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A core-shell quantum dot emitting red light and its synthesis method

A technology of core-shell quantum dots and synthesis methods, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of reduced white light emission efficiency and blue light chip excitation efficiency, and achieves good reproducibility and convenient operation.

Inactive Publication Date: 2016-01-20
CHAOHU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main manifestations are: the difference between the emission peak wavelength and the absorption peak wavelength (Stokes shift) of the binary ⅡⅥ group core-shell quantum dots is small, and there is a problem of repeated absorption, which reduces the emission efficiency of white light; ternary and doped type red light emission quantum dots Most of the absorption curves of the points do not have typical characteristic absorption peaks, and when a few have characteristic absorption peaks, the wavelength of the first excitonic absorption peak is lower than 450nm, which reduces the excitation efficiency of blue light chips

Method used

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  • A core-shell quantum dot emitting red light and its synthesis method
  • A core-shell quantum dot emitting red light and its synthesis method
  • A core-shell quantum dot emitting red light and its synthesis method

Examples

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Embodiment 1 18

[0021] Example 1 Synthesis of copper indium co-doped cadmium selenide nuclear quantum dots in octadecene medium

[0022] Mix 0.2mmol cadmium stearate, 0.004mmol indium acetylacetonate, 0.004mmol copper acetylacetonate, 0.2mmol oleic acid, 0.3mmol dodecyl mercaptan, 0.205mmol dibenzyl selenide and 10ml octadecene; Argon for 5 minutes, heated to 210°C, kept the temperature for reaction, and took samples to measure the absorption spectrum; when the wavelength of the first exciton absorption peak was ≥ 430nm, the reaction was terminated. Cool until crusted.

Embodiment 2 18

[0023] The cladding cadmium selenide layer in the octadecene medium of embodiment 2

[0024] Stock solution preparation:

[0025] 0.1 mmol of cadmium stearate, 0.1 mmol of dibenzyl selenide and 2 ml of octadecene were mixed, and ultrasonically dispersed to obtain a suspension liquid for use.

[0026] Encapsulation reaction:

[0027] When the temperature of the nuclear quantum dot reaction solution in Example 1 drops to 170°C, add 1 / 2 of the cladding stock solution dropwise, then heat to 185°C, keep for 5 minutes, and take samples to measure the absorption spectrum. Cool, when the temperature of the reaction solution drops to 170°C, add another 1 / 2 amount of cladding stock solution dropwise, heat to 185°C, keep it for about 10 minutes, take a sample and measure the absorption spectrum until the wavelength of the first exciton absorption peak is ≥460nm , to terminate the reaction. When the reaction solution is cooled below 100°C, pour it into about 20ml of absolute ethanol, a...

Embodiment 3

[0029]Example 3 Synthesis of copper indium co-doped cadmium selenide nuclear quantum dots in liquid paraffin medium

[0030] Mix 0.2mmol cadmium oleate, 0.003mmol indium acetylacetonate, 0.003mmol copper oleate, 0.2mmol oleic acid, 0.4mmol dodecyl mercaptan, 0.204mmol dibenzyl selenide and 10ml liquid paraffin; For 5 minutes, heat to 215°C, keep warm for reaction, take a sample to measure the absorption spectrum; stop the reaction when the wavelength of the first exciton absorption peak is ≥ 425nm. Cool until crusted.

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Abstract

The invention discloses a core-shell quantum dot emitting red light and a synthesis method thereof. The chemical structural formula of the quantum dot is (Cu, In): CdSe / CdSe, wherein the dopant of the core quantum dot of the core-shell quantum dot is The molar weight ratio nCu / nIn is 0.80-1.20 and (nCu+nIn) / nCd is 0.02-0.08. The method for synthesizing core-shell quantum dots provided by the invention uses cadmium salts, indium salts, copper salts and selenides as raw materials, and completes the two-step reaction by one-pot heating in a hydrocarbon medium in the presence of organic ligands. By controlling the molar amount and ratio of each source, the concentration of the ligand, the reaction temperature and time, the first exciton absorption peak wavelength of the core-shell quantum dots is located at 450-475nm, and the emission peak wavelength is located at 610-660nm; the prepared core-shell quantum dots Quantum dots are suitable as red phosphor materials for blue chip-conversion solid-state lighting devices.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a core-shell quantum dot emitting red light. The invention also relates to a synthesis method of the core-shell quantum dot emitting red light. Background technique [0002] Semiconductor nanomaterials are a new class of functional materials with broad application prospects due to their physical and chemical properties related to size and shape. Quantum dots have the advantages of wide excitation spectrum and symmetrical emission spectrum, high fluorescence intensity and good photostability, and broadband absorption in the short wavelength direction. As a new type of optoelectronic material, they are used in solar cells, displays, lasers, Fields such as biological imaging and solid-state lighting show good application prospects. Quantum dots are divided into basic quantum dots, core-shell quantum dots, and doped quantum dots according to their structure. In the earl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02
Inventor 张忠平刘锦锦程应霞叶志诚
Owner CHAOHU UNIV
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