20 results about "Luminescence quantum yield" patented technology

The application discloses a monolithic integrated self-powered luminescent solar concentrator-electrochromic integrated device and a preparation method thereof, and has a layered structure, which is, from bottom to top, a conductive glass substrate, an electrochromic layer, a transparent sealing tape, a fluorescent gel electrolyte layer, a transparent sealing tape, an electrochromic layer and a conductive glass substrate. The monolithic integrated self-powered luminescent solar concentrator-electrochromic integrated device can realize reversible conversion between bleached state and colored state within 100 seconds under natural sunlight, and realize dynamic adjustment of the transmittance of incident sunlight. The core functional layer of the device is a fluorescent gel electrolyte with high luminescent efficiency, and the photoluminescence quantum yield can reach 74.9%, so that the device has excellent light capturing and photon transmission performance, and can realize high-efficiency photoelectric conversion by coupling a solar cell at the edge of the device to provide power for the reversible driving of the electrochromic device. The application realizes self-powered electrochromism which can be applied to building glass curtain walls.

The invention belongs to the technical field of hydrogen bond organic framework materials, and relates to a chiral luminescent ionic hydrogen bond organic framework material, the chemical formula is [(H2CBS) 4 (R / S-DPEN) 4. (EtOH) 2 (H2O) 18] n, n is a positive integer, H2CBS is 4, 4 '-bis (2-sulfostyryl) biphenyl, and R / S-DPEN is R / S-diphenylethylenediamine. The structural unit belongs to a triclinic system, the space group is P1, and the molecular formula is C177H222N8O50S8. The preparation method comprises the following steps: dissolving an H2CBS ligand and an R / S-DPEN ligand in a mixed solution of water and ethanol to obtain a reaction solution; and carrying out sealed heat preservation on the reaction liquid at 5-8 DEG C to obtain colorless transparent rod-like crystals, filtering and drying to obtain the chiral luminous ionic hydrogen bond organic framework material. The material has high light-emitting quantum yield and good structural stability and reversibility, and has important application value in the fields of organic light-emitting diodes (OLEDs), biological imaging, photoelectric devices and the like.

The invention relates to the technical field of metal halide luminescent materials, and discloses a preparation method of a cesium-lead-bromine-chlorine blue-light quantum dot colloid and a preparation method of a blue-light film. The method comprises the following steps: dissolving cesium bromide and lead bromide in N, N-dimethylformamide, adding oleic acid and oleylamine to form a precursor solution, and injecting the precursor solution into a toluene anti-solvent to prepare CsPbBr3 quantum dot colloid; and then dropwise adding a toluene saturated solution of alkaline earth metal chloride (calcium chloride, strontium chloride, barium chloride or magnesium chloride) for post-treatment to realize ion exchange of Cl <-> and Br <-> and synergistic defect passivation, so that the emission peak is continuously adjustable in the range of 450-500 nm, the half-peak width is less than 30 nm, and the photoluminescence quantum yield is greater than 60%. And further mixing the quantum dot colloid with a polymethyl methacrylate toluene solution and forming a film to obtain a stable blue light quantum dot film which can be used for a backlight source or a display device.

The invention is applicable to the technical field of chemical materials, and provides a method for regulating and controlling luminescence of Au nanoclusters by solvent-induced ligand isomerization, which comprises the following steps: firstly, synthesizing the gold nanoclusters with different surface isomer proportions by regulating the pH value of a reaction system; au (I)-thioketone and Au (I)-mercaptan isomer are induced to be reversibly converted by utilizing the interaction of solvent molecules and a cluster surface ligand structure, and proton coupling electron transfer kinetics is cooperatively regulated, so that the precise regulation of the luminescence property of the gold nanocluster is realized. According to the present invention, the wide band and the continuous reversible adjustment of the light-emitting wavelength in the range of 495-800 nm can be achieved under the mild condition, the light-emitting quantum yield can be significantly improved, and the method has advantages of simple operation, clear mechanism, greenness and universality, and has application prospects in the fields of biological imaging, optical sensing, light-emitting devices and the like.

The invention belongs to the technical field of nano material preparation and printing, and particularly relates to indium phosphide quantum dot ink as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, the indium phosphide quantum dot core is firstly synthesized, and then the acrylic acid / polyacrylic acid / acrylate derivative ligand is used for carrying out surface treatment on the indium phosphide quantum dot, so that the surface passivation and stability improvement of the indium phosphide quantum dot and the optimization of the rheological property of the ink are synchronously realized, and the quantum efficiency is improved; the photoluminescence quantum yield is increased by 80% to 100% compared with that of similar InP / ZnSe quantum dots which are not treated by acrylic acid and the like. Indium phosphide / zinc selenide quantum dots treated by acrylic acid and the like are dispersed in an organic solvent to adjust the adaptive concentration to obtain the quantum dot ink, the ink does not need to be added with an additional rheology modifier or a film-forming polymer, the coffee ring effect can be effectively inhibited during drying, and preparation of high-resolution micro-patterns is achieved. The material can be directly used as a color conversion layer to be integrated with a blue micron light-emitting diode chip to form a display device.

Provided is a Sn / Ge halide nanocrystal represented by general formula (1): Cs3(Snα1Ge(1-α1))(Brβ1I(1-β1))5, wherein α1 is 0.00-0.40 and β1 is 0.00-1.00. According to the present invention, it is possible to provide a novel lead-free halide nanocrystal and lead-free halide nanocrystal composite having a high photoluminescence quantum yield and exhibiting a peak of emission from red to near infrared wavelengths.

The application belongs to the cross field of coordination chemistry and nanomaterials, and discloses a super-stable strong luminescent N-heterocyclic carbene-protected chiral heterometallic cluster and a preparation method thereof. 58.5 H 59 AuBr4ClCu4F6N8OP (abbreviated as: R / S -NHC py -AuCu4 ‑ Br) belongs to an orthorhombic system, and the space group is a chiral space group P 212121. Another chemical formula of the nanocluster is C 58 H 58 AuCu4F6I4N8P (abbreviated as: R / S -NHC py -AuCu4 ‑ I) belongs to an orthorhombic system, and the space group is a chiral space group I 41. The cluster has a structure that can be stable to 150 DEG C in air. R / S -NHC py -AuCu4 ‑ Br has strong orange luminescence at room temperature in air, and the luminescence quantum yield is 58%. The chiral structure and strong luminescence make it have strong chiral luminescence characteristics, and it can have good application prospects in the fields of holographic projection, information storage and cell imaging.

A light-emitting element with high luminous efficiency is provided. The light-emitting element contains a first organic compound and a second organic compound. The first and second organic compounds form an exciplex. The first organic compound emits no fluorescence but phosphorescence at a temperature ranging from low temperature to normal temperature. The luminescence quantum yield of the first organic compound is higher than or equal to 0% and lower than or equal to 40% at room temperature. Light emitted from the light-emitting element includes light emitted from an exciplex formed by the first organic compound and the second organic compound.

This invention relates to a class of dihydroxanthine chemiluminescent groups, their preparation methods, and applications. The dihydroxanthine chemiluminescent group developed in this invention, compared to the traditional phenolic dioxane chemiluminescent group which uses two rigid six-membered rings to fix the double bond conformation, exhibits a higher luminescence quantum yield and a longer emission wavelength. More importantly, it possesses a reactive aldehyde group, which, while maintaining high rigidity, extends the π-electron conjugated system, causing its emission wavelength to redshift to the near-infrared region. This allows it to be extended to chemiluminescence detection and in vivo imaging in small animal models.

The application provides a white light phosphor powder based on copper-iodine organic hybrid clusters and a preparation method thereof, and has a structure shown in formula I. The structure of the white light phosphor powder in the application is that Cu4I4 is used as an inorganic core, and copper atoms are coordinated with nitrogen and phosphorus atoms on ligands to form a stable and unique cluster structure. The light emitting mechanism of the cluster is charge transfer from the inorganic core to the ligand, and the simple core and the ligand cooperate with each other to form degenerate emission energy levels, so that white light emission with double wide peaks from 400 to 800 nm is realized. The light emitting quantum yield reaches 97.8%. The material also exhibits excellent stability, and the thermal decomposition temperature is as high as 265 DEG C. The material also has low thermal quenching, and still maintains more than 80% of the original light emitting quantum yield under the condition of 240 DEG C. The application also provides an application of the white light phosphor powder based on copper-iodine organic hybrid clusters. The white light phosphor powder is applied to the field of solid state lighting, and has significant advantages and application prospects.

This invention discloses a multilayer nonlinear scalable optical neural network computing system based on 2D / 3D composite perovskite thin films, including a light source module, an optical convolution module, a nonlinear activation module, a photodetector module, and an electrical computing module. The nonlinear activation module utilizes 2D / 3D perovskite thin films formed from PEABr, CsBr, and PbBr₂, further cascaded to achieve high photoluminescence quantum yield and excellent film quality. It can efficiently convert the optical signal passing through the optical convolution module and achieve nonlinear activation. This invention employs an end-to-end joint optimization strategy to train optical masks combined with corresponding electrical back-ends to perform general visual processing tasks, including but not limited to image denoising and image classification. It can achieve high-precision image denoising and classification in a passive, lens-free manner, improving the computational depth and feature extraction capabilities of the photonic neural network.

The application discloses a kind of solid-state luminescent Schiff base two-dimensional covalent organic framework material and its preparation method and application, belong to material field.The preparation method of the solid-state luminescent Schiff base two-dimensional covalent organic framework material of the present application includes the following steps: the amine with C2 symmetry, DAD, solvent and acetic acid aqueous solution are mixed, and solvent thermal reaction is carried out, to obtain the solid-state luminescent Schiff base two-dimensional covalent organic framework material;The solvent is o-dichlorobenzene and n-butanol.The COFs material prepared in the application has high crystallinity and porosity, and the solid-state absolute luminescence quantum yield is as high as 39%.

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 silicon nanodot, a high-performance super-long continuous light-emitting silicon nanodot composite material, a preparation method of the composite material and an application of the composite material in information encryption, and develops an economical, simple, convenient and innovative strategy, the silicon nanodot is integrated into a composite matrix, and the composite material is prepared. And the high photoluminescence quantum yield of the SiNDs is effectively combined with the stability of a substrate to triplet excitons. The phosphorescence quantum yield (PhQY) of the obtained material is up to 81.04%, the afterglow life is as long as 3.44 seconds, meanwhile, macroscopic cyan emission is accompanied, the duration time is up to 52 seconds, and the material is one of reported long-afterglow luminescent systems with the best performance. The high-performance multicolor long afterglow material is obtained with lower manufacturing cost and a simpler technological process, the problems that an existing afterglow material is low in phosphorescence quantum yield, single in function, potential in pollution and the like are effectively solved, and a new solution is provided for the field of information encryption and the like.

This invention belongs to the interdisciplinary field of coordination chemistry and nanomaterials, and discloses an ultrastable, strongly luminescent N-heterocyclic carbene-protected chiral heterometallic cluster and its preparation method. This invention utilizes multidentate chiral... R / S -NHC ql A well-designed and modular construction strategy using the -PF6 ligand resulted in a highly stable chiral heterometallic cluster, which remains stable in air up to 200°C. The chemical formula of this enantiomeric cluster is: C 74 H 66 AuCu4F6I4N8OP (abbreviated as: R / S -NHC ql -AuCu4 ‑ I), belongs to the orthorhombic crystal system, and its space group is chiral space group. P 21212. This cluster exhibits strong orange luminescence at room temperature with a luminescence quantum yield as high as 93%. It possesses advantages such as ultra-high photoluminescence quantum yield with thermally activated delayed luminescence characteristics, microsecond lifetime at room temperature, circularly polarized luminescence, and good solubility, radiation resistance, and high-temperature resistance. The external quantum efficiency of the CP-OLED prepared by solution processing reaches as high as 20.8%, opening up new avenues for developing novel solution-processable cluster-based CP-OLEDs.

The invention discloses a preparation method of sandwich structure quantum dots, and belongs to the field of photoelectric materials and devices. A special reaction container is adopted to prepare a precursor solution, and sandwich structure quantum dots are obtained after a reaction system is formed; the quantum dot has a core-shell-shell structure of a metal oxide core, a perovskite CsPbX3 central layer and a metal oxide shell. A metal oxide is introduced into a precursor to serve as a structure-directing agent, epitaxial growth is induced, and surface defects are passivated; the photoluminescence quantum yield of the obtained quantum dots reaches up to 95%, and the emission wavelength is continuously adjusted to 690 nm (dark red light) from 518 nm (green light). In severe environments such as high temperature, water immersion and ultraviolet radiation, the luminous intensity retention rate exceeds 70%, and the stability is excellent. The full-perovskite white light LED device prepared from the material has the color gamut coverage of 134.34% NTSC and 100.47% Rec. 2020, and has huge application potential in the fields of wide color gamut display and efficient illumination. The method is simple and convenient in process, good in repeatability and good in environmental stability, and provides an effective path for improving the performance of the perovskite quantum dots.

The application belongs to the technical field of luminescent materials, and discloses a photochemical long-afterglow system, a preparation method and application thereof.The photochemical long-afterglow system mainly comprises a photosensitizer, a light energy storage unit and an emitter which are tightly combined through coordination.The working principle is that the photosensitizer generates singlet oxygen under the irradiation of excitation light, the singlet oxygen reacts with the light energy storage unit to generate an epoxy structure intermediate, the excited state photooxidation product is generated after chemical excitation, and the energy is transferred to the emitter, the emitter releases photons, and then the afterglow light is realized.The construction idea of the system greatly widens the selection range of the intermediate and the emitter in the photochemical long-afterglow system, and provides a new idea for improving the luminescent quantum yield and luminous brightness of the photochemical long-afterglow.

The application discloses a kind of hyperbranched plasticizer, preparation method and its application, belong to organic functional material technical field.The hyperbranched plasticizer is with polyamine or polyol as core skeleton, graft multiple long-chain alkyl through branched unit, form with multiple alkyl chain modification hyperbranched structure, its synthesis process is simple, need not noble metal catalyst, and with luminescent material (such as TADF polymer), excellent compatibility of elastic matrix.The hyperbranched plasticizer is applied to stretchable luminescent film, can significantly improve the flexibility and tensile property (elongation at break ≥200%) of film, simultaneously without affecting the exciton utilization efficiency of luminescent material, effectively inhibits exciton quenching, makes film keep high luminescent quantum yield.The hyperbranched plasticizer of the application provides key material support for the scale preparation of stretchable OLED, flexible light-emitting device, has wide application prospect in flexible display, wearable electronics and other fields.

This invention discloses a luminol-imidazolium derivative and its preparation method. The compound (LH2)2-ImH, named 1,3-bis(3-acetamido-phthalamide hydrazide)-imidazolium chloride, was synthesized through a two-step reaction. Chemiluminescence performance studies show that the luminescence quantum yield of (LH2)2-ImH is approximately 3.5 times that of LH2, and its luminescence efficiency at pH=8 is also higher than that of LH2 at pH=10. This effectively improves the sensitivity of chemiluminescence analysis and expands the detection concentration range. Furthermore, the glow discharge chemiluminescent hydrogel system prepared with (LH2)2-ImH achieves long-term naked-eye visible chemiluminescence. Detection of H2O2 and other substances can be achieved simply by taking photos of the luminescence change over time with a smartphone, simplifying the operation and reducing detection costs.

The invention discloses an efficient luminous high-entropy Cs2 (CuAgAuInTl) I3 perovskite scintillator material as well as a preparation method and application thereof, and belongs to the technical field of scintillator materials and radiation detection. The chemical general formula of the material is Cs2 (CuxAgyAuzInwTlv) I3 (x + y + z + w + v = 1, and the molar fraction of each element is 0.15-0.25), the material is of a cubic phase perovskite structure, the lattice constant is 6.25-6.35, the excitation wavelength is 280-350 nm, the emission wavelength is 420-480 nm, and the photoluminescence quantum yield is larger than or equal to 85%. The preparation method comprises the steps of raw material pretreatment, weighing and mixing, vacuum hot pressed sintering and surface polishing, and the crystal quality is ensured through two-stage heating sintering. The material is lead-free and environment-friendly, the thermal decomposition temperature is greater than or equal to 500 DEG C, and the luminous efficiency retention rate is greater than or equal to 90% after the material is placed for 30 days under 60% humidity; the X-ray luminous efficiency is greater than or equal to 65000 photons / MeV, the gamma ray energy resolution is less than or equal to 8.5%, and the decay time is less than or equal to 50 ns. The detector can be packaged with a photoelectric conversion device to form a detector, and is used in the fields of medical diagnosis, safety inspection and the like.