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Preparation method of perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity

A technology of light-emitting diodes and perovskites, which is applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc., can solve problems such as difficulties and few researches on blue light bands

Pending Publication Date: 2020-10-20
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The research on perovskite light-emitting diodes (PeLED) in the red and green bands has been partially reported, but there are few studies on the blue band and it faces certain difficulties, especially the chromaticity adjustable luminescence in the blue-green band. It is rarely reported, which is very important for PeLED to realize full-color display and white light source

Method used

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  • Preparation method of perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity
  • Preparation method of perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity
  • Preparation method of perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The two-dimensional organic-inorganic hybrid perovskite material is synthesized according to the following steps:

[0031] Step 1. The purity of all purchased chemical reagents is analytical grade. Add 3 mL of phenethylamine (PEA) solution into a round bottom flask equipped with magnets, and slowly drop 3 mL of hydrobromic acid (HBr) to form a white emulsion. Fill the round-bottom flask with argon, and fix the round-bottom flask on a magnetic stirrer with ice bath and stir for 2h. Remove the flask, add absolute ethanol dropwise until it is completely dissolved, and then transfer to the rotary evaporator to evaporate the excess solvent. The product obtained by rotary evaporation was put into a Buchner funnel, washed with ether and filtered under reduced pressure to obtain a pure white solid. Place it in a vacuum drying oven at 80°C for 12 hours to obtain pure bromophenethylamine (PEABr).

[0032] Step 2. Weigh 0.800g (2mmol) PEABr and 0.734g (2mmol) PbBr 2 , 0.022xg (0.2x ...

Embodiment 2

[0034] Such as figure 1 As shown, the structure of the light-emitting device from bottom to top is: ITO glass substrate, PEDOT: PSS, perovskite light-emitting layer, TPBi, LiF and Ag.

[0035] In the first step, the conductive indium tin oxide on the surface of the ITO glass substrate is patterned; acetone, isopropanol, and ultrapure water are used for ultrasonic for 15 minutes, and then the ITO is rinsed with ultrapure water several times to ensure a clean surface.

[0036] In the second step, the cleaned ITO glass substrate is placed in an infrared drying box and dried for 20 minutes.

[0037] In the third step, the dried ITO glass substrate is subjected to 15min ultraviolet ozone treatment, the purpose is to improve the ITO surface adhesion and work function.

[0038] In the fourth step, the surface of the ITO glass substrate completed by ultraviolet ozone was spin-coated with PEDOT:PSS at 5000r / min and 40s, and annealed at 120°C for 10min.

[0039] In the fifth step, the spin-coated...

Embodiment 3

[0043] Ultraviolet-visible spectroscopy (U-V) absorption test was performed on the perovskite film spin-coated on the quartz glass substrate.

[0044] figure 2 As shown, the two absorption peaks of this type of perovskite film are located at 400 nm and 430 nm, respectively.

[0045] The absorption peak at 400nm corresponds to PEA 2 PbBr 4 The intrinsic absorption of the material, its intensity gradually decreases with the increase of the MABr doping ratio, and the absorption peak intensity at 430nm increases with the increase of the MABr doping, which shows that in (PEA) 2 (MA) n-1 PbnBr 3n+1 The structure phase with n>1 is produced in the

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Abstract

The invention discloses a preparation method of a perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity. A PeLED device is formed by superposing a glass substrate withtransparent ITO, a hole transport layer, a perovskite light-emitting layer, an electron transport layer, an electron injection layer and a metal back electrode. According to the invention, through a solution method with simple process and high repeatability, a series of luminescent materials are synthesized by doping MABr into two-dimensional perovskite (PEA2PbBr4), and the quantity of different structural phases in the quasi-two-dimensional perovskite is controlled by regulating and controlling the doping amount of MABr, and finally, the perovskite light-emitting diode (PeLED) with adjustablechromaticity from dark blue light to green light is successfully prepared by combining a vacuum evaporation method.

Description

Technical field [0001] The invention belongs to the technical field of perovskite luminescence, and particularly relates to a method for preparing a perovskite light-emitting diode (PeLED) with adjustable blue-green light chromaticity. Background technique [0002] In recent years, metal halide perovskite materials have aroused great scientific interest of researchers due to their excellent photoelectric properties, such as long charge carrier diffusion distance, high mobility and low trap density. At the same time, its low cost, easy synthesis, solution processing and many other advantages make perovskite materials have great application potential in optoelectronic devices. Especially because of its very narrow emission peak half-width, high photoluminescence quantum yield (PLQY) and adjustable band gap properties, it has developed rapidly in the field of luminescence and photovoltaics. [0003] The research of perovskite light-emitting diodes (PeLED) in the red and green bands h...

Claims

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Application Information

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IPC IPC(8): H01L51/56H01L51/54
CPCH10K71/164H10K71/12H10K85/30H10K71/00
Inventor 吴晓明刘宝生印寿根芮红松张铮侯衍汝仉亚波
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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