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A kind of alloy quantum dot and preparation method thereof

A technology of quantum dots and alloys, applied in the field of alloy quantum dots and their preparation, can solve the problems of complex preparation process of core-shell quantum dots, time-consuming and laborious, and difficulty in applying white light QLEDs.

Active Publication Date: 2021-04-09
TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on alloy quantum dots is basically based on CdSe / CdS quantum dots with core / shell structure, and due to the poor thermal stability of core / shell structure quantum dots, at the same time factors such as water, oxygen and temperature will affect the core-shell quantum dots. In addition, the preparation process of core-shell quantum dots is complicated, the purification is difficult, time-consuming and laborious, and the luminescence spectrum gradually changes with the increase of the size of the quantum dots, so it is difficult to synthesize a suitable particle size and a certain luminescence peak position. Core-shell quantum dots, core-shell quantum dots are difficult to meet the above requirements as luminescent materials, making it difficult to apply them to high-efficiency and stable white QLEDs, which restricts their application in the field of lighting and display

Method used

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  • A kind of alloy quantum dot and preparation method thereof
  • A kind of alloy quantum dot and preparation method thereof
  • A kind of alloy quantum dot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Get 0.1mmol Se powder and 4mmol S powder and dissolve in 1.5mL trioctylphosphine under the protection of an inert gas to prepare a TOP (Se+S) stock solution, in the TOP (Se+S) stock solution, the Se: S mole The ratio is 1:40.

[0035] Take 0.0256g of cadmium oxide, 0.878g of zinc acetate, 5mL of oleic acid, and 15mL of octadecene in a round-bottomed flask, and raise the temperature to 200-300°C for 0.5h under the protection of an inert gas to prepare a mixed stock solution of zinc and cadmium. Raise the temperature to 280-320° C., add the above TOP (Se+S) stock solution, and grow at 290-310° C. for 3-10 minutes to obtain CdSe@ZnS alloy quantum dots.

[0036] Take 0.256g of cadmium oxide, 2mL of oleic acid and 2mL of octadecene and raise the temperature to 200-300°C under the protection of inert gas to prepare a cadmium stock solution. Take 0.176g of zinc acetate, 4mL of oleic acid and 4mL of octadecene under the protection of inert gas Raise the temperature to 200-300°...

Embodiment 2

[0041] Get alloy quantum dot a, alloy quantum dot b, alloy quantum dot c, alloy quantum dot d, alloy quantum dot e and alloy quantum dot f in embodiment 1, its transmission electron microscope figure is as figure 2 As shown, the emission spectrum is shown as image 3 shown. according to figure 2 and image 3 It is known that the average quantum dot size and the corresponding fluorescence peak position corresponding to different alloy quantum dots are respectively: alloy quantum dot a corresponds to 8.3nm and 431nm, alloy quantum dot b corresponds to 8.3nm and 462nm, alloy quantum dot c corresponds to 8.4nm and 514nm, alloy quantum dot d corresponds to 8.1nm and 575nm, alloy quantum dot e corresponds to 8.2nm and 606nm, alloy quantum dot f corresponds to 8.5nm and 638nm. From the data results, it can be concluded that the average size of the six alloy quantum dots is in the range of 8.3±0.3nm, but the position of the fluorescence emission peak changes with the change of th...

Embodiment 3

[0043] Get 0.1mmol Se powder and 0.4mmol S powder and dissolve in 2mL trioctylphosphine under the protection of an inert gas to prepare a TOP (Se+S) stock solution, in the TOP (Se+S) stock solution, the Se:S mole The ratio is 1:4, take 0.0256g of cadmium oxide, 0.878g of zinc acetate, 5mL of oleic acid, and 15mL of octadecene in a round-bottomed flask, and raise the temperature to 200-300°C for 0.5h under the protection of an inert gas to prepare zinc Mix cadmium stock solution, then raise the temperature to 280-320°C and add the above TOP(Se+S) stock solution, grow at 290-310°C for 3-10min to obtain CdSe@ZnS alloy quantum dots, then add cadmium stock solution and S stock solution Liquid reaction 5-20min, then add zinc stock solution and TOP-S stock solution, react 10-20min to obtain alloy quantum dot A, described cadmium stock solution, S stock solution, zinc stock solution and TOP-S stock solution and embodiment 1 is the same. Adjusting the addition of Se powder and S powde...

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Abstract

The invention discloses an alloy quantum dot and a preparation method thereof. By adjusting the potential barrier of the intermediate interface, the peak position of the emission light can be effectively adjusted without changing with the growth of the size of the quantum dot, so as to realize the peak position of the light emission on a specific requirement. The particle size can be continuously adjusted to meet the requirements of the quantum dot size; by adjusting the ratio of the alloy composition, the emission wavelength can be continuously adjusted under the same particle size; by adjusting the quantum dot interface barrier and element ratio , realizing the continuous change of emitted light from blue-violet light to deep red light. The preparation process of the alloy quantum dot is simple, the cost is low, and it is easy to be industrially prepared on a large scale. The prepared alloy quantum dot has high optical stability and thermal stability, and has a good application prospect in the field of QLED backlight display and lighting.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to an alloy quantum dot and a preparation method thereof. Background technique [0002] Alloy quantum dots (Quantum Dots) is a nano-luminescent material with a chemical composition gradient alloy structure (Chemical Composition Gradients Alloy Structure, such as CdSe@ZnS), narrower FWHM (wide color gamut) and larger Diameter (large particle path). Alloy quantum dots have the following obvious advantages: Alloy quantum dots can efficiently control the luminescence spectrum of quantum dots by adjusting the composition; changing the size of quantum dots will not significantly change its optical band gap, thus ensuring that the luminescence peak remains unchanged Change the size of the alloy quantum dots; by controlling the size of the quantum dots, the Förster resonance energy transfer of the material can be adjusted to reduce the fluorescence self-quenching between the quantum dots; adjus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02
CPCC09K11/02C09K11/883
Inventor 马志伟李春峰杨磊卢睿安娜边盾
Owner TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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