Layered perovskite luminescent material based on phase separation and luminescent enhancement method

A luminescent material, luminescence enhancement technology, applied in luminescent materials, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problems of large interlayer spacing, limited electroluminescence performance, poor charge transport performance, etc.

Active Publication Date: 2019-07-23
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, two-dimensional perovskites based on organic long-chain ions generally have a large interlayer distance, and the charge transport performance between layers is poor, which limits the final electroluminescent performance.
How to improve the charge transport ability of the luminescence active layer on the basis of the phase separation luminescence mechanism is the key to improve the final performance, but it is also a difficult point

Method used

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  • Layered perovskite luminescent material based on phase separation and luminescent enhancement method
  • Layered perovskite luminescent material based on phase separation and luminescent enhancement method
  • Layered perovskite luminescent material based on phase separation and luminescent enhancement method

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Embodiment Construction

[0021] figure 1 It is a schematic diagram of a two-dimensional layered perovskite lattice structure with localized phase separation according to the present invention; figure 2 is a schematic diagram of the charge transfer process in a two-dimensional layered perovskite material with localized phase separation according to the present invention. Such as figure 1 and 2 As shown, a two-dimensional layered perovskite material based on long-chain thiocyanate ions (SCN) proposed by the present invention and its internal local phase separation structure schematic diagram and charge transfer process are shown. For two-dimensional layered perovskite materials, driven by thermodynamics, there will be spontaneous phase separation inside, forming a mixed structure of wide and narrow bandgap materials, thus forming a local potential well. Driven by the energy difference, the charge carriers generated under photoexcitation or electric excitation will spontaneously transfer to the local...

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Abstract

The invention provides a layered perovskite luminescent material based on phase separation and a luminescent enhancement method, and belongs to the technical field of luminescence. The material comprises two-dimensional layered hybrid and inorganic perovskite materials formed by long-chain anions. A three dimensional-two dimensional hybrid structure and an energy band potential well are formed byphase separation of the material. Charge carriers can spontaneously transfer into the three-dimensional potential well, and high-concentration charge and high-efficiency luminescence are formed. By designing a substrate with high roughness, stress and strain can be introduced into a perovskite film deposited on the substrate, and accordingly, the degree of phase separation is increased, and finalluminous performance is enhanced.

Description

technical field [0001] The invention relates to the technical field of luminescence, in particular to a layered perovskite luminescent material based on phase separation and a luminescence enhancement method. Background technique [0002] In recent years, organic-inorganic hybrid perovskite semiconductors have been widely used for photoluminescence and electroluminescence. But due to its unique physical properties, the luminous efficiency is low. The quantum efficiency of electroluminescence based on 3D hybrid perovskite can only reach 8.5%. In order to improve the luminescence performance of this type of material, a two-dimensional-three-dimensional hybrid perovskite was introduced using long-chain organic ions. In this type of materials, two-dimensional and three-dimensional materials will have a certain degree of phase separation, forming a quantum well structure, which can be used for charge localization and efficient light emission. However, two-dimensional perovskit...

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/06H01L51/42H01L51/48H01L51/46B82Y20/00B82Y30/00
CPCC09K11/665C09K11/06B82Y20/00B82Y30/00C09K2211/10H10K71/12H10K85/30H10K30/15Y02E10/549
Inventor 石将建孟庆波李冬梅罗艳红吴会觉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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