266results about How to "Improve luminescence stability" patented technology

The invention discloses a nitride luminescent device and a production method thereof, which relate to a semiconductor luminescent device and provide a nitride luminescent device with an asymmetric coupled multi-quantum well structure being the active area. The device at least comprises an n-type electron injection layer, a p-type hole injection layer and a multi-quantum well active layer which is sandwiched between the n-type electron injection layer and the p-type hole injection layer, and the active layer is composed of asymmetric coupled quantum well structures. The barrier layer of the quantum well is thinner, thus being easy to realize the tunneling of current carriers; transition energy between ground-state energy level in the quantum wells is gradually changed; the quantum wells with high transition energy are close to the p-type hole injection layer; and the quantum wells with low transition energy are close to the n-type electron injection layer. The active area structure can enhance the tunneling transportation of the holes in the quantum well active area, simultaneously block the tunneling transportation of electrons in the quantum well active area, improve the uneven distribution of current carriers in the active area of the nitride luminescent device, reduce electron leakage and energy band filling effect, and realize high-efficiency luminescence.

The present invention provides methods, compositions, substrates, and kits useful for analyzing the metabolic activity in cells, tissue, and animals and for screening test compounds for their effect on cytochrome P450 activity. In particular, a one-step and two-step methods using luminogenic molecules, e.g. luciferin or coelenterazines, that are cytochrome P450 substrates and that are also bioluminescent enzyme, e.g., luciferase, pro-substrates are provided. Upon addition of the luciferin derivative or other luminogenic molecule into a P450 reaction, the P450 enzyme metabolizes the molecule into a bioluminescent enzyme substrate, e.g., luciferin and / or luciferin derivative metabolite, in a P450 reaction. The resulting metabolite(s) serves as a substrate of the bioluminescent enzyme, e.g., luciferase, in a second light-generating reaction. Luminescent cytochrome P450 assays with low background signals and high sensitivity are disclosed and isoform selectivity is demonstrated. The present invention also provides an improved method for performing luciferase reactions which employs added pyrophosphatase to remove inorganic pyrophosphate, a luciferase inhibitor which may be present in the reaction mixture as a contaminant or may be generated during the reaction. The present method further provides a method for stabilizing and prolonging the luminescent signal in a luciferase-based assay using luciferase stabilizing agents such as reversible luciferase inhibitors.

The invention provides a thermally-induced delayed fluorescence material and a preparation method of an organic electroluminescent device. The preparation method includes: using 1, 10 phenanthroline which is rigid as a strong-pull electron centronucleus and a diphenylamine derivative with high electron donating capability as a peripheral connecting group to form a D-A-D strong charge transfer state compound, wherein R1, R2 R3, R4, R5, R6, R7 and R8 are one of aromatic diphenylamine derivatives. The thermal activation delayed fluorescence material is simple to prepare and suitable for wide application. An organic compound obtained by the material can serve as a luminous layer material in OLEDs, and luminous efficiency and stability of the electroluminescent device can be improved by doping proper main materials.

The invention relates to a quantum-dot optical film and a backlight module. A quantum dot core layer, an upper water-proof oxygen-insulation encapsulation layer and a lower water-proof oxygen-insulation encapsulation layer are included. The quantum dot core layer comprises, by weight, 80-110 parts of a matrix adhesive, 6-44 parts of a quantum dot microcapsule and 1-15 parts of a diffusion particle. Luminescence efficiency and stability of the quantum-dot optical film are good. A test is performed under high temperature and high humidity conditions. Brightness and color gamut attenuation are low and small.

The invention discloses a drive circuit of a laser source of a laser projector, which comprises an input interface, a first drive generation circuit, a second drive generation circuit and an output interface, wherein the first drive generation circuit and the second drive generation circuit are two parallel drive generation circuits and are symmetrically distributed between the input interface and the output interface; and the two parallel drive generation circuits are integrated together and connected with an external power supply system through the input interface, and output a transformed voltage through the output interface. The invention satisfies the electric demands for the laser source of the laser projector, greatly reduces the volume of the drive circuit board, implements control on the power of the laser device, and has the function of current control for accurately controlling the emergent light ratio.

The invention discloses a diffuse reflection material, a diffuse reflection layer, a wavelength conversion apparatus and a light source system. The diffuse reflection material includes white scattering particles and an adhesive. The white degree of the white scattering particles is higher than 85. The white scattering particles include high-reflective scattering particles being higher than 90 in white degree, high-refractive scattering particles being not less than 2.0 in refractive index, and high-heat-conductive scattering particles being boron nitride and / or aluminum nitride particles in the shapes of pieces, rods, boards, flat pieces or bars. With the scattering particles being higher than 85 in the white degree and through the high-reflective effect of the high-reflective scattering particles, the thinning effect of the high-refractive scattering particles, and the heat conduction enhancing effect of the high-heat-conductive scattering particles, high reflectivity and the reduction of the thickness of the diffuse reflection layer are synergistically achieved, so that the wavelength conversion apparatus has both high photo-efficiency and high thermal stability, and further is improved in luminescence stability with excitation of high power laser.

The invention belongs to the field of rare-earth functional materials, and particularly relates to a rare-earth / L type zeolite luminescent material and a preparation method thereof. The material consists of L type zeolite, rare-earth ion (Ln) and bismuth ion, wherein 0.0025 to 0.25mmol of the rare-earth ion and 100mg of zeolite are added, and the mole ratio of the rare-earth ion to the bismuth ion is (1 to 250):(40 to 1). The rare-earth ion (Ln) is Nd3<+>, Sm3<+>, Eu3<+>, Tb3<+>, Ho3<+>, Er3<+>, Yb3<+>, Tm3<+> or Dy3<+>. According to the preparation method, the luminous intensity and the stability of the rare-earth / L type zeolite are enhanced through simple ion exchange and baking processes, and the fluorescence lifetime is greatly improved compared with that of other rare-earth doped zeolite. For example, the excited state lifetime of the L type zeolite luminescent material doped with Eu3<+> is above 1.60ms, the stability is very strong at a high temperature, and remarkably dazzling characteristic glow can be emitted under the ultraviolet irradiation. Based on the characteristics, the rare-earth / L type zeolite luminescent material has strong application values in the aspects of plasma display, illumination, falsification prevention and the like.

The invention relates to a preparation method of a cesium-lead halogen perovskite nanocrystalline film with high luminous efficiency. The method comprises the steps of (1) uniformly mixing DMF, oleicacid and oleylamine to obtain a mixed solution; (2) sequentially adding CsX and PbY2 into the mixed solution, uniformly stirring, standing, and taking a supernatant to obtain a precursor solution; (3)uniformly mixing 3-aminopropyltriethoxysilane with DMF to obtain an APTES solution; (4) uniformly mixing the precursor solution and the APTES solution, and adding toluene to obtain a cesium-lead halogen perovskite quantum dot solution; and (5) sequentially cleaning and drying the thin film substrate, respectively putting the thin film substrate into the cesium-lead halogen perovskite quantum dotsolution, centrifuging in a centrifugal machine, pouring out the solution, taking out the substrate, and drying to obtain the cesium-lead halogen perovskite nanocrystalline film with high luminous efficiency. Compared with the prior art, the method has the advantages of simple manufacturing process, good stability, easiness in large-area preparation and the like.

The invention discloses an organic electroluminescent element, which contains electron buffer layer in the organic functional layer between cavity transmitting layer and luminous layer; the electronic buffer layer possesses higher lowest molecular occupying track and maximum molecular occupying track near the cavity transmitting layer material, which is made of the material to transmit cavity and also buffer partial electron with white color under low pressure and higher color stability.

The invention belongs to the luminescence and display technical field, in particular to a novel red rare earth luminescent material for transferring white light by a violet LED. The structural formula of the novel red rare earth luminescent material is M.N1-a-b(MoO4)2-x(SiO4)x:Ra.Rb, wherein M refers to alkali metal Li element or K element or alkali metal Li and Ba element or K and Ba element; N1-a-b refers to alkali metal Na element; and quantitive latent solvent is added. The materials of the compositions of the M.N1-a-b (MoO4) 2-x (SiO4) x: Ra.Rb are weighed by weight percent; the weighed materials are fully grinded and uniformly mixed and then added into an alumina crucible which is covered and placed into a high-temperature furnace and sintered in the air; after the mixture is cooled, the mixture is taken out and crushed and then added into the alumina crucible which is then covered and placed into the high-temperature furnace and sintered in the air; and the mixture is cooled, taken out and grinded, and then the red crystal powder which gives out red light within 365 nanometers under excitation of the violet LED is obtained.

The invention provides a luminescent material and a preparation method thereof and an organic light emitting diode using the same. The luminescent material provided by the invention has a single structure, determined molecular weight, relatively good solubility and film forming property while the film form is stable; and with very high decomposition temperature and relatively low sublimation temperature, the luminescent material can be easily sublimated into a high-purity luminescent material and can be applied to a small-molecule organic light emitting diode. In the preparation method of the luminescent material provided by the invention, p-bromophenol and 2-fluoro-4-bromobenzonitrile are used as start raw materials, an intermediate of the luminescent material is obtained through a series of simple reactions, and finally, the luminescent material is obtained through Ullman reaction or Suzuki reaction; and the steps are simple, and the yield is high. In the organic light emitting diode provided by the invention, a luminescent layer contains the luminescent material and has relatively high luminescent efficiency and stability.

A diffuse reflection material, a diffuse reflection layer, a wavelength conversion device, and a light source system are disclosed. The diffuse reflection material includes white scattering particles and an adhesive agent, where the whiteness of the white scattering particles is greater than 85, and the white scattering particles contain high reflection scattering particles with a whiteness of greater than 90, high refraction scattering particles with a refractive index of greater than or equal to 2.0, and high thermal conductivity scattering particles, where the high thermal conductivity scattering particles are boron nitrite and / or aluminum nitride particles, and the particle shape of the high thermal conductivity scattering particles is rod-like or flat. The reduction in the thickness of the diffuse reflection layer is realized while keeping a high reflectivity, thus causing the wavelength conversion device to have both a high light efficiency and high heat stability.