A kind of plasmon-enhanced upconversion luminescent nanoparticle and its preparation method and application

Abstract

The invention discloses a plasmon-enhanced up-conversion luminescent nanoparticle, a preparation method and an application thereof. The plasmon-enhanced upconversion luminescent nanoparticles of the present invention include gold nanosphere groups and Gd wrapped gold nanosphere groups 2 o 3 Nanoparticles; the gold nanosphere group is composed of 38-119 gold nanospheres, and the particle size of the gold nanospheres is 5-15nm; the Gd 2 o 3 Nanoparticles doped with metal ions Yb 3+ and Ln 3+ . by Gd 2 o 3 :Yb 3+ / Ln 3+ The nanoparticles wrap the gold nanosphere group, and under the condition that the gold nanosphere itself has a plasmon resonance wavelength of 538nm, the gold nanosphere group will produce two other resonance peaks in the near-infrared region. The excitation field enhancement effect induced by SPR, the Purcell effect and the quenching effect are mutually synergistic and competitive, which effectively enhances the emission intensity of the upconversion and improves the luminous efficiency of the upconversion.

Description

A kind of plasmon-enhanced upconversion luminescent nanoparticle and its preparation method and application technical field The present invention relates to the technical field of up-conversion materials, more specifically, to a kind of plasmon-enhanced up-conversion luminescence Nanoparticles and preparation methods and applications thereof. Background technique Upconversion luminescent materials have attracted much attention in biomedical research due to their large Stokes shift and optical imaging sensitivity. the attention of researchers in the field. Among them, Gd 2 O 3 :Yb 3+ / Ln 3+ (Ln=Er,Ho,Tm) nanoparticles have simple preparation process, Large absorption cross section around 980nm and Gd 3+ Ions can simultaneously act as NMR generators with high longitudinal relaxation rates. It has become one of the upconversion luminescent materials with good medical imaging prospects. However, the difference between sensitizers and activators In...

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Problems solved by technology

[0006] The present invention provides a kind of plasmon-enhanced upconversion luminescent nanoparticle to overcome the defect of weak upconversion luminescence efficiency described in the above-mentioned prior art, and the nanoparticle of the present invention is Gd coated with gold nanosphere group (AuNSA) 2 o 3 :Yb 3+ / Ln 3+ Nanoparticles, through the excitation field enhancement effect induced by SPR, the Purcell effect and the quenching effect cooperate and compete with each other to effectively enhance the intensity of the upconversion emission

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