Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light

Detalhes bibliográficos
Autor(a) principal: Bispo-Jr, Airton G. [UNESP]
Data de Publicação: 2020
Outros Autores: Lima, Sergio A. M. [UNESP], Carlos, Luís D., Pires, Ana M. [UNESP], Ferreira, Rute A. S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1002/adem.202000422
http://hdl.handle.net/11449/198892
Resumo: White-light-emitting diodes (WLEDs) are the main white light source for general lighting due to high-luminous efficacy (>150 lm W−1), long lifespan (5 × 104 h), and environmentally friendly properties. Despite the current maturity and reliability of the solid state-lighting field, the control of the correlated color temperature (CCT) tuning is still a challenge, arising from the lack of red emission color in the current design of commercial WLEDs. Moreover, as this aspect is often associated with dysregulations of the human circadian rhythm, the need for novel WLEDs is of enlarged societal relevance. In this scope, herein, warm WLED prototypes are fabricated by coating near-UV-emitting LEDs with a mixture of the yellow-emitting polyphasic Sr2SiO4:Eu(II) (S2S) and the blue-emitting BaMgAl10O17:Eu(II) (BAM) phosphors dispersed in poly(methyl methacrylate). As the amount of S2S increases in the phosphor mixture, the CCT values of the WLEDs decrease from 6500 K (ideal for daylight application) to 4000 K (ideal for night light application), with a luminous efficacy of radiation of 404 lm W−1, among the best figures of merit for WLEDs. Furthermore, all the WLED devices also display a desirable color rendering index (CRI > 75), comparable with the commercial WLED, independent on the operating voltage.
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spelling Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Lightnew-UV LEDsphosphorssolid-state lightingwarm white lightWhite-light-emitting diodes (WLEDs) are the main white light source for general lighting due to high-luminous efficacy (>150 lm W−1), long lifespan (5 × 104 h), and environmentally friendly properties. Despite the current maturity and reliability of the solid state-lighting field, the control of the correlated color temperature (CCT) tuning is still a challenge, arising from the lack of red emission color in the current design of commercial WLEDs. Moreover, as this aspect is often associated with dysregulations of the human circadian rhythm, the need for novel WLEDs is of enlarged societal relevance. In this scope, herein, warm WLED prototypes are fabricated by coating near-UV-emitting LEDs with a mixture of the yellow-emitting polyphasic Sr2SiO4:Eu(II) (S2S) and the blue-emitting BaMgAl10O17:Eu(II) (BAM) phosphors dispersed in poly(methyl methacrylate). As the amount of S2S increases in the phosphor mixture, the CCT values of the WLEDs decrease from 6500 K (ideal for daylight application) to 4000 K (ideal for night light application), with a luminous efficacy of radiation of 404 lm W−1, among the best figures of merit for WLEDs. Furthermore, all the WLED devices also display a desirable color rendering index (CRI > 75), comparable with the commercial WLED, independent on the operating voltage.Fundação para a Ciência e a TecnologiaSchool of Technology and Sciences São Paulo State University (Unesp)Institute of Biosciences Humanities and Exact Sciences São Paulo State University (Unesp)Institute of Chemistry São Paulo State University (Unesp)Phantom-g CICECO-Aveiro Institute of Materials and Physics Department University of AveiroSchool of Technology and Sciences São Paulo State University (Unesp)Institute of Biosciences Humanities and Exact Sciences São Paulo State University (Unesp)Institute of Chemistry São Paulo State University (Unesp)Fundação para a Ciência e a Tecnologia: UIDB/50011/2020Fundação para a Ciência e a Tecnologia: UIDP/50011/2020Universidade Estadual Paulista (Unesp)University of AveiroBispo-Jr, Airton G. [UNESP]Lima, Sergio A. M. [UNESP]Carlos, Luís D.Pires, Ana M. [UNESP]Ferreira, Rute A. S.2020-12-12T01:24:45Z2020-12-12T01:24:45Z2020-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1002/adem.202000422Advanced Engineering Materials, v. 22, n. 8, 2020.1527-26481438-1656http://hdl.handle.net/11449/19889210.1002/adem.2020004222-s2.0-85085515960Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAdvanced Engineering Materialsinfo:eu-repo/semantics/openAccess2021-10-22T20:49:15Zoai:repositorio.unesp.br:11449/198892Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:09:37.383418Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
title Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
spellingShingle Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
Bispo-Jr, Airton G. [UNESP]
new-UV LEDs
phosphors
solid-state lighting
warm white light
title_short Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
title_full Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
title_fullStr Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
title_full_unstemmed Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
title_sort Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
author Bispo-Jr, Airton G. [UNESP]
author_facet Bispo-Jr, Airton G. [UNESP]
Lima, Sergio A. M. [UNESP]
Carlos, Luís D.
Pires, Ana M. [UNESP]
Ferreira, Rute A. S.
author_role author
author2 Lima, Sergio A. M. [UNESP]
Carlos, Luís D.
Pires, Ana M. [UNESP]
Ferreira, Rute A. S.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
University of Aveiro
dc.contributor.author.fl_str_mv Bispo-Jr, Airton G. [UNESP]
Lima, Sergio A. M. [UNESP]
Carlos, Luís D.
Pires, Ana M. [UNESP]
Ferreira, Rute A. S.
dc.subject.por.fl_str_mv new-UV LEDs
phosphors
solid-state lighting
warm white light
topic new-UV LEDs
phosphors
solid-state lighting
warm white light
description White-light-emitting diodes (WLEDs) are the main white light source for general lighting due to high-luminous efficacy (>150 lm W−1), long lifespan (5 × 104 h), and environmentally friendly properties. Despite the current maturity and reliability of the solid state-lighting field, the control of the correlated color temperature (CCT) tuning is still a challenge, arising from the lack of red emission color in the current design of commercial WLEDs. Moreover, as this aspect is often associated with dysregulations of the human circadian rhythm, the need for novel WLEDs is of enlarged societal relevance. In this scope, herein, warm WLED prototypes are fabricated by coating near-UV-emitting LEDs with a mixture of the yellow-emitting polyphasic Sr2SiO4:Eu(II) (S2S) and the blue-emitting BaMgAl10O17:Eu(II) (BAM) phosphors dispersed in poly(methyl methacrylate). As the amount of S2S increases in the phosphor mixture, the CCT values of the WLEDs decrease from 6500 K (ideal for daylight application) to 4000 K (ideal for night light application), with a luminous efficacy of radiation of 404 lm W−1, among the best figures of merit for WLEDs. Furthermore, all the WLED devices also display a desirable color rendering index (CRI > 75), comparable with the commercial WLED, independent on the operating voltage.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T01:24:45Z
2020-12-12T01:24:45Z
2020-08-01
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/10.1002/adem.202000422
Advanced Engineering Materials, v. 22, n. 8, 2020.
1527-2648
1438-1656
http://hdl.handle.net/11449/198892
10.1002/adem.202000422
2-s2.0-85085515960
url http://dx.doi.org/10.1002/adem.202000422
http://hdl.handle.net/11449/198892
identifier_str_mv Advanced Engineering Materials, v. 22, n. 8, 2020.
1527-2648
1438-1656
10.1002/adem.202000422
2-s2.0-85085515960
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Advanced Engineering Materials
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
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