Quantum dot and surface modification method thereof, and quantum dot light-emitting diode

Abstract

The invention belongs to the technical field of quantum dot materials, and particularly relates to a surface modification method for a quantum dot. The surface modification method comprises the following steps: acquiring a quantum dot solution; acquiring an ammonium halide ligand precursor solution with a benzene ring; and acquiring a non-coordination solvent, mixing the quantum dot solution, the ammonium halide ligand precursor solution with the benzene ring and the non-coordination solvent, conducting reacting in an inert gas atmosphere at a preset temperature, and performing separating to obtain a modified quantum dot. According to the surface modification method for the quantum dot provided by the invention, the surface of the modified quantum dot is grafted with an ammonium halide ligand with the benzene ring, so the stability and the dispersity of the quantum dot can be remarkably improved on the premise of not influencing the optical performance of the quantum dot, and meanwhile, the transmission performance of a current carrier is improved; and thus, the fluorescence efficiency of the quantum dot is improved.

Description

technical field [0001] The invention belongs to the technical field of quantum dot materials, and particularly relates to a quantum dot and a method for surface modification thereof, and a quantum dot light-emitting diode. Background technique [0002] Quantum dots refer to semiconductor nanomaterials in which excitons are bound in three-dimensional spatial directions, and the particle size is generally 1-100 nm. Due to the existence of the "quantum confinement" effect, with the further reduction of the size of the quantum dots, the continuous energy band structure becomes a discontinuous discrete energy level structure, which can emit significant fluorescence after excitation. Quantum dots with different energy band widths can be obtained by adjusting the size of the quantum dots. Quantum dots with different energy band widths will emit photons of different energies, that is, light of different colors, under the excitation conditions of a certain wavelength. Therefore, by...

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Problems solved by technology

However, a large number of oil-soluble long-chain ligands introduced on the surface of quantum dots prepared by solution method have the following disadvantages: on the one hand, such oil-soluble long-chain ligands are usually weakly adhered to the surface of quantum dots, affected by temperature, environment, etc. Ligands will fall off due to changes in water or oxygen, leaving a large number of gaps on the surface of quantum dots, causing aggregation and precipitation between quantum dots, and greatly reducing the fluorescence efficiency

However, these coating methods are not only cumbersome, but also factors such as water, strong polar organic solvents, catalysts and other factors involved in the process will reduce the fluorescence efficiency of quantum dots to varying degrees.

At the same time, quantum dots coated with inorganic or high molecular polymers will significantly increase the size of quantum dots.

Therefore, these conventional coating methods seriously affect the optical properties of quantum dots, which greatly limits their wide application.

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