Syntheses and characterization of Schiff base ligands and their Ir(III) complexes as coating for phosphor-converted LEDs

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dc.contributor.authorCanisares, Felipe S.M. [UNESP]
dc.contributor.authorBispo-Jr, Airton G. [UNESP]
dc.contributor.authorPires, Ana M. [UNESP]
dc.contributor.authorLima, Sergio A.M. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-12T01:32:38Z
dc.date.available2020-12-12T01:32:38Z
dc.date.issued2020-10-01
dc.description.abstractIr(III) complexes find several applications in light conversion molecular devices (LCMD) such as in solid-state lighting (SSL). Although, a couple of blue or green-emitting Ir(III) complexes are found so far, there is a lack of near-UV-to-red downshifting converter Ir(III) complexes to be used as coatings of near-UV-excited white-light-emitting diodes (WLEDs). Thus, in this study, we introduce the syntheses of two ligands named as 2-(((3-methyl-1-phenyl-1H-pyrazol-5-yl)imino)methyl)phenol (BS1) and 5-(diethylamino)-2-(((3-methyl-1-phenyl-1H-pyrazol-5-yl)imino)methyl)phenol (BS2) and their use to synthesize two new red-emitting iridium complexes, Ag[Ir(ppz)2(BS1)] and Ag[Ir(ppz)2(BS2)]. BS1 and BS2 structures were deeply investigated theoretically and experimentally, and they display emission in the yellow and green spectral region under UV excitation, respectively. Ag[Ir(ppz)2(BS1)] and Ag[Ir(ppz)2(BS2)] features emission characterized by a broadband centered with color coordinates of (0.659;0.337) and (0.612;0.380), respectively, both in the red spectral region, with 100 % of color purity. To demonstrate their application in SSL, BS1 and Ag[Ir(ppz)2(BS1)] were used to coat commercial near-UV-emitting LEDs (395 nm). The radiant stability of the prototypes overseen for 24 h attests that the emission intensity of the Ag[Ir(ppz)2(BS1)]-LED prototype decreases only 10 %, confirming that the complex matches with the desired photostability and qualifying this complex to be used as coatings of near-UV excited white-light-emitting diodes.en
dc.description.affiliationSão Paulo State University (Unesp) School of Technology and Sciences
dc.description.affiliationSão Paulo State University (Unesp) Institute of Chemistry
dc.description.affiliationSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, São José Do Rio Preto
dc.description.affiliationUnespSão Paulo State University (Unesp) School of Technology and Sciences
dc.description.affiliationUnespSão Paulo State University (Unesp) Institute of Chemistry
dc.description.affiliationUnespSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, São José Do Rio Preto
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2012/13876-9
dc.description.sponsorshipIdFAPESP: 2015/03400-5
dc.description.sponsorshipIdFAPESP: 2015/10394-1
dc.description.sponsorshipIdFAPESP: 2016/20421-9
dc.description.sponsorshipIdCAPES: 88887.341772/2019-00
dc.identifierhttp://dx.doi.org/10.1016/j.ijleo.2020.164995
dc.identifier.citationOptik, v. 219.
dc.identifier.doi10.1016/j.ijleo.2020.164995
dc.identifier.issn0030-4026
dc.identifier.scopus2-s2.0-85088646184
dc.identifier.urihttp://hdl.handle.net/11449/199169
dc.language.isoeng
dc.relation.ispartofOptik
dc.sourceScopus
dc.subjectDownshifting converter
dc.subjectIridium(III)
dc.subjectLight conversion molecular devices (LCMD)
dc.subjectPhotoluminescence
dc.subjectRed emitter
dc.subjectSolid-state lighting (SSL)
dc.subjectUV-LED
dc.subjectWLEDs
dc.titleSyntheses and characterization of Schiff base ligands and their Ir(III) complexes as coating for phosphor-converted LEDsen
dc.typeArtigo

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