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A quantum dot with high blue light absorption rate and its preparation method

A technology of quantum dots and absorption rate, which is applied in the field of quantum dots and its preparation, can solve the problems of backlight module thickness control difficulty, increased manufacturing cost, low blue light absorption rate, increased thickness, etc., to achieve reduced energy consumption and high blue light absorption rate , the effect of reducing thickness

Active Publication Date: 2021-06-01
宁波纳鼎新材料科技有限公司
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Problems solved by technology

[0005] For the problem of low blue light absorption rate, the current solution is to increase the amount of quantum dots in the quantum dot light-emitting layer, but with the increase in the amount of quantum dots, the self-absorption effect of quantum dots is becoming more and more obvious, and the quantum dot film The thickness will also increase with the increase in the amount of quantum dots, and the difficulty of thickness control and manufacturing costs of the entire backlight module will increase

Method used

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  • A quantum dot with high blue light absorption rate and its preparation method
  • A quantum dot with high blue light absorption rate and its preparation method
  • A quantum dot with high blue light absorption rate and its preparation method

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preparation example Construction

[0031] The embodiment of the present invention also provides a preparation method of quantum dots with high blue light absorption rate, including:

[0032] providing a core composed of CdZnSeS;

[0033] The core is coated with a first shell layer and a second shell layer in sequence, and the material of the first shell layer is In 2 S 3 , the material of the second shell layer is ZnS.

[0034] In some embodiments, the following steps are included:

[0035] (1) Preparation of CdZnSeS core;

[0036] (2) React the mixed reaction system containing CdZnSeS core, indium source and sulfur source at 240-300°C, and grow In on the core 2 S 3 Shell;

[0037] (3) in 2 S 3 After the growth of the shell layer, the precursor containing zinc source and sulfur source is added to the mixed reaction system, and In is grown on the surface. 2 S 3 The ZnS shell is grown on the core of the shell to obtain CdZnSeS / In 2 S 3 / Reaction solution of quantum dots with ZnS structure.

[0038] W...

Embodiment 1

[0100] Red CdZnSeS / In 2 S 3 / ZnS synthesis: take 5ml Cd(OA) 2 with 30ml Zn(OA) 2 , 20ml of 1-octadecene, 10ml of oleic acid, 0.5g of trioctyl phosphine oxide were placed in a 250ml four-neck flask, vacuumed at 100°C until there were no bubbles, filled with argon, heated to 290°C, and injected quickly after reaching the temperature 2.2ml TBP / Se and TBP / S mixture, keep warm for a period of time, adjust the keep time according to the emission wavelength of the product, cool down the reaction system to 260°C after reaching the required wavelength, add 5ml 0.2M TBP / S dropwise with a syringe pump In and 6.7ml 0.3M S / OLAM precursor, react for 90min, and wrap In 2 S 3 Finally, raise the reaction temperature to 280°C, add 20ml of zinc stearate solution and 15ml of S / OLAM precursor dropwise with a syringe pump, add ethanol to purify after the reaction is completed, and disperse the obtained quantum dots into organic solvents such as chloroform .

[0101] The emission spectrum of t...

Embodiment 2

[0103] Green CdZnSeS / In 2 S 3 / ZnS synthesis: take 5ml Cd(OA) 2 with 32ml Zn(OA) 2 , 15ml of 1-octadecene, 10ml of oleic acid, and 0.8g of trioctyl phosphine oxide were placed in a 250ml four-neck flask, vacuumed at 100°C until there were no bubbles, filled with argon, heated to 300°C, and injected quickly after reaching the temperature 3.5ml TBP / Se and TBP / S mixed solution, keep warm for a period of time, the keep time should be adjusted according to the emission wavelength of the product, after reaching the required wavelength, adjust the temperature of the reaction system to 300°C, and add 8m1 0.2M TBP dropwise with a syringe pump / In and 3.6ml 1M TBP / S, react for 5min, wrap In 2 S 3 Finally, raise the reaction temperature to 280°C, and add 20ml of zinc chloride-oleylamine solution and 18ml of S / OLAM solution dropwise with a syringe pump. After the reaction is completed, add ethanol for purification, and the obtained quantum dots are dispersed in organic solvents such a...

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Abstract

The invention discloses a quantum dot with high blue light absorption rate and a preparation method thereof. The quantum dots include a core, the core is coated with a first shell and a second shell in turn, the core is composed of CdZnSeS, and the material of the first shell is In 2 S 3 , the material of the second shell layer is ZnS. The present invention coats In on the outside of the quantum dot core 2 S 3 , can improve the absorption ability of quantum dots to the blue excitation light, reduce the self-absorption of quantum dots at high concentrations, increase the luminous intensity of quantum dots, and reduce energy consumption. While ensuring the high absorption ability of blue excitation light, reduce the Quantum dots have low cadmium content and high blue light absorption rate. At the same time, it can reduce the content of heavy metals, reduce environmental pollution, reduce production costs, and obtain a quantum dot film with thin thickness, high brightness, and pure color, making it more suitable for photoluminescence-related applications that use blue light as an excitation light source.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a quantum dot with high blue light absorption rate and a preparation method thereof. Background technique [0002] After decades of development, high-quality quantum dots have shown excellent luminescent properties, such as wide absorption band, narrow emission peak, high brightness, uniform particle size distribution, and good stability. Group and so on have very bright application prospects. [0003] When quantum dots are used in display devices, they are mainly divided into two methods: electroluminescence and photoluminescence. The principle of photoluminescence is that the three primary colors of red, green and blue are mixed to produce white light. Specifically, the blue light is used to excite the red light quantum dots and green light quantum dots in the quantum dot light-emitting layer, and the emitted red light, green light, and the blue light of the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/883
Inventor 张孟张超
Owner 宁波纳鼎新材料科技有限公司
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