Nanocrystalline titanium dioxide films: influence of ambient conditionson surface- and volume-related photoluminescence

0353095 - FZÚ 2011 RIV US eng J - Journal Article
Preclíková, J. - Galář, P. - Trojánek, F. - Daniš, S. - Rezek, Bohuslav - Gregora, Ivan - Němcová, Y. - Malý, P.
Nanocrystalline titanium dioxide films: influence of ambient conditionson surface- and volume-related photoluminescence.
Journal of Applied Physics. Roč. 108, č. 11 (2010), 113502/1-113502/8. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA AV ČR KAN400100701; GA AV ČR KAN301370701; GA ČR GD202/09/H041
Institutional research plan: CEZ:AV0Z10100521; CEZ:AV0Z10100520
Keywords : titanium dioxide * photoluminescence * nanocrystalline films
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.064, year: 2010

Study of photoluminescence properties of nanocrystalline titanium dioxide films consisting of predominantly anatase nanoparticles with diameters larger than 13 nm. Photoluminescence was measured two excitation wavelengths: 325 nm/442 nm,(above/below band gap excitation) under different values of ambient air pressure 5–105 Pa, and in the temperature interval 10–300 K. The results allow us to distinguish two different processes leading to photoluminescence: the exciton recombination and the recombination of carriers in the energy states related to the surface of nanocrystals. We propose microscopic models describing well the effects of temperature and ambient conditions on photoluminescence of nanocrystalline titanium dioxide films.
Permanent Link: http://hdl.handle.net/11104/0192435