Enhancement of Photoluminescence Characteristics of Dysprosium Ions in Ag-Dy3+ Co-doped PVA Network

Abstract

In this study, Dy³⁺ doped and Ag- Dy³⁺ embedded Poly vinyl alcohol (PVA) host were synthesized at specific concentration of AgNPs and at different concentration of Dy³⁺ions using chemical method. Spectroscopic analysis of silver nanoparticles in such polymer host revealed a distinct Surface Plasmon Resonance (SPR) band centered at 426 nm. Absorption and photoluminescence (PL) spectra of DyCl₃.6H₂O in water solution were recorded at room temperature, as a function of Dy³⁺ concentration. Prominent emission bands from Dy³⁺ ions were observed at ⁴F_9/2 → ⁶H_13/2 and ⁴F_9/2 → ⁶H_15/2 under 350 nm excitation. The emission cross-section (σ_em) of the transtion⁴F_9/2 → ⁶H_13/2 have been determined for doped and co-doped samples. PL analysis of co-doped PVA films demonstrated that the presence of silver nanoparticles significantly enhanced the PL intensity of Dy³⁺ ions. This enhancement is attributed to the strong local electric field generated by the SPR effect of metal nanoparticles. The Commission International deI'Eclairage (CIE) chromaticity diagram has been used for investigating and observing white light emission, with all co-doped samples having color coordinates in the white range.