Photoluminescence of anatase and rutile TiO2 particles.
J Phys Chem B
; 110(50): 25366-70, 2006 Dec 21.
Article
em En
| MEDLINE
| ID: mdl-17165983
ABSTRACT
Nonaqueous reactions between titanium(IV) chloride and alcohols (benzyl alcohol or n-butanol) were used for the synthesis of anatase TiO2 particles, while rutile TiO2 particles were synthesized in aqueous media by acidic hydrolysis of titanium(IV) chloride. The X-ray diffraction measurements proved the exclusive presence of either the anatase or the rutile phase in prepared samples. The photoluminescence of both kinds of particles (anatase and rutile) with several well-resolved peaks extending in the visible spectral region was observed, and the quantum yield at room temperature was found to be 0.25%. Photon energy up-conversion from colloidal anatase and rutile TiO2 particles was observed at low excitation intensities. The energy of up-converted photoluminescence spans the range of emission of normal photoluminescence. The explanation of photon energy up-conversion involves mid-gap energy levels originating from oxygen vacancies.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Titânio
/
Nanoestruturas
/
Medições Luminescentes
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
J Phys Chem B
Assunto da revista:
QUIMICA
Ano de publicação:
2006
Tipo de documento:
Article