CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors

A family of ErIII and ErIII–YbIII based nanophosphors, hosted in monophasic oxidic CeIV–GdIII binary solid solutions, was prepared. The samples were formulated with a constant ErIII content as the activator, with the eventual addition of YbIII as a sensitizer. The amorphous Ce0.94−xGdxEr0.06(OH)CO3⋅...

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Detalles Bibliográficos
Autor principal:	Barja, Beatriz Carmen
Publicado:	2017
Materias:	energy transfer lanthanides luminescence photochemistry solid-state structures
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14394235_v18_n10_p1407_Sorbello http://hdl.handle.net/20.500.12110/paper_14394235_v18_n10_p1407_Sorbello
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_14394235_v18_n10_p1407_Sorbello
record_format	dspace
spelling	paper:paper_14394235_v18_n10_p1407_Sorbello2023-06-08T16:16:00Z CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors Barja, Beatriz Carmen energy transfer lanthanides luminescence photochemistry solid-state structures A family of ErIII and ErIII–YbIII based nanophosphors, hosted in monophasic oxidic CeIV–GdIII binary solid solutions, was prepared. The samples were formulated with a constant ErIII content as the activator, with the eventual addition of YbIII as a sensitizer. The amorphous Ce0.94−xGdxEr0.06(OH)CO3⋅H2O and Ce0.94−xGdxEr0.05Yb0.01(OH)CO3⋅H2O precursors were prepared by following the urea method to obtain monodispersed spheres of tunable size ranging from 30 to 450 nm. After being decomposed at 1273 K under an atmosphere of air, the precursors of 200 nm in diameter evolved into monophasic polycrystalline particles preserving the parent shape and size. The role of the composition of the binary matrices in the emission properties was evaluated for two different excitation wavelengths (976 nm and 780 nm) based on the upconversion (UC) emission spectra and their dependence on the incident power. The yield of the UC process is discussed in the framework of established and novel alternative mechanisms. The number of vacancies and mainly the symmetry of the ErIII environment play major roles in the deactivation pathways of the UC emission mechanisms. However, the colours obtained by employing bare CeIV or GdIII hosts are preserved in the related monophasic CeIV-rich or GdIII-rich binary hosts. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Fil:Barja, B.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14394235_v18_n10_p1407_Sorbello http://hdl.handle.net/20.500.12110/paper_14394235_v18_n10_p1407_Sorbello
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	energy transfer lanthanides luminescence photochemistry solid-state structures
spellingShingle	energy transfer lanthanides luminescence photochemistry solid-state structures Barja, Beatriz Carmen CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
topic_facet	energy transfer lanthanides luminescence photochemistry solid-state structures
description	A family of ErIII and ErIII–YbIII based nanophosphors, hosted in monophasic oxidic CeIV–GdIII binary solid solutions, was prepared. The samples were formulated with a constant ErIII content as the activator, with the eventual addition of YbIII as a sensitizer. The amorphous Ce0.94−xGdxEr0.06(OH)CO3⋅H2O and Ce0.94−xGdxEr0.05Yb0.01(OH)CO3⋅H2O precursors were prepared by following the urea method to obtain monodispersed spheres of tunable size ranging from 30 to 450 nm. After being decomposed at 1273 K under an atmosphere of air, the precursors of 200 nm in diameter evolved into monophasic polycrystalline particles preserving the parent shape and size. The role of the composition of the binary matrices in the emission properties was evaluated for two different excitation wavelengths (976 nm and 780 nm) based on the upconversion (UC) emission spectra and their dependence on the incident power. The yield of the UC process is discussed in the framework of established and novel alternative mechanisms. The number of vacancies and mainly the symmetry of the ErIII environment play major roles in the deactivation pathways of the UC emission mechanisms. However, the colours obtained by employing bare CeIV or GdIII hosts are preserved in the related monophasic CeIV-rich or GdIII-rich binary hosts. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
author	Barja, Beatriz Carmen
author_facet	Barja, Beatriz Carmen
author_sort	Barja, Beatriz Carmen
title	CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
title_short	CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
title_full	CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
title_fullStr	CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
title_full_unstemmed	CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors
title_sort	ceiv–gdiii mixed oxides as hosts for eriii-based upconversion phosphors
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14394235_v18_n10_p1407_Sorbello http://hdl.handle.net/20.500.12110/paper_14394235_v18_n10_p1407_Sorbello
work_keys_str_mv	AT barjabeatrizcarmen ceivgdiiimixedoxidesashostsforeriiibasedupconversionphosphors
_version_	1768541813716549632

CeIV–GdIII Mixed Oxides as Hosts for ErIII-Based Upconversion Phosphors

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