Red light emitting nano-PVP fibers that hybrid with Ag@SiO2@Eu(tta)3phen-NPs by electrostatic spinning method

This work demonstrated red light emitting nano-PVP fibers that incorporated with novel three-layer nanostructure of Ag@SiO 2 @Eu(tta) 3 phen nanoparticles (Ag@SiO 2 @Eu(tta) 3 phen-NPs), and the hybrid nano-PVP fibers were fabricated via a remarkably simple electrostatic spinning method. For Ag@SiO 2 @Eu(tta) 3 phen-NPs, the thickness of SiO 2 is optimized to obtain the maximum luminescent intensity , as results, the optimized thickness of SiO 2 is 20 nm. And the corresponding luminescent intensity (612 nm) of the Ag@SiO 2 @Eu(tta) 3 phen-NPs is enhanced up to 10 times compared with the pure Eu(tta) 3 phen complex, which indicates that with 20 nm SiO 2 thickness, the localized surface plasmon resonance (LSPR) effect of Ag@SiO 2 exhibits highest performance for enhancing luminescence. Moreover, the luminescent PVP fibers emit bright red light under the fluorescence microscope, which definitely confirms that the microenvironment provided by PVP polymer is absolutely suitable for the fluorescent composites.