Pure blue light perovskite light-emitting layer, preparation method thereof and light-emitting diode

A perovskite and light-emitting layer technology, applied in the manufacture of semiconductor/solid-state devices, electrical components, electric solid-state devices, etc., can solve the problems of difficult blue shift of luminescence peaks, low solubility of chloride ions, etc., and increase the recombination rate of exciton radiation , Improve spectral stability and improve device performance

Pending Publication Date: 2022-01-28
SUZHOU UNIV
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Problems solved by technology

[0007] In view of the above problems, we urgently need to develop a pure blue perovskite light-emitting layer and its preparation method, and light-emitting diodes, which can solve the problem of difficult blue shift of the luminescence peak caused by the low solubility of chloride ions in the perovskite precursor solution. , to realize the control of the luminescence peak in the pure blue band

Method used

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  • Pure blue light perovskite light-emitting layer, preparation method thereof and light-emitting diode
  • Pure blue light perovskite light-emitting layer, preparation method thereof and light-emitting diode
  • Pure blue light perovskite light-emitting layer, preparation method thereof and light-emitting diode

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preparation example Construction

[0041] In order to solve the problems of the prior art, a preparation method of a pure blue light perovskite light-emitting layer is provided. Including the following steps:

[0042] S1. Obtain a perovskite precursor solution, the perovskite precursor solution contains a halide, and the halide is a bromide;

[0043] S2. Coating the perovskite precursor solution on the substrate to form, then adding the anti-solvent solution containing chloride to the substrate for in-situ halogen ion exchange, and then post-treatment (annealing at 60-90°C for 5- 10min) to obtain a pure blue perovskite light-emitting layer mixed with chlorine and bromine.

[0044]Although the structure of an electroluminescent device generally includes a cathode, an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer and an anode, as long as the energy level matching is satisfied, some functional layers such as electron The transport la...

Embodiment 1

[0053] Example 1 This example provides a preparation method of a pure blue light perovskite light-emitting layer to obtain a pure blue light perovskite light-emitting layer and make a light-emitting diode, which is prepared by the following steps:

[0054] (1) Preparation of conductive substrate: use indium tin oxide glass as a conductive substrate, and use deionized water, acetone, and isopropanol to clean it ultrasonically in sequence; after drying, clean it with ultraviolet and ozone for 15 minutes, and set it aside.

[0055] (2) Prepare an aqueous solution of nickel oxide nanoparticles of 15 mg / ml, spin-coat it on indium tin oxide glass at a speed of 3000 rpm, and anneal at 100 degrees Celsius for 10 minutes to obtain a nickel oxide layer.

[0056] (3) Hole transport layer: prepare 5 mg per ml of polyvinylcarbazole chlorobenzene solution, spin-coat it on the nickel oxide layer at a speed of 3000 rpm, and anneal at 120 degrees Celsius for 10 minutes to obtain oxidation Two-...

Embodiment 2

[0062] Example 2 This example provides a preparation method for a pure blue perovskite light-emitting layer to obtain a pure blue perovskite light-emitting layer and make a light-emitting diode, which is basically the same as the embodiment, except that In the configured anti-solvent solution, take 4.0 mg of magnesium chloride.

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Abstract

The invention provides a preparation method of a pure blue-light perovskite light-emitting layer. The method comprises the following steps: S1, acquiring a perovskite precursor solution which contains halide which is bromide; and S2, coating the perovskite precursor solution on a substrate to form, then adding an anti-solvent solution containing chloride onto the substrate to carry out in-situ halogen ion exchange, and then carrying out post-treatment to obtain the chlorine-bromine mixed pure blue light perovskite luminescent layer. According to the method, the problem of difficult blue shift of a luminescence peak caused by low solubility of chloride ions in a perovskite precursor solution is solved, and the concentration of chloride is adjusted, so that the proportion of chloride ions and bromide ions is adjusted to realize regulation and control of the luminescence peak in a pure blue light wave band; and according to the method, the problem of component segregation caused by preferential crystallization of chlorine-rich perovskite in preparation of mixed halogen perovskite by a traditional solution method is solved, and the distribution uniformity of halide ions in perovskite is improved, so that the spectral stability of a blue-light perovskite light-emitting diode is improved.

Description

technical field [0001] The invention relates to a pure blue light perovskite light-emitting layer, a preparation method thereof, and a light-emitting diode. Background technique [0002] Light-emitting diodes are the core components of display and lighting, and the development of high-efficiency and low-cost light-emitting diodes is the key to promoting the further development of the display and lighting industry. In recent years, perovskite light-emitting diodes have developed rapidly. Researchers first reported its room temperature electroluminescence in 2014. In just a few years, the efficiency of green, red, and near-infrared perovskite light-emitting diodes has exceeded 20%. In contrast, the performance of blue-light perovskite light-emitting diodes has developed slowly, especially for pure blue light bands with important application values ​​of wavelengths less than 470 nm. [0003] At present, quasi-two-dimensional perovskite luminescent materials have received exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/54H01L51/50
CPCH10K71/12H10K85/30H10K50/11H10K71/00
Inventor 任振伟陈煜
Owner SUZHOU UNIV
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