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Particle and preparation method thereof

A technology of particles and metal ions, applied in the field of quantum dot luminescence, can solve the problems of low luminous efficiency and poor device stability, achieve high color purity, reduce fluorescence quenching, and avoid interference

Inactive Publication Date: 2019-10-01
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a particle and its preparation method, aiming to solve the problems of low luminous efficiency and poor device stability after perovskite quantum dots are made into display devices

Method used

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Examples

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preparation example Construction

[0014] Embodiments of the present invention firstly provide a method for preparing particles, which includes the following steps:

[0015] S10 provides perovskite quantum dot core;

[0016] S20 mixing the perovskite quantum dot core with the metal ion precursor solution in the d-zone of the first transition system, and preparing the perovskite quantum dot core doped with metal ions in the d-zone of the first transition system after heating;

[0017] S30 growing a shell layer on the surface of the perovskite quantum dot core doped with metal ions in the d-block of the first transition system to obtain the particles.

[0018] In the step S10, the perovskite quantum dot core can be prepared by a conventional method. For example, in a specific embodiment, the halide of the IA group element and the halide of lead are mixed in a mortar in a certain molar ratio. Mix in medium, dissolve the mixed solid powder in a certain volume of polar solvent in the state of magnetic stirring, add...

Embodiment 1

[0041] Manganese stearate doped inorganic perovskite quantum dots

[0042] (1) Put 2.85g of stearic acid and 20ml of methanol into a 100ml three-necked flask, and heat to 50°C in the air atmosphere to dissolve the stearic acid. After the solution is clear and transparent, keep the temperature of the solution at 40 °C, dissolve 3.64 g of tetramethylammonium hydroxide in 3 ml of methanol, add it into the stearic acid solution, and continue stirring for 60 min. Another 0.629g MnCl 2 Dissolve it in 5ml of methanol, add it into the mixed solution containing stearic acid and tetramethylammonium hydroxide after magnetic stirring, and obtain manganese stearate solution after magnetic stirring.

[0043] (2) Preparation of inorganic perovskite quantum dots: 0.119g KBr and 0.367g PbBr 2 Mix in a mortar with a molar mass ratio of 1:1, dissolve the mixed solid powder in 50 ml of N,N-dimethylsulfoxide under magnetic stirring, and stir for 20 min at a stirring speed of 150 rpm / min. First ...

Embodiment 2

[0048] Titanium stearate doped inorganic perovskite quantum dots

[0049] (1) Put 4.275g of stearic acid and 15ml of methanol into a 100ml three-necked flask, and heat to 60°C in an air atmosphere to dissolve the stearic acid. After the solution is clear and transparent, keep the temperature of the solution at 40°C, dissolve 5.46g of tetramethylammonium hydroxide in 4ml of methanol, add it into the stearic acid solution, and continue stirring for 30 minutes. Another 1.891g TiCl 4 Dissolve it in 6ml of methanol, add it into the mixed solution containing stearic acid and tetramethylammonium hydroxide after magnetic stirring, and obtain a titanium stearate solution after magnetic stirring.

[0050] (2) Preparation of inorganic perovskite quantum dots: 0.168g CsCl and 0.278g PbCl 2 Mix in a mortar with a molar mass ratio of 4:1, dissolve the mixed solid powder in 100 ml of N,N-dimethylsulfoxide under magnetic stirring, and stir for 50 min at a stirring speed of 5000 rpm / min. F...

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Abstract

The invention relates to a particle and a preparation method thereof. The particle comprises a core and a shell layer, wherein the shell layer is used for coating the core; the core is metal ion-dopedperovskite quantum dot in a zone d of a first transition system; the forbidden bandwidth of the shell layer material is greater than the forbidden bandwidth of the core material. The particle prepared by the preparation method has the advantage that when the particle is used as the material of a light emitting layer, the problems of fluorescence quenching, lower light emitting efficiency, poorerstability of device and the like due to energy transfer and reabsorbing in the working process of a display device can be solved. The preparation method has the advantages that the preparation is easy, the repeatability is good, and the problem of light emitting quenching of the display device due to temperature increase in the working process of the device can be well overcome.

Description

technical field [0001] The invention relates to the field of quantum dot luminescence, in particular to a particle and a preparation method thereof. Background technique [0002] In recent years, perovskite quantum dots have developed rapidly due to their size and component tunable optoelectronic properties and solution processing, and have become an indispensable new member of the "quantum dot family". Perovskite quantum dot materials also have unparalleled biochemical properties: such as good biocompatibility and low cytotoxicity. These superior properties make perovskite quantum dot materials have broad application prospects in display, lighting, optical detection and other fields. [0003] However, simply using the perovskite quantum dots synthesized at this stage to make a display device will slow down the movement rate of carriers inside the quantum dots in a high-temperature working environment, and thus be trapped by a large number of defect states on the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66C09K11/06B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/02C09K11/06C09K11/662C09K11/672C09K11/7702
Inventor 邓承雨杨一行钱磊谢相伟
Owner TCL CORPORATION
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