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Core-shell quantum dot preparation method, quantum dot optoelectronic device

A core-shell quantum dot and quantum dot technology, which is applied in the preparation of core-shell quantum dots and the field of quantum dot optoelectronic devices, can solve the problems of cumbersome reaction process, long reaction time, and monodispersity of quantum dot size and morphology, and achieve synthesis Simple steps, short response time, good universal effect

Active Publication Date: 2019-11-08
NANJING TECH CORP LTD
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Problems solved by technology

[0005] However, the synthesis methods of various core-shell quantum dots currently developed have disadvantages such as long reaction time, cumbersome reaction process, high cost, and large energy consumption, which are not conducive to core-shell quantum dots. Mass production of quantum dots
The amount of precursor required to form the core layer increases with the increase in the thickness of the shell layer. During the synthesis process of the shell layer, with the continuous addition of precursors, self-nucleation is prone to occur, making the size and shape of quantum dots Monodispersity becomes worse, fluorescence half-peak width narrows, etc., and it is also difficult to synthesize quantum dots with complex structures or special structures

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[0023] The invention provides a method for preparing core-shell quantum dots, comprising the following steps:

[0024] providing a first quantum dot, a second quantum dot, a ligand, and a first solution comprising an aliphatic amine, wherein the average particle size of the second quantum dot is smaller than the average particle size of the first quantum dot;

[0025] Mix the first quantum dot, the second quantum dot, the ligand and the first solution to form a reaction system. In the reaction system, the second quantum dot gradually dissolves, and the dissolved product of the second quantum dot grows outside the first quantum dot to form a shell , so as to prepare the core-shell quantum dots.

[0026] In the above technical solution, the first quantum dots are the quantum dots to be coated with the shell layer, and the second quantum dots are used to provide materials required for the growth of the shell layer. In the prior art, when growing the shell layer, the cation precu...

Embodiment 1

[0052] Synthesis of the first quantum dots (CdSe quantum dots with an average particle size of 6nm): CdO (0.1280g, 1mmol), tetradecanoic acid (0.5g, 2.2mmol) and ODE (4mL) were put into a 25mL three-necked flask, stirred After ventilating for 10 minutes, the temperature was raised to 280°C to obtain a clear solution, and the temperature was controlled at 250°C; 1 mL of selenium powder suspension with a concentration of 0.05 mmol / mL was quickly injected into the three-necked bottle, and the reaction temperature was controlled at 250°C. After reacting for 10 minutes, add 0.1 mL of selenium powder suspension with a concentration of 0.1 mmol / mL at a rate of 0.9 mL / h. After dropping the selenium powder suspension, continue to react for 5 minutes, and then add 1.5mmol oleic acid, after reacting for 5 minutes, add 0.1mL selenium powder suspension with a concentration of 0.1mmol / mL at a rate of 0.9mL / h, then react for 10 minutes, add 0.1mL of the above selenium powder suspension again,...

Embodiment 2

[0058] Synthesis of the first quantum dot InP quantum dot: Weigh 0.15mmol (0.043g) indium acetate, 0.45mmol (0.1036g) tetradecanoic acid, and 10mL ODE into a 50mL three-necked flask, heat up to 180°C and exhaust for 30 minutes, Then reduce the temperature to room temperature, inject 0.1mmol (TMS) 3 The mixed solution of P and 1mL TOP was then raised to 260°C, reacted for 5 minutes, purified, and dissolved in 1mL ODE.

[0059] Synthesis of small-sized ZnSe quantum dots: Weigh 0.1mmol zinc stearate, 5mLODE and 25mL three-necked flask, raise the temperature to 280°C, inject 1mL0.05mmol / mLSe-ODE suspension, react for 5min, stop the reaction, and purify , dissolved in 1 mL of ODE.

[0060] Synthesis of InP / ZnSe core-shell quantum dots:

[0061] (1) mixing the aforementioned first quantum dot solution with a quarter of the second quantum dot solution to obtain a quantum dot mixed solution;

[0062] (2) Mix 3mL of ODE and 2mL of oleylamine in a 25mL three-necked flask, stir and ve...

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Abstract

The invention discloses a core-shell quantum dot preparation method and a quantum dot optoelectronic device. The core-shell quantum dot preparation method comprises the following steps: a first quantum dot, a second quantum dot, a ligand, and a first solution containing a fatty amine are provided, wherein an average particle diameter of the second quantum dot is smaller than an average particle diameter of the first quantum dot; and the first quantum dot, the second quantum dot, the ligand, and the first solution are mixed to form a reaction system, in the reaction system, the second quantum dot is gradually dissolved, a dissolved product of the second quantum dot is grown outside the first quantum dot to form a shell layer, and thereby the core-shell quantum dot is produced. The synthesissteps of the core-shell quantum dot are simple, a reaction time is short, repeatability is good, and the method is favorable for large-scale production of the core-shell quantum dot, and also favorable for obtaining the core-shell quantum dot with good monodispersity.

Description

technical field [0001] The invention relates to the technical field of quantum dot materials, in particular to a method for preparing core-shell quantum dots and a quantum dot photoelectric device. Background technique [0002] In nanomaterials, solution semiconductor nanocrystals (solution quantum dots) with a size in the quantum confinement range have excellent optical properties, such as high fluorescence quantum yield, absorption bandwidth, narrow emission peak, and good optical stability. Widespread interest in science and industry. In the fields of biolabeling and imaging, light-emitting diodes, lasers, and quantum dot photovoltaic devices, quantum dot research has become one of the hotspots in their respective fields. Quantum dots have been used in practical applications in fields that affect people's daily life such as display (quantum dot backlight TV) and lighting. Especially in the field of display, compared with organic fluorescent materials and inorganic phosp...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00B82Y40/00H01L33/50
CPCC09K11/883B82Y20/00B82Y40/00H01L33/504Y02E10/549
Inventor 周健海蔡祥周
Owner NANJING TECH CORP LTD
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