28 results about "Blue light emitting diode" patented technology

The invention aims to provide a preparation method and application of a blue-light CsPbBr3 perovskite quantum dot, and belongs to the technical field of quantum dot preparation. According to the method, 1-ethyl-3-methylimidazolium hexafluorophosphate molecules are introduced to the surfaces of the quantum dots by using a heterogeneous ligand exchange strategy, and passivation of surface defects of the quantum dots and inhibition of Auger recombination are realized at the same time, so that the optical performance and stability of the quantum dots are improved, and the photoluminescence quantum yield is increased from 78% to 92%; according to a blue light emitting diode prepared based on the CsPbBr3 quantum dot, the maximum external quantum efficiency of 20.02% is achieved under the brightness of 6441 cd / m < 2 >, and the external quantum efficiency of nearly 19% is still achieved under the high brightness of nearly 10000 cd / m < 2 >; under the initial brightness of 106 cd / m < 2 >, the running half-life period of about 700 minutes is obtained; the preparation of the blue-light perovskite quantum dot light-emitting diode with high external quantum efficiency, high brightness, long service life and low efficiency roll-off is realized.

The invention relates to the technical field of medical education equipment, and discloses a spinal cord injury teaching model with sensory-motion plane visualization and voice guidance functions. Comprising a human body model body, a plurality of red light emitting diodes, a plurality of blue light emitting diodes, a plurality of micro steering engines, a key input module, a main controller, a voice synthesis module and a rechargeable power supply, when a spinal nerve segment, a body side and a muscle strength level are selected through the key input module, the main controller controls all red light-emitting diodes or blue light-emitting diodes, located on the spinal nerve segment and above the spinal nerve segment, in the selected body side to be turned on. And the control module is used for controlling the voice synthesis module to play voice contents corresponding to the selected spinal nerve segment, the selected body side and the selected muscle strength level, and driving the micro steering engine corresponding to the key movement muscle in the selected body side to rotate to a preset angle corresponding to the selected muscle strength level. The control module is used for controlling the voice synthesis module to play the voice contents corresponding to the selected spinal nerve segment, the body side and the muscle strength level.

This specification describes a dental imaging and / or curing system and methods of using it, optionally in combination with a fluorescent imaging aid applied to a tooth. In some examples, a system or kit described in this specification combines a fluorescent compound with an intra-oral device. The intra-oral device includes a light source to excite the fluorescent compound. The intra-oral device further includes a sensor to produce an image of fluorescent light emitted from the fluorescent compound. Optionally, the fluorescent compound can include positively charged nanoparticles including a fluorophore, for example fluorescein. Optionally, the intra-oral device can include a blue LED, a bandpass emission filter and a digital camera sensor. This specification also describes an intra-oral device and a method of producing an image of plaque, calculus or active carious lesions in the mouth of a person or other animal.

The application discloses a kind of high-performance ultra-wideband composite fluorescent ceramic for hyperspectral imaging and preparation method thereof.The composite fluorescent ceramic includes high thermal conductivity ceramic layer and fluorescent ceramic layer from bottom to top, high thermal conductivity ceramic layer is selected from one or more of Al2O3, BN, SiC, Si3N4, AlN, BeO, MgO;The chemical composition of fluorescent ceramic layer is 11MgO•22Al2O3·67SiO2-xCr2O3-yEu2O3, 0.001≤x≤0.01, 0.005≤y≤0.01.The composite fluorescent ceramic is prepared by glass melting, bonding sintering and glass crystallization steps.The fluorescent ceramic layer of the application is constructed by Eu 2+ →Cr 3+ Energy transfer transfer mechanism, efficient ET between Eu 2+ And Cr 3+ Ion can compensate Cr 3+ Emission loss at high temperature, still can maintain 86-94% fluorescent intensity at 473K.Under the excitation of 450-460nm blue light emitting diode, can emit wavelength at 500-1200nm ultra-wideband light emission.

A low-frequency-band radio measuring head circuit comprises a power supply module, a central control module connected with the power supply module, a trigger signal module, an indicating lamp module, and an antenna module and a crystal oscillator module which are connected with the central control module. Wherein the trigger signal module and the indicating lamp module are connected with the central control module; the trigger signal module comprises a radio communication measuring head, and the radio communication measuring head is electrically connected with a first detection point. And the reset circuit module is connected with the central control module. The system also comprises an internal filtering module connected with the central control module, and a power supply filtering module connected with the power supply module. The crystal oscillator module comprises a main crystal oscillator module and a low-frequency crystal oscillator module; and the main crystal oscillator module and the low-frequency crystal oscillator module are respectively connected with the central control module. The indicating lamp module comprises a plurality of groups of green light-emitting diodes, red light-emitting diodes and blue light-emitting diodes which are connected in parallel. The utility model has the beneficial effects of strong penetrating power, interference resistance and low equipment power consumption.

The present invention provides quantum dot (QD)-in-matrix materials for use in blue light emitting diodes, wherein the QD-in-matrix material comprises a plurality of quantum dots embedded in a doped lead perovskite matrix.

This invention relates to the field of semiconductor technology, specifically to a low-stress blue light-emitting diode epitaxial wafer and its fabrication method. The low-stress blue LED epitaxial wafer includes a substrate on which a stress buffer layer, a three-dimensional nucleation layer, a single-crystal two-dimensional GaN layer, an n-type layer, an active layer, an electron blocking layer, and a P-type ohmic contact layer are sequentially deposited. The n-type layer sequentially includes a first n-type layer, a second n-type layer, and a third n-type layer. The first n-type layer is a high-Si, low-In-content n-type InGaN layer; the second n-type layer is an n-type InGaN layer with gradually decreasing Si and In concentrations; and the third n-type layer is a low-Si-doped n-type GaN layer. The low-In-ratio n-InGaN layer and n-GaN transition layer design used in this invention effectively improves crystal quality, reduces defects, and significantly improves chip reliability and luminous efficiency.

There is provided is a display apparatus including a liquid crystal panel and a backlight unit configured to provide light to the liquid crystal panel. The backlight unit includes a substrate, a red light emitting diode mounted on a first surface of the substrate, a green light emitting diode mounted on the first surface of the substrate and a blue light emitting diode mounted on the first surface of the substrate. Each of the red light emitting diode, the green light emitting diode, and the blue light emitting diode includes at least two cells.

Light-emitting diode module, LED module, which is configured to emit white light, wherein the LED module has: a blue light-emitting diode (30) configured to emit blue light with a first peak wavelength in a range of 420 nm to 465 nm; at least one wavelength conversion material (54, 56) configured to convert part of the blue light into converted light of another wavelength; and a near-infrared wavelength conversion material (58) configured to be excited by the blue light of the blue light-emitting diode (30) to emit an additional light with a second peak wavelength in a range of 740 nm to 900 nm and a full width at half maximum (FWHM) of 120 nm or less, wherein the near-infrared wavelength conversion material (58) Ca(Al 12-x-y ,Ga y )O 19 :xCr 3+ (0≤x≤1, 0≤y≤6) exhibits, where the converted light, another part of the blue light, and the additional light combine to form the white light, and wherein a spectrum of the white light thus formed has a peak intensity in the range of 740 nm to 900 nm, and the peak intensity is greater than or equal to 4.5% of a peak intensity in a blue band from 420 nm to 465 nm.

Illumination light source (1), comprising: a light-emitting solid element (11); and a wavelength converter (12), wherein the wavelength converter (12) includes a wavelength conversion material which performs a wavelength conversion of a portion of the light emitted by the light-emitting solid element (11) and emits light of a different wavelength, the wavelength converter (12) emits a composite light consisting of the light emitted by the light-emitting solid element (11) and the light emitted by the wavelength conversion material, a correlated color temperature of the composite light lies in a range of 5700 K to 7100 K, a spectral distribution of the composite light exhibiting a first peak wavelength in a range of 430 nm to 470 nm, a second peak wavelength in a range of 490 nm to 540 nm, a third peak wavelength in a range of 600 nm to 640 nm, a first minimum value of intensity between the first peak wavelength and the second peak wavelength, and a second minimum value between the second peak wavelength and the third peak wavelength. a difference between the second peak value, which is of intensity in the second peak wavelength, and the first minimum value lies in a range of 30% to 55% with respect to the second peak value, a difference between the second peak and the second minimum value is in the range of 20% to 45% with respect to the second peak, the light-emitting solid element (11) is a blue light-emitting diode with a peak wavelength in the range of 430 nm to 470 nm, and The wavelength conversion material includes a blue-green fluorescent material with a peak wavelength in the range of 490 nm to 540 nm, a yellow fluorescent material with a peak wavelength in the range of 530 nm to 600 nm, and a red fluorescent material with a peak wavelength in the range of 600 nm to 670 nm.

Measuring arrangement for recording aging processes of individual light-emitting diodes (LEDs), comprising: - a plurality of light-emitting diodes (LEDs), comprising a red light-emitting diode (R), a green light-emitting diode (G) and a blue light-emitting diode (B); - a control unit (CTRL) set up for individual brightness intensity control of each of the light-emitting diodes (LEDs), wherein - at least one photodiode (FD), configured for measuring the brightness intensity of at least one light-emitting diode (LED), which is not the red light-emitting diode (R), is provided, whereby the red light-emitting diode (R) cannot be monitored, wherein the control unit (CTRL) is configured to detect a relative change in brightness intensity of each of the light-emitting diodes (LEDs) depending on a first measurement and a second time-delayed measurement, wherein the majority of light-emitting diodes (LEDs) and the photodiode (FD) are formed in such a way that they cannot be separated without destruction and all components are arranged in a common housing which has transparent or semi-transparent window areas.

This specification describes a dental imaging and / or curing system and methods of using it, optionally in combination with a fluorescent imaging aid applied to a tooth. In some examples, a system or kit described in this specification combines a fluoresecent compound with an intra-oral device. The intra-oral device includes a light source to excite the fluorescent compound. The intra-oral device further includes a sensor to produce an image of fluorescent light emitted from the fluorescent compound. Optionally, the fluorescent compound can include positively charged nanoparticles including a fluorophore, for example fluorescein. Optionally, the intra-oral device can include a blue LED, a bandpass emission filter and a digital camera sensor. This specification also describes an intra-oral device and a method of producing an image of plaque, calculus or active carious lesions in the mouth of a person or other animal.

The application discloses a kind of quasi-two-dimensional perovskite blue light LED's crystal orientation mechanism regulation research method, belong to display technical field, first establish quasi-two-dimensional blue light perovskite vertical growth theoretical model in the present application, construct theoretical basis, then through experiment, analysis different substrate and antisolvent temperature and substrate assembly process etc. Find the influence of different film forming process on quasi-two-dimensional blue light perovskite crystalline orientation, solve the problem that substrate and antisolvent temperature temperature hinder quasi-two-dimensional blue light perovskite light-emitting diode exciton radiative recombination, finally by analyzing the influence of different crystalline orientation on blue light PeLEDs performance to select more suitable process, and prepare high-performance blue light PeLEDs device, the present application is carried out complete experiment by quasi-two-dimensional blue light perovskite crystalline orientation different under different conditions, structure and process, and the influence of different crystal orientation on quasi-two-dimensional blue light PeLEDs performance, and develop blue light PeLEDs device.

This display module comprises: a substrate on which a plurality of thin film transistors are formed; and a plurality of pixels disposed on the plurality of thin film transistors. Each of the plurality of pixels includes a red LED, a green LED, and a blue LED. Among the plurality of pixels, at least one pixel in which the red LED or the green LED does not emit light includes a light conversion layer provided on the blue LED.

An optocoupler includes a light output chip and a light-sensing chip. A light-receiving surface of the light-sensing chip is disposed to face a light output surface of the light output chip. The light-sensing chip and the light output chip are a green light-emitting diode and a blue light-emitting diode, respectively. Accordingly, the optocoupler has a stable output performance at a working temperature ranging from −55° C. to 150° C. and a high response frequency.

A display apparatus including a circuit board; and a plurality of pixels formed on the circuit board, wherein at least one of a blue light emitting diode chip, a red light emitting diode part, and a green light emitting diode chip is disposed in each of the pixels, and the blue light emitting diode chip, the red light emitting diode part and the green light emitting diode chip are covered by a coupling structure.

The application aims to provide a preparation method and application of blue light CsPbBr3 perovskite quantum dots, and belongs to the technical field of quantum dot preparation. The method uses a heterogeneous ligand exchange strategy to introduce 1-ethyl-3-methyl imidazole hexafluorophosphate molecules on the surface of quantum dots, and simultaneously realizes passivation of defects on the surface of quantum dots and inhibition of Auger recombination, thereby improving the optical performance and stability of the quantum dots, and the photoluminescence quantum yield is increased from 78% to 92%; a blue light emitting diode prepared based on the CsPbBr3 quantum dots realizes a maximum external quantum efficiency of 20.02% under a luminance of 6441 cd / m 2 , and still has an external quantum efficiency of nearly 19% under a high luminance of nearly 10000 cd / m 2 ; under an initial luminance of 106 cd / m 2 , a running half-life of nearly 700 minutes is obtained; and the preparation of a blue light perovskite quantum dot light emitting diode with high external quantum efficiency, high luminance, long running life and low efficiency roll-off is realized.

The invention discloses a method for solving the problem of integrated RGB LED afterglow. The method comprises the following steps that any electrode of a red light LED chip is connected with a compensation resistor R1 in series; the compensation resistor R1 is electrically connected with an electrode of the red light LED chip through a metal bonding wire or welding; the compensation resistor R1 enables the total forward voltage drop of the branch circuit where the red light LED chip is located to be increased to be close to the forward voltage drop of the branch circuit where the blue light LED chip or the green light LED chip is located. Packaging the red light LED chip, the blue light LED chip, the green light LED chip and the compensation resistor R1; the invention further discloses an RGB LED device used in the method for solving the problem of the afterglow of the integrated RGB LED. According to the invention, the compensation resistor R1 is built in, so that a user does not need to carry out any external circuit design or calculation, and the compensation resistor R1 can be used while being taken, thereby greatly simplifying the design and production flow of downstream applications and improving the production efficiency.

This display apparatus comprises a liquid crystal panel and a backlight unit which provides light to the liquid crystal panel. The backlight unit comprises: a substrate; a red light-emitting diode provided to be mounted on one surface of the substrate; a green light-emitting diode provided to be mounted on the one surface of the substrate; and a blue light-emitting diode provided to be mounted on the one surface of the substrate. Each of the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode includes at least two cells.

An electronic device including a light emitting display device includes: a first data conductive layer, a second data conductive layer, a green light emitting diode (LED) anode, a red light emitting diode (LED) anode, and a blue light emitting diode (LED) anode positioned on the second organic layer; a pixel definition layer including a green opening overlapping the green light emitting diode (LED) anode, a red opening overlapping the red light emitting diode (LED) anode, and a blue opening overlapping the blue light emitting diode (LED) anode. The first data conductive layer include a first expansion overlapping the red opening or the blue opening of the pixel definition layer, the second data conductive layer includes a second expansion overlapping the green opening of the pixel definition layer, and the second expansion of the second data conductive layer entirely overlaps the green opening of the pixel definition layer.

A liquid crystal display panel for near-eye display comprises a liquid crystal (LC) panel and a backlight unit (BLU). The BLU includes an array of blue light-emitting diodes (LEDs); a light guide plate configured to guide the blue light from the array of blue LEDs through total internal reflection, and couple portions of the blue light guided by the light guide plate out of the light guide plate; a quantum dot film including quantum dots configured to absorb blue light and emit red and green light; a brightness enhancement film configured to transmit incident light within an angular range and reflect incident light outside of the angular range; and an optical efficiency enhancement film configured to modify an angular beam profile of light from the quantum dot film such that the light transmitted by the brightness enhancement film has a peak intensity in a direction perpendicular to the LC panel.

The present disclosure provides a backlight module and a manufacturing method thereof. The backlight module comprises a circuit board and a plurality of light emitting units. The plurality of light emitting units are arranged on the circuit board in a spaced manner and are electrically connected to the circuit board. Each light emitting unit comprises a plurality of light emitting diode chips arranged in a spaced manner and a fluorescent layer covering the plurality of light emitting diode chips. The plurality of light emitting diode chips comprises at least one blue light emitting diode chip and at least one green light emitting diode chip. The number of the blue light emitting diode chips is greater than or equal to the number of the green light emitting diode chips. The fluorescent layer is a red fluorescent layer.

A display apparatus including a circuit board; and a plurality of pixels formed on the circuit board, wherein at least one of a blue light emitting diode chip, a red light emitting diode part, and a green light emitting diode chip is disposed in each of the pixels, and the blue light emitting diode chip, the red light emitting diode part and the green light emitting diode chip are covered by a coupling structure.

A light emitting diode (LED) module that is configured to emit white light is provided. The LED module includes: a blue light emitting diode configured to emit blue light having a first peak wavelength of 420 nm to 465 nm; and a near-infrared wavelength conversion material that is configured to be excited by the blue light to emit additional light having a peak wavelength in a range of 740 nm to 900 nm, and further having a full width at half maximum (FWHM) of 120 nm or less. The near-infrared wavelength conversion material includes Ca(Al12-x-y,Gay)O19:xCr3+ (0≤x≤1, 0≤y≤6).

The application provides a display module, a display system and a scanning method, which can be applied to the technical field of display and can realize the following technical effects: the display module comprises a display module, a row driving module and a column driving module, the display module comprises a plurality of pixel units, each pixel unit comprises a red light-emitting diode, a green light-emitting diode and a blue light-emitting diode, the row driving module and the column driving module are connected to the positive electrode and the negative electrode of each pixel unit respectively, the number of red column drivers is greater than the number of blue column drivers in the column driving module, and the number of red column drivers is greater than the number of green column drivers, so that the number of pixel units connected by the blue column drivers and the green column drivers is greater than the number of pixel units connected by the red column drivers, the control range of the blue column drivers and the green column drivers is expanded, and the utilization rate of the blue column drivers and the green column drivers is promoted.

A multi-RGB integrated high-voltage chip relates to the technical field of display screen equipment and comprises a chip substrate, a first light-emitting component, a second light-emitting component and a third light-emitting component are arranged on the front side of the chip substrate and are connected in parallel, the first light-emitting component is a red light-emitting diode string, and the second light-emitting component is a red light-emitting diode string. The second light-emitting assembly is a green light-emitting diode string, the third light-emitting assembly is a blue light-emitting diode string, a plurality of R, G and B diode units are connected in series in the same color, the number of R tubes is larger than that of G and B tubes, a plurality of RGB diode units are integrated on one light-emitting chip, three-line input and single-line output are achieved, high-voltage power supply and low-current light emitting are achieved, the voltage drop condition is avoided, and the light-emitting efficiency is improved. In addition, the multiple light-emitting units are integrated, and the overall brightness is higher.

The application discloses a packaged light source, a lamp with the packaged light source and a packaging method, wherein the packaged light source comprises: a packaged blue light emitting diode chip, a packaged photoluminescence fluorescent powder and silica gel mixture layer and a pre-modification glue layer which are sequentially superimposed; the packaged blue light emitting diode chip and the packaged photoluminescence fluorescent powder and silica gel mixture layer have a color temperature difference between a color temperature of light generated by the packaged blue light emitting diode chip and the packaged photoluminescence fluorescent powder and silica gel mixture layer and a target color temperature; and the pre-modification glue layer is used for modifying to the target color temperature. When the packaged light source is produced by a packaged light source manufacturer, the color temperature formed by the packaged blue light emitting diode chip and the fluorescent glue layer is set to have a color temperature difference with the target color temperature, and the pre-modification glue layer is modified to be close to the target color temperature. When the packaged light source is filled with transparent glue by a lamp manufacturer, the color temperature of the emitted light will not be deviated or the deviation is very small, so that the color temperature of the light of the lamp terminal is closer to the required color temperature.

The invention discloses a display driving circuit and display screen energy-saving equipment, and relates to the technical field of display equipment, and the circuit comprises a first power supply module which is connected to the anode of a red light-emitting diode in an LED display unit and is used for providing a first working voltage for the red light-emitting diode; the second power supply module is connected with the anode of a green light emitting diode and the anode of a blue light emitting diode in the LED display unit and used for providing second working voltage for the green light emitting diode and the blue light emitting diode, and the first working voltage is smaller than the second working voltage; the driving module is connected with the cathode of the red light-emitting diode, the cathode of the green light-emitting diode and the cathode of the blue light-emitting diode, and is used for providing driving current for the red light-emitting diode, the green light-emitting diode and the blue light-emitting diode. The row selection module is connected with the row selection end of each LED display unit through a plurality of row selection lines, and is used for sequentially gating each LED display unit in a preset scanning period.