3results 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.

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 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.