Izvestiya of Saratov University.
ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)


upconversion particles

Effect of the Temperature of NaYF4 : Er,Yb Upсonversion Particles on the Formation of Luminescence

The intensity of upconversion luminescence depends nonlinearly on the excitation intensity. The aim of this work is to study the effect of the temperature of NaYF4:Er,Yb upconversion particles on the dependence of the luminescence intensity on the excitation intensity. The synthesized particles were observed to have the shape of a hexagonal prism with a width of about 440 nm and a height of 445 nm. The upconversion luminescence spectra were obtained in the temperature range of 22–55° C with the excitation intensity in the range of 1.5–9.4 W/cm2.

Toxicity of Upconversion Nanoparticles. Overview

Background and Objectives: The object of the study was the toxicity of upconversion nanoparticles. The aim is to overview the literature on the toxicity of various types of upconversion nanoparticles and to search for their maximum permissible concentration when administered to laboratory animals in vivo. Materials and Methods: The approach used has been the analysis of recent publications on the topic.

Effect of the temperature of NaYF4:Er,Yb upconversion particles on the formation of luminescence

The intensity of upconversion luminescence depends nonlinearly on the pump power intensity. The study of the dependence under various conditions is important, since it allows us to analyze the changes in the mechanisms of formation of the upconversion luminescence. The aim of this work is to study the effect of the temperature of NaYF4:Er,Yb upconversion particles on the dependence of the luminescence intensity on the intensity of the exciting radiation.

Prospects For Application of Upconversion Particles NaYF4:Er,Yb for Phototherapy

Background and Objectives: Functionalized upconversion particles allow for photodynamic and photothermal therapy of tumor with simultaneous temperature monitoring and visualization of the area of treatment. Upconversion particles can increase the depth of therapeutic effects due to the high penetration depth of the required excitation radiation. That is why they are a promising material for the combined phototherapy and simultaneous monitoring of biological tissue heating.