CsPbX<3> perovskite nanocrystalline electroluminescent diode with self-assembled multi-dimensional quantum well

A quantum well and nanocrystalline technology, applied in circuits, electrical components, electric solid devices, etc., can solve the problem of low external quantum efficiency of pure blue light and pure red LED, poor electrical, optical and thermal stability of nanocrystals, and can not achieve practical Application standards and other issues, to achieve the effect of high luminous efficiency and external quantum efficiency of electroluminescent diode LED, good stability and less defects

Active Publication Date: 2020-03-31
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

This is because CsPbX 3 The nature of the intrinsic ionic crystal, its lattice formation energy is weak, resulting in very poor electrical, optical, and thermal stability of the nanocrystal, and the life of the LED device is very short, which is far from meeting the requirements of practical application standards.
And the external quantum efficiency of pure blue light and pure red LED is very low

Method used

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  • CsPbX&lt;3&gt; perovskite nanocrystalline electroluminescent diode with self-assembled multi-dimensional quantum well
  • CsPbX&lt;3&gt; perovskite nanocrystalline electroluminescent diode with self-assembled multi-dimensional quantum well
  • CsPbX&lt;3&gt; perovskite nanocrystalline electroluminescent diode with self-assembled multi-dimensional quantum well

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Experimental program
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Effect test

Embodiment 1

[0031] lead halide (PbX 2 ), oleic acid (OA), and octylamine (OTA) were mixed according to the molar ratio of 1:0.3:0.6, placed in the container of the heating device, stirred, vacuumed, and heated to 100°C to obtain 0.5 mole Concentration of lead precursor solution; cesium carbonate (Cs 2 CO 3 ), oleic acid (OA) was added to octadecene (ODE) according to the molar ratio of 1:0.4, and then placed in a heating device container, stirred, vacuumed, and heated to 100°C to obtain 0.5 molar concentration of Cesium precursor solution; under inert gas protection conditions, the cesium precursor solution is heated to 100°C, and a 0.5 molar concentration of lead precursor solution is injected. Incubate for 60 seconds. During this process, the two-dimensional CsPbX 3 The nanosheets are gradually assembled into nanocrystals with a multidimensional quantum well structure, and the size of the nanocrystals is 20 nanometers. Use an ice bath to quickly cool down the reaction solution to 0°...

Embodiment 2

[0035] lead halide (PbX 2 ), oleic acid (OA), and octylamine (OTA) were mixed according to the molar ratio of 1:0.4:0.8, placed in the container of the heating device, stirred, vacuumed, and heated to 120°C to obtain 1.0 mole Concentration of lead precursor solution; cesium carbonate (Cs 2 CO 3 ), oleic acid (OA) was added into octadecene (ODE) according to the molar ratio of 1:0.5, and then placed in a heating device container, stirred, vacuumed, and heated to 120°C to obtain 0.7 molar concentration of Cesium precursor solution; under inert gas protection conditions, the cesium precursor solution is heated to 120°C, and a lead precursor solution with a concentration of 1.0 molar is injected. Incubate for 40 seconds. During this process, the two-dimensional CsPbX 3 The nanosheets are gradually assembled into nanocrystals with a multidimensional quantum well structure, and the size of the nanocrystals is 30 nanometers. Use an ice bath to quickly cool down the reaction solut...

Embodiment 3

[0039] lead halide (PbX 2 ), oleic acid (OA), and octylamine (OTA) were mixed according to the molar ratio of 1:0.5:1, placed in the container of the heating device, stirred, vacuumed, and heated to 150 ° C to obtain 1.5 moles Concentration of lead precursor solution; cesium carbonate (Cs 2 CO 3 ), oleic acid (OA) was added to octadecene (ODE) according to the molar ratio of 1:0.6, and then placed in a heating device container, stirred, vacuumed, and heated to 150°C to obtain 1.0 molar concentration of Cesium precursor solution; under inert gas protection conditions, the cesium precursor solution is heated to 150°C, and a lead precursor solution with a concentration of 1.5 moles is injected. Incubate for 30 seconds. During this process, the two-dimensional CsPbX 3 The nanosheets are gradually assembled into nanocrystals with a multidimensional quantum well structure, and the size of the nanocrystals is 40 nanometers. Use an ice bath to quickly cool down the reaction soluti...

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Abstract

The invention discloses a CsPbX<3> perovskite nanocrystalline electroluminescent diode with a self-assembled multi-dimensional quantum well, and belongs to the field of nanotechnology and light-emitting display. The diode is composed of a transparent conductive oxide anode TOC, a hole transport layer material HTL, a CsPbX3 nanocrystalline light-emitting layer EL with a multi-dimensional quantum well structure, an electron transport layer material ETL and a metal cathode CL. Firstly, a self-assembled multi-dimensional quantum well CsPbX3 nanocrystalline solution is prepared by adopting a chemical synthesis method. Then, a hole transport layer material HTL, a CsPbX3 self-assembled multi-dimensional quantum well nanocrystalline solution and an electron transport layer material ETL are spin-coated on the TOC by adopting spin-coating technology. Finally a metal cathode CL on the ETL is deposited by adopting a vacuum evaporation technology. According to the invention, any emission spectrumwithin a visible light emission range of 400-700 nanometers can be realized by regulating and controlling the dimension and components of the self-assembled multi-dimensional quantum well CsPbX3 nanocrystalline; the fluorescence quantum yield of the CsPbX3 nanocrystalline with the multi-dimensional quantum well structure is high, and the defects are few; an electroluminescent diode is high in luminous efficiency and external quantum efficiency, good in stability and long in service life.

Description

technical field [0001] The invention belongs to the field of nanotechnology and light-emitting display, in particular to the preparation of self-assembled multi-dimensional quantum well cesium lead halide CsPbX 3 The perovskite nanocrystalline electroluminescence diode is applied in the fields of light emission, lighting and display, etc. Background technique [0002] Semiconductor nanocrystals with quantum confinement effects exhibit unique physical and electronic properties, such as size efficiency, adjustable band gap, and multiple excitonic effects, and have important applications and development prospects in the fields of optoelectronics, biology, and energy. Among them, the preparation process of the colloidal semiconductor nanocrystal solution is simple, the raw material cost is low, and the size and dimension can be adjusted through the chemical synthesis process, and the photoelectric characteristics can be well adjusted, showing great application potential. The me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K71/12H10K50/115
Inventor 田建军毕成浩姚志伟
Owner UNIV OF SCI & TECH BEIJING
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