Eu3+ complex/polymer films for light-emitting diode applications
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.optmat.2019.109323 http://hdl.handle.net/11449/187975 |
Resumo: | Eu3+ complexes exhibit potential to be applied as the red emitter component of white-light-emitting LEDs due to their intense absorption in the near-UV spectral region and intense red-light emission. However, the main problem concerning this application is the poor photostability usually displayed by Eu3+ complexes. To overcome such issue, in this study, transparent films of [C26H56N]+[Eu(dbm)4]- (C26H56N+ is the didodecyldimethylammonium cation and dbm− is 1,3-diphenyl-1,3-propanedione anion) dispersed in poly (methyl methacrylate) (PMMA) were used to coat commercial near-UV emitting LEDs in order to fabricate red-light-emitting LED prototypes. This Eu3+ complex was selected due to its high 5D0 state quantum efficiency (51 %) and absence of water molecules in its structure; the polymer, in its turn, had the purpose to protect the complex from photodegradation. Several PMMA films were produced by the addition of different amounts of complex, i.e., 0.1%, 0.25%, 0.5%, and 1% (w/w). All the films feature the usual Eu3+ emission in the red spectral region and the 5D0 state quantum efficiency enhances as the complex amount increases from 0.1% to 0.5%, while for the 1%, a decrease was observed. Thus, the 0.5% film was adhered with a cyanoacrylate glue on the top of a near-UV LED chip and the prototype exhibited the typical Eu3+ red emission with lower blue contribution coming from the UV LED chip, indicating that UV photons are efficiently converted by the film. Finally, the LED prototype performance was monitored over 26 h, and the emission intensity decreased 35% after 17 h, and from then on, it kept constant. A second LED prototype was manufactured using 5% (w/w) of the complex blended only with the cyanoacrylate glue and it displayed an intensity decrease of 50% after 26 h, confirming the role of PMMA in protecting the Eu3+ complex from photodegradation. |
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Eu3+ complex/polymer films for light-emitting diode applications1,3-diphenylpropane-1,3-dioneLuminescent filmPMMASolid-state lightingEu3+ complexes exhibit potential to be applied as the red emitter component of white-light-emitting LEDs due to their intense absorption in the near-UV spectral region and intense red-light emission. However, the main problem concerning this application is the poor photostability usually displayed by Eu3+ complexes. To overcome such issue, in this study, transparent films of [C26H56N]+[Eu(dbm)4]- (C26H56N+ is the didodecyldimethylammonium cation and dbm− is 1,3-diphenyl-1,3-propanedione anion) dispersed in poly (methyl methacrylate) (PMMA) were used to coat commercial near-UV emitting LEDs in order to fabricate red-light-emitting LED prototypes. This Eu3+ complex was selected due to its high 5D0 state quantum efficiency (51 %) and absence of water molecules in its structure; the polymer, in its turn, had the purpose to protect the complex from photodegradation. Several PMMA films were produced by the addition of different amounts of complex, i.e., 0.1%, 0.25%, 0.5%, and 1% (w/w). All the films feature the usual Eu3+ emission in the red spectral region and the 5D0 state quantum efficiency enhances as the complex amount increases from 0.1% to 0.5%, while for the 1%, a decrease was observed. Thus, the 0.5% film was adhered with a cyanoacrylate glue on the top of a near-UV LED chip and the prototype exhibited the typical Eu3+ red emission with lower blue contribution coming from the UV LED chip, indicating that UV photons are efficiently converted by the film. Finally, the LED prototype performance was monitored over 26 h, and the emission intensity decreased 35% after 17 h, and from then on, it kept constant. A second LED prototype was manufactured using 5% (w/w) of the complex blended only with the cyanoacrylate glue and it displayed an intensity decrease of 50% after 26 h, confirming the role of PMMA in protecting the Eu3+ complex from photodegradation.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)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 SciencesSão Paulo State University (Unesp) School of Technology and SciencesSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact SciencesCAPES: 1531833FAPESP: 2015/10394-1FAPESP: 2016/20421-9CNPq: 304003/2018-2CNPq: 307385/2015-9Universidade Estadual Paulista (Unesp)Leite Silva, C. M.B. [UNESP]Bispo-Jr, A. G. [UNESP]Lima, S. A.M. [UNESP]Pires, A. M. [UNESP]2019-10-06T15:53:06Z2019-10-06T15:53:06Z2019-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.optmat.2019.109323Optical Materials, v. 96.0925-3467http://hdl.handle.net/11449/18797510.1016/j.optmat.2019.1093232-s2.0-85070897075Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengOptical Materialsinfo:eu-repo/semantics/openAccess2021-10-22T19:38:54Zoai:repositorio.unesp.br:11449/187975Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T19:38:54Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Eu3+ complex/polymer films for light-emitting diode applications |
title |
Eu3+ complex/polymer films for light-emitting diode applications |
spellingShingle |
Eu3+ complex/polymer films for light-emitting diode applications Leite Silva, C. M.B. [UNESP] 1,3-diphenylpropane-1,3-dione Luminescent film PMMA Solid-state lighting |
title_short |
Eu3+ complex/polymer films for light-emitting diode applications |
title_full |
Eu3+ complex/polymer films for light-emitting diode applications |
title_fullStr |
Eu3+ complex/polymer films for light-emitting diode applications |
title_full_unstemmed |
Eu3+ complex/polymer films for light-emitting diode applications |
title_sort |
Eu3+ complex/polymer films for light-emitting diode applications |
author |
Leite Silva, C. M.B. [UNESP] |
author_facet |
Leite Silva, C. M.B. [UNESP] Bispo-Jr, A. G. [UNESP] Lima, S. A.M. [UNESP] Pires, A. M. [UNESP] |
author_role |
author |
author2 |
Bispo-Jr, A. G. [UNESP] Lima, S. A.M. [UNESP] Pires, A. M. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Leite Silva, C. M.B. [UNESP] Bispo-Jr, A. G. [UNESP] Lima, S. A.M. [UNESP] Pires, A. M. [UNESP] |
dc.subject.por.fl_str_mv |
1,3-diphenylpropane-1,3-dione Luminescent film PMMA Solid-state lighting |
topic |
1,3-diphenylpropane-1,3-dione Luminescent film PMMA Solid-state lighting |
description |
Eu3+ complexes exhibit potential to be applied as the red emitter component of white-light-emitting LEDs due to their intense absorption in the near-UV spectral region and intense red-light emission. However, the main problem concerning this application is the poor photostability usually displayed by Eu3+ complexes. To overcome such issue, in this study, transparent films of [C26H56N]+[Eu(dbm)4]- (C26H56N+ is the didodecyldimethylammonium cation and dbm− is 1,3-diphenyl-1,3-propanedione anion) dispersed in poly (methyl methacrylate) (PMMA) were used to coat commercial near-UV emitting LEDs in order to fabricate red-light-emitting LED prototypes. This Eu3+ complex was selected due to its high 5D0 state quantum efficiency (51 %) and absence of water molecules in its structure; the polymer, in its turn, had the purpose to protect the complex from photodegradation. Several PMMA films were produced by the addition of different amounts of complex, i.e., 0.1%, 0.25%, 0.5%, and 1% (w/w). All the films feature the usual Eu3+ emission in the red spectral region and the 5D0 state quantum efficiency enhances as the complex amount increases from 0.1% to 0.5%, while for the 1%, a decrease was observed. Thus, the 0.5% film was adhered with a cyanoacrylate glue on the top of a near-UV LED chip and the prototype exhibited the typical Eu3+ red emission with lower blue contribution coming from the UV LED chip, indicating that UV photons are efficiently converted by the film. Finally, the LED prototype performance was monitored over 26 h, and the emission intensity decreased 35% after 17 h, and from then on, it kept constant. A second LED prototype was manufactured using 5% (w/w) of the complex blended only with the cyanoacrylate glue and it displayed an intensity decrease of 50% after 26 h, confirming the role of PMMA in protecting the Eu3+ complex from photodegradation. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:53:06Z 2019-10-06T15:53:06Z 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.optmat.2019.109323 Optical Materials, v. 96. 0925-3467 http://hdl.handle.net/11449/187975 10.1016/j.optmat.2019.109323 2-s2.0-85070897075 |
url |
http://dx.doi.org/10.1016/j.optmat.2019.109323 http://hdl.handle.net/11449/187975 |
identifier_str_mv |
Optical Materials, v. 96. 0925-3467 10.1016/j.optmat.2019.109323 2-s2.0-85070897075 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Optical 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 |
|
_version_ |
1799965111400529920 |