6results about How to "Reduce half peak width" patented technology

The invention provides a surface-modified perovskite nanocrystal and a preparation method and application thereof, and the surface-modified perovskite nanocrystal comprises: a perovskite nanocrystal having a chemical composition of ABX3; wherein A is selected from at least one of Cs < + >, CH3NH3 < + > and HC (NH2) 2 < + >; b is selected from at least one of Pb < 2 + >, Sn < 2 + >, Ge < 2 + > and Mn < 2 + >; x is selected from halogen anions; the surface of the perovskite nanocrystal is coated with an organic ligand layer; the organic ligand comprises a halogenated organic ligand. In the surface modified perovskite nanocrystal, the surface of the perovskite nanocrystal is coated with the organic ligand layer, so that surface defects can be effectively passivated at the same time, and the surface integrity and the crystallization quality of the nanocrystal are remarkably improved. And due to the surface consistency, the defect state density is reduced, and the exciton and phonon coupling coefficient is reduced, so that a non-radiative composite channel is remarkably inhibited, and the optical performance of the perovskite nanocrystal is remarkably improved.

The invention discloses a method for preparing red light indium phosphide nanocrystals, including the preparation of nanocrystal cores, the preparation of nanocrystal cores including the formation process of seed crystals and the growth process of seed crystals; wherein, the step of adding mixed amines is included in the growth process of seed crystals. The red light indium phosphide nanocrystals of the invention are added with mixed amines during the growth process of seed crystals, and the addition of mixed amines can passivate the surface of seed crystals, so that the indium source and phosphorus source added dropwise during the growth process of seed crystals will directly grow on the passivated seed crystal surface without forming new seed crystals, and the particle size distribution of the obtained indium phosphide nanocrystals is more uniform, and the half-peak width of the indium phosphide nanocrystals is small. The fluorescence emission wavelength of the indium phosphide nanocrystals prepared by the present invention is 605-720nm, the half-peak width is not more than 38nm, the color purity of the indium phosphide nanocrystals is high, and the application is more extensive.

This invention belongs to the field of organic light-emitting materials and semiconductor technology, and provides a multi-aryl aromatic heterocyclic compound, its preparation method, and an electroluminescent device. The structural formula of the multi-aryl aromatic heterocyclic compound is: [structure omitted]. Using this multi-aryl aromatic heterocyclic compound as the guest light-emitting material, the luminous efficiency of the electroluminescent device is effectively improved, its lifespan is extended, and the purity of the emitted color is significantly improved. The light emitted by the electroluminescent device is in the green to red light range.

The present invention relates to an organic electroluminescent compound and an organic electroluminescent device as shown in formula I. The present invention provides an organic electroluminescent compound applied to an organic electroluminescent device, which has the characteristics of low driving voltage and high luminous efficiency.

The utility model discloses a Si packaging substrate with a light reflection structure and a light absorption structure, comprising a silicon-based substrate, the end face of which is provided with a plurality of grooves in an array manner, and the longitudinal section of each groove is V-shaped; the LED chip is positioned on the bottom surface of the groove through conductive solder, the light-emitting surface of the LED chip faces outwards, and the light conversion layer covers the light-emitting surface; the reflecting layer is arranged on the wedge-shaped side face of the groove and extends to the end face of the silicon-based substrate, and a passivation layer is arranged on the surface of the reflecting layer and / or between the surface of the reflecting layer and the end face of the silicon-based substrate; and the light absorption enclosing wall is arranged on the passivation layer on the outer side of the top of the groove and is of a continuous strip-shaped structure. The array micro light source can solve the problems of poor light utilization rate, poor light collimation performance and poor light crosstalk prevention performance when the existing array micro light source is used.

The invention discloses a cholesteric liquid crystal and polymer composite system film and a preparation method thereof, and belongs to the field of flexible liquid crystal display, and the method comprises the following steps: by taking a liquid crystal polymerizable monomer / chiral agent / photoinitiator as a main body, forming PDLC (Polymer Dispersed Liquid Crystal) by adding micromolecular nematic liquid crystal into the main body; and ultraviolet curing is performed to obtain the cholesteric liquid crystal and polymer composite system film with the micromolecular liquid crystal anchored by the polymerization network. According to the cholesteric liquid crystal film, an internal system is fixed through a polymer network, the reflectivity of the film is improved through small-molecule liquid crystals, the mechanical and optical performance of the liquid crystal film is optimized, and the cholesteric liquid crystal film is suitable for flexible display.