Quantum dot composite material and preparation method thereof and quantum dot LED

A technology of composite materials and quantum dots, which is applied in the field of quantum dot composite materials and its preparation, and can solve problems such as the reduction of luminous efficiency of quantum dots

Inactive Publication Date: 2017-05-31
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a quantum dot composite material and its preparation method and quantum dot LED, aiming to solve the problem that the existing method of preparing quantum dot composite materials requires a phase conversion process and specific acid-base conditions. environment, leading to the problem that the luminous efficiency of quantum dots is greatly reduced

Method used

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  • Quantum dot composite material and preparation method thereof and quantum dot LED
  • Quantum dot composite material and preparation method thereof and quantum dot LED

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation steps of yellow light quantum dot LED are as follows:

[0042] 1. Yellow light quantum dots Cd 1-x Zn x Se y S 1-y Preparation

[0043] 1) Preparation of cadmium-zinc precursor mixture: 0.6 mmol cadmium oxide (CdO), 6 mmol zinc acetate (Zn(Ac) 2 ), 24mmol octadecylphosphonic acid (ODPA), and 15mL trioctylamine (TOA) were placed in a 100mL three-necked flask, heated to 150℃ and degassed under Ar atmosphere for 30 min. Put this mixture in N 2 Heat to 310 ℃ in an atmosphere until a clear and transparent cadmium-zinc precursor mixture is formed.

[0044] 2) Preparation of selenium-sulfur precursor mixture: mix 0.6 mmol selenium powder (Se), 4.35 mmol sulfur powder (S) and 3 mL trioctylphosphine (TOP), and heat and stir at 140 ℃ for 30 min, until a colorless and transparent selenium-sulfur precursor mixture is formed.

[0045] 3) Oil-soluble quantum dots Cd 1-x Zn x Se y S 1-y Preparation: Heat the cadmium-zinc precursor mixture to 310°C, and then quickly inject the...

Embodiment 2

[0051] The preparation steps of the red light quantum dot LED are as follows:

[0052] 1. Preparation of red light quantum dots CdSe / CdS / ZnS

[0053] 1) Preparation of cadmium oleate precursor mixture: Take 1 mmol CdO, 8 mmol oleic acid and 16 mL trioctylamine in a 100 mL three-necked flask, heat to 250°C under Ar atmosphere and exhaust for 1 hour to form transparent oleic acid Cadmium precursor mixture.

[0054] 2) Preparation of Se-TOP precursor mixture: Dissolve 0.25 mmol Se powder in 0.25 mL TOP solution and heat it at 80°C for 10 min to form a colorless and transparent Se-TOP precursor mixture.

[0055] 3) Preparation of the mixture of deca mercaptan and trioctylamine: mix 0.75 mmol deca mercaptan and trioctylamine in a volume ratio of 1:9, and stir at room temperature for 10 min to form deca mercaptan and trioctylamine 的mixture. 4) Preparation of zinc oleate precursor mixture: take 4 mmolZn(Ac) 2 With 4mL oleic acid and 2mL trioctylamine in a 100mL three-necked flask, heated to...

Embodiment 3

[0063] The preparation steps of green light quantum dot LED are as follows:

[0064] 1. Preparation of green light quantum dots CdSe / ZnS

[0065] 1) Preparation of cadmium oleate-zinc precursor mixture: take 0.2mmol CdO, 4mmol zinc acetate, 8mmol oleic acid and 15mL 1-octadecene in a 100mL three-necked flask, heat to 170℃ and exhaust under Ar atmosphere 1h, a transparent cadmium oleate-zinc precursor mixture is formed.

[0066] 2) Preparation of Se-S-TOP precursor mixture: 0.1mmol Se powder and 3.5 mmol S powder were dissolved in 2 mL trioctylphosphine at 140℃ to form a colorless and transparent Se-S-TOP precursor Mixture.

[0067] 3) Preparation of green light quantum dots CdSe / ZnS: The cadmium oleate-zinc precursor mixture is slowly heated to 300°C, and the Se-S-TOP precursor mixture is quickly injected once, and the reaction is maintained for 10 minutes. Then the temperature was lowered to 100°C, ethyl acetate was added for washing, and centrifuged to obtain a precipitate. Then,...

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Abstract

The invention discloses a quantum dot composite material and a preparation method thereof and a quantum dot LED. The method comprises the steps of making oil soluble quantum dots dissolve in non-polar solvent, after the oil soluble quantum dots completely dissolve, adding organic silicon source to form a quantum dot oil phase solution containing the organic silicon source, adding water into the quantum dot oil phase solution containing the organic silicon source, wherein the different layers are generated between the quantum dot oil phase solution and the water, and at the interface the organic silicon source and the water make contact to generate hydrolysis reaction; stirring to make the organic silicon source completely hydrolyzed; after stirring, keeping the solution static to separate the solution, extracting the quantum dot oil phase solution, removing the solvent in the quantum dot oil phase solution to form the quantum dot composite material. The preparation process of the quantum dot composite material neither needs specialized acid and alkaline environments, nor reduces the luminescent efficiency of the quantum dots. In the preparation process of an LED device, the material does not need to be packaged with organic resins, therefore the preparation process of the LED devices is simplified, the cost is reduced, and the service life of the LED devices is prolonged.

Description

Technical field [0001] The invention relates to the field of quantum dot materials, in particular to a quantum dot composite material, a preparation method thereof, and a quantum dot LED. Background technique [0002] In recent years, colloidal quantum dots have become the most promising new display materials due to their high quantum efficiency, high light purity, and adjustable emission wavelength. At present, researchers have been able to maturely prepare quantum dot materials with a quantum efficiency of up to 100%, which can be widely used in biomarkers, sensor devices and light-emitting diodes (LEDs). [0003] In the preparation process of quantum dot LED, it is necessary to use organic resin to coat the quantum dot on the LED chip, so the whole preparation process is more complicated, and the degradation of organic resin will not only reduce the luminous efficiency of quantum dot material, but also affect the use of LED life. In order to prevent the luminous efficiency of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88H01L33/26
CPCC09K11/025C09K11/883H01L33/26
Inventor 覃辉军
Owner TCL CORPORATION
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