Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes
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/10.1016/j.jlumin.2019.116910 http://hdl.handle.net/11449/198324 |
Resumo: | Light-emitting diodes (LEDs) are replacing conventional lighting sources, like incandescent and fluorescent lamps, due to their higher efficiency, lower energy consumption and environmental friendliness characteristics. Additional applications envisaging “engineered light” able to control the human circadian rhythm are now in place with emphases on green-emitting LEDs. In this work, transparent and flexible coatings based on organic–inorganic di-ureasil hybrids doped in-situ with a terbium (Tb3+) complex involving salicylic acid as ligands were synthesized. The materials are transparent, essentially amorphous and thermal stable up to 180 °C. Under near-UV excitation, bright green emission with high quantum yield (0.565 ± 0.057) and enhanced photostability are observed. Green-emitting prototypes were fabricated using a commercial near-UV-emitting LED (NUV-LED) combined with the Tb3+-doped di-ureasil coating showing narrow-band green emission with yellowish-green color coordinates (Commission Internationale de l'Éclairage, CIE 1931) of (0.329, 0.606) and high luminous efficacy (21.5 lm/W). This efficacy is the largest one reported for analogous prototypes formed by an NUV-LED coated with a green-emitting phosphor prepared under mild synthetic conditions (<100 °C), demonstrating that in-situ formation of carboxylate lanthanide-based complexes is an energy saving process with potential for solid-state lighting and backlight for flexible displays. |
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Repositório Institucional da UNESP |
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Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodesDi-ureasilGreen colorLight-emitting diodePhotoluminescenceSolid-state lightingTerbiumLight-emitting diodes (LEDs) are replacing conventional lighting sources, like incandescent and fluorescent lamps, due to their higher efficiency, lower energy consumption and environmental friendliness characteristics. Additional applications envisaging “engineered light” able to control the human circadian rhythm are now in place with emphases on green-emitting LEDs. In this work, transparent and flexible coatings based on organic–inorganic di-ureasil hybrids doped in-situ with a terbium (Tb3+) complex involving salicylic acid as ligands were synthesized. The materials are transparent, essentially amorphous and thermal stable up to 180 °C. Under near-UV excitation, bright green emission with high quantum yield (0.565 ± 0.057) and enhanced photostability are observed. Green-emitting prototypes were fabricated using a commercial near-UV-emitting LED (NUV-LED) combined with the Tb3+-doped di-ureasil coating showing narrow-band green emission with yellowish-green color coordinates (Commission Internationale de l'Éclairage, CIE 1931) of (0.329, 0.606) and high luminous efficacy (21.5 lm/W). This efficacy is the largest one reported for analogous prototypes formed by an NUV-LED coated with a green-emitting phosphor prepared under mild synthetic conditions (<100 °C), demonstrating that in-situ formation of carboxylate lanthanide-based complexes is an energy saving process with potential for solid-state lighting and backlight for flexible displays.Ministério da Ciência, Tecnologia e Ensino SuperiorFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)China Scholarship CouncilFundação para a Ciência e a TecnologiaDepartment of Physics CICECO–Aveiro Institute of Materials University of AveiroSão Paulo State University (UNESP) School of Technology and SciencesUNESP-Institute of Biosciences Humanities and Exact SciencesSão Paulo State University (UNESP) School of Technology and SciencesUNESP-Institute of Biosciences Humanities and Exact SciencesFAPESP: 2015/10394-1FAPESP: 2016/20421-9FAPESP: 2017/21995-1China Scholarship Council: 201707920002Fundação para a Ciência e a Tecnologia: UID/CTM/50011/2019University of AveiroUniversidade Estadual Paulista (Unesp)Fang, MingBispo-Jr, Airton G. [UNESP]Fu, LiansheFerreira, Rute A.S.Carlos, Luís D.2020-12-12T01:09:44Z2020-12-12T01:09:44Z2020-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jlumin.2019.116910Journal of Luminescence, v. 219.0022-2313http://hdl.handle.net/11449/19832410.1016/j.jlumin.2019.1169102-s2.0-85077112222Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Luminescenceinfo:eu-repo/semantics/openAccess2021-10-23T09:55:12Zoai:repositorio.unesp.br:11449/198324Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:00:22.656807Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
title |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
spellingShingle |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes Fang, Ming Di-ureasil Green color Light-emitting diode Photoluminescence Solid-state lighting Terbium |
title_short |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
title_full |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
title_fullStr |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
title_full_unstemmed |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
title_sort |
Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes |
author |
Fang, Ming |
author_facet |
Fang, Ming Bispo-Jr, Airton G. [UNESP] Fu, Lianshe Ferreira, Rute A.S. Carlos, Luís D. |
author_role |
author |
author2 |
Bispo-Jr, Airton G. [UNESP] Fu, Lianshe Ferreira, Rute A.S. Carlos, Luís D. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
University of Aveiro Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Fang, Ming Bispo-Jr, Airton G. [UNESP] Fu, Lianshe Ferreira, Rute A.S. Carlos, Luís D. |
dc.subject.por.fl_str_mv |
Di-ureasil Green color Light-emitting diode Photoluminescence Solid-state lighting Terbium |
topic |
Di-ureasil Green color Light-emitting diode Photoluminescence Solid-state lighting Terbium |
description |
Light-emitting diodes (LEDs) are replacing conventional lighting sources, like incandescent and fluorescent lamps, due to their higher efficiency, lower energy consumption and environmental friendliness characteristics. Additional applications envisaging “engineered light” able to control the human circadian rhythm are now in place with emphases on green-emitting LEDs. In this work, transparent and flexible coatings based on organic–inorganic di-ureasil hybrids doped in-situ with a terbium (Tb3+) complex involving salicylic acid as ligands were synthesized. The materials are transparent, essentially amorphous and thermal stable up to 180 °C. Under near-UV excitation, bright green emission with high quantum yield (0.565 ± 0.057) and enhanced photostability are observed. Green-emitting prototypes were fabricated using a commercial near-UV-emitting LED (NUV-LED) combined with the Tb3+-doped di-ureasil coating showing narrow-band green emission with yellowish-green color coordinates (Commission Internationale de l'Éclairage, CIE 1931) of (0.329, 0.606) and high luminous efficacy (21.5 lm/W). This efficacy is the largest one reported for analogous prototypes formed by an NUV-LED coated with a green-emitting phosphor prepared under mild synthetic conditions (<100 °C), demonstrating that in-situ formation of carboxylate lanthanide-based complexes is an energy saving process with potential for solid-state lighting and backlight for flexible displays. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:09:44Z 2020-12-12T01:09:44Z 2020-03-01 |
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.2019.116910 Journal of Luminescence, v. 219. 0022-2313 http://hdl.handle.net/11449/198324 10.1016/j.jlumin.2019.116910 2-s2.0-85077112222 |
url |
http://dx.doi.org/10.1016/j.jlumin.2019.116910 http://hdl.handle.net/11449/198324 |
identifier_str_mv |
Journal of Luminescence, v. 219. 0022-2313 10.1016/j.jlumin.2019.116910 2-s2.0-85077112222 |
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_ |
1808128592486334464 |