Red light enhanced core-shell upconversion luminescent nano-carrier and preparation method therefor

Abstract

The invention provides a red light enhanced core-shell upconversion luminescent nano-carrier and a preparation method therefor. The material has the chemical expression of NaGdF4:Yb,Er,Mn@NaGdF4:Yb@gel, wherein @ represents coating, and gel represents gelatin. The material provided by the invention is technically characterized in that homogeneous and monodisperse nanocrystals are produced by adopting a high-temperature pyrolysis method, which is environment-friendly and is easy and feasible in operation, and hydrophobic surfaces of nanoparticles are coated with gelatin by adopting a self-assembly method, so as to form NaGdF4:Yb,Er,Mn@NaGdF4:Yb@gel, of which the surface is hydrophilic and has a large number of active groups. The nano composite material prepared by the scheme has a red light enhanced luminescence property, maintains relatively strong luminescence total intensity and has a hydrophilic surface with a large number of active groups. The nano-carrier has enhanced red light emission and relatively strong fluorescence intensity and meanwhile has a hydrophilic active surface, thereby being capable of serving as an excellent photosensitizer carrier.

Description

technical field [0001] The invention relates to a core-shell up-conversion luminescent nano-carrier. The invention also relates to a method for preparing a core-shell up-conversion luminescent nanocarrier. Background technique [0002] Rare earth oxides have good chemical stability, high mechanical strength, and high laser damage threshold, but the phonon energy of oxides is too high, resulting in low luminous efficiency of oxides doped with rare earth ions; and rare earth fluorides have low The phonon energy, the probability of non-radiative transition is small, and the doping concentration is high. It is a good matrix for rare earth ions, and has potential broad application prospects in the field of luminescent materials. [0003] The main synthesis methods of traditional nanomaterials are solid-phase method and liquid-phase method, among which the liquid-phase method is widely used because of its safe operation, simple equipment, and relatively uniform products. Liquid-...

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Problems solved by technology

[0005] In summary, there is no report or route for preparing high-performance multifunctional rare-earth fluoride nanocarriers with red-light enhancement, which is of general significance and applicable to the liquid phase method.

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