16 results about "Electroluminescence spectra" patented technology

The invention provides a luminescent material containing a cyclobutadiene structure, and a preparation method and application thereof, and relates to the technical field of organic electroluminescent materials. According to the cyclobutadiene-containing luminescent material provided by the invention, the anti-aromatic cyclobutadiene is fused into a binary nitrogen-containing fused heterocyclic skeleton, and excitation state vibration relaxation is inhibited by using the special electronic structure and high ring tension of the anti-aromatic cyclobutadiene, so that narrow-band luminescence is realized. By introducing the steric hindrance effect group, the aggregation fluorescence quenching phenomenon between luminescent parent nuclei is weakened, and the fluorescence quantum yield is improved. Different from a current mainstream multi-resonance mechanism, the design of the narrow-spectrum light-emitting molecule provided by the invention does not need to depend on the construction of a B / N-fused ring, and the molecular structure can be simplified to realize full-light-color ultra-narrow-band light emission. When the organic light-emitting diode is applied to an organic light-emitting device, an ultra-narrow full-width-at-half-peak electroluminescent spectrum and high device efficiency can be realized, and a better solution is provided for an ultra-high-definition organic light-emitting diode display technology.

The present invention relates to a Micro-LED micro-display device driving control method and device, comprising the following steps: dividing a target pixel area by a preset display image to obtain sub-pixel blocks; performing electroluminescence spectrum analysis on a target micro-display device based on the sub-pixel blocks to obtain a spectral radiation power distribution; performing chromaticity calculation on the target micro-display device based on the spectral radiation power distribution to obtain chromaticity coordinate data; performing pulse width modulation on the target micro-display device based on the chromaticity coordinate data to obtain a multi-level grayscale driving waveform; using a distributed control architecture to transmit the multi-level grayscale driving waveform to a corresponding target micro-display device to obtain a Micro-LED display image, thereby solving the technical problem of how to efficiently perform electroluminescence spectrum analysis since each pixel point in a Micro-LED array is an independent light source, and adjusting the luminous characteristics of each pixel point accordingly to ensure consistency of image quality.

The invention discloses an air environment preparation method of a perovskite blue light emitting diode. The air environment preparation method comprises the following steps: S1, preparing a hole injection layer on the surface of an ITO anode; s2, preparing an interface modification layer on the upper surface of the hole injection layer to obtain an intermediate substance; s3, preparing a perovskite blue light emitting layer on the interface modification layer to obtain a substrate with a light emitting layer; s4, evaporating an electron injection layer on the surface of the light-emitting layer; and S5, evaporating a cathode on the surface of the electron injection layer. An alkane anti-solvent (isooctane, n-octane and n-hexane) is introduced for treatment in the process of processing a light-emitting layer by a solution, so that the brightness and the electroluminescent external quantum efficiency of the device are improved, and compared with the traditional process of preparing blue light PELEDs in an air environment by adopting diethyl ether as a treatment solvent, the electroluminescent external quantum efficiency of the device is improved by about one time. The electroluminescent spectrum of the perovskite blue light PeLEDs disclosed by the invention can show relatively good stability under the driving of different voltages and time.

The invention relates to a solar cell detection method and a solar cell detection system. The method comprises the following steps: in response to an electroluminescence test instruction, obtaining a first photoluminescence spectrum of a to-be-tested sub-cell; first exciting light is applied to the laminated cell, at least the to-be-tested sub-cell and the associated sub-cell are excited to be in a light-emitting state, and the associated sub-cell and the to-be-tested sub-cell are sequentially and adjacently arranged in the sub-cell current transmission direction corresponding to the test electric signal; applying a first test electric signal to the laminated cell to obtain a test emergent light spectrum of the to-be-tested sub-cell; and determining the electroluminescence spectrum of the to-be-tested sub-cell according to the first photoluminescence spectrum of the to-be-tested sub-cell and the test emergent light spectrum. The laminated cell can be subjected to an electroluminescence test and a photoluminescence test, and the accuracy of the electroluminescence test of the laminated cell is effectively improved.

Provided are a display panel and a display device. In the display panel, first sub-pixels are configured to emit light of a first color, second sub-pixels are configured to emit light of a second color, and third sub-pixels are configured to emit light of a third color. The first sub-pixels, the second sub-pixels, and the third sub-pixels at least satisfy one of the following relationships: relationship I: the difference between the color gamut x-coordinate of the light of the second color and the color gamut x-coordinate of the light of the third color is within the range of ±0.02 of the color gamut y-coordinate of the light of the third color, and the color gamut y-coordinate of the light of the first color is not greater than the color gamut x-coordinate and / or the color gamut y-coordinate of a white point formed by synthesizing the light of the first color, the light of the second color, and the light of the third color; and relationship II: the difference between the maximum value and the minimum value of the half-peak widths of the electroluminescence spectra of the first sub-pixels, the second sub-pixels, and the third sub-pixels is less than or equal to 11 nm, and the difference between the half-peak widths of the electroluminescence spectrum and photoluminescence spectrum of each sub-pixel is less than or equal to 16 nm.

The invention provides a display panel and a display device. In the display panel, a first sub-pixel is configured to emit a first color light, a second sub-pixel is configured to emit a second color light, and a third sub-pixel is configured to emit a third color light. The first sub-pixel, the second sub-pixel and the third sub-pixel at least meet one of the following relations: relation 1: the difference value of the color gamut abscissa of the second color light and the color gamut abscissa of the third color light is within the range of + / -0.02 of the color gamut ordinate of the third color light; the color gamut ordinate of the first color light is not greater than the color gamut abscissa and / or the color gamut ordinate of a white point synthesized by the first color light, the second color light and the third color light; the second relation is that the difference value of the maximum value and the minimum value of the half-peak width of the electroluminescence spectrum of the first sub-pixel, the second sub-pixel and the third sub-pixel is smaller than or equal to 11 nm, and the difference value of the half-peak width of the electroluminescence spectrum and the half-peak width of the photoluminescence spectrum of each sub-pixel is smaller than or equal to 16 nm.

The application relates to a solar cell detection method and a solar cell detection system. The method comprises the following steps: in response to an electroluminescence test instruction, acquiring a first photoluminescence spectrum of a to-be-detected sub-cell; applying first excitation light to a laminated cell, so that the to-be-detected sub-cell and an associated sub-cell are in a luminescent state, wherein the associated sub-cell and the to-be-detected sub-cell are arranged in sequence along a sub-cell current transmission direction corresponding to a test electric signal; applying a first test electric signal to the laminated cell; acquiring a test light-out spectrum of the to-be-detected sub-cell; and determining an electroluminescence spectrum of the to-be-detected sub-cell according to the first photoluminescence spectrum and the test light-out spectrum of the to-be-detected sub-cell. The application can perform electroluminescence testing and photoluminescence testing on the laminated cell, and effectively improves the accuracy of electroluminescence testing of the laminated cell.

The application provides a luminescent material containing a cyclobutadiene structure, a preparation method and application, and relates to the technical field of organic electroluminescent materials.The luminescent material containing a cyclobutadiene provided by the application is fused to a binary nitrogen-containing fused heterocyclic skeleton by using anti-aromatic cyclobutadiene, the anti-aromatic special electronic structure and high ring tension of the anti-aromatic cyclobutadiene are utilized to inhibit excited state vibration relaxation and realize narrow-band luminescence.By introducing a steric hindrance effect group, the aggregation-induced fluorescence quenching phenomenon between luminescent mother nuclei is weakened, and the fluorescence quantum yield is improved.Different from the current mainstream multiple resonance mechanism, the narrow-spectrum luminescent molecule design provided by the application does not need to depend on the construction of B / N-hetero-fused rings, and the molecular structure can be simplified to realize full-color super-narrow-band luminescence.The application is applied to an organic electroluminescent device, and can realize an electroluminescent spectrum with a super-narrow full width at half maximum and high device efficiency, and provides a better solution for super-high-definition organic light-emitting diode display technology.

The present invention relates to a blue light all-inorganic perovskite light-emitting diode and a preparation method thereof, and relates to the technical field of light-emitting diodes. The present invention solves the technical problem that in the preparation method of the blue light perovskite light-emitting diode in the prior art, inorganic or organic substances need to be doped in the perovskite light-emitting layer to realize blue light. The present invention adopts nickel oxide and mercaptic acid compounds as the anode interface layer and the anode interface modification layer respectively to effectively adjust the crystallization performance and bandgap width of the perovskite film, realizes the effective regulation of the electroluminescence spectrum of the perovskite light-emitting device from green light to blue light, and finally obtains a blue light emitting electroluminescent device based on the all-inorganic perovskite material system.

The invention provides a boron-nitrogen compound and application thereof, the boron-nitrogen compound has a structure as shown in a formula I and a formula II, the boron-nitrogen compound not only realizes fine adjustment of a spectrum, but also further improves luminous efficiency through extension conjugation and introduction of nitrogen atoms. The boron-nitrogen compound provided by the invention has a narrow spectrum and is used as a narrow-spectrum luminescent material for preparing a luminescent layer of an organic electroluminescent device, the organic electroluminescent device prepared from the boron-nitrogen compound realizes narrow-spectrum thermal activation delayed fluorescence (TADF) emission, the electroluminescent spectrum is in a green light-yellow light region, the half-peak width is less than 45nm, and the boron-nitrogen compound has a wide application prospect. And the highest external quantum efficiency of electroluminescence of the device reaches up to 30% or above.

The application discloses an automatic evaluation system for performance loss caused by defects of a solar cell, wherein an input module is used to read electroluminescence spectra, external quantum efficiency and a group of electroluminescence images collected under different forward injection current densities of the solar cell; a cell edge detection module is used to determine the accurate position of the solar cell in the electroluminescence images; a cell defect recovery module is used to identify defect areas on the surface of the solar cell, calculate the predicted luminescence intensity of each defect area and recover the defects; a cell volt-ampere characteristic calculation module is used to obtain actual or predicted volt-ampere characteristic curves of the solar cell according to the relationship between actual or predicted electroluminescence intensity and the internal voltage of the cell; and a cell performance loss evaluation module is used to obtain actual or predicted performance parameters of the cell according to the actual or predicted volt-ampere characteristic curves, compare the actual or predicted performance parameters, and quantitatively evaluate the performance loss of the solar cell caused by the defects.

The invention provides a method for improving spectrum heat resistance of perovskite nanocrystals and photoelectric devices thereof through anion post-treatment, and belongs to the technical field of semiconductor nanomaterials and photoelectric devices. According to the method, an organic group-anion compound is used for carrying out solution post-treatment on the perovskite nanocrystal, and the thermal excitation formation energy of the defect is remarkably improved through the vacancy defect that anions occupy the surface of the nanocrystal, so that the thermally induced fluorescence quenching phenomenon is effectively inhibited. The processed perovskite nanocrystal can maintain excellent fluorescence intensity under a heating condition, and a photoelectric device assembled by using the perovskite nanocrystal as a luminescent layer also shows significantly improved electroluminescent spectrum stability in a high-temperature working environment. The method is simple in process and suitable for various perovskite material systems and device structures, and an effective scheme is provided for solving the thermal stability problem of the perovskite material.

The invention relates to an LED chip life prediction method and related equipment, and the method comprises the following steps: carrying out the electroluminescent spectrum measurement of an LED chip, and obtaining an initial spectrum characteristic curve of the LED chip; performing Gaussian peak decomposition on the initial spectral characteristic curve to obtain multi-peak spectral parameters of the LED chip; performing spectrum evolution simulation on the LED chip through a spectrum reconstruction technology based on the multi-peak spectrum parameters to obtain a spectrum change trend chart of the LED chip; performing spectral feature extraction based on the spectral change trend chart to obtain a spectral attenuation feature vector of the LED chip; the technical problems that in the prior art, the service life of the LED chip is evaluated generally by combining an accelerated aging experiment with an empirical model, however, the method is long in period, high in cost and difficult to reflect the performance degradation process under the actual working condition in the prior art are solved in the prior art, the service life of the LED chip is predicted and analyzed on the basis of the spectral attenuation feature vector, and the service life prediction result of the LED chip is obtained.

This invention discloses a method for preparing a blue light-emitting thin film, the blue light-emitting thin film, and a light-emitting device. The method involves dissolving a mixture of cesium bromide, lead bromide, lead chloride, and an organic ligand in dimethyl sulfoxide solvent to obtain a precursor solution. An additional ligand is added to the precursor solution to obtain a perovskite precursor solution. An additive is added to the perovskite precursor solution, and the mixture is stirred for a predetermined first time to obtain a homogeneous solution. The homogeneous solution is then spin-coated in a nitrogen-filled glove box, with an antisolvent added during the spin-coating process to obtain a raw thin film. The raw thin film is annealed and then vacuum-dried to obtain a blue light-emitting perovskite thin film. The above method uses amine salts as organic ligands and small-molecule amine salts as additional ligands, ultimately resulting in a significant improvement in the photoluminescence quantum efficiency, maximum external quantum efficiency, and maximum power efficiency of the prepared blue light-emitting perovskite thin film, as well as achieving high maximum brightness and a stable electroluminescence spectrum.

A light emitting diode according to an exemplary embodiment of the present disclosure includes: a first conductivity type nitride semiconductor layer; a V-pit generation layer disposed on the n-type nitride semiconductor layer and having a V-pit; a lower active layer disposed on the V-pit generation layer; an upper active layer disposed on the lower active layer; an intermediate layer disposed between the lower active layer and the upper active layer; a second conductivity type nitride semiconductor layer disposed on the upper active layer, an upper step coverage layer disposed between the second conductivity type semiconductor layer and the upper active layer; and a lower step coverage layer disposed between the intermediate layer and the lower active layer, in which in an electroluminescence spectrum, the light emitting diode emits light having a highest peak intensity in a wavelength range of 500 nm or more in a visible light region.

A light-emitting device includes a first light-emitting layer and a second light-emitting layer that are stacked. A material of the first light-emitting layer includes a first host material and a first TADF sensitizer. A material of the second light-emitting layer includes a second host material, a second TADF sensitizer, and a second fluorescent emissive material. Transmission rates of the material of the first light-emitting layer and the material of the second light-emitting layer to holes are greater than transmission rates of the material of the first light-emitting layer and the material of the second light-emitting layer to electrons, and there is a first overlapping region between a normalized electroluminescence spectrum of the first TADF sensitizer and a normalized absorption spectrum of the second fluorescent emissive material.