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Synthetic method for core-shell quantum dot which is capable of realizing emission of blue light to green light and possesses uniformly-alloyed core

A core-shell quantum dot and synthesis method technology, which is applied in the field of core-shell quantum dot synthesis, can solve the problems of difficult synthesis control, high energy consumption in high-temperature reactions, environmental pollution, etc., and achieve good green chemical characteristics and economical efficiency. Simplified operation procedures, easy and reliable operation

Active Publication Date: 2015-04-08
HEFEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing synthesis method has the following disadvantages: 1. The existing method is difficult to achieve uniform alloying economically, and most of the synthesized quantum dots have a structure with a certain gradient composition; 2. The hot injection method is limited by heat transfer and mass transfer. Difficult to be used in large-scale synthesis; 3. High-temperature reactions above 300°C require high energy consumption, making synthesis control difficult; 4. The phosphine method is expensive and environmentally polluting
[0004] Using a one-pot heating method in a phosphine-free system, at a relatively low temperature, such as below 240 ° C, the reaction synthesizes uniformly alloyed CdSe x S 1-x quantum dots, which have not yet been successfully developed

Method used

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  • Synthetic method for core-shell quantum dot which is capable of realizing emission of blue light to green light and possesses uniformly-alloyed core
  • Synthetic method for core-shell quantum dot which is capable of realizing emission of blue light to green light and possesses uniformly-alloyed core
  • Synthetic method for core-shell quantum dot which is capable of realizing emission of blue light to green light and possesses uniformly-alloyed core

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Synthesis of CdSe in octadecene medium 0.2 S 0.8 / CdS quantum dots

[0035]Add 0.200 mmol of cadmium stearate, 0.040 mmol of selenium powder, 0.160 mmol of diallyl disulfide (with S as the metering unit), 0.20 mmol of oleic acid, and 9.60 grams of octadecene into the reaction flask. Purge with argon gas at room temperature for 5 minutes, then heat to 210°C at a rate of 20°C / min, keep warm for 20 minutes, and stop heating; when the temperature of the reaction solution drops below 100°C, add 0.200 cadmium stearate to the reaction bottle mmol and diallyl disulfide 0.180mmol, heated to 195°C at a rate of 7°C / min, kept for 30min, and stopped heating. When the temperature of the reaction solution dropped below 70°C, pour the reaction solution into 50mL anhydrous In ethanol, the quantum dots were precipitated, and then using absolute ethanol as a non-solvent and cyclohexane as a solvent, the quantum dots were dissolved and precipitated three times, and CdSe was...

Embodiment 2

[0037] Embodiment 2: Synthesis of CdSe in liquid paraffin medium 0.3 S 0.7 / CdS quantum dots

[0038] Add 0.200 mmol of cadmium stearate, 0.060 mmol of selenium powder, 0.140 mmol of diallyl disulfide (with S as the metering unit), 0.20 mmol of oleic acid, and 9.60 grams of liquid paraffin into the reaction flask. Purge with argon gas at room temperature for 5 minutes, then heat to 210°C at a rate of 20°C / min, keep warm for 20 minutes, and stop heating; when the temperature of the reaction solution drops below 100°C, add 0.200 cadmium stearate to the reaction bottle mmol and diallyl disulfide 0.190mmol, heated to 195°C at a rate of 7°C / min, kept for 30min, and stopped heating. When the temperature of the reaction solution dropped below 70°C, pour the reaction solution into 50mL In the mixture of ethanol and acetone (volume ratio 3:1), the quantum dots were precipitated, and then using absolute ethanol as the non-solvent and cyclohexane as the solvent, the quantum dots were d...

Embodiment 3

[0040] Embodiment 3: Synthesis of CdSe in octadecene medium 0.4 S 0.6 / CdS quantum dots

[0041] Add 0.200 mmol of cadmium stearate, 0.080 mmol of selenium powder, 0.120 mmol of diallyl disulfide (with S as the metering unit), 0.20 mmol of oleic acid, and 9.60 grams of octadecene into the reaction flask. Purge with argon gas at room temperature for 5 minutes, then heat to 210°C at a rate of 20°C / min, keep warm for 20 minutes, and stop heating; when the temperature of the reaction solution drops below 100°C, add 0.200 cadmium stearate to the reaction bottle mmol and diallyl disulfide 0.190mmol, heated to 195°C at a rate of 7°C / min, kept for 30min, and stopped heating. When the temperature of the reaction solution dropped below 70°C, pour the reaction solution into 50mL In ethanol, the quantum dots were precipitated, and then using absolute ethanol as a non-solvent and cyclohexane as a solvent, the quantum dots were dissolved and precipitated three times, and CdSe was obtained...

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Abstract

The invention discloses a synthetic method for a core-shell quantum dot which is capable of realizing emission of blue light to green light and possesses a uniformly-alloyed core. The core-shell quantum dot employs uniformly-alloyed cadmium selenide sulfide CdSexS1-x as a core and employs CdS as a shell, and the composition is shortly named CdSexS1-x / CdS, wherein x=0.05-0.60. By controlling the molar ratio of a sulfur source to a selenium source, the usage amount of a cadmium source and a ligand, and the reaction temperature and time in the synthesis process of the core-shell quantum dot, the emission peak wavelength of the core-shell quantum dot is continuously adjustable in the scope of 460-530 nm. The synthetic method has green and economic characteristics, the synthesis process and the product structure and performances are highly controllable, and the method is applicable to large-scale preparation of the quantum dot.

Description

1. Technical field [0001] The invention relates to a synthesis method of quantum dots, in particular to a synthesis method of core-shell quantum dots with blue to green light emission and uniform alloyed core. 2. Background technology [0002] Quantum dots are one of the research hotspots of optoelectronic materials due to their composition-dependent light emission properties. Due to the good color saturation (narrow half-width) and stability of quantum dots, they have good application prospects in display technology. Among the three primary color display elements of blue, green and red, red light CdSe quantum dots are the most well-researched and have reached a good research level; compared with red light CdSe quantum dots, research on blue and green light quantum dots is not yet sufficient, and there are still some problems. Blue light emission is currently mainly realized by CdS and ZnSe quantum dots. CdS quantum dots can emit up to 480nm, and ZnSe quantum dots can emit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y40/00
Inventor 蒋阳张忠平蓝新正常亚婧姚旭东李国鹏王辉
Owner HEFEI UNIV OF TECH
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