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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Canisares, Felipe S. M. [1, 2, 3] ; Bispo-Jr, Airton G. ; Pires, Ana M. [2, 3, 4] ; Lima, Sergio A. M. [2, 3]
Total Authors: 4
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, Araraquara, SP - Brazil
[2] Sao Paulo State Univ Unesp, Sch Technol & Sci, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[3] Sao Paulo State Univ UNESP, Inst Biosci Humanities & Exact Sci, Sao Jose Do Rio Preto, SP - Brazil
[4] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Inst Chem, Araraquara, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: OPTIK; v. 219, OCT 2020.
Web of Science Citations: 1
Abstract

Ir(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)phe nol (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. (AU)

FAPESP's process: 12/13876-9 - Optical and Structural effects of Eu(III) doping ion concentration in the Ba2SiO4 host lattice synthesized via sol-gel method
Grantee:Airton Germano Bispo Júnior
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 15/03400-5 - Synthesis and characterization of lanthanide complexes with carboxylic acid ligands
Grantee:Felipe da Silva Manrique Canisares
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/20421-9 - Tricolor devices based on Ba2SiO4:Eu3+ e/ou Tb3+: sol-gel synthesis and eletrophoretic deposition for W-LEDs application
Grantee:Airton Germano Bispo Júnior
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 15/10394-1 - LBL luminescent thin films of rare earth doped Ba2SiO4 obtained via sol-gel for white LED application
Grantee:Airton Germano Bispo Júnior
Support Opportunities: Scholarships in Brazil - Master