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The optical absorption and photoluminescence of anatase and rutile TiO2 were studied at room temperature. TiO2 nanocrystalline powders were synthesized in the form of pure anatase or rutile. The samples were characterized by X-ray diffraction, X-ray fluorescence, Raman spectroscopy, optical absorption and photoluminescence (PL) methods. The PL spectra were studied under the intensive UV (3.68 eV) laser excitation. Some interesting features in the PL spectra including the well-resolved peaks of excitonic and band-band transitions in TiO2 were observed, to our knowledge, for the first time. It is shown that PL bands including peaks at 2.71―2.81 eV and its phonon replicas in anatase and rutile TiO2 arise from the excitonic e- ―h+ recombination via oxygen vacancies. The excitonic peak at 2.91 eV is attributed to the recombination of self-trapped excitons in anatase or free excitons in rutile TiO2. The PL peaks within 3.0―3.3 eV in anatase TiO2 are ascribed to indirect allowed transitions due to the band-band e- ―h+ recombination. The peaks at 3.03 eV and 3.26 eV are attributed to the free exciton emission near the fundamental band edge of rutile and anatase TiO2, respectively. The influence of TiO2 crystal structure and calcination temperature on the PL spectra is discussed.

Titel:	Room temperature photoluminescence of anatase and rutile TiO2 powders
Autor/in / Beteiligte Person:	KERNAZHITSKY, L ; SHYMANOVSKA, V ; GAVRILKO, T ; NAUMOV, V ; FEDORENKO, L ; KSHNYAKIN, V ; BARAN, J
Link:	View record from ScienceDirect (Volltext) View record from PASCAL Archive
Zeitschrift:	Journal of luminescence, Jg. 146 (2014), S. 199-204
Veröffentlichung:	Amsterdam: Elsevier, 2014
Medientyp:	academicJournal
Umfang:	print, 43 ref
ISSN:	0022-2313 (print)
Schlagwort:	Atomic molecular physics Physique atomique et moléculaire Condensed state physics Physique de l'état condensé Sciences exactes et technologie Exact sciences and technology Physique Physics Etat condense: structure electronique, proprietes electriques, magnetiques et optiques Condensed matter: electronic structure, electrical, magnetic, and optical properties Etats électroniques Electron states Excitons et phénomènes associés Excitons and related phenomena Propriétés optiques, spectroscopie et autres interactions de la matière condensée avec les particules et le rayonnement Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Propriétés optiques des matériaux massifs et des couches minces Optical properties of bulk materials and thin films Constantes optiques: indice de réfraction; constante diélectrique complexe; coefficients d'absorption, de réflexion et de transmission; émissivité Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity Photoluminescence Domaines interdisciplinaires: science des materiaux; rheologie Cross-disciplinary physics: materials science; rheology Science des matériaux Materials science Nanomatériaux et nanostructures : fabrication et caractèrisation Nanoscale materials and structures: fabrication and characterization Matériaux nanocristallins Nanocrystalline materials Absorption optique Optical absorption Absorción óptica Autopiégeage Self trapping Autocaptura Calcination Diffraction RX XRD Excitation Exciton Excitons Fluorescence RX X ray fluorescence Fluorescencia RX Lacune Vacancies Nanocristal Nanocrystal Oxyde de titane Titanium oxide Titanio óxido Phonon Phonons Rayonnement UV Ultraviolet radiation Spectre Raman Raman spectra Spectre absorption Absorption spectra Structure cristalline Crystal structure Transition permise Allowed transition Transición permitida TiO2 Anatase Rutile Titanium dioxide
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Article File Description: text Language: English Author Affiliations: Institute of Physics, National Academy of Sciences of Ukraine, 46 Prospect Nauki, Kiev 03028, Ukraine ; Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45Prospect Nauki, Kiev 03028, Ukraine ; Sumy State University, 2 Rymsky-Korsakov Str., Sumy 40007, Ukraine ; Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 2 Okolna, Str., 50-950 Wroclaw, Poland Rights: Copyright 2015 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: Physics and materials science ; Physics of condensed state: electronic structure, electrical, magnetic and optical properties

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Room temperature photoluminescence of anatase and rutile TiO2 powders