Excited light regulated red-green emitting rare earth up-conversion nanoparticle and preparation method thereof

Abstract

The invention discloses an excited light regulated red-green emitting rare earth up-conversion nanoparticle and a preparation method thereof. The excited light regulated red-green emitting rare earthup-conversion nanoparticle emits red fluorescence under excitation of a 980 nm laser and emits green fluorescence under excitation of a 800 nm laser; the nanoparticle is a four-layer core-shell structure and comprises, from the inside to the outside, an activator layer, an energy transfer agent layer, a sensitizer layer, and a passivation layer; and chemical expression is NaErF4:Yb, Tm@NaYF4:Yb@NaNdF4:Yb@NaYF4. By adjusting doping concentration of different ions in the core-shell structure of the rare earth up conversion nanoparticle, the rare earth up-conversion nanoparticle emits different colors of fluorescence along with change of wavelength of the excited light; the rare earth up-conversion nanoparticle prepared by the invention has the characteristics of simple preparation, easy availability of raw materials, excellent optical properties and the like, and has broad application prospects.

Description

technical field [0001] The invention relates to the field of nanoparticles, in particular to a preparation method of rare earth up-conversion nanoparticles, the nanoparticles of which can emit red and green light under the excitation of adjustable excitation light. Background technique [0002] Rare-earth upconversion nanoparticles (UCNPs) are a new class of fluorescent probe materials that absorb long-wavelength low-energy photons and emit short-wavelength high-energy photons, and have many unique advantages, such as excellent optical stability, high chemical stability, low In addition, under the excitation of near-infrared light, it has many advantages such as deep tissue penetration ability, no damage to biological tissues, almost zero background fluorescence interference, and high imaging sensitivity. It has broad application prospects in biomedicine. Zhao Yuliang et al. applied the upconversion nanoparticles prepared by the hydrothermal method. By adjusting the doping a...

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Problems solved by technology

However, there are no reports of rare-earth upconversion nanoparticles that emit red and green fluorescence under different laser excitations.

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