

Abstract: A display substrate includes a backplane, a pixel defining layer, a gas absorption layer, and light-emitting layers. The pixel defining layer is disposed on a side of the backplane, and has a plurality of openings. The gas absorption layer is disposed on a side of the pixel defining layer away from the backplane, and is configured to absorb a gas generated by the pixel definition layer due to an action of ultraviolet rays. The gas absorption layer exposes at least part of regions of the plurality of openings. The light-emitting layers are each at least partially located in an opening in the plurality of openings.

Abstract: The present disclosure provides a blue organic electroluminescence device, a display panel, and a display apparatus. A blue organic electroluminescence device includes a light-emitting layer having a matrix material and a blue fluorescent doping material doped in the matrix material, where dipole moments of the matrix material and the blue fluorescent doping material are both 0 to 1 D, which can ensure higher energy transfer efficiency and charge balance, ensure that an emission spectrum is a narrow spectrum, and thus have better color purity and higher external quantum Efficiency (EQE) to obtain the blue organic electroluminescence devices with high color purity and high luminous efficiency.

Abstract: Provided are an organic light emitting device and a display apparatus. An organic light emitting device, including an anode, a cathode, and an emitting layer disposed between the anode and the cathode; wherein a hole transport layer and an electron blocking layer are disposed between the anode and the emitting layer; the hole transport layer and the electron blocking layer satisfy: |HOMOHTL?HOMOEBL|?0.2 eV wherein HOMOHTL is a highest occupied molecular orbital, HOMO energy level of the hole transport layer and HOMOEBL is a HOMO energy level of the electron blocking layer.