Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres

Detalhes bibliográficos
Autor(a) principal: Ansari,Anees Ahmad
Data de Publicação: 2018
Outros Autores: Manthrammel,Mohamed Aslam
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300020
Resumo: The polyol-based co-precipitation process was employed for synthesis of GdF3:Pr (core) and GdF3:Pr@LaF3 (core-shell) microspheres (MSs). Subsequently, an amorphous silica layer was deposited surrounding the core-shell MSs, which was verified from high-resolution transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and FTIR results. The absorption spectral results revealed the high solubility with good colloidal stability in aqueous solvents. The detailed structural and morphological analysis, as well as crystallinity of the samples, was investigated through X-ray diffraction, TEM and band gap energy results. The experimentally calculated band gap energy was found to decrease after gradually coating insulating layers of LaF3 and amorphous silica over the surface, because of an effective increase in particle size. The Pr3+-doped GdF3 shows sharp 4f15d1→4f2 emission bands (260-480 nm) as well as typical 4f2→ 4f2 emission lines (460-800 nm) of Pr3+ under 4f2 →4f15d1 excitation. After surface coating, comparative photoluminescence properties of the MSs were investigated by excitation and emission spectra. The origin of the different types of emission transitions were analyzed in details.
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spelling Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 MicrospheresPraseodymiumGadolinium fluorideCore-shellSilicaBand gap energyPhotoluminescenceThe polyol-based co-precipitation process was employed for synthesis of GdF3:Pr (core) and GdF3:Pr@LaF3 (core-shell) microspheres (MSs). Subsequently, an amorphous silica layer was deposited surrounding the core-shell MSs, which was verified from high-resolution transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and FTIR results. The absorption spectral results revealed the high solubility with good colloidal stability in aqueous solvents. The detailed structural and morphological analysis, as well as crystallinity of the samples, was investigated through X-ray diffraction, TEM and band gap energy results. The experimentally calculated band gap energy was found to decrease after gradually coating insulating layers of LaF3 and amorphous silica over the surface, because of an effective increase in particle size. The Pr3+-doped GdF3 shows sharp 4f15d1→4f2 emission bands (260-480 nm) as well as typical 4f2→ 4f2 emission lines (460-800 nm) of Pr3+ under 4f2 →4f15d1 excitation. After surface coating, comparative photoluminescence properties of the MSs were investigated by excitation and emission spectra. The origin of the different types of emission transitions were analyzed in details.ABM, ABC, ABPol2018-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300020Materials Research v.21 n.3 2018reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2017-1015info:eu-repo/semantics/openAccessAnsari,Anees AhmadManthrammel,Mohamed Aslameng2018-05-10T00:00:00Zoai:scielo:S1516-14392018000300020Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2018-05-10T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
title Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
spellingShingle Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
Ansari,Anees Ahmad
Praseodymium
Gadolinium fluoride
Core-shell
Silica
Band gap energy
Photoluminescence
title_short Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
title_full Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
title_fullStr Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
title_full_unstemmed Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
title_sort Physiochemical and Optical Properties of GdF3:Pr@LaF3@SiO2 Microspheres
author Ansari,Anees Ahmad
author_facet Ansari,Anees Ahmad
Manthrammel,Mohamed Aslam
author_role author
author2 Manthrammel,Mohamed Aslam
author2_role author
dc.contributor.author.fl_str_mv Ansari,Anees Ahmad
Manthrammel,Mohamed Aslam
dc.subject.por.fl_str_mv Praseodymium
Gadolinium fluoride
Core-shell
Silica
Band gap energy
Photoluminescence
topic Praseodymium
Gadolinium fluoride
Core-shell
Silica
Band gap energy
Photoluminescence
description The polyol-based co-precipitation process was employed for synthesis of GdF3:Pr (core) and GdF3:Pr@LaF3 (core-shell) microspheres (MSs). Subsequently, an amorphous silica layer was deposited surrounding the core-shell MSs, which was verified from high-resolution transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and FTIR results. The absorption spectral results revealed the high solubility with good colloidal stability in aqueous solvents. The detailed structural and morphological analysis, as well as crystallinity of the samples, was investigated through X-ray diffraction, TEM and band gap energy results. The experimentally calculated band gap energy was found to decrease after gradually coating insulating layers of LaF3 and amorphous silica over the surface, because of an effective increase in particle size. The Pr3+-doped GdF3 shows sharp 4f15d1→4f2 emission bands (260-480 nm) as well as typical 4f2→ 4f2 emission lines (460-800 nm) of Pr3+ under 4f2 →4f15d1 excitation. After surface coating, comparative photoluminescence properties of the MSs were investigated by excitation and emission spectra. The origin of the different types of emission transitions were analyzed in details.
publishDate 2018
dc.date.none.fl_str_mv 2018-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300020
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300020
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1980-5373-mr-2017-1015
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.21 n.3 2018
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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