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

Autor(es)

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]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: LUMINESCENCE; v. 34, n. 8 JULY 2019.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 12/13876-9 - Efeitos ópticos e estruturais da variação da concentração do íon dopante Eu(III) na matriz Ba2SiO4 sintetizada via sol-gel
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 16/20421-9 - Dispositivos tricromáticos a base de Ba2SiO4:Eu3+ e/ou Tb3+: síntese sol-gel e deposição eletroforética visando aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 15/10394-1 - Filmes LBL luminescentes de Ba2SiO4 dopado com terras raras obtido via sol-gel para aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Modalidade de apoio: Bolsas no Brasil - Mestrado