Abstract
Two europium(III) complexes of Tfl-PIPEu(TTA)3 and PIPEu(TTA)3 (Tfl=alkyltrifluorene, PIP=phenyl-1H-imidazo[4,5-f] [1,10]phenanthroline, TTA=2-thenoyltrifluoroacetone) were synthesized, which contain an alkyltrifluorene unit or octyl unit, respectively. Their thermal, optophysical, electrochemical properties and dispersibility were investigated. The electroluminescence (EL) properties of Tfl-PIPEu(TTA)3 and PIPEu(TTA)3 were also examined. It was found that the Tfl-PIPEu(TTA)3-based devices have a better EL performance compared to PIPEu(TTA)3-based devices because Tfl-PIPEu(TTA)3 exhibits a more matched energy levels with the polyvinylcarbazole:2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PVK-PBD) and better dispersibility in the PVK-PBD blend. The Tfl-PIPEu(TTA)3-based devices show a sharp red emission at 616nm with a full width at half-maximum of 10nm at the dopant concentrations from 1.0 to 8.0wt% and a maximum brightness of 229cdm−2 is obtained at 4.0wt% doped concentration. The maximum brightness is 2.52 times higher than that of the PIPEu(TTA)3-based devices. Our work indicates that the introduction of an alkyltrifluorene unit can improve the device performance for its resulting europium(III) complexes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
