Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jlumin.2019.116604 http://hdl.handle.net/11449/187840 |
Resumo: | Herein, we introduce an adapted sol-gel synthesis of blue-green-emitting phosphors based on Ba2SiO4:Tb3+, which were obtained in a quite-soft calcination condition (1100 °C/2 h) as a monophasic crystalline phase, space group Pmcn (62), characterized by high-agglomerated particles. The optical band gap value decreases as the amount of Tb3+ increases, from 5.65 eV (undoped) to 4.40 eV (5 %-doped). All doped samples are excited by UV radiation (250 nm), emitting in the blue and green spectral region as a result of the Tb3+ transitions arising from the 5D3 and 5D4 excited levels, respectively. Yet, the overall emitted color of the phosphor is tuned by the Tb3+ concentration since the increase of the activator amount dislocates the emission color from blue toward green due to a dipole-dipole energy transfer between two close Tb3+ ions. The emission quantum efficiency of the 5D4 state is a function of the emission intensity and it enhances up to the 4 %-doped sample. A new approach to calculate the 5D3 state quantum efficiency of Tb3+ is also proposed and these values decrease from 95.3% to 42.4% as the doping amount enhances from 0.1 up to 5%. Thus, both the green-blue color tunability and the high quantum efficiency qualify this material for future photonic applications. |
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Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel methodBa2SiO4Energy transferLuminescenceSilicateSol-gelTerbiumHerein, we introduce an adapted sol-gel synthesis of blue-green-emitting phosphors based on Ba2SiO4:Tb3+, which were obtained in a quite-soft calcination condition (1100 °C/2 h) as a monophasic crystalline phase, space group Pmcn (62), characterized by high-agglomerated particles. The optical band gap value decreases as the amount of Tb3+ increases, from 5.65 eV (undoped) to 4.40 eV (5 %-doped). All doped samples are excited by UV radiation (250 nm), emitting in the blue and green spectral region as a result of the Tb3+ transitions arising from the 5D3 and 5D4 excited levels, respectively. Yet, the overall emitted color of the phosphor is tuned by the Tb3+ concentration since the increase of the activator amount dislocates the emission color from blue toward green due to a dipole-dipole energy transfer between two close Tb3+ ions. The emission quantum efficiency of the 5D4 state is a function of the emission intensity and it enhances up to the 4 %-doped sample. A new approach to calculate the 5D3 state quantum efficiency of Tb3+ is also proposed and these values decrease from 95.3% to 42.4% as the doping amount enhances from 0.1 up to 5%. Thus, both the green-blue color tunability and the high quantum efficiency qualify this material for future photonic applications.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)São Paulo State University (Unesp) School of Technology and SciencesSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, São José do Rio PretoSão Paulo State University (Unesp) School of Technology and SciencesSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, São José do Rio PretoFAPESP: 2012/13876-9FAPESP: 2015/10394-1FAPESP: 2016/20421-9CNPq: 307385/2015Universidade Estadual Paulista (Unesp)Bispo-Jr, A. G. [UNESP]Lima, S. A.M. [UNESP]Lanfredi, S. [UNESP]Praxedes, F. R. [UNESP]Pires, A. M. [UNESP]2019-10-06T15:48:51Z2019-10-06T15:48:51Z2019-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jlumin.2019.116604Journal of Luminescence, v. 214.0022-2313http://hdl.handle.net/11449/18784010.1016/j.jlumin.2019.1166042-s2.0-85068528472Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Luminescenceinfo:eu-repo/semantics/openAccess2021-10-23T10:11:14Zoai:repositorio.unesp.br:11449/187840Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:39:33.920167Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
title |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
spellingShingle |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method Bispo-Jr, A. G. [UNESP] Ba2SiO4 Energy transfer Luminescence Silicate Sol-gel Terbium |
title_short |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
title_full |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
title_fullStr |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
title_full_unstemmed |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
title_sort |
Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method |
author |
Bispo-Jr, A. G. [UNESP] |
author_facet |
Bispo-Jr, A. G. [UNESP] Lima, S. A.M. [UNESP] Lanfredi, S. [UNESP] Praxedes, F. R. [UNESP] Pires, A. M. [UNESP] |
author_role |
author |
author2 |
Lima, S. A.M. [UNESP] Lanfredi, S. [UNESP] Praxedes, F. R. [UNESP] Pires, A. M. [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Bispo-Jr, A. G. [UNESP] Lima, S. A.M. [UNESP] Lanfredi, S. [UNESP] Praxedes, F. R. [UNESP] Pires, A. M. [UNESP] |
dc.subject.por.fl_str_mv |
Ba2SiO4 Energy transfer Luminescence Silicate Sol-gel Terbium |
topic |
Ba2SiO4 Energy transfer Luminescence Silicate Sol-gel Terbium |
description |
Herein, we introduce an adapted sol-gel synthesis of blue-green-emitting phosphors based on Ba2SiO4:Tb3+, which were obtained in a quite-soft calcination condition (1100 °C/2 h) as a monophasic crystalline phase, space group Pmcn (62), characterized by high-agglomerated particles. The optical band gap value decreases as the amount of Tb3+ increases, from 5.65 eV (undoped) to 4.40 eV (5 %-doped). All doped samples are excited by UV radiation (250 nm), emitting in the blue and green spectral region as a result of the Tb3+ transitions arising from the 5D3 and 5D4 excited levels, respectively. Yet, the overall emitted color of the phosphor is tuned by the Tb3+ concentration since the increase of the activator amount dislocates the emission color from blue toward green due to a dipole-dipole energy transfer between two close Tb3+ ions. The emission quantum efficiency of the 5D4 state is a function of the emission intensity and it enhances up to the 4 %-doped sample. A new approach to calculate the 5D3 state quantum efficiency of Tb3+ is also proposed and these values decrease from 95.3% to 42.4% as the doping amount enhances from 0.1 up to 5%. Thus, both the green-blue color tunability and the high quantum efficiency qualify this material for future photonic applications. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:48:51Z 2019-10-06T15:48:51Z 2019-10-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jlumin.2019.116604 Journal of Luminescence, v. 214. 0022-2313 http://hdl.handle.net/11449/187840 10.1016/j.jlumin.2019.116604 2-s2.0-85068528472 |
url |
http://dx.doi.org/10.1016/j.jlumin.2019.116604 http://hdl.handle.net/11449/187840 |
identifier_str_mv |
Journal of Luminescence, v. 214. 0022-2313 10.1016/j.jlumin.2019.116604 2-s2.0-85068528472 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Luminescence |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129102141456384 |