Preliminary study on singlet oxygen production using CeF.sub.3./sub.:Tb.sup.3+./sup.@SiO.sub.2./sub.-PpIX.

0470068 - FZÚ 2017 RIV GB eng J - Journal Article
Popovich, K. - Procházková, L. - Pelikánová, I.T. - Vlk, M. - Palkovský, M. - Jarý, Vítězslav - Nikl, Martin - Múčka, V. - Mihóková, Eva - Čuba, V.
Preliminary study on singlet oxygen production using CeF₃:Tb³⁺@SiO₂-PpIX.
Radiation Measurements. Roč. 90, Jul (2016), s. 325-328. ISSN 1350-4487. E-ISSN 1879-0925.
[International Conference on Luminescent Detectors and Transformers of Ionizing Radiation (LUMDETR). Tartu (Estonsko), 20.09.2015-25.09.2015]
R&D Projects: GA ČR GA13-09876S; GA ČR GA13-28721S
Institutional support: RVO:68378271
Keywords : singlet oxygen * cerium fluoride * photodynamic therapy * biofunctionalization * scintillator
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.442, year: 2016

Luminescent properties and singlet oxygen production using with SiO2 and protoporphyrin IX (PpIX) were studied. CeF3:Tb3þ nanopowder was prepared via sol-gel route, with subsequent surface coating by SiO2 layer and the conjugation with photosensitive PpIX molecules. Radioluminescence spectra suggest an energy transfer from Ce3+ to Tb3+ ions and from Tb3+ to molecules of PpIX photosensitizer. The energy transfer was confirmed by photoluminescence decay curves. Singlet oxygen production was detected using a reaction of 1O2 with 3’-(p-aminophenyl) fluorescein (APF) chemical probe after X-Ray excitation.Qualitative changes in time resolved photoluminescence spectra in the region of 520 nm indicate 1O2 generation. Studied nanocomposites may be good candidates for the application in X-ray induced photodynamic therapy.

Permanent Link: http://hdl.handle.net/11104/0267803