Core-shell quantum dot and preparation method thereof, quantum dot film and light emitting diode

A core-shell quantum dot and core-quantum technology, applied in the fields of core-shell quantum dots and their preparation, quantum dot films and light-emitting diodes, can solve the problem that optical stability cannot meet the requirements of material performance stability, and achieve high stability , low toxicity, high controllable effect

Active Publication Date: 2020-09-15
NANJING TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the product development stage, we found that the optical stability exhibited by the above materials cannot meet the requirements of the existing quantum dot optical films or light-emitting diodes for material performance stability.

Method used

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  • Core-shell quantum dot and preparation method thereof, quantum dot film and light emitting diode
  • Core-shell quantum dot and preparation method thereof, quantum dot film and light emitting diode
  • Core-shell quantum dot and preparation method thereof, quantum dot film and light emitting diode

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preparation example Construction

[0044] The invention provides a method for preparing core-shell quantum dots, comprising the following steps:

[0045] S1, providing InP nuclear quantum dot solution;

[0046] S2, adding the InP nuclear quantum dot solution to the zinc precursor mixed solution to obtain the first reaction solution, the zinc precursor mixed solution includes the first zinc carboxylate precursor with a carbon chain length of 2 to 6 and a carbon chain length of 10-22 second zinc carboxylate precursor;

[0047] S3, adding a first anion precursor to the first reaction solution, the first anion precursor is a selenium precursor or a selenium-sulfur mixed precursor, and the second reaction solution is formed after the reaction, and the selenium-sulfur mixed precursor Se: S≥1:1;

[0048] S4, adding a second anion precursor to the second reaction solution, where the second anion precursor is a sulfur precursor, to obtain the core-shell quantum dots.

[0049] The present invention uses the mixed zinc...

Embodiment 1

[0055] Embodiment 1: the synthesis of InP nuclear quantum dot solution

[0056] 1) Add 0.58g of indium acetate (In(Ac) 3 , 2mmol), myristic acid 1.37g (MA, 6mmol), octadecene 50g (ODE) were weighed in turn and placed in a 250mL three-necked flask, and a magnet was added, nitrogen gas was passed, and the temperature of the system was raised to 170°C. Stirring speed 60rpm / min;

[0057] 2) Cool down to 50°C, inject 1mL P(TMS) 3 For the precursor, heat up to 290°C and react for 5 minutes until the position of the first exciton peak reaches 420-430nm;

[0058] 3) Cool down to 230°C, add TMSP precursor dropwise at a rate of 20mL / h, take a sample and monitor after adding for 5 minutes, and stop the reaction after the first UV exciton peak reaches the position of 450nm, 475nm, 495nm, 570nm, 600nm and 650nm respectively , to obtain InP nuclear quantum dot solution.

[0059] The resulting InP nuclear quantum dot solution can be further purified:

[0060] 4) Pour the prepared InP ...

Embodiment 2

[0063] Embodiment 2: Synthesis of core-shell quantum dots

[0064] The raw material formula of embodiment 2 and the partial properties of the obtained core-shell quantum dots are shown in the following table:

[0065] Table 1 Example 2 Raw material formula and core-shell quantum dot properties

[0066]

[0067]

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Abstract

The invention discloses a preparation method of core-shell quantum dots. According to the invention, a first zinc carboxylate precursor with a carbon chain length of 2-6 and a second zinc carboxylateprecursor with a carbon chain length of 10-22 are adopted as composite cation precursors in an InP nuclear quantum dot coating process to obtain core-shell quantum dots with less defect inside and controllable wavelength; and a quantum dot film and a light emitting diode which are prepared from the core-shell quantum dots are relatively high in stability in a room-temperature environment and a high-temperature and high-humidity acceleration test, and can be used for manufacturing a light emitting element with long service life.

Description

technical field [0001] The invention relates to the field of photoelectric technology, in particular to a core-shell quantum dot and a preparation method thereof, a quantum dot film and a light-emitting diode. Background technique [0002] With the advancement of quantum dot synthesis technology and the in-depth application of quantum dots in related fields, the toxicity of quantum dots and their impact on the environment have attracted more and more attention. Although the traditional IIB-VI quantum dots such as CdTe and CdSe have been relatively mature in technology development, their inherent shortcomings of containing cadmium, a toxic element, will greatly limit their future applications. For example, the Restriction of Hazardous Substances (RoHS) has regarded cadmium as the most dangerous toxic heavy metal. The European Union stipulates that from October 2019, TVs and monitors sold in Europe will ban the use of cadmium in the RoHS directive. Restricted hazardous substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/70C09K11/02B82Y20/00H01L51/50B82Y30/00B82Y40/00
CPCC09K11/883C09K11/70C09K11/02B82Y20/00B82Y30/00B82Y40/00H10K50/115
Inventor 陈小朋赵海洋
Owner NANJING TECH CORP LTD
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