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Cadmium sulfide quantum point synthetized by 2-phase heating process

A technology for quantum dots and cadmium sulfide, applied in the field of two-phase thermal synthesis of cadmium sulfide quantum dots

Inactive Publication Date: 2005-03-30
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, many new materials have been synthesized by hydrothermal method and solvothermal method. However, the method of combining these two methods to form a two-phase thermal synthesis material has not been reported. Of course, using this two-phase thermal method to synthesize Cadmium sulfide quantum dots are unprecedented

Method used

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  • Cadmium sulfide quantum point synthetized by 2-phase heating process
  • Cadmium sulfide quantum point synthetized by 2-phase heating process

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Heat the mixture of 1mmol (0.2345g) cadmium acetate, 10mmol (3.8665g) TOPO and 15ml benzene at a temperature of 80-100°C until it is colorless and transparent, and after cooling to below 40°C, mix the organic solution with 15ml containing Add 0.1mmol (0.0076g) aqueous solution of thiourea to a 50ml autoclave lined with polytetrafluoroethylene, seal the autoclave and put it into the furnace to heat at 180°C for 1.5 hours. After cooling, there will be yellow vulcanization in the oil phase. Cadmium quantum dot generation. The fluorescence peak position of its benzene solution at room temperature is around 418nm, the half peak width is 23nm, and the fluorescence quantum efficiency is 36%.

Embodiment 2

[0013] Heat a mixture of 0.2mmol (0.1134g) cadmium tetradecyl carboxylate, 3.2mmol (0.891g) oleic acid and 10ml toluene at a temperature of 80-100°C until it is colorless and transparent, and after cooling to below 40°C, Add this organic solution and 10ml of aqueous solution containing 0.4mmol (0.0304g) thiourea to a 30ml autoclave with a Teflon lining, seal the autoclave and put it into the furnace to heat at 180°C for 1 hour, and after cooling In the oil phase, yellow cadmium sulfide quantum dots are generated. The fluorescence peak position of its toluene solution at room temperature is around 413nm, the half peak width is only 18nm, and the fluorescence quantum efficiency is 60%.

Embodiment 3

[0015] Heat the mixture of 0.4mmol (0.0514g) cadmium oxide, 10mmol (2.8247g) oleic acid and 40ml n-hexane at a temperature of 80-100°C until it is colorless and transparent, and after cooling to below 40°C, the organic solution Add 40ml of aqueous solution containing 4mmol (0.3000g) thioacetamide together into a 100ml autoclave lined with polytetrafluoroethylene, seal the autoclave and put it in the furnace to heat at 150°C for 0.5 hours. Yellow cadmium sulfide quantum dots are generated. The fluorescence peak position of its n-hexane solution at room temperature is around 407nm, the half-maximum width is 28nm, and the fluorescence quantum efficiency is 45%.

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Abstract

In the method, two phases system is formed under following condition: cadmium alkyl carboxylic acid containing 2-18 carbon or cadmium oxide as cadmium source; thiourea or thioacetamide as sulphur source; oleic acid or three octyl phosphine oxide (TOPO) as package agent; water in equivolume and organic compound not dissolved in water as solvent; heating 0.5-24 hours inside autoclave under 120-180 deg.C. Quantum points of cadmium sulphide in different sizes are obtained by changing reaction time. Or, quantum point near to size distribution of crystal seed in larger size is obtained by using obtained quantum point as crystal seed through reaction with new added reactive precursor. The invention realizes controllable size of quantum point, obtains quantum points in narrow distributed sizes. Light in royal purple or blue color is radiated under ultraviolet lamp. quantum efficiency is 3-60%.

Description

technical field [0001] The invention belongs to a two-phase thermal method for synthesizing cadmium sulfide quantum dots. Background technique [0002] Due to the quantum size effect, semiconductor quantum dots, especially II-VI semiconductor quantum dots, exhibit size-dependent optical properties that are different from bulk materials, and this property can be applied to the preparation of light-emitting diodes, solar cells, single-electron Therefore, the synthesis of size-controllable semiconductor quantum dots has become the focus of extensive research in recent years. The optical properties of semiconductor quantum dots are related to their size distribution, that is, the narrower the size distribution, the purer the light emitted by semiconductor quantum dots. This high-purity luminescence is very important in the application of semiconductor quantum dots. Therefore, the synthesis of high-quality semiconductor quantum dots with narrow size distribution is the goal purs...

Claims

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Application Information

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IPC IPC(8): C01G11/02H01L31/18H01L33/00H01S5/00
CPCY02P70/50
Inventor 王强潘道成姬相玲蒋世春安立佳
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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