| 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 |