Abstract: An organic electroluminescent device and a display device are provided. The organic electroluminescent device comprises a substrate, an anode, an organic light-emitting layer and a cathode disposed in sequence, wherein the organic light-emitting layer comprises a host material, a guest light-emitting material and an exciton utilizing agent, and the host material comprises a hole-type host material and an electron-type host material, and the minimum values of bond dissociation energies of the electron-type host material and the exciton utilizing agent in an anionic state, an electrically neutral state and a cationic state are each independently ?2.6 eV, and the HOMO energy level of the guest light-emitting material is H1, the HOMO energy level of the exciton utilizing agent is H2, and H1 and H2 satisfy the relationship: 0 eV?H2?H1?0.5 eV. The present application can improve luminous efficiency and lifetime of OLED device.

Abstract: The embodiments of the present application relate to the technical field of electronic devices. Disclosed are a method and apparatus for switching an operating system, and an electronic device and a storage medium. The method is applied to an electronic device, which electronic device can run a first operating system and a second operating system. The method comprises: when a display apparatus of an electronic device is in a screen-off state for a first duration, switching the electronic device from a first operating system to a second operating system; and if the display apparatus is switched from the screen-off state to a screen-on state, continuing to run the second operating system. By means of implementing the embodiments of the present application, an operating system can be automatically switched when a display apparatus is in a screen-off state, thereby improving the degree of intelligence of a device.

Abstract: A screen display method and an electronic device are provided. The screen display method is performed by an electronic device capable of running a first system and a second system. The electronic device at least includes a display screen, and the method includes: during the operation of the first system, controlling, by the first system, the display screen to enter an always on display (AOD) mode, in a case where a first AOD condition is met in the electronic device; and transmitting, by the first system, an AOD switching instruction to the second system, in a case where a second AOD condition is met in the electronic device. The AOD switching instruction is configured to indicate the second system to control the display screen to enter the AOD mode.

Abstract: Disclosed is an adiabatic optical coupler. The adiabatic optical coupler includes a tapered input region which includes a first waveguide core and a second waveguide core. The first and second waveguide cores are separated at the tapered input region. The adiabatic optical coupler also includes a narrow coupling region extending from the tapered input region. In the narrow coupling region, the first and second waveguide cores are brought within close proximity and a third waveguide core is positioned between the first and second waveguide cores. The third waveguide core defines a longitudinal axis. The adiabatic optical coupler also includes a flared output region extending from the narrow coupling region. In the flared output region, the first, second, and third waveguide cores are separated.

Abstract: A shell, a battery cell, a battery, and an electric device. At least partial area of a shell 211 has a tensile strength Rm at a temperature of 25° C. At least part of the shell 211 comprises first shell walls 2112, the average thickness of the first shell walls 2112 is T, Rm and T satisfy the following: 250 MPa?Rm?2000 MPa, 0.05 mm?T?0.5 mm, and 60 mm·MPa?T×Rm?500 mm·MPa.

Abstract: A spherical carrier for olefin polymerization catalysts has at least one magnesium-containing compound having a structure represented by formula (1). The spherical carrier has a relatively good particle morphology, and substantially no abnormally morphological particles will appear. A method for preparing the spherical carrier can be used to prepare a carrier having a small particle size and greatly expands the particle size range of the preparable carrier. When the catalyst prepared by using the carrier is used for olefin polymerization, polymerization activity is good, substantially no abnormally morphological material is present, and hydrogen response is good.

Abstract: A tunable laser comprising at least two gain chips configured to generate light and a wavelength selection circuit. The wavelength selection circuit comprising a first waveguide coupled to a first gain chip of the at least two gain chips, a second waveguide coupled to a second gain chip of the at least two gain chips, a first wavelength selective photonic ring resonator optically coupled to the first waveguide, a second wavelength selective photonic ring resonator optically coupled to second waveguide, a third waveguide optically coupled to the first wavelength selective photonic ring resonator and the second wavelength selective photonic ring resonator; and a control circuit. The control circuit is configured to apply a first current to the first gain chip to bias the first gain chip, tune the first wavelength selective photonic ring resonator to a target wavelength, and tune the second wavelength selective ring resonator off-resonance.

Abstract: In one embodiment, the disclosure relates to an electro-optical device that includes an optical gain chip that includes; a gain material, the gain material having a gain region, the optical gain chip that includes: N gain chip waveguides; a photonic integrated circuit (PIC) that includes a plurality of layers and a plurality of components, wherein the PIC defines M sections; N external laser cavities; P PIC waveguides; and B distributed Bragg reflector (DBR) rings, wherein each of the N external laser cavities is defined by one of the P PIC waveguides and one of the B DBR rings; and N laser cavities, wherein each laser cavity of the N laser cavities comprises one of the N external laser cavities and one of the N gain chip waveguides.

Abstract: In part, in one embodiment the disclosure relates to a laser that includes a laser cavity; an optical gain chip that includes a gain material, the gain material having a gain region, the optical gain chip includes a first waveguide, the first waveguide defines a first section of the laser cavity; an external laser cavity includes a second waveguide, the second waveguide is optically coupled to the first waveguide, the second waveguide defines a second section of the laser cavity; and a DBR ring optically coupled to the second waveguide, the DBR ring includes a loop waveguide optically coupled to the second waveguide and one or more DBR disposed along one or more sections of the loop waveguide, the laser cavity includes the first section of the laser cavity and the external laser cavity; and a PIC that includes the second waveguide and the DBR ring.

Abstract: An advanced optical device featuring a substrate with a receiver photonic integrated circuit (PIC) and a transimpedance amplifier (TIA) is disclosed. The PIC is mechanically coupled to the substrate, while the TIA is mounted to the substrate and electrically connected to the PIC. One configuration includes a receiver die flip-chip bonded to a TIA die using copper pillar bumps, optimizing space with the PIC having a smaller footprint than the TIA. A fiber array is precisely aligned and attached to the PIC using epoxy bonding, aided by alignment marks indicating spot-size converters (SSCs). The PIC incudes multiple photodetectors and waveguides, enhancing light guidance and conversion. The manufacturing process involves a chip-on-wafer technique, forming a dam for epoxy application, and precise alignment of fiducials to the fiber array.

Abstract: A device and a method of fabricating the device are provided. The device includes an optical modulator formed in a dielectric material, a silicon substrate adjacent the dielectric material, and a metal shield formed in the dielectric material between the optical modulator and the silicon substrate. The metal shield blocks an electromagnetic field of a driving signal of the optical modulator from extending into the silicon substrate.

Abstract: A solid catalyst component for olefin polymerization includes magnesium, titanium, a halogen, a poly(?-olefin), and an internal electron donor. A Ti2p spectrum obtained from XPS analysis of the solid catalyst component is subjected to peak separation by means of Gaussian-Lorentzian peak-separation fitting. The result of the peak separation shows that the spectrum peaks of the Ti2p3/2 orbit have at least three characteristic peaks at positions where an electron binding energy is 459.9-454.9 eV. The solid catalyst component, when used in olefin polymerization, has the characteristics of slow decay of activity with the increase of storage time and a low fine powder content of the resulting polymer.

Abstract: A catalyst component for olefin polymerization, a preparation method therefor and a use thereof are provided. The catalyst component contains elemental magnesium, elemental titanium and an internal electron donor. The internal electron donor has a phosphate ester, and an ?-cyanosuccinate and/or a substituted ?-cyanosuccinate. A molar ratio of the phosphate ester to the elemental magnesium is 0.0002-0.002:1. When the catalyst is used for olefin polymerization, especially for propylene polymerization, the obtained polymer has the characteristics of a high Z+1 average molecular weight and a good balance of rigidity and toughness.

Abstract: The present disclosure provides a system and a method for image compression. The method includes obtaining an image frame and dividing it into a set of image blocks. A preliminary quantization profile is then obtained. Each image block undergoes a Discrete Cosine Transform (DCT) to create a frequency-dependent image profile, which is subsequently quantized using the preliminary quantization profile and compressed using at least one compression encoding algorithm. The size of the compressed image frame is compared with a target size range, and the preliminary quantization profile is updated based on the comparison result. Additionally, the method includes dynamically adjusting the target size range based on environmental or network conditions of the system, thereby enhancing real-time adaptability and efficiency in handling dynamic environment and complex scenes.

Abstract: A battery cell, a battery, and an electric device. The battery cell comprises: an electrode assembly comprising a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet form a flat region; and a housing comprising a first wall portion and two second wall portions, the two second wall portions being respectively located on two sides of the flat region in a first direction. The first wall portion comprises a shell body and a pressure relief portion, wherein the shell body is arranged around the periphery of the pressure relief portion, a notch groove is formed in the pressure relief portion and has a first groove wall section obliquely extending in the first direction on a bottom wall thereof, and the first groove wall section is at an angle to the first direction.

Abstract: The present application discloses a battery cell, a battery, and an electrical apparatus, wherein the battery cell includes an electrode assembly, a shell, and an electrode terminal; the electrode assembly is at least partially accommodated in the shell; the electrode terminal is electrically connected to the electrode assembly; the electrode terminal is arranged on a wall portion of the shell, the electrode terminal includes a first metal layer and a second metal layer that are made of different materials; in the thickness direction of the wall portion, the first metal layer is located on one side of the second metal layer facing the electrode assembly; the first metal layer and the second metal layer are connected to form a connecting interface, and at least a part of the connecting interface is a curved surface.

Abstract: In one embodiment, the disclosure relates to a multi-use electro-optical device. The device may include a first group of optical inputs that include one or more optical inputs that are user selectable for a first operating mode. The device may also include a second group of optical inputs that include four or more optical inputs, wherein the four or more optical inputs are user selectable for a second operating mode. The device may include a first optical output operable to support the second operating mode. The first optical output is in optical communication with the four or more optical inputs. The device may also include a second group of optical outputs that includes four or more optical outputs, wherein the four or more optical outputs are user selectable for a first operating mode. The device also may include a modulator stage that includes four or more modulators.

Abstract: In part, in one aspect, the disclosure relates to a photodiode. The photodiode may include a substrate; a semiconductor layer comprising an semiconductor material, the semiconductor layer disposed on the substrate and in communication with at least a region of the substrate, the semiconductor layer having a first side, a second side, and an upper surface, the semiconductor layer having a height; a semiconductor structure partially disposed on the upper surface, the semiconductor structure comprising at least one elongate portion that extends beyond the first side and along a portion of the upper surface of the semiconductor layer; and a metal contact that is in electrical connection with the elongate portion of the semiconductor structure.

Abstract: The present application relates to a light-emitting device, a display panel and a display device. The light-emitting device comprises an anode, a cathode, and a first light-emitting unit and a second light-emitting unit which are located between the anode and the cathode, and at least one charge generation layer located between the first light-emitting unit and the second light-emitting unit, the charge generation layer comprising an N-type charge generation sub-layer and a P-type charge generation sub-layer located on a side of the N-type charge generation sub-layer close to the cathode, wherein the P-type charge generation sub-layer comprises a hole transport material, and a first hole injection material and a second hole injection material which are doped into the hole transport material, an absolute value of a lowest unoccupied molecular orbital energy level of the second hole injection material being less than that of the first hole injection material.