Title: NaOH-controlled upconversion of nanocrystalline BaZrO3:Er,Yb phosphor

Authors: L.A. Diaz-Torres; P. Salas; J. Oliva; E. De la Rosa; C. Angeles-Chavez; V.M. Castaño

Addresses: Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., León, Gto. 37150, México ' Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, A.P. 1-1010, Querétaro, Qro. 76000, México ' Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., León, Gto. 37150, México ' Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (EMANA), Centro de Investigaciones en Optica A. C., León, Gto. 37150, México ' Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas # 152, C.P. 07730, México D.F., Mexico ' Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, A.P. 1-1010, Querétaro, Qro. 76000, México

Abstract: Strong green and red upconversion emissions of Er3+ in nanocrystalline BaZrO3:Yb,Er are observed. Powder samples were obtained by a simple hydrothermal process at 100°C under different NaOH molar concentrations and annealed in air at 1000°C for 3 h. Band gap and luminescence depend on precipitant molar concentration. Faceted single-phase BaZrO3 secondary particles were obtained for precipitant concentrations of 1.0 M, whereas for other precipitant concentrations, ZrO2 segregation was observed.

Keywords: hydrothermal synthesis; barium zirconate; nanocrystalline BaZrO3; upconversion emission; ytterbium; erbium; band gap; luminescence; sodium hydroxide; NaOH; nanotechnology.

DOI: 10.1504/IJNT.2013.058564

International Journal of Nanotechnology, 2013 Vol.10 No.12, pp.1055 - 1063

Published online: 07 Jan 2014 *

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