Plasmon-Controlled Selective Emission Enhancement of Eu3+ with (Au Core)@(Y(V,P)O4:Eu) Nanostructures

Plasmonic nanostructures have a capability to controlthe photoluminescence(PL) emission properties of optical species and thus can dramaticallyenhance the performances of diverse optical systems and devices. Lanthanideions typically exhibit multiple PL emission lines. Systematic studieson the plasmon-enabled selective enhancement for the different emissionlines of lanthanide ions are still highly desired in order to achievethe fine manipulation on the spectral profile and luminescence intensityratio (LIR). Herein we report on the synthesis and PL emission propertiesof monodisperse spherical (Au core)@(Y-(V,P)-O-4:Eu) nanostructures,which integrate the plasmonic and luminescent units into an individualcore@shell structure. The localized surface plasmon resonance adjustedthrough control of the size of the Au nanosphere core enables thesystematic modulation of the selective emission enhancement of Eu3+. As revealed by single-particle scattering and PL measurements,the five luminescence emission lines of Eu3+ originatingfrom the D-5(0,1) excitation states are affectedby the localized plasmon resonance to different extents, which aredependent on both the dipole transition nature and the intrinsic quantumyield of the emission line. Based on the plasmon-enabled tunable LIR,high-level anticounterfeiting and optical temperature measurementsfor photothermal conversion are further demonstrated. Our architecturedesign and PL emission tuning results offer many possibilities forconstructing multifunctional optical materials by integrating plasmonicand luminescent building blocks into hybrid nanostructures with differentconfigurations.