Method for improving quantum dot luminescence through core-shell structural nanoparticles

A quantum dot luminescence and nanoparticle technology, which is applied in nano optics, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem that quantum dot luminescence behavior is not obtained, and achieve simple preparation methods and raw materials, and improve Optical behavior and the effect of widening the range of applications

Inactive Publication Date: 2017-06-30
XIAMEN SPEC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current system is mainly used in the system of fluorescent molecules. The regulation of quantum dot luminescence behavior has not yet obtained considerable enhancement results, only a few tens of times. It is very important to enhance the method of fluorescent signal, and then obtain a higher degree of enhanced luminescence ability

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  • Method for improving quantum dot luminescence through core-shell structural nanoparticles
  • Method for improving quantum dot luminescence through core-shell structural nanoparticles
  • Method for improving quantum dot luminescence through core-shell structural nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of a core-shell nanoparticle:

[0034] figure 1 A schematic diagram of the experimental flow for core-shell nanoparticles is given.

[0035] Take thin-layer silica-coated silver core-shell nanoparticles as an example. Its specific preparation method is:

[0036] Take 200 mL of 0.01% chloroauric acid aqueous solution, heat it to boiling under stirring conditions, then add 1.6 mL of 1% sodium citrate aqueous solution, and keep boiling slightly for 50 min, the solution gradually turns brownish red, Allow it to react completely and cool down to room temperature naturally to obtain a gold nanoparticle sol with a diameter of about 45±10 nm. Take 10 mL of gold nanoparticle sol as a seed, dilute it ten times, and gradually add 4 mL of 20 mM silver nitrate into the seed solution containing a certain amount of sodium citrate and ascorbic acid to obtain silver-coated gold with a particle size of 150±10 nm. Nanoparticles. Take the above silver-coated gold nanoparti...

Embodiment 2

[0039] Detection of enhanced fluorescence of core-shell nanoparticles on glass flake-assembled quantum dots.

[0040] Synthesis of oil-phase CdSe nanoparticles and a novel inorganic perovskite CsPbBr by high-temperature hot-injection method 3 quantum dots, Figure 3A Fluorescence photos and transmission electron microscope images of oil-phase CdSe quantum dots, Figure 3B Inorganic CsPbBr 3 Fluorescence photographs and transmission electron microscope images of quantum dots. The particle size of CdSe quantum dots in the figure is -3.7 nm, CsPbBr 3 Particle Size - 8 nm.

[0041] Quantum dots were assembled by chemical adsorption method / LB film / spin-coating / dip-coating. The specific implementation is as follows. The surface of the glass substrate is aminated with aminosilane, and the aminated substrate is soaked in a solution containing quantum dots. Due to the ligand exchange between the amino group and the quantum dots, the quantum dots are thus adsorbed on the surface o...

Embodiment 3

[0044] Detection of enhanced fluorescence of gold flake-assembled quantum dots by core-shell nanoparticles.

[0045] The gold film is constructed by thermally evaporating a gold layer / magnetron sputtering gold layer / and single crystal Au(111) with a thickness of about 200 nm on the surface of the silicon wafer. The silicon wafer is cleaned by Piranhas Solution (H 2 SO 4 :H 2 o 2 -1:2), toluene / isopropanol (1:1), acetone / isopropanol (1:1), ethanol, ultrapure water for ultrasonic cleaning. In order to avoid self-quenching caused by energy transfer in direct contact between the quantum dots and the gold film, we deposited a nanometer-thick aluminum oxide dielectric layer on the surface of the gold film using atomic layer deposition technology, which can effectively avoid the quenching phenomenon caused by direct contact, and at the same time The thick aluminum oxide layer will not interfere with the coupling phenomenon of the system.

[0046] Chemical adsorption method: immer...

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Abstract

The invention discloses a method for improving quantum dot luminescence through core-shell structural nanoparticles. The core-shell structural nanoparticles are characterized in that a local strong electromagnetic field on the surface is capable of improving the quantum dot luminescence performance, and an inertia shell layer is able to effectively prevent metal nanoparticles and quantum lots from contacting to lead to fluorescence quenching, so that the quantum dot luminescence effect can be obviously improved by dozens fold and even by thousands fold. The method is characterized in that a quantum dot film is prepared through a method disclosed in the prior art, and then the core-shell structural nanoparticles are dispersed on the film surface under the room-temperature condition, so that the quantum dot luminescence can be quickly obviously improved. The experimental improving method is simple, easy to carry out, free from pollution, high in generality, and high in operability; the principle and the method are applicable to an LED, a solar cell, a nano laser, a photovoltaic infrared detector, a single electron transistor, etc.

Description

technical field [0001] The invention relates to a method for enhancing luminescence, in particular to a method for enhancing quantum dot luminescence with core-shell structure nanoparticles. Background technique [0002] Fluorescence is a photoluminescent phenomenon, but traditional fluorescent molecules have disadvantages such as poor stability, wide luminous half-peak width, and low fluorescence efficiency; while quantum dots have strong photobleaching resistance, high fluorescence efficiency, narrow luminous half-peak width, etc. It has been widely used in biological analysis, photoelectric conversion and other fields. However, after the film is assembled, its luminescent behavior will have a strong attenuation due to the potential energy loss between the substrate and the substrate, which greatly limits its application in devices. Using rough gold-silver substrates or surface plasmon-enhanced fluorescence technology of gold-silver nanoparticles can effectively regulate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/66C09K11/02B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/883B82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/665
Inventor 李剑锋殷昊程春晓
Owner XIAMEN SPEC TECH CO LTD
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