Red light-emitting core-shell quantum dot and synthetic method thereof

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: 2014-07-09
CHAOHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mainly manifested in: 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; the 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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  • Red light-emitting core-shell quantum dot and synthetic method thereof
  • Red light-emitting core-shell quantum dot and synthetic method thereof
  • Red light-emitting core-shell quantum dot and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1 Synthesis of copper indium co-doped cadmium selenide nuclear quantum dots in octadecene medium

[0023] 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

[0024] Example 2 Shell cadmium selenide layer in octadecene medium

[0025] Stock solution preparation:

[0026] Mix 0.1 mmol cadmium stearate, 0.1 mmol dibenzyl selenide and 2 ml octadecene, and disperse by ultrasonic to obtain a suspension liquid, which is ready for use.

[0027] Encapsulation reaction:

[0028] 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, add an appropriate...

Embodiment 3

[0030] Example 3 Synthesis of copper indium co-doped cadmium selenide nuclear quantum dots in liquid paraffin medium

[0031] 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 red light-emitting core-shell quantum dot and a synthetic method thereof. A chemical structural formula of the quantum dot is (Cu, In):CdSe / Cdse, wherein a molar weight numeric ratio nCu / nIn of a dopant of a core quantum dot of the core-shell quantum dot is 0.80-1.20 and (nCu+nIn) / nCd is 0.02-0.08. The synthetic method of the core-shell quantum dot provided by the invention is completed by carrying out a one-pan heating two-step reaction in hydrocarbon media in the presence of organic ligands by taking a cadmium salt, an indium salt, a copper salt and a selenium ether as materials. First exciton absorption peak wavelength of the core-shell quantum dot is 450nm-475nm, and the emission peak wavelength is 610nm-660nm; and the prepared core-shell quantum dot is suitable for a red-light fluorescent powder material of a blue chip conversion type solid illuminating apparatus.

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 Applications(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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