Umfang:
1 Online-Ressource (XII, 108, xxiii Seiten; 8796 KB)
Inhalt:
Frequency upconversion nanoparticles (UCNPs) are inorganic nanocrystals capable to up-convert incident photons of the near-infrared electromagnetic spectrum (NIR) into higher energy photons. These photons are re-emitted in the range of the visible (Vis) and even ultraviolet (UV) light. The frequency upconversion process (UC) is realized with nanocrystals doped with trivalent lanthanoid ions (Ln(III)). The Ln(III) ions provide the electronic (excited) states forming a ladder-like electronic structure for the Ln(III) electrons in the nanocrystals. The absorption of at least two low energy photons by the nanoparticle and the subsequent energy transfer to one Ln(III) ion leads to the promotion of one Ln(III) electron into higher excited electronic states. One high energy photon will be emitted during the radiative relaxation of the electron in the excited state back into the electronic ground state of the Ln(III) ion. The excited state electron is the result of the previous absorption of at least two low energy photons. [...]
Anmerkung:
Kumulative Dissertation
,
Dissertation Universität Potsdam 2022
Weitere Ausg.:
Erscheint auch als Druck-Ausgabe Bastian, Philipp U. Core-shell upconversion nanoparticles - investigation of dopant intermixing and surface modification Potsdam, 2022
Sprache:
Englisch
Schlagwort(e):
Nanopartikel
;
Aufwärtskonversion
;
Lanthanoide
;
Photon
;
Angeregter Zustand
;
Photolumineszenz
;
Quantenausbeute
;
Dispersion
;
Kern-Schale-Struktur
;
Laserspektroskopie
;
Hochschulschrift
DOI:
10.25932/publishup-55160
URN:
urn:nbn:de:kobv:517-opus4-551607
URL:
https://doi.org/10.25932/publishup-55160
URL:
https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-551607
URL:
https://d-nb.info/1261294645/34
Mehr zum Autor:
Kumke, Michael Uwe 1963-
Mehr zum Autor:
Taubert, Andreas 1972-
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