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Preparation method of multilayered shell structure nanorod and preparation method of white light LED

A technology of nanorods and multi-layer shells, applied in nano optics, nanotechnology, nanotechnology, etc., can solve the problems of quantum dot luminescence spectrum instability, short fluorescence life, poor stability, etc., to prevent self-absorption loss of photons, fluorescence Long life and good stability

Inactive Publication Date: 2018-05-15
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

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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  • Preparation method of multilayered shell structure nanorod and preparation method of white light LED
  • Preparation method of multilayered shell structure nanorod and preparation method of white light LED
  • Preparation method of multilayered shell structure nanorod and preparation method of white light LED

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preparation example Construction

[0043] A method for preparing nanorods with a multilayer shell structure, comprising:

[0044] (1) Mix the first cadmium source, the first phosphine source, the first weak coordination solvent and oleyl alcohol, and heat to obtain the quantum dot precursor; There is no special requirement for the specific source of the heating agent, and commercially available products well known to those skilled in the art can be used, and there is no special requirement for the specific heating method.

[0045] (2) Mix the quantum dot precursor prepared in the step (1) with the second non-coordinating solvent and the first selenium source, and keep warm to obtain nanorod seeds.

[0046] (3) Mix the above nanorod seed solution with ethanol in a certain volume ratio and perform centrifugal purification, and store it in an organic solvent after purification for many times, which is called a nanorod solution.

[0047] (4) Mix the second cadmium source, the second phosphine source, and the secon...

Embodiment 1

[0074] Preparation specific steps of CdSe nanorod seeds

[0075] (1) Weigh 26mg of cadmium oxide, 112mg of tetradecylphosphonic acid, and 1500mg of tri-n-octylphosphine oxide into a 50ml three-necked flask, vacuumize, and set the temperature at 150 degrees. When the actual temperature is about 70 degrees, TDPA and TOPO dissolve, start vacuuming, slowly raise the temperature to 150 degrees, the vacuuming time is 1 hour, the first 15 minutes, a total of switching vacuuming and argon three times, the middle 30 minutes has been vacuuming After 15 minutes, switch to evacuate and pass argon three times.

[0076] (2) After vacuuming, the actual temperature rises rapidly to about 330 degrees. Shake the three-neck flask to speed up the dissolution of CdO. After the CdO is completely dissolved, the solution becomes transparent.

[0077] (3) Inject 0.75ml of TOP. The main function of TOP is to remove oxygen. TOP can be injected along the inner wall of the three-necked flask, so that the...

Embodiment 2

[0084] (1) Weigh 26mg of cadmium oxide, 140mg of tetradecylphosphonic acid, and 1500mg of tri-n-octylphosphine oxide into a 50ml three-necked flask, vacuumize, and set the temperature at 150 degrees. When the actual temperature is about 70 degrees, TDPA and TOPO dissolve, start vacuuming, slowly raise the temperature to 150 degrees, the vacuuming time is 1 hour, the first 15 minutes, a total of switching vacuuming and argon three times, the middle 30 minutes has been vacuuming After 15 minutes, switch to evacuate and pass argon three times.

[0085] (2) After vacuuming, the actual temperature rises rapidly to about 330 degrees. Shake the three-neck flask to speed up the dissolution of CdO. After the CdO is completely dissolved, the solution becomes transparent.

[0086] (3) Inject 0.75ml of TOP. The main function of TOP is to remove oxygen. TOP can be injected along the inner wall of the three-necked flask, so that the reactants volatilized on the inner wall of the three-necke...

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Abstract

The invention provides a multilayered shell structure nanorod and a preparation method of the multilayered shell structure nanorod, and a preparation method of a white light LED. A multilayered core-shell structure quantum dot is prepared by a step-by-step inorganic shell layer coating method of an anion-cation alternative filling method, and the method is helpful to avoid corresponding ion side products with different valence states for adding excessive anion or cation ions in one time, avoid excessive independent core formation, realize the control of the quantum dot dimension, and improve the uniformity of the grain diameter. The multilayered shell structure nanorod has good crystal forming effect and good stability. The quantum dot prepared by the invention has the advantages of narrowhalf-peak width, symmetrical luminescence spectrum, stable optical property, and high yield of the quantum dot; the quantum dot is applied to prepare the white light LED, and the white light LED is high in color purity, good in stability, and nearly free from light attenuation. The result of the embodiment indicates that the prepared quantum dot is narrow in half-peak width and symmetrical in spectrum; the fluorescence yield is over 80%; the white light LED is good in stability and high in color purity, and its CIR is more than 90.

Description

technical field [0001] The invention relates to the technical field of nanometer functional materials, in particular to a nanorod with a multilayer shell structure, a preparation method thereof and a white light LED. Background technique [0002] White light LED is prepared by adding spherical nano-sized nano-materials composed of quantum materials and coating them on blue-light substrate chips, or preparing white light beads with rare earth materials. The effect is generally 50% higher than that of liquid crystal screens, and the cost is reduced, and the introduction of nanorod materials also provides feasibility for the preparation of white light leds. This technology is called nano-rod white light LED preparation technology, which is a light-emitting display device prepared by using nano-rods. Due to the wide-band wavelength of nano-rods, it can emit light, has strong coordination, and high color purity. It can be formed by single light or mixed. white light. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y30/00B82Y40/00H01L33/00H01L33/04
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/883H01L33/005H01L33/04Y02B20/00
Inventor 李凤张虚谷纪丽珊张之轩张青松王凛烽
Owner NANCHANG HANGKONG UNIVERSITY
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