Multiplex quantum dot, preparing method thereof and flexible display device

A flexible display, quantum dot technology, applied in electrical components, electrical solid devices, chemical instruments and methods, etc., can solve the problems of unstable emission spectrum, short fluorescence lifetime, poor stability of quantum dots, and achieve symmetrical emission spectrum, fluorescence Long life and good stability

Inactive Publication Date: 2017-08-22
广州琉芯光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the preparation of quantum dots by the above method, the yield is low and the prepared quantum dots have the problems of unstable luminescence spectrum, short fluorescence lifetime, uneven size and poor stability.

Method used

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  • Multiplex quantum dot, preparing method thereof and flexible display device
  • Multiplex quantum dot, preparing method thereof and flexible display device
  • Multiplex quantum dot, preparing method thereof and flexible display device

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preparation example Construction

[0029] The present invention provides a method for preparing multivariate quantum dots, which includes the following steps:

[0030] (1) Mix the first zinc source, sulfur source and the first non-coordinating solvent, heat it and keep it warm to obtain a quantum dot precursor;

[0031] (2) Mix the quantum dot precursor prepared in the step (1) with the second non-coordinating solvent and the second zinc source, and heat it to obtain the multi-element quantum dot.

[0032] In the present invention, the first zinc source, the sulfur source and the first non-coordinating solvent are mixed, heated and kept warm to obtain a quantum dot precursor. The present invention does not specifically limit the heating operation, as long as the technical solution for heating well known to those skilled in the art can be used. In the present invention, it is heated to the synthesis temperature of the quantum dot precursor and the temperature is kept; in the present invention, the temperature of the h...

Embodiment 1

[0085] (1) Put 1mmol of CdO, 10mmol of zinc acetate, 7mL of oleic acid and 15mL of 1-octadecene into a 100mL four-necked flask, vacuum for 40min to a vacuum of 0.1KPa, heat to 100℃, and ventilate After heating to 280°C for three times, 1 mL of sulfur 1-octadecene solution was injected, and the concentration of the sulfur 1-octadecene solution was 0.5 mmol / mL.

[0086] (2) Keep the above mixed solution at 280°C for 10 minutes to obtain the CdZnS quantum dot solution and then cool it to room temperature. According to the volume ratio of the quantum dot solution to oleic acid 1:1, add oleic acid to the quantum dot solution; Divide the mixture of dot and oleic acid into 5mL centrifuge tubes, centrifuge at 4000rpm / min for 5min;

[0087] (3) Remove the lower layer of precipitation, add n-hexane to dissolve it, add the n-hexane solution to acetonitrile to promote precipitation, and perform centrifugal separation again according to the above-mentioned centrifugal method;

[0088] (4) Repeat...

Embodiment 2

[0097] (1) Put 0.1mmol zinc stearate, 0.5mmolS powder and 10mL 1-octadecene solution into a 100mL four-necked flask, vacuum for 40min to a vacuum of 0.1KPa, heat to 100℃, ventilate three times and heat to 280 After 1 mL of sulfur 1-octadecene solution was injected.

[0098] (2) Keep the above mixed solution at 280℃ for 10 minutes to obtain the ZnS quantum dot solution and then cool it to room temperature. According to the volume ratio of the quantum dot solution to oleic acid 1:1, add oleic acid to the quantum dot solution; Divide the mixture of dot and oleic acid into 5mL centrifuge tubes, centrifuge at 4000rpm / min for 5min;

[0099] (3) Remove the lower layer of precipitation, add n-hexane to dissolve it, add the n-hexane solution to acetonitrile to promote precipitation, and perform centrifugal separation again according to the above-mentioned centrifugal method;

[0100] (4) Repeat step (3) 4 times, and the obtained precipitate is the quantum dot precursor;

[0101] (5) Add the o...

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Abstract

The invention provides a multiplex quantum dot, a preparing method thereof and a flexible display device. A two-step method is adopted to prepare the multiplex quantum dot through the mode of adding zinc sources, which is beneficial to avoiding the generation of a by-product of zinc caused when the zinc sources are added with an excessive quantity at one time, avoiding independent nucleations of excessive zinc, achieving control over the size of the multiplex quantum dot, and improving the evenness of particle diameters; the multiplex quantum dot is good in crystalizing effect and good in stability. The prepared multiplex quantum dot has the advantages of being half-peak in width, symmetric in luminescent spectrum, long in fluorescence lifetime, and high in quantum dot yield, and is beneficial to prolonging the service life of the display device when applied to the flexible display device. A result of the embodiment shows that the prepared the multiplex quantum dot is long in fluorescence lifetime, half-peak in width and symmetric in luminescent spectrum, and the fluorescence yield reaches 80% or above.

Description

Technical field [0001] The invention relates to the technical field of nano-functional materials, in particular to a multi-element quantum dot, a preparation method thereof, and a flexible display device. Background technique [0002] The flexible display device is a spherical nano-sized quantum dot display device composed of quantum dots such as LnP or ZnSe. The light-emitting characteristics of quantum dots replace the backlight effect of LCD, and the color effect produced is generally 50% higher than that of liquid crystal screens. The cost is reduced, and the introduction of quantum dot materials also provides feasibility for the preparation of flexible display devices. This technology is called flexible display device manufacturing technology. It is a light-emitting display device prepared using quantum dots. Because quantum dots can emit light in a wide band, have strong coordination, and high color purity, they can be formed by single light emission or mixed White light. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56H01L51/50
CPCC09K11/565H10K50/115
Inventor 张虚谷纪丽珊王凛烽蒋杰李丹阳张青松银子凯
Owner 广州琉芯光电科技有限公司
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