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A method and application for stabilizing electroluminescence spectra of mixed halide perovskite materials

A perovskite material and luminescent technology, applied in the direction of electroluminescent light source, electric light source, light source, etc.

Active Publication Date: 2021-04-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There is no report on the study of the luminescence spectrum of the electroluminescent device using alternating current to drive the mixed halogen perovskite material, and it is still blank

Method used

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  • A method and application for stabilizing electroluminescence spectra of mixed halide perovskite materials
  • A method and application for stabilizing electroluminescence spectra of mixed halide perovskite materials
  • A method and application for stabilizing electroluminescence spectra of mixed halide perovskite materials

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Embodiment 1

[0032] The method for stabilizing the luminescent spectrum of a mixed halogen perovskite electroluminescent diode provided by the invention, the perovskite refers to having A r B s x t Structure of halogen perovskite and perovskite-like structure, light-emitting diode refers to the traditional electroluminescent light-emitting diode device. Wherein A is a cation, preferably one of organic amines, Cs or Rb and satisfies 1≤r; B is a cation, preferably one of Pb, Sn, Sb and Bi, and 1≤s; X is a halogen Ions, preferably a combination of two of I, Br and Cl. A is Cs + ; B is Bi 3+ , Sb 3+ , In 3+ One of them; X is Cl - 、Br - or I - One of the specific methods includes the following steps:

[0033] 1) Preparation A r B s x t thin film devices;

[0034] First, prepare A r B s x t solution, such as CsPbBr 1.65 Cl 1.35 / DMSO solution (0.2mmol), and then adopt traditional process to prepare light-emitting diode with traditional structure, such as ITO / PEDOT:PSS / perovski...

Embodiment 2

[0044] The method for stabilizing the luminescent spectrum of a mixed halogen perovskite electroluminescent diode provided by the invention, the perovskite refers to having A r B s x t Structure of halogen perovskite and perovskite-like structure, light-emitting diode refers to the traditional electroluminescent light-emitting diode device. Wherein A is a cation, preferably one of organic amines, Cs or Rb and satisfies 1≤r; B is a cation, preferably one of Pb, Sn, Sb and Bi, and 1≤s; X is a halogen Ions, preferably a combination of two of I, Br and Cl. A is Cs + ; B is Bi 3+ , Sb 3+ , In 3+ One of them; X is Cl - 、Br - or I - One of the specific methods includes the following steps:

[0045] 1) Preparation A r B s x t thin film devices;

[0046] First, prepare A r B s x t solution, such as CsPbBr 1.5 I 1.5 / DMSO solution (0.2mmol), and then adopt traditional process to prepare light-emitting diode with traditional structure, such as ITO / PEDOT:PSS / perovskite / ...

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Abstract

The invention belongs to the field of semiconductor materials and devices, and discloses a method and application for stabilizing the electroluminescent spectrum of a mixed halogen perovskite material. The method is to construct a light-emitting diode device by using a mixed halogen perovskite light-emitting material as a light-emitting layer material, By applying an alternating current to the diode device as an operating voltage, the halogen drift and phase separation process of the mixed halogen perovskite luminescent material under an electric field can be suppressed, the luminescent spectrum of the diode device can be stabilized, and the electric potential of the mixed halogen perovskite material can be stabilized. Luminescence spectrum; wherein, the forward voltage waveform in the alternating current can drive the diode device to work, and the reverse voltage waveform can drive the ion migration in the diode device. The invention introduces alternating current and utilizes the positive and negative voltages of the alternating current to suppress and restore the ion migration of halogens in the perovskite, stabilize the structural phase of the perovskite, and effectively stabilize the mixed halogen perovskite material compared with the prior art electroluminescence spectrum.

Description

technical field [0001] The invention belongs to the field of semiconductor materials and devices, and more specifically relates to a method for stabilizing the electroluminescent spectrum of a mixed halogen perovskite material. Background technique [0002] Halogen perovskite materials are optoelectronic materials that have attracted much attention in recent years, and have been widely used in solar cells (PV), light-emitting diodes (LED), optical detection, catalysis, etc. Among the halogen perovskite materials, the most representative one is ABX 3 Single perovskite structure materials. Where A is an organic amine or an inorganic alkali metal, such as methylamine, Cs, etc., and B is a metal cation that can form a coordination octahedron, such as Pb 2+ , Sn 2+ etc. At present, there are also trivalent ions (Bi 3+ , Sb 3+ etc.) to replace the B site to form a low-dimensional perovskite structure, X represents the halogen, I - , Br - or Cl - . [0003] The outstanding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/30H01L51/50H05B44/00
CPCH10K50/11
Inventor 唐江谭智方罗家俊高亮杨龙波牛广达
Owner HUAZHONG UNIV OF SCI & TECH
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