Ultrasonic-assisted method for preparing doped PbS quantum dot at low temperature in liquid phase

Abstract

The invention discloses an ultrasonic-assisted method for preparing a doped PbS quantum dot at a low temperature in a liquid phase, relating to the field of a photoelectric nano material. The method comprises the following steps of: (1) under the protection of inert gas, respectively dissolving a sulfur source and a raw material containing an element Pb and a doped element X into an organic solvent to prepare a solution A and a solution B; then heating the solution B to 50-300 DEG C and adding the solution A into the solution B to carry out ultrasonic reaction; mixing a reaction product and a solvent, and centrifuging and purifying; and dispersing a centrifugal product into a non-polar organic solvent to finish the preparation of the doped PbS quantum dot. The method disclosed by the invention has the advantages of moderate reaction conditions, uniform doping degree, good reproducibility, fast production speed, simplicity in operation, low cost and the like.

Description

technical field [0001] The invention relates to a method for preparing doped PbS quantum dots in an ultrasonic-assisted low-temperature liquid phase, and belongs to the field of optoelectronic nanomaterials. Background technique [0002] Quantum dots are a class of semiconductor nanomaterials whose geometric scale is smaller than the Bohr exciton radius, and the carrier movement is restricted in three dimensions. When the semiconductor material gradually decreases from the bulk phase to less than its Bohr exciton radius, the movement of carriers will be restricted in three dimensions, resulting in the quantization of the energy of electrons in three dimensions. Continuous energy bands are thus split and the energy bands become wider, a phenomenon known as quantum confinement. The confinement effect of quantum dots makes them have unique optical and electrical properties, so they have great application potential in optoelectronic fields such as light-emitting displays, laser...

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Problems solved by technology

R.S.Silva et al. reported the synthesis of Mn-doped PbS in silica glass templates (Journal of Alloys and Compounds.2009,483,204; J.Phys.D:Appl.Phys.2008,41,165005); 2012 Dieter Isheim et al. reported a method for synthesizing Mn-doped PbS using a gas-liquid-solid phase method (J.Phys.Chem.C2012, 116, 6595), but the above two methods need to be carried out under high temperature conditions, and the energy consumption is high. The cooling time is long, and there is a problem of uneven mixing of the reaction raw materials, which cannot guarantee the uniform doping degree of the prepared doped PbS quantum dots

Although the traditional thermal injection method (Adv. Mater. 2003, 15, 1844) can synthesize PbS quantum dots under low temperature conditions, it is difficult to synthesize doped PbS quantum dots because the doping amount is low and the raw materials containing doping elements The proportion of reactants is small, the reactivity is low, it is difficult for doping elements to enter the PbS lattice to replace Pb, and it is impossible to prepare doped PbS quantum dots

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