Nanocrystalline titanium dioxide films: Influence of ambient conditions on surface- and volume-related photoluminescence

被引：59

作者：

Preclikova, Jana ^{[1
]}

Galar, Pavel ^{[1
]}

Trojanek, Frantisek ^{[1
]}

Danis, Stanislav ^{[1
]}

Rezek, Bohuslav ^{[2
]}

Gregora, Ivan ^{[2
]}

Nemcova, Yvonne ^{[3
]}

Maly, Petr ^{[1
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, CZ-12116 Prague 2, Czech Republic

[2] Inst Phys ASCR Vvi, CZ-18221 Prague 8, Czech Republic

[3] Charles Univ Prague, Fac Sci, CZ-12801 Prague 2, Czech Republic

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 11期

关键词：

TIO2; THIN-FILMS; ANATASE TIO2; OPTICAL-PROPERTIES; TEMPERATURE-DEPENDENCE; PHONON CONFINEMENT; EXCITON EMISSION; SINGLE-CRYSTALS; SPECTROSCOPY; SIZE; NANOPARTICLES;

D O I：

10.1063/1.3512982

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on systematic study of photoluminescence properties of nanocrystalline titanium dioxide films consisting of predominantly anatase nanoparticles with diameters larger than 13 nm. We measured photoluminescence under two selected excitation wavelengths (325 nm/442 nm, i.e., above/below band gap excitation), under different values of ambient air pressure (5-10(5) Pa), and in the temperature interval 10-300 K. On basis of our results, we are able 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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3512982]

引用

页数：8

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