36 results about "Luminous efficacy" patented technology

An illumination light source and an illumination device. The illumination light source comprises at least one light-emitting diode chip (100) that emits light of at least two wavebands; the emitted light at least comprises a plurality of wavelengths in a waveband of 420-740 nm, has spectral continuity, and at least comprises two characteristic wavelengths, the two characteristic wavelengths comprising at least one wavelength of 470-520 nm and at least one wavelength of 540-600 nm. The illumination light source using the light-emitting diode chips (100) capable of emitting light of at least two wavebands has full-spectrum continuity and a high color rendering index, thereby providing a high degree of color fidelity of objects at night and improving the recognition capability of night travelers; and the illumination light source further has a plurality of characteristic wavelengths on the basis of the full spectrum, such that the illumination light source has the characteristics of high photopic and scotopic luminous efficacy, high road surface reflectance, high penetration through rain, fog, and haze, and improved alertness, outdoor illumination safety is comprehensively considered, and night travel safety is guaranteed.

The utility model relates to the field of lighting, and discloses an LED light source device and lighting equipment. The white ink layer is positioned on the upper surface of the substrate; mounting holes are distributed in the white ink layer; the LED chip is positioned on the upper surface of the substrate and is electrically connected with the substrate through the mounting hole; the white glue reflecting layer is positioned on the surface of the white ink layer and is positioned around the LED chip; and the fluorescent colloid is positioned on the surface of the white glue reflecting layer and covers the LED chip. The white glue reflecting layer is located on the upper surface of the white ink layer, and the white glue reflecting layer has the characteristic of high temperature resistance, is not prone to discoloration at the high temperature and ensures long-term lighting effect stability, so that a good reflecting effect can be achieved on light emitted by the LED chip, the lighting effect of the LED light source device is improved, and the service life of the LED light source device is prolonged. And the problems of color temperature dispersion and poor color consistency can be solved, and the chromaticity stability is improved.

This invention relates to the field of semiconductor optoelectronic devices, specifically disclosing a Micro-LED epitaxial structure, which sequentially comprises a substrate, a buffer layer, an N-type GaN layer, a stress relief layer, a first superlattice layer, an electron modulation layer, a light-emitting layer, a hole modulation layer, a second superlattice layer, and a P-type GaN layer; the stress relief layer includes In... α Ga 1‑α The N-layer and the first GaN layer; the first superlattice layer includes In. x Ga 1‑x N-layer and second GaN layer; electronic modulation layer includes Al a Ga 1‑a The light-emitting layer includes an N-layer and a third GaN layer, and the light-emitting layer includes an In layer. y Ga 1‑y N quantum well layer and quantum barrier layer, hole modulation layer including Al b Ga 1‑b N layers and In c Ga 1‑c N-layer, the second superlattice layer includes In z Ga 1‑z The N-layer and the fourth GaN layer have the following parameters: y > x > α, y > z, a ≥ b, and the number of periods in the light-emitting layer is ≤ 8. Implementing this invention can improve the luminous efficacy and luminous uniformity of Micro-LEDs at low current densities.

The invention discloses an LED chip with a bionic structure and a manufacturing method thereof. The LED chip with the bionic structure comprises a substrate, a P electrode, a P-GaN layer, an MQW layer, an N-GaN layer and an N electrode which are sequentially stacked from bottom to top, a first vertical hole is formed in the P electrode, a second vertical hole is formed in the P-GaN layer, a third vertical hole is formed in the MQW layer, a fourth vertical hole is formed in the N-GaN layer, the first vertical hole, the second vertical hole, the third vertical hole and the fourth vertical hole are communicated with one another, and the cross sections of the first vertical hole, the second vertical hole, the third vertical hole and the fourth vertical hole are all regular hexagons. The plurality of first vertical holes, the plurality of second vertical holes, the plurality of third vertical holes and the plurality of fourth vertical holes are distributed in a hexagonal honeycomb network to form a vertical hole group; a P layer transverse hole is formed in the P-GaN layer, an N layer transverse hole is formed in the N-GaN layer, and insulating heat conduction materials are arranged in the first vertical hole, the second vertical hole, the third vertical hole, the fourth vertical hole, the P layer transverse hole and the N layer transverse hole. The invention aims to solve the technical problem that the performance of an LED chip is limited due to the fact that high luminous efficiency and efficient heat dissipation are difficult to consider at the same time in the prior art.

This invention discloses an LED spectral distribution optimization design method and an LED light source. The design method includes the following steps: S1, establishing a basis function library based on the Gaussian emission spectral function of phosphor materials; S2, defining the full spectral distribution function and optimization variables of the phosphor mixture; S3, constructing a comprehensive evaluation function and constraints based on color temperature, spectral efficacy, and color rendering index; S4, applying simulated annealing algorithm for optimization, aiming to minimize the comprehensive evaluation function, and globally optimizing the basis function weight vector w; S5, adjusting the comprehensive evaluation function and constraints and iteratively optimizing. This design method is applicable to the spectral control of white LEDs excited by multi-color phosphors, and can achieve synergistic optimization of color rendering index, color temperature accuracy, and luminous efficacy over a wide color temperature range, significantly improving the overall light quality and design efficiency of the LED light source.

The invention relates to a fluorescent body structure for a high-luminous-efficiency product and application of the fluorescent body structure, and the fluorescent body structure solves the problem that light measured by an LED flip chip cannot be effectively output due to the fact that a light reflection shell (white glue) is in direct contact with the side wall of the LED flip chip. The fluorescent body is wrapped by the light reflection shell to form a corresponding angle, so that measured light is effectively reflected, and the lighting effect of a product is improved by 3%.

The present disclosure relates to organic electroluminescent compounds, multiple host materials, and an organic electroluminescent device comprising these. By incorporating a specific combination of compounds according to the present disclosure as multiple host materials, or by incorporating compounds according to the present disclosure, organic electroluminescent devices with improved driving voltage, luminous efficacy, and / or lifetime characteristics compared to conventional organic electroluminescent devices can be provided.

This application provides a method and system for cross-protocol lighting device synchronization control, an electronic device, and a medium. The method includes: dividing the communication link between the bridge-end device and the lighting device into four logical stages; the four logical stages include a device discovery stage, a queue scheduling stage, a wireless transmission stage, and a device execution stage; dynamically allocating jitter delay budgets for each logical stage; generating corresponding lighting control commands based on user-triggered lighting scenes; the lighting control commands include a target execution time point, a luminous efficacy transition curve, and the jitter delay budget; and sending the lighting control commands to the lighting device based on a reliable multicast protocol. This application, by employing a refined delay budget allocation mechanism and combining it with closed-loop feedback control of execution errors, can maintain high-precision, smooth, and stable synchronization between multi-protocol lighting devices under adverse conditions such as complex electromagnetic environments, high network loads, or sudden interference.

The present disclosure relates to an organic electroluminescent compound, several host materials, and an organic electroluminescent device comprising these. By incorporating the organic electroluminescent compound and the several host materials, an organic electroluminescent device can be provided which exhibits improved luminous efficacy and / or lifetime characteristics compared to conventional organic electroluminescent devices.

Lighting fixture (100A, 100B) for producing a luminous efficacy, wherein the lighting fixture comprises: a control circuit board (175) comprising an opening (200) and a first number of circuit board layers, the control circuit board having a first area; and a light module circuit board (110A, 110B) configured to be electrically connected to the control circuit board at the opening, the light module circuit board comprising a second number of circuit board layers, the light module circuit board having a second area, the light module circuit board comprising a plurality of light-emitting diodes, LEDs, (300) and a plurality of conductor tracks (205, 305), the light module circuit board being configured to be directly coupled to the control circuit board via the plurality of conductor tracks such that the plurality of LEDs are positioned in the opening and light from the plurality of LEDs passes through the opening; wherein the multitude of LEDs are electrically connected to the first and second conductor tracks from the multitude of conductor tracks, and the first and second conductor tracks from the multitude of conductor tracks are electrically connected to the first and second complementary conductor tracks on the control circuit board; where the first number of printed circuit board layers is greater than the second number of printed circuit board layers, and where the first area is larger than the second area.

The LED lamp bead comprises an LED support, an electric conductor and a plurality of LED wafers, the LED support comprises a cofferdam, a first bonding pad and a second bonding pad, and the first bonding pad and the second bonding pad are arranged at the bottom of the cofferdam at intervals; the electric conductor is arranged on the first bonding pad and is electrically connected with the first bonding pad; the LED wafers are arranged on the first bonding pad, a conductor is arranged between at least one group of adjacent two LED wafers, at least one LED wafer is welded and conducted with the second bonding pad through a first crystal wire, at least one LED wafer is electrically conducted with the conductor through a second crystal wire, and the LED wafers are connected with the first bonding pad without crystal wires. The LED lamp bead is novel in structure, no crystal wire is needed between the LED wafer and the first bonding pad, and therefore on the premise that the size of the LED support is not changed, the crystal fixing area originally occupied by the crystal wire is completely released to the LED wafer, the maximum arrangement of the size of the LED wafer is achieved, and the lighting effect of the single LED lamp bead is remarkably improved.

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent material, as described in Formula 1, and to an organic electroluminescent device comprising these. By incorporating the compound according to the present disclosure, an organic electroluminescent device with a lower driving voltage, higher luminous efficacy, and / or improved lifetime compared to the prior art can be provided.

This invention discloses a Mn 4+ This invention relates to a surface treatment method for fluoride-doped red phosphors, belonging to the field of inorganic luminescent materials technology. The method first involves treating Mn with a fluoroniobic acid solution. 4+ Fluoride-doped red phosphors create Mn-depleted structures on the phosphor surface. 4+ A layer is added to improve its moisture resistance; then, hydrothermal treatment under a specific solution environment is used to improve the surface crystallization quality of the fluoride phosphor, further enhancing its moisture resistance. The surface-modified Mn obtained by the method of this invention... 4+ Fluoride-doped red phosphors not only maintain their original high luminous efficacy, but also have significantly improved moisture resistance, and can maintain high luminous efficiency for a long time even in high temperature and high humidity environments.

An LED chip and its fabrication method are disclosed. The LED chip includes a substrate, an epitaxial stack disposed on one side of the substrate, a transparent conductive layer, a first electrode, and a second electrode. The epitaxial stack includes a first type semiconductor layer, an active layer, and a second type semiconductor layer. The transparent conductive layer is disposed on the side of the second type semiconductor layer away from the active layer and includes an interface layer and a capping layer sequentially stacked along the direction away from the active layer. The work function of the interface layer is greater than the work function of the capping layer. The first electrode is electrically connected to the first type semiconductor layer. An extended electrode of the second electrode is disposed on the side of the second type semiconductor layer away from the active layer, and the transparent conductive layer covers the extended electrode. The top electrode of the second electrode is disposed on the side of the transparent conductive layer away from the extended electrode and is conductive to the extended electrode through the transparent conductive layer, or the top electrode is partially embedded in the transparent conductive layer and contacts the extended electrode to conduct electricity. This LED chip improves the uniformity of current distribution and enhances luminous efficacy by optimizing the lateral expansion and vertical injection of current.

This invention discloses a trapezoidal composite fluorescent glass-ceramic for laser illumination and its preparation method. The composite fluorescent glass-ceramic comprises a trapezoidal fluorescent glass and a high thermal conductivity ceramic coating on the outer layer of the fluorescent glass. The trapezoidal fluorescent glass is formed by melting and casting waste glass doped with luminescent ceramic powder, red phosphor, and high thermal conductivity powder. The composite glass-ceramic prepared by this invention achieves high-brightness white light emission under excitation by a 460nm blue LD chip, with a color rendering index of 82-91, and can withstand an excitation power density of 40W / mm². 2 ~55W / mm 2 Its luminous efficacy is 206–265 lm / W, and its thermal conductivity at room temperature is 18–29 Wm. ‑1 k ‑1 .

The invention discloses an LED epitaxial wafer structure and a preparation method thereof, and relates to the technical field of semiconductor photoelectric devices. The LED epitaxial wafer structure comprises a substrate, a buffer layer, an N-type limiting layer, an N-type barrier layer, an active layer, a P-type barrier layer, a P-type limiting layer, a P-type window layer and a P-type contact layer, the active layer comprises GaInP quantum dot layers and barrier layers, wherein the GaInP quantum dot layers and the barrier layers are periodically and alternately stacked. The GaInP quantum dot layer contains GaInP quantum dots, the density of the GaInP quantum dots is 1 * 10 < 9 > / cm < 2 > to 1 * 10 < 11 > / cm < 2 >, and the diameter of the GaInP quantum dots is 5 nm to 40 nm. According to the invention, the dislocation density can be effectively reduced, and the carrier limiting capability is improved, so that the internal quantum efficiency is improved, and the luminous efficiency of an LED chip is finally improved.

This utility model discloses an LED lighting device with adjustable luminous efficacy, relating to the field of LED lighting technology. It includes a lamp housing, with a connecting wire installed at the top and a junction box installed on the side of the connecting wire. A lampshade is engaged with the lower end of the lamp housing. An LED bead is disposed at the lower end of the lamp housing, and a rotating engaging mechanism for adjusting the angle of the LED bead is located at the middle position of the top of the lamp housing. This LED lighting device with adjustable luminous efficacy allows for adjustment of luminous efficacy by rotating a knob, which drives a limiting block to rotate synchronously. Since the limiting block is engaged in the middle position inside the LED bead, the knob synchronously drives the LED bead to rotate. By utilizing the different angles at which light passes through the lens as the LED bead rotates above it, the luminous efficacy can be adjusted, facilitating quick and easy adjustment of the lighting effect according to needs.

This invention belongs to the field of deep learning and discloses an intelligent scheduling method and system for reducing the dynamic luminous efficacy and power consumption of dual-crystal LEDs. The method includes: constructing a topological connection model reflecting the internal structure of the chip; establishing a thermodynamic state equation based on non-equilibrium thermodynamics and mapping it to a physical information neural network; using a graph neural network to model thermally coupled nodes to predict the non-equilibrium heat distribution field; and deriving and executing a current phase difference scheduling strategy capable of achieving thermal cancellation effects. The system includes modules for data acquisition, topology modeling, physical calculation, neural network processing, intelligent scheduling, and drive execution. By integrating thermodynamic laws and deep learning technology, this invention achieves refined control and predictive thermal control of thermal entropy flow, improving the transient thermal stability and electro-optical conversion efficiency of the system, and reducing redundant power consumption.

The chromaticity and luminous flux output of a multicolor luminaire with multiple independent wavelength outputs is controlled by a controller that has fewer input channels than there are output channels. A trained neural network is used such that the multi-color wavelength settings of the luminaire produce the specified chromaticity and luminous flux output while optimizing luminous efficacy or color rendering capabilities, or satisfying other constraints applied to the luminaire.

The invention provides a display device, a photoelectric conversion device, an electronic device, and a wearable device. The display device has pixels including a first pixel and a second pixel arranged adjacent to each other along a first direction. These pixels include a light emitting region and a color filter. The luminous efficacy of the first pixel is higher than the luminous efficacy of the second pixel. In a plan view, a center position of each color filter is offset in a first direction with respect to a center position of a corresponding light emitting region, and a length of the color filter of the first pixel parallel to the first direction is longer than that of the second pixel. In the first direction, the respective first pixels are periodically arranged, and a pitch of the color filters of the respective first pixels and a pitch of the light emitting regions of the respective first pixels are different from each other.

This invention discloses a low-current-density blue Micro-LED epitaxial structure and its fabrication method, relating to the field of semiconductor device technology. The multi-quantum-well emitting layer of the epitaxial structure comprises, sequentially stacked along the epitaxial direction, a violet multi-quantum-well layer, a light blue multi-quantum-well layer, a blue multi-quantum-well layer, and a violet-light-end quantum-well layer. Each of the violet, light blue, blue, and violet-light-end quantum-well layers includes, sequentially and periodically alternating N-polarity gradient InGaN layer before the well, an N-polarity InGaN quantum-well layer, an N-polarity gradient AlGaN layer after the well, and a Ga-polarity GaN quantum barrier layer. The N-polarity gradient InGaN layer before the well is an N-polarity InGaN material with an increasing In content along the epitaxial direction. This invention can significantly improve the luminous efficacy of Micro-LED chips at low operating current densities.

This utility model belongs to the field of street light technology and discloses a novel street light module that can improve luminous efficacy. It includes a heat sink, a lamp panel, a lamp cover, and a waterproof line. The lamp panel and lamp cover are installed on one side of the heat sink, with the lamp panel located between the lamp cover and the heat sink. The waterproof line is installed on the heat sink, passes through the heat sink, and connects to the lamp panel. LED beads are installed on the lamp panel. Lenses corresponding to each LED bead are machined on the lamp cover. Reflective paper is installed on the lamp panel, with clearances to avoid the LED beads. The inner wall of the lens is flush with the inner wall of the lamp cover. A focusing groove is machined on the side of the lens closest to the LED bead. A gap is left between the reflective paper and the lamp cover. The reflective paper is used to reflect the light scattered by the LED beads toward the lens. By setting the reflective paper, this utility model can concentrate the light reflected by the lens and the diffused light from the LED beads, and reflect it again from the lens, increasing the luminous efficacy of the street light module by 3~5 lm / W.

This invention relates to the field of intelligent lighting control technology, and discloses a multi-lamp collaborative control method and system based on ultra-wideband spatial positioning. The method includes acquiring ultra-wideband ranging data between lamps in a target lighting system; constructing a distance matrix based on the ultra-wideband ranging data, and reconstructing the spatial coordinates of each lamp using a spatial positioning method; acquiring luminous efficacy template parameters, and calculating the target luminous efficacy state function of each lamp based on its spatial coordinates and luminous efficacy template parameters; exchanging state information with neighboring lamps using a distributed consensus collaborative method and iteratively updating the state information until convergence conditions are met; and controlling the luminous efficacy output of the corresponding lamp based on the converged state information of each lamp. This invention enables high-precision multi-lamp linkage control without relying on real-time scheduling by a central controller, significantly improving the intelligence level, deployment efficiency, and user experience of the lighting system.

This application discloses a lamp fixture with a dual-color film, comprising a lamp tube, a lamp panel, and a plurality of LEDs. The outer surface of the lamp tube is covered with a dual-color film. The lamp panel is disposed inside the glass lamp tube. The plurality of LEDs are disposed on the lamp panel. By covering the outer surface of the lamp tube with the dual-color film, the film can effectively conceal adhesive residue on the lamp tube without affecting the luminous efficacy, thereby enhancing the aesthetics and perceived quality of the lamp tube.

This application provides a low beam headlight module and a vehicle headlight. The low beam headlight module includes: multiple light sources arranged at intervals along a first direction; the low beam lens includes a widening lens unit and an elbow lens unit, which are integrally formed structures. The widening lens unit and the elbow lens unit share a light-incident surface and a light-exit surface. The light-incident surface is arranged opposite to the multiple light sources along a second direction, and the light-exit surface is located on one side of the light-incident surface along a third direction; the widening lens unit is used to form a low beam widening light pattern, and the elbow lens unit is used to form a low beam elbow cutoff line light pattern. The low beam elbow cutoff line light pattern and the low beam widening light pattern are combined to form a low beam light pattern; the light-exit surface includes multiple sub-light-exit surfaces arranged sequentially along the first direction, and the distance between the root of each sub-light-exit surface and the light source in the third direction gradually increases along the first direction. The embodiments of this application can effectively improve the luminous efficacy of the low beam headlight module.

Disclosed are display devices including a substrate having a plurality of subpixels, a thin film transistor in each of the subpixels, an organic light emitting device including at least one light emitting layer in each of the subpixels connected to the thin film transistor, and a color filter corresponding to each of the subpixels and disposed on a second electrode of the organic light emitting device, wherein the at least one light emitting layer as a single layer includes at least one host, a first dopant as a phosphorescent dopant and a second dopant as a fluorescent dopant. In the light emitting layer, energy is transferred from a host and other dopants to one dopant by energy transfer system, thus it is possible to increase luminous efficacy of a single color and to increase lifetime of emission.

The chromaticity and luminous flux output of a multicolor luminaire with multiple independent wavelength outputs is controlled by a controller that has fewer input channels than there are output channels. A trained neural network is used such that the multi-color wavelength settings of the luminaire produce the specified chromaticity and luminous flux output while optimizing luminous efficacy or color rendering capabilities, or satisfying other constraints applied to the luminaire.

A transparent luminescent sheet and a lamp apparatus using the same are disclosed. The transparent luminescent sheet realizes a lamp function through emission of light from a sheet thereof configured to be transparent and secures a desired luminous efficacy and a desired freedom of design. In the transparent luminescent sheet, transparency is enhanced in a turn-off state and, as such, visibility is secured at the inside and the outside. A lit image is realized through light during a light emission operation. In addition, light emitted toward the inside is shielded or reduced, thereby preventing indoor dazzling.

A white light emitting device comprises: an LED that generates excitation light of wavelength from 420 nm to 480 nm; and photoluminescence materials that generate light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm. The device generates white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a Duv (Delta u, v) from 0.0060 to 0.0170 for the selected color temperature and wherein the device has an LER (Luminous Efficacy of Radiation) of at least 320 lm / Wopt.

The invention relates to an integrated circuit and a driving application circuit for a LED tunnel lamp using a three-phase alternating-current mains power supply. The integrated circuit includes a voltage stabilizing circuit (1), an under-voltage protection circuit (2), a comparison amplification circuit (3), and a low-voltage control circuit (4). The invention has the characteristics of high LED driving power source efficiency, high power factor (PF), small harmonic distortion, high reliability, good optical strobe resistance, low cost, etc. In addition, as a result of the three-phase alternating-current mains power supply, an input voltage is high, and for tunnel lamps with the same power, the current flowing through a wire cable of an illumination system is particularly small, such that the cost of the wire cable can be greatly reduced, the power source conversion efficiency is greater than 95%, the PF is greater than 0.92, the harmonic distortion is less than 20%, the optical strobe depth is less than 20%, and the luminous efficacy is increased by more than 20%.