期刊
LUMINESCENCE
卷 34, 期 8, 页码 877-886出版社
WILEY
DOI: 10.1002/bio.3686
关键词
dbm; energy transfer; light-emitting diodes; Sparkle; PM7 model; tfaa
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [307385/2015-9]
- Sao Paulo Research Foundation (FAPESP) [2016/20421-9, 2015/10394-1, 2012/13876-9]
- CAPES
- CNPq
- FAPESP
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.
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