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 light-emitting device includes a hole blocking layer including one or more of compounds shown in following formula (1)a and formula (1)b. Z1 to Z11 are selected from H or R. R, R1 and R2 are each selected independently from deuterium, halogen, cyano, nitryl, amino, C1-C40 alkyl, C2-C40 alkenyl, C2-C40 alkynyl, C3-C40 cycloalkyl, C3-C40 heterocycloalkyl, C6-C60 aryl, C5-C60 heteroaryl, C1-C40 alkoxy, C6-C60 aryloxy, C3-C40 alkylsilyl, C6-C60 arylsilyl, C1-C40 alkylboron, C6-C60 arylboron, C6-C60 arylphosphinylene, C6-C60 monoaryl or diaryl phosphino and C6-C60 arylamino. R3 is selected from heterocyclyl and fused heterocyclyl.

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 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 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 hererocyclyl 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, R5 and R6 independently are C5-C30 aromatic or heteroaromatic group ring.

Abstract: Disclosed is a CuO/Se composite film, in which Se with low melting point (221° C.) and strong photosensitivity is introduced into CuO, providing the film with fewer defects and excellent optical, electrical and photoelectric properties. In the preparation method of the invention, Se is introduced into CuO and melted by low-temperature annealing, and then the molten Se can infiltrate CuO to eliminate or reduce defects in the CuO film such as voids and dangling bonds, thereby improving optical, electrical and photoelectric properties of the film and overcoming the shortcomings that CuO has poor crystallinity, high melting point and is decomposed at a high temperature.

Abstract: Disclosed is a CuO/Se composite film, in which Se with low melting point (221° C.) and strong photosensitivity is introduced into CuO, providing the film with fewer defects and excellent optical, electrical and photoelectric properties. In the preparation method of the invention, Se is introduced into CuO and melted by low-temperature annealing, and then the molten Se can infiltrate CuO to eliminate or reduce defects in the CuO film such as voids and dangling bonds, thereby improving optical, electrical and photoelectric properties of the film and overcoming the shortcomings that CuO has poor crystallinity, high melting point and is decomposed at a high temperature.