78 results about "Emission efficiency" patented technology

Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime. This organic EL device includes one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers includes a first host selected from indolocarbazole compounds, a second host selected from the compounds represented by the following general formula (2), and, as a light emitting dopant, a polycyclic aromatic compound represented by the following general formula (3) or a polycyclic aromatic compound represented by the general formula (3) as a substructure, wherein Y4 is B, P, P═O, P═S, Al, Ga, As, Si—R4 or Ge—R5, and X4 is O, N—Ar4, S or Se.

The utility model discloses a kind of cathode heater subassemblies for klystron electron gun, it is characterized in that, including: cathode base, heater sleeve, heater and detachable heat shield assembly, the upper and lower two end surfaces of cathode base are respectively provided with emitting surface and mounting groove, heater sleeve is detachably fixed in mounting groove, and the end surface of heater sleeve back to cathode base is equipped with accommodating groove;Heater is installed in accommodating groove, and the part of heater in accommodating groove is wrapped with insulating layer;Heat shield assembly includes outer heat shield and inner heat shield, outer heat shield is sleeved in cathode base, and inner heat shield is installed in outer heat shield and covers heater sleeve and heater.The utility model can realize reversibility dismounting and maintenance, and heater material volatilization can be avoided directly deposited on the emitting surface of cathode base, help to maintain the emitting surface cleanliness of cathode base, to improve electron emission efficiency, high-temperature solder can also be reduced in use, reduce cost.

Disclosed are light-emitting elements and amine compounds for light-emitting elements. The light-emitting element includes: a first electrode; a second electrode; and at least one functional layer provided between the first electrode and the second electrode and including an amine compound represented by Formula 1. The light-emitting element can exhibit high emission efficiency and improved service life characteristics: Formula 1.

The invention discloses a silicon-based micro-channel plate (MCP) structure and a manufacturing method thereof, relates to the technical field of semiconductor device manufacturing, and aims to solve the problems of poor high temperature resistance, insufficient etching precision, film layer quality defect and process synergy deficiency of a traditional glass-based / organic-based MCP. An 8-inch N-type monocrystalline silicon wafer is adopted in the structure, the thickness of the N-type monocrystalline silicon wafer is (250-350) + / -25 microns, micropores of 3-10 microns are evenly distributed, the hole pitch is 7-22 microns, the inclination angle is 6-12 degrees, the side wall roughness is smaller than or equal to 50 nm, the perpendicularity deviation is smaller than or equal to + / -0.5 degrees, an AlO or AlO / HfO / AlO electron multiplication layer with the thickness of 10-30 nm is prepared on the inner wall of a channel through ALD, and a Cr / Ni electrode with the thickness of 50-80 nm is plated on the surface. According to the method, the OES is used for monitoring SiFs in real time. According to the invention, the double targets of < = 30% of 1kg impact fracture rate and stable electron multiplication gain are achieved, the tolerable temperature reaches 800 DEG C, the secondary electron emission efficiency is improved by 25%, the production efficiency is improved by 20%, the cost is reduced by 15%, and the method is suitable for the high-sensitivity detection fields of night vision imaging, particle detection and the like.

An organic electroluminescent device of an embodiment is provided. The organic electroluminescent device includes a first electrode and a second electrode disposed opposite to each other, and a plurality of organic layers disposed between the first electrode and the second electrode, wherein at least one among the organic layers includes a fused polycyclic compound represented by the following Formula 1, thereby exhibiting improved emission efficiency. [Formula 1] wherein, X, Y, R 11 to R 21 are the same as defined in the specification.

The invention relates to a reverse conducting IGBT device and a preparation method thereof, electronic equipment and a vehicle, and the reverse conducting IGBT device is characterized in that a transition region is arranged between an IGBT region and a diode region of the reverse conducting IGBT device, the front surface structure of the transition region is consistent with the front surface structure of the diode region, and the back surface structure of the transition region is consistent with the back surface structure of the IGBT region. In the working mode of the diode, the anode emission efficiency is reduced, and the effect of reducing the reverse recovery current and the reverse recovery loss of the diode is achieved; in the IGBT working mode, more paths are provided for hole extraction, the turn-off speed of the IGBT is increased, and the turn-off loss of the device is reduced; meanwhile, the performance of the diode region and the IGBT region is improved, and the stability and reliability of the device are improved.

A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 1.

To provide a light-emitting element having high emission efficiency and to provide a light-emitting device and an electronic device that have low power consumption and are driven at low voltage, a carbazole derivative represented by General Formula (1) is provided. In the formula, α 1 , α 2 , α 3 , and α 4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar 1 and Ar 2 each represent an aryl group having less than or equal to 13 carbon atoms; R 1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R 2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n each independently are 0 or 1.

An organic electroluminescence device of an embodiment includes a first electrode, a second electrode facing the first electrode, and a plurality of organic layers between the first electrode and the second electrode, wherein at least one of the plurality of organic layers includes a fused polycyclic compound represented by the following Formula 1, thereby showing improved emission efficiency. Formula 1.

To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the guest material is lower than a LUMO level of the host material. An energy difference between the LUMO level and a HOMO level of the guest material is larger than an energy difference between the LUMO level and a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. An energy difference between the LUMO level of the guest material and the HOMO level of the host material is larger than or equal to energy of light emission of the guest material.

To provide a novel light-emitting element. Another object of one embodiment of the present invention is to provide a light-emitting element with a long lifetime. Another object of one embodiment of the present invention is to provide a light-emitting element with high emission efficiency. Another object of one embodiment of the present invention is to provide a novel organic compound. Another object of one embodiment of the present invention is to provide a novel organic compound having a hole-transport property. Another object of one embodiment of the present invention is to provide a novel hole-transport material.SOLUTION: A hole-transport material including an organic compound having a substituted or unsubstituted benzonaphthofuran skeleton and a substituted or unsubstituted amine skeleton is provided. A light-emitting element using the hole-transport material is provided. Another embodiment of the present invention provides an organic compound in which an amine skeleton including two aromatic hydrocarbon groups each having 6 to 60 carbon atoms is bonded to the 6-position or the 8-position of benzonaphthofuran.SELECTED DRAWING: None

The application belongs to the field of piezoelectric MEMS sensors, and relates to a piezoelectric MEMS ultrasonic sensor ranging circuit and a ranging method, which comprise an MCU, a high-voltage pulse driving circuit, an adaptive impedance matching network, a piezoelectric MEMS ultrasonic transducer, an active damping network, a preamplifier, a band-pass filter and a time gain controller; the high-voltage pulse driving circuit can greatly improve the emission sound pressure of the transducer and improve the measurement range; a controllable switch is designed at one end of the damping resistor, which can improve the emission efficiency and reduce the residual vibration, thereby reducing the measurement blind area; the adaptive impedance matching network is introduced, which can adjust the impedance inconsistent between different devices due to temperature and aging degree to the impedance matched with the ranging circuit, effectively improve the sensitivity and emission efficiency of the device, and the high sensitivity can improve the distance measurement precision of the ranging circuit.

A light-emitting element includes a first electrode, a second electrode, and at least one functional layer disposed between the first electrode and the second electrode and including an amine compound represented by Formula 1. The light-emitting element may exhibit high emission efficiency and improved service life characteristics:

A light emitting element and an amine compound for a light emitting element are disclosed. A light emitting element of one embodiment can include a first electrode, a second electrode arranged over the first electrode, and at least one functional layer arranged between the first electrode and the second electrode. The at least one functional layer can include an amine compound represented by the following Chemical Formula 1. Thus, a light emitting element of one embodiment can exhibit improved emission efficiency and element lifetime.[Chemical Formula 1]

Nanowire heterostructures are disclosed for high-efficiency light emitting devices, lasers, and related applications. The nanowires may include inversely tapered geometries, core regions configured for quantum confinement of carriers, and radial profiles that provide radial carrier confinement, thereby suppressing non-radiative recombination and enhancing emission efficiency. In some embodiments, the nanowires are grown on silicon substrates using molecular beam epitaxy and emit light in the ultraviolet or visible spectrum. The structures may also enable coherent emission through Anderson localization of light with simplified fabrication.

Provided is 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 that of the second organic compound, and the HOMO level of the first organic compound is lower than that of the second organic compound. The LUMO level of a guest material is higher than that of the first organic compound, and the HOMO level of the guest material is lower than that 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.

To provide a quantum dot having excellent stability and giving high emission efficiency when used as a luminescent material of an electroluminescent element, and to provide an electroluminescent element and an ink composition containing the quantum dot.SOLUTION: The quantum dot contains a semiconductor particle surface-treated with a surface treatment agent, wherein the surface treatment agent contains a compound represented by general formula (1) or the like.SELECTED DRAWING: None

Disclosed are a light-emitting element and an amine compound for a light-emitting element. A light-emitting element of one embodiment includes a first electrode; a second electrode; and at least one functional layer arranged between the first electrode and the second electrode, in which excellent emission efficiency and improved lifetime characteristics can be exhibited by including an amine compound represented by the following Chemical Formula 1 in the functional layer.[Chemical Formula 1]

A novel compound is provided. In addition, a light-emitting element with high emission efficiency and a long lifetime is provided. An organic compound represented by General Formula (G0), including a dibenzocarbazole skeleton and two amine skeletons. In General Formula (G0), A represents a substituted or unsubstituted dibenzocarbazole skeleton. The dibenzocarbazole skeleton and the amine skeletons may be bonded to each other through or not through an arylene group. In addition, a light-emitting element including the compound is provided.

A phosphor wheel comprising: a substrate having a recess, a phosphor layer disposed in the recess, and a first reflection layer surrounding the substrate. Thus, heat emission efficiency is increased, and it is possible to prevent defects such as cracking or discolouration of the phosphor layer.

Provided are a display device driving method and a display device, the method comprising the steps of: providing a display device, the display device comprising a first light emitting element, a second light emitting element, and a light path control layer; generating a first curve by calculating a first emission efficiency according to a brightness specific time of the first light emitting element; generating a second curve by calculating a second emission efficiency according to a brightness specific time of the second light emitting element; calculating emissivity based on the first curve and the second curve; and calculating a first gamma value and a second gamma value applied to the first light emitting element and the second light emitting element, respectively, based on the emissivity.

A multicolor light-emitting element using fluorescence and phosphorescence, which has a small number of manufacturing steps owing to a relatively small number of layers to be formed and is advantageous for practical application can be provided. In addition, a multicolor light-emitting element using fluorescence and phosphorescence, which has favorable emission efficiency is provided. A light-emitting element which includes a light-emitting layer having a stacked-layer structure of a first light-emitting layer exhibiting light emission from a first exciplex and a second light-emitting layer exhibiting phosphorescence is provided.

Objects of the present invention are to provide: a light-emitting element having a long lifetime and good emission efficiency and drive voltage. One embodiment of the invention is a light-emitting element including, between an anode and a cathode, at least a stack structure in which a first layer, a second layer, and a light-emitting layer are provided in order from the anode side. The first layer includes a first organic compound and an electron-accepting compound. The second layer includes a second organic compound having a HOMO level differing from the HOMO level of the first organic compound by from −0.2 eV to +0.2 eV. The light-emitting layer includes a third organic compound having a HOMO level differing from the HOMO level of the second organic compound by from −0.2 eV to +0.2 eV and a light-emitting substance having a hole-trapping property with respect to the third organic compound.

A core-shell type quantum dot comprising, a semiconductor nanocrystal core including at least In and P, and having group III-V elements as constituent elements and a single or a plurality of semiconductor nanocrystal shells having group II-VI elements as constituent elements covering the semiconductor nanocrystal core, wherein a buffer layer comprising semiconductor nanocrystals having group II-V elements as constituent elements is included between the semiconductor nanocrystal core and the semiconductor nanocrystal shell. As a result, quantum dots using group II-V semiconductor nanocrystals as a core and having improved fluorescence emission efficiency are provided.

A light emitting element that includes a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode is provided. The emission layer includes a polycyclic compound represented by Formula 1. The light emitting element shows a high emission efficiency and long-life characteristics.

A light-emitting device with high emission efficiency is provided. A light-emitting device with high reliability is provided. A light-emitting device with high emission efficiency and high reliability is provided. The light-emitting device includes a first electrode, a second electrode, a light-emitting layer positioned between the first electrode and the second electrode, and a cap layer. The second electrode is positioned between the light-emitting layer and the cap layer. The cap layer includes at least a first substance and a second substance. The first substance and the second substance are substances having a difference of 0.1 or more between ordinary refractive indices of respective evaporated films at a wavelength of 380 nm to 760 nm. The first substance is a monoamine compound having an alkyl group. The second substance is an organic compound having a carbazole skeleton.

A light-emitting diode (LED) and a display device including the LED are provided. The LED of an embodiment includes: a first electrode; a hole transport region disposed on the first electrode; an emission layer disposed on the hole transport region; an electron transport region disposed on the emission layer; and a second electrode disposed on the electron transport region, wherein the hole transport region includes: a first hole transport layer disposed adjacent to the first electrode and having a first refractive index; a second hole transport layer disposed adjacent to the emission layer and having a second refractive index; and a third hole transport layer disposed between the first hole transport layer and the second hole transport layer and having a third refractive index higher than each of the first and second refractive indices, thereby exhibiting high light extraction efficiency and high emission efficiency characteristics.

Provided are an emission material that can be used to obtain an organic EL device having high emission efficiency and a long lifetime, and an organic EL device including the emission material. Specifically, provided are an emission material represented by the following general formula (1) and an organic EL device including the emission material: wherein each A1 independently represents CR1, C or N and each R1 independently represents hydrogen or the like, provided that the number of N present in one 6-membered ring containing A1 is 2 or less; a ring E represents a heterocycle represented by formula (1a), and is fused with an adjacent ring at any position; and a, b, c, and d each independently represent 0 or 1, and there is no occurrence in which all a, b, c and d represent 0.

This application relates to the field of cold cathode field emission material preparation technology, and discloses a method for preparing a graphene-diamond composite structure to improve the field emission performance of diamond. The method involves first dispersing nanodiamonds and graphene oxide in a deep eutectic solvent; then adding boric acid to induce an in-situ sol-gel transformation under heating, forming a gel network that locks the dispersed phase; followed by microwave-assisted interface activation and gradient high-temperature carbonization, and finally cleaning and drying to obtain the product. This invention effectively suppresses phase separation and agglomeration during pyrolysis through a gel solidification mechanism, and utilizes the deep eutectic solvent and boric acid pyrolysis to achieve in-situ co-doping of nitrogen and boron, constructing a low-barrier continuous conductive channel on the diamond surface, and realizing tight electrical interconnection between components. This method is simple and controllable, and the resulting composite material possesses excellent conductivity, low turn-on electric field, and high emission stability, thus improving the electron emission efficiency of cold cathode devices.

The application provides a di-tert-butyl aniline donor-based organic heat delayed fluorescence material and a preparation method, belongs to the technical field of organic light-emitting diodes, and takes di-tert-butyl aniline donor as a core to synthesize three kinds of organic heat delayed fluorescence materials; the acceptor group R adopted in the application has strong rigidity, can effectively inhibit non-radiative transition of molecules, improve the efficiency of an organic electroluminescent device, and introduce a tert-butyl group on the di-tert-butyl aniline donor, so that the spatial steric hindrance of the molecules can be improved, concentration quenching caused by molecular stacking can be inhibited, and the emission efficiency of the device can be improved; in addition, the acceptor group R has strong electron-withdrawing capacity, and the combination of the tert-butyl group can make the luminescence wavelength of the organic electroluminescent device red-shift, realize orange-red light / red light emission, and has high external quantum efficiency, and the highest external quantum efficiency can reach 11.7%, has an optimistic application prospect, and is expected to be widely applied in the fields of illumination and display.