Eu(II)-Activated Silicates for UV Light-Emitting Diodes Tuning into Warm White Light
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
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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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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1808128763062386688 |