Towards new visible light sources utilizing upconversion nanoparticles
Fedotov, Andrei (2017)
Diplomityö
2017
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201705226723
https://urn.fi/URN:NBN:fi-fe201705226723
Tiivistelmä
This work is devoted to the study of the luminescent properties of upconversion nanoparticles and optical fibers doped with upconversion nanoparticles. The host matrices of the two types of investigated nanoparticles refer to oxides and fluorides. Both types contain Yb and Er ions, but in different concentrations. Continuous wave and pulsed pump sources of radiation at 980 and 915 nm were used for excitation of upconversion nanoparticles.
It was demonstrated that the host matrix and the concentration of lanthanide ions significantly affect the emission spectrum of upconversion nanoparticles. The degradation and saturation of luminescence in upconversion nanoparticles is revealed. The justification of these effects was proposed. In addition, the luminescence measurements of world-first optical fibers doped with upconversion nanoparticles were performed.
The results of structural studies of upconversion nanoparticles and optical fibers doped with upconversion nanoparticles using scanning and transmission electron microscopy are presented.
It was demonstrated that the host matrix and the concentration of lanthanide ions significantly affect the emission spectrum of upconversion nanoparticles. The degradation and saturation of luminescence in upconversion nanoparticles is revealed. The justification of these effects was proposed. In addition, the luminescence measurements of world-first optical fibers doped with upconversion nanoparticles were performed.
The results of structural studies of upconversion nanoparticles and optical fibers doped with upconversion nanoparticles using scanning and transmission electron microscopy are presented.