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Title

Evidencing early pyrochlore formation in rare-earth doped TiO2 nanocrystals: Structure sensing via VIS and NIR Er3+ light emission

AuthorsCamps, I. CSIC ORCID; Borlaf, Mario CSIC ORCID; Toudert, Johann CSIC ORCID; Andrés, Alicia de CSIC ORCID; Colomer, María T. CSIC ORCID ; Moreno, Rodrigo; Serna, Rosalía CSIC ORCID
KeywordsNanocrystals
Optical properties-photoluminescence
Crystal structures
Rare-earth doping- erbium
TiO2
Titanium dioxide compounds-pyrochlore
Issue Date24-Nov-2017
PublisherElsevier
CitationJournal of Alloys and Compounds 735: 2267-2274 (2018)
AbstractEr doping of TiO colloidal nanocrystals enhances their performance for photo-induced applications. Such doping is known to delay the anatase to rutile transformation under thermal treatment; nonetheless relevant information on the Er light emission and location within the TiO structures is still incomplete. Er photoluminescence emission both in the visible (upconverted) and infrared photoluminescence is used for the first time to probe the ions location within the different TiO structures. The results show that Er ions in the as-prepared xerogels are not embedded in the anatase crystallites, and only upon thermal treatment Er diffusion is induced into crystal interstitial positions to form a solid solution. At higher temperatures rutile is formed inducing Er segregation and giving rise to the formation of pyrochlore (ErTiO), as shown by a distinct emission in the infrared spectrum due to the Er ions located within the pyrochlore compound. Although pyrochlore is usually a high temperature phase, analysis of the photoluminescence allows its labeling at temperatures as low as 600–700 °C for small Er concentrations (1 mol %). Increasing Er concentration promotes its enrichment at the nanocrystallites surface accomplished by the anatase-to-rutile phase transformation, suggesting that Er ions control the TiO nanocrystals surface properties.
Description8 pags., 6 figs.
Publisher version (URL)https://doi.org/10.1016/j.jallcom.2017.11.262
URIhttp://hdl.handle.net/10261/189940
DOI10.1016/j.jallcom.2017.11.262
Identifiersdoi: 10.1016/j.jallcom.2017.11.262
issn: 0925-8388
Appears in Collections:(ICMM) Artículos
(ICV) Artículos
(CFMAC-IO) Artículos

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