Mechanism of Au core-shell nanoparticle (Au@SiO₂) enhancement of europium luminescence

To enhance luminescence emitted by rare-earth organic thin films, gold nano core-shell structures (Au@SiO₂) were introduced during preparation of rare-earth luminescent films． A drop-casting method was used, Au@SiO₂ nanostructures with different molar concentrations were applied onto quartz slides． A mixture of Eu(dbm)₃phen: PMMA: CH₂Cl₂ was then spin-coated onto quartz slides to fabricate thin films． Characterizations of these samples revealed that introducing Au@SiO₂ significantly enhanced film luminescence intensity． Maximum excitation and luminescence enhancement factors were 279.1% and 222.9% respectively, with extended fluorescent lifetime． Incorporating Au@SiO₂ into the fabrication process of rare-earth luminescent films effectively improves their luminous performance, with promising application potentials．