Efficient green-emitting Tb3+-doped di-ureasil coating phosphors for near-UV excited light-emitting diodes

Detalhes bibliográficos
Autor(a) principal: Fang, Ming
Data de Publicação: 2020
Outros Autores: Bispo-Jr, Airton G. [UNESP], Fu, Lianshe, Ferreira, Rute A.S., Carlos, Luís D.
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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spelling 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
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