Comparative Study of Photoluminescence Characteristics of Ag-Dy3+ Co-doped Host Matrices (Silica Xerogels and PVA Films)

Abstract

In this study, two host structural materials” silica Xerogels and Poly vinyl alcohol films’’ doped Ag-Dy³⁺ at specific concentration of AgNPs where Synthesized using sol-gel rout and chemical method. Spectroscopic analysis of silver nanoparticles in both hosts revealed a distinct surface plasmon resonance (SPR) band centered at the special range from 426 to 429 nm. Absorption and photoluminescence (PL) spectra 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. PL analysis of both silica xerogels and 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 such as nanoparticles, which facilitates efficient energy transfer to the Dy³⁺ ions. Consequently, the emission cross-section increases with concentration up to 0.0055% for silica xerogels, and the same behavior of PVA films was seen at up to 0.0086%.