131 results about "Absorption band" patented technology

The invention belongs to the technical field of water pollutant identification, and particularly relates to a water pollutant distinguishing method and system based on multi-source spectrum fusion. According to the method, ultraviolet visible spectrum data and three-dimensional fluorescence spectrum data are effectively integrated in a multi-source spectrum data fusion mode, so that the characteristic information of water pollutants is captured, stably appearing characteristic absorption wavebands can be positioned by utilizing the ultraviolet visible spectrum data, and the water pollutants can be accurately detected. The method comprises the following steps: identifying a characteristic sub-region capable of representing the fluorescence response characteristic of a pollutant through three-dimensional fluorescence spectrum data, in a characteristic extraction stage, performing first-order derivative operation on an ultraviolet visible spectrum to position an absorption peak position, calculating curvature distribution of a three-dimensional fluorescence spectrum to identify the characteristic sub-region, and when a fusion characteristic is generated, performing first-order derivative operation on the three-dimensional fluorescence spectrum to identify the characteristic sub-region; according to the method, the key operation parameters are subjected to grid search optimization, and the optimal key operation parameter combination is screened out by performing multiple rounds of iterative training and evaluation on a preset training set and a verification set, so that the recognition performance of the real-time collected water sample is improved.

The invention relates to a PVB (polyvinyl butyral) composite film as well as a preparation method and application thereof. The PVB composite film is prepared from the following raw materials in parts by weight: 100 parts of PVB resin, 1-10 parts of nano praseodymium oxide, 1-10 parts of a dispersing agent, 0.01-1 part of a coupling agent and 20-50 parts of a plasticizer. The nano praseodymium oxide is added into the PVB resin, and the infrared absorption band of the PVB composite film is optimized by utilizing the infrared absorption performance, chemical stability and heat-resistant stability of the nano praseodymium oxide, so that infrared radiation can be efficiently blocked, and the excellent heat insulation effect and long-term use stability of the PVB composite film are realized. Furthermore, the nano praseodymium oxide is modified by a coupling agent, so that the dispersion uniformity of the nano praseodymium oxide in the PVB resin and the interface bonding force of the nano praseodymium oxide and the PVB resin are improved, the light transmittance loss of the PVB composite film is reduced, and the mechanical property and the heat insulation property of the composite film are improved.

The invention discloses a near-infrared dichroic dye, a liquid crystal composition and application of the near-infrared dichroic dye and the liquid crystal composition. The structural general formula of the disclosed dichroic dye is as shown in formula I in the specification. According to the invention, a hydrogenated quinoline ring, a hydrogenated benzopyran ring and a hydrogenated naphthalene ring are introduced into a molecular skeleton, so that the novel near-infrared dichroic dye with high light stability, high solubility, high order parameter and high light modulation capability is obtained. Compared with the near-infrared dichroic dye disclosed in the prior art, the absorption band is further subjected to red shift, and the light modulation capability is remarkably improved; ordering parameters are greatly improved, and the application bottleneck is solved.

The invention discloses a low-pass high-absorption energy selection surface based on a magnetic material, which comprises a plurality of periodically distributed units, and each unit comprises a magnetic material layer and an energy selection layer which are tightly attached from top to bottom; wherein the selectable layer comprises a dielectric substrate, and first to seventh metal structures and first to eighth diodes which are arranged on the dielectric substrate. A complete loop is formed through a plurality of diodes, and through impedance matching between a magnetic material and an optional layer, when low-power electromagnetic waves are incident, a low-frequency passband with low insertion loss is realized, and an ultra-wide absorption band is realized at a high-frequency position; when high-power electromagnetic waves are incident, high shielding effectiveness is achieved in a working frequency band, and an ultra-wide absorption band is achieved outside the band. The device is simple in overall design structure, clear in principle, convenient to machine, low in cost and very wide in application prospect.

The invention discloses a ferrous sulfide-barium titanate wave-absorbing material and a preparation method thereof, and belongs to the technical field of novel wave-absorbing materials.The wave-absorbing material is prepared through a two-step hydrothermal method, firstly, thiourea and ferrocene are mixed through the hydrothermal method to prepare ferrous sulfide, and then the ferrous sulfide and the ferrocene are mixed through a hydrothermal method to prepare the ferrous sulfide-barium titanate wave-absorbing material. Barium chloride, butyl titanate and the prepared ferrous sulfide are subjected to a reaction through a hydrothermal method, a ferrous sulfide-barium titanate composite material is obtained, and the wave absorbing performance of the composite material is adjusted by adjusting the content of barium titanate in the composite material. The ferrous sulfide-barium titanate composite wave-absorbing material prepared by the method has the advantages of lower density, wider effective absorption frequency band, higher electromagnetic wave absorption performance, simple preparation method, capability of regulating and controlling the morphology of the composite material and the like.

A non-dispersive near infrared light is used for detecting analyte gases in a testing zone. A sample obtained from the testing zone is irradiated with a reference light and with test lights. The test lights are emitted in sequence and modulated to be out of phase with the reference light. Frequencies of the test lights are in the absorption bands of particular analyte gases, with the reference light frequency being outside of the absorption bands. Analyte presence in the sample is identified by sensing changes in differences over time of test light and reference light intensity. Before irradiating the sample, the lights are optically conditioned by aligning them on the same path, and splitting the bandwidth of some lights for detecting analytes with overlapping absorption bands.

The invention discloses an ultra-wideband high-efficiency absorber in the technical fields of optics, material science and energy, which takes silicon dioxide (SiO2) as a substrate, and a titanium (Ti) nano rectangular body array is arranged above the substrate; a silicon nitride (Si3N4) regular hexagonal prism array is constructed on the top of the titanium layer, six cylindrical holes are etched in the midpoint of each vertex of a regular hexagon on the bottom surface of the titanium layer, and magnesium fluoride (MgF2) is filled in the cylindrical holes to form magnesium fluoride nano cylinders; a chromium (Cr) ring and a silicon nitride ring are sequentially superposed at the top end of the hexagonal prism and are tangentially matched with the hexagon on the top surface of the hexagonal prism. According to the UWB-HEA, the incident wavelength ranges from 400 nm to 4000 nm, the designed efficient absorption range (namely absorption band) of the UWB-HEA covers from near-infrared 855 nm to mid-infrared 3540 nm, about 2685 nm, the average absorption rate of 96.67% is achieved under TM waves, and the highest absorption rate is 99.66%; the average absorption rate of 96.44% is achieved under TE waves, the highest absorption rate is 99.72%, and the absorption rate is almost unrelated to polarization. In order to reduce radiation energy loss of an object, an ideal solar heat absorber needs to realize efficient light absorption in a wide wave band range.

Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorp-tion spectrum of the phosphorescent compound.

The invention discloses a broadband wave-absorbing metamaterial with a robust topological gradient structure, and relates to a broadband wave-absorbing metamaterial with a gradient structure. The invention aims to solve the technical problem that an existing metamaterial with a stepped structure is poor in electromagnetic wave absorption effect. By introducing the regular hexagonal blind hole structure on the top of the metamaterial, multiple scattering and reflection can be realized, and meanwhile, the characteristic that the material is insensitive to the incident angle of electromagnetic waves is improved; meanwhile, the side surfaces are inclined surfaces, so that multiple times of reflection, refraction and scattering of electromagnetic waves in the structure can be increased, the optimal synergistic effect is achieved among the layers, and an electromagnetic trap with great affinity to the electromagnetic waves is formed; when electromagnetic waves pass through the stacked structures, the electromagnetic waves are gradually guided, dispersed and absorbed, so that the problem of narrow absorption frequency band caused by over-limited resonance frequency of a single structure is avoided, and efficient absorption and regulation of broadband are successfully realized.

To provide an electromagnetic wave absorber having a high electromagnetic wave absorption characteristic, and a wide absorption band width.SOLUTION: An electromagnetic wave absorber includes a structure that a first dielectric body and a second dielectric body are laminated, and in which a complex dielectric constant in a maximum absorption frequency of the first and second dielectric bodies satisfies the following formulas (1) and (2): 8≤ε1'-ε2'≤40...(1), and 5.5≤ε1"-ε2"≤25...(2) (In formula (1), ε1' is a real part of the complex dielectric constant of the first dielectric body, and ε2' is a real part of the complex dielectric constant of the second dielectric body. In formula (2), ε1" is an imaginary part of the complex dielectric constant of the first dielectric body, and ε2" is an imaginary part of the complex dielectric constant of the second dielectric body.)SELECTED DRAWING: None

The invention provides a gradient wave-absorbing PMI (polymethacrylimide) foam material as well as a preparation method and application thereof, and the gradient wave-absorbing PMI foam material is prepared by the following steps: soaking PMI foam beads in an adhesive containing a wave-absorbing agent, and drying after soaking to respectively obtain wave-absorbing functional beads containing wave-absorbing agents with different loading capacities; sequentially paving the wave-absorbing functional beads containing the wave-absorbing agents with different loading capacities on the surface of a mold, and performing high-temperature foaming to obtain the gradient gradually-changing wave-absorbing PMI foam material; in the direction away from the surface of the mold, the loading capacity of the wave absorbing agent in the wave absorbing functional beads is sequentially increased, and the PMI foam material prepared by the preparation method is matched with air impedance through the surface low dielectric constant layer, so that incident reflection is reduced; the middle transition layer enhances electromagnetic wave penetration; the bottom high-loss layer deeply loses electromagnetic waves, the gradient dielectric change significantly widens the absorption frequency band, and the continuous gradient design eliminates the impedance step and interlayer air gap of the traditional multilayer structure, thereby avoiding interlayer separation and reflection loss.

Light-emitting element comprising: a first electrode (103); a light-emitting layer (703) over the first electrode (103), the light-emitting layer (703) comprising a guest material and a host material; and a second electrode (108) above the light-emitting layer (703), where the maximum of the emission spectrum of the host material overlaps the absorption band at the longest wavelength side (the side of lowest energy) in the absorption spectrum of the guest material, wherein the difference between the energy value of the maximum of the emission spectrum of the host material and the energy value of the maximum of the absorption band on the lowest energy side in the absorption spectrum of the guest material, said maximum having an absorption wavelength corresponding to a direct transition from the singlet ground state to the lowest excited triplet state of the guest material, is 0.2 eV or less, wherein the maximum of the absorption wavelength of the absorption band on the longest wavelength side lies in a range from 490 nm to 530 nm, and wherein the host material is a material mixture of a heterocyclic compound and an aromatic amine compound or carbazole compound.

The present invention relates to a capsule luminescence pigment comprising a luminescent substance and a photochemically switchable absorber as a molecular switch, wherein the luminescent substance and the photochemically switchable absorber are dissolved and / or dispersed as separate molecules in a polymer particle, the luminescent substance has an energy transfer level relevant for luminescence, the photochemically switchable absorber has a first absorption spectrum in a first switching state and a second absorption spectrum in a second switching state, wherein the energy transfer level relevant for the luminescence of the luminescent substance falls significantly into an absorption band of the photochemically switchable absorber in the second switching state, so that significantly more intense luminescence of the luminescent substance occurs in the first switching state than in the second switching state of the photochemically switchable absorber.The present invention further relates to a switchable luminescent printing ink comprising a capsule luminescent pigment as described herein and to a security document, preferably a banknote, comprising an imprint with a first switchable luminescent printing ink as described herein.

The invention discloses a low-cost portable NDIR (Non-Dispersive Infra-Red) exhaled gas acetone detection device and an application method thereof, a constant current driving module is used for guaranteeing the stability of a base line, an infrared light source module is used for providing a stable intermediate infrared radiation source, an infrared light source is used for covering an acetone characteristic absorption wave band, and a gas absorption pool module is used for improving the detection sensitivity; the dual-channel infrared detection module is used for accurately capturing a light intensity attenuation signal of an acetone characteristic absorption wave band and realizing differential detection and anti-interference compensation, and the signal acquisition and amplification module is used for extracting an effective component related to the acetone concentration from a weak signal output by a pyroelectric detector; the upper computer processing module is used for performing differential operation and concentration inversion and calculating the concentration value of acetone in exhaled air; by fusing an MEMS infrared light source, a multiple reflection light path and a two-channel differential detection technology, high-sensitivity detection is realized, and a popular portable solution is provided for early screening of diabetes mellitus metabolic disorder and lung cancer.

The present invention belongs to the technical field of photothermal conversion materials and specifically discloses a photothermal conversion eutectic material, its preparation method, and application. The photothermal conversion eutectic material includes an electron donor and an electron acceptor. The electron donor is an aromatic vinyl compound containing a D-π-A system, which is combined with the electron acceptor to form a photothermal conversion eutectic material. The material has excellent photothermal conversion performance, an absorption band of up to 220-2000nm, and can effectively utilize light across a wide wavelength range. It also has a high photothermal conversion efficiency, particularly a near-infrared photothermal conversion efficiency of up to 90.04%. The photothermal conversion eutectic material of the present invention can be prepared by a simple solvent volatilization or solid-phase grinding process, without the need for strict condition control, making it suitable for widespread promotion and use. It has good application prospects in photothermal imaging, photoacoustic imaging, seawater desalination, shape memory devices, photothermal-electric devices, photothermal deicing, and photothermal therapy equipment.

The present invention discloses an ABX3 perovskite composite electromagnetic wave absorption material and a preparation method, which belongs to the field of electromagnetic wave absorption material preparation. The first step is to prepare ABX3 perovskite by dry grinding, and then dry and heat treat it. The second step is to uniformly mix and compound the prepared ABX3 perovskite with carbon nanotube materials according to different mass ratios. The present invention adopts a solvent-free method to prepare ABX3 perovskite-type absorption material, which is in the form of irregular nanoparticles and forms a conductive network structure with carbon nanotubes. The suitable structure constructed in this way has a strong absorption effect on electromagnetic waves and has a wide absorption band. The material preparation method does not require toxic solvents, has simple synthesis equipment, low cost, few processes, high yield, and is suitable for large-scale preparation.

A first difference spectrum between a sample spectrum of a test sample and a reference spectrum of a reference sample of which concentration of a specific component is lower than the test sample is calculated (S10); using multiple reference spectra acquired by measuring the reference sample for multiple times, a difference spectrum having a shape similar to the first difference spectrum is selected from multiple difference spectra between two reference spectra (S20); a second difference spectrum based on the selected difference spectrum and the first difference spectrum is calculated (S30); and a shape of an absorption band of the specific component is acquired from the second difference spectrum to determine the concentration of the specific component (S40).

The invention discloses a CaLaPrNdGdFeO perovskite high-entropy ferrite wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The chemical composition of the material is (Ca < 0.2 > La < 0.2 > Pr < 0.2 > Nd < 0.2 > Gd < 0.2 >) FeO3. The preparation method comprises the following steps: dissolving metal nitrate and a complexing agent in water, adjusting to alkalescence to obtain a metal ion-complexing agent solution, heating to obtain gel, aging, drying and carrying out self-propagating reaction to obtain precursor xerogel; and then grinding, pre-sintering and carrying out heat treatment. The ferrite wave-absorbing material composed of the equimolar high-entropy components fully solves the disadvantages of narrow effective wave-absorbing frequency band and poor low-frequency performance stability of the traditional ferrite, has the advantages of strong synthesis stability, good oxidation resistance, high absorption efficiency and stable performance, can absorb electromagnetic waves in the microwave band of 2-18 GHz, and has a wide application prospect. And the material can be used in the fields of stealth coatings, electromagnetic shielding, 5G communication devices and the like.

This invention discloses a low-pass, high-absorption energy selective surface based on magnetic materials, comprising multiple periodically distributed units. Each unit includes, from top to bottom, a magnetic material layer and an energy selective layer. The energy selective layer includes a dielectric substrate, and first to seventh metal structures and first to eighth diodes disposed on the dielectric substrate. This invention achieves a low-intervention, low-frequency passband with low insertion loss and an ultra-wide absorption band at high frequencies by forming a complete circuit through multiple diodes and impedance matching between the magnetic material and the energy selective layer. When low-power electromagnetic waves are incident, it achieves high shielding effectiveness within the operating frequency band and an ultra-wide absorption band outside the band. The overall design of this invention is simple, the principle is clear, it is easy to manufacture, and it is inexpensive, with broad application prospects.

The invention belongs to the field of stealth materials, and relates to a structural high-strength broadband infrared radar compatible patch and a preparation method thereof. The structure of the patch is designed, and the patch sequentially comprises an infrared layer 1, a first wave absorbing layer 2, a second wave absorbing layer 3 and a back adhesive layer 4 from top to bottom. Wherein the infrared layer 1 is used for achieving the infrared stealth effect of the patch, the first wave absorbing layer 2 and the second wave absorbing layer 3 are used for achieving the radar stealth function of the patch, the first wave absorbing layer 2 and the second wave absorbing layer 3 adopt different types of absorbents, the content of the absorbents and the thickness of the wave absorbing layers are controlled, the absorption frequency band of the patch can be adjusted, and the broadband absorption effect is achieved. Meanwhile, the interface compatibility between the absorbent and the rubber is improved through the coupling agent, and chemical bonds are formed, so that the patch has high mechanical properties; in addition, the patch prepared by the invention also has good environment resistance.

Light-emitting element comprising: a first electrode (103); a light-emitting layer (703) above the first electrode (103), wherein the light-emitting layer (703) comprises a guest material and a host material; and a second electrode (108) above the light-emitting layer (703), where a fluorescence spectrum of the host material and a phosphorescence spectrum of the host material overlap the absorption band on the longest wavelength side (the side of lowest energy) in the absorption spectrum of the guest material, wherein the difference between the energy value of the maximum of the fluorescence spectrum of the host material and the energy value of the maximum of the absorption band on the side of the lowest energy in the absorption spectrum of the guest material, wherein this maximum has an absorption wavelength corresponding to a direct transition from the singlet ground state to the lowest excited triplet state of the guest material, is 0.2 eV or less, wherein the host material is a mixture of a heterocyclic compound and an aromatic amine compound or carbazole compound, and where the level of a triplet excitation energy of the host material is higher than the level of a triplet excitation energy of the guest material.

The invention relates to the field of luminescent materials, and particularly discloses near ultraviolet excited blue fluorescent powder and application thereof, the molecular formula of the fluorescent powder material is Ca3Lu2Si3O12: xCe < 3 + >, x is the molar doping amount of Ce < 3 + >, 0 lt; and x is less than or equal to 0.10. The preparation method of the series of blue fluorescent powder adopts a high-temperature solid-phase method for synthesis, is mature in process and has large-scale production potential. The fluorescent powder shows nearly 100% internal quantum efficiency, the value of the internal quantum efficiency is as high as 99%, the fluorescent powder has broadband emission in the range of 350-600nm and has high matching degree with a blue light absorption band of a plant photosynthetic pigment, and a blue light LED device with high brightness and good matching with plant pigment absorption can be obtained by assembling the blue light material and a 365nm purple light chip.

The invention relates to a sensor (1) for simultaneously measuring a pressure and a velocity, comprising: - a crystal (2) comprising a face covered with a reflective layer (3); - a pumping laser (4) configured to emit a pumping beam (F1) towards the crystal and having a wavelength comprised in an absorption band of the crystal so that the illumination of the crystal by the pumping beam excites a portion of the electrons of the crystal; - a spectrometer (6) for receiving a luminescence signal (S1) resulting from the de-excitation of the electrons of the crystal, and for measuring the variation over time in the wavelength of the spectral lines of the luminescence signal; - an interferometry system (12) configured to measure the variations in velocity of the reflective layer over time by means of laser Doppler velocimetry.

The application discloses a kind of quasi-terahertz wave full absorption metasurface absorber and preparation method thereof, the structure of absorber includes: the design of silica layer, graphene multilayer structure and metal base;The structural design of top silica four pyramid;The structural design of multilayer graphene electric control simultaneously.The application uses multilayer graphene to enhance terahertz wave absorption, through the control of external bias voltage, can control the absorption intensity of low-frequency absorption band, realize certain degree of tunability.In terahertz wave band, the metasurface absorber proposed in the application can reach 96.33% average absorption in 0.5-10.0THz band.The application can effectively solve the problem that current absorber can only absorb part of terahertz wave band, open a new road for high performance of terahertz wave absorption field device.

This invention relates to the fields of atmospheric physics and remote sensing, and particularly to a method and system for obtaining upward atmospheric transmittance in the infrared absorption band. The method includes: directly measuring solar spectral data from the ground; simultaneously measuring atmospheric composition profiles in the directions of the sun and satellite; calculating the downlink measured transmittance based on the measured data; calculating the downlink and uplink theoretical transmittance based on the profiles using a radiative transfer model; comparing the downlink measured and theoretical transmittance to verify errors; calculating a correction coefficient based on the uplink and downlink theoretical transmittance; and using this correction coefficient to correct the downlink measured transmittance to obtain the final uplink atmospheric transmittance. The system includes spectral measurement, profile measurement, and data processing units for implementing the above method. This invention combines the high precision of direct measurement with the physical extrapolation capability of theoretical models, solving the problem of obtaining high-precision uplink atmospheric transmittance and providing a reliable technical solution for satellite remote sensing calibration.

Light-emitting element, comprising: a pair of electrodes; and a first light-emitting layer and a second light-emitting layer between the pair of electrodes, where the second light-emitting layer is in contact with the first light-emitting layer, wherein the first light-emitting layer comprises a first phosphorescent compound, a first organic compound and a second organic compound, wherein the second light-emitting layer comprises a second phosphorescent compound, the first organic compound and the second organic compound, wherein the first organic compound and the second organic compound form an exciplex, the first organic compound is a nitrogen-containing heteroaromatic compound, where the second organic compound is a π-electron-rich heteroaromatic compound or an aromatic amine compound, where a peak of an emission spectrum of the first phosphorescent compound has a shorter wavelength than a peak of an emission spectrum of the second phosphorescent compound, and where the difference between the energy of a peak in an emission spectrum of the exciplex and the energy of a peak in an absorption band on the longest wavelength side in an absorption spectrum of the first phosphorescent compound is 0.2 eV or less.

The present invention discloses a class of perylene diimide luminescent crystals with the characteristics of a magic-angle stacking structure and their applications. In the perylene diimide luminescent crystals with the characteristics of a magic-angle stacking structure, the imide region of the perylene diimide and the substituents are connected by a methylene group, and the types and sizes of the substituents can finely adjust the arrangement of molecules in the crystal. The perylene diimide luminescent crystals can be obtained by solution processing or vapor deposition, and their stacking mode is a staggered stacking, with the slip angle near the magic angle (54.7°), that is, the displacement along the long axis of the molecule and the displacement along the short axis have a crossing angle less than or equal to 30°. The luminescent crystals of the present invention have a broad absorption band in the visible light region, and the fluorescence is mainly in the deep red-near infrared region, and its fluorescence quantum yield ranges from 1% to 100%, and it can be applied in solar concentrators, organic electroluminescent devices, etc.

The application discloses a kind of perfect cutoff absorber of metasurface based on nano round structure, adopt nanometer cylinder and ring array grown on silicon dioxide, two groups of ring structure are respectively selected using dielectric material gallium arsenide and silicon.Optimizing structure parameter, wavelength from ultraviolet to mid-infrared, 0.913 average absorption is realized in absorption band 100-710nm, and average absorption is only 0.02 in non-absorption band 1260nm-20μm wave band.ER is 9.6dB, ED is 0.81, and CS is 0.0015nm ‑1 The perfect cutoff absorber provided by the application has exactly this spectral selectivity, which provides an effective method for designing ideal solar heat absorber, which has important application in the field of renewable energy, such as solar thermal photovoltaic and solar thermal energy application.

The invention belongs to the field of blood glucose detection, and relates to a high-sensitivity blood glucose noninvasive detection method and system based on polarized terahertz photoacoustic, which combines the advantages of terahertz wave band detection and photoacoustic detection, fully utilizes the chiral characteristics of glucose molecules, and adopts polarized terahertz photoacoustic to detect the blood glucose concentration. Polarization optical rotation change information is extracted through the time domain photoacoustic signal; by selecting the characteristic absorption wave band of glucose and utilizing the difference between glucose and other blood components in chiral characteristics, the influence of water and other high-concentration ions on terahertz signals is remarkably reduced, so that the selectivity and the anti-interference capability of blood glucose detection are effectively improved; terahertz non-ionizing radiation is adopted as an excitation source, no ionizing injury risk is caused to a human body, and the device is suitable for long-term repeated detection and is expected to be popularized and applied in wearable or bedside monitoring equipment.

To provide a light-emitting element with high external quantum efficiency and low driving voltage.SOLUTION: A light-emitting element includes, between a pair of electrodes, a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound, wherein the first organic compound and the second organic compound form an exciplex, a light emission spectrum of the exciplex overlaps with an absorption band located at the longest wavelength side in an absorption spectrum of the phosphorescent compound, and a peak wavelength of the light emission spectrum of the exciplex is equal to or longer than the peak wavelength of the absorption band located at the longest wavelength side in the absorption spectrum of the phosphorescent compound.SELECTED DRAWING: Figure 1