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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.)

Eu3+-tetrakis beta-diketonate complexes for solid-state lighting application

Full text
Author(s):
Leite Silva, Camila M. B. [1, 2] ; Bispo-Jr, Airton G. ; Canisares, Felipe S. M. [3, 4] ; Castilho, Shirley A. [3] ; Lima, Sergio A. M. [3, 4] ; Pires, Ana M. [3, 4]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ Unesp, Sch Technol & Sci, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[2] Sao Paulo State Univ UNESP, Inst Biosci Humanities & Exact Sci, Sao Jose Do Rio Preto, SP - Brazil
[3] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Sch Technol & Sci, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[4] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: LUMINESCENCE; v. 34, n. 8 JULY 2019.
Web of Science Citations: 1
Abstract

Eu3+-beta-diketonate complexes are used, for example, in solid-state lighting (SSL) or light-converting molecular devices. However, their low emission quantum efficiency due to water molecules coordinated to Eu3+ and low photostability are still problems to be addressed. To overcome such challenges, we synthesized Eu3+ tetrakis complexes based on {[}Q]{[}Eu(tfaa)(4)] and {[}Q]{[}Eu(dbm)(4)] (Q1 = C26H56N+, Q2 = C19H42N+, and Q3 = C17H38N+), replacing the water molecules in the tris stoichiometry. The tetrakis beta-diketonates showed desirable thermal stability for SSL and, under excitation at 390 nm, they displayed the characteristic Eu3+ emission in the red spectral region. The quantum efficiencies of the dbm complexes achieved values as high as 51%, while the tfaa complexes exhibited lower quantum efficiencies (28-33%), but which were superior to those reported for the tris complexes. The structures were evaluated using the Sparkle/PM7 model and comparing the theoretical and the experimental Judd-Ofelt parameters. {[}Q1]{[}Eu(dbm)(4)] was used to coat a near-UV light-emitting diode (LED), producing a red-emitting LED prototype that featured the characteristic emission spectrum of {[}Q1]{[}Eu(dbm)(4)]. The emission intensity of this prototype decreased only 7% after 30 h, confirming its high photostability, which is a notable result considering Eu3+ complexes, making it a potential candidate for SSL. (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: 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