Enhanced Optical Response of Alumino-borophosphate Glasses Embedded with Gold Nanoparticles for Photonic Application

Abstract

The demand for efficient, energy-saving, and environmentally friendly lighting devices remains a critical pursuit in materials science. In response to this need, we have developed a novel series of gold nanoparticles embedded in alumino-borophosphate glasses, using the conventional melt quenching technique. These glasses were subjected to both experimental and theoretical analyses to evaluate their potential for lasing and light-emitting applications. X-ray diffraction (XRD) confirmed the amorphous structure of the glass, while high-resolution transmission electron microscopy (HRTEM) images revealed spherical gold nanoparticles, averaging 15.01 nm in size, embedded within the glass matrix. The experimental absorption and photoluminescence spectra were further validated through Judd–Ofelt intensity and radiative parameter calculations. Notably, the incorporation of gold nanoparticles significantly enhanced the optical properties of the glass. In particular, the glass sample containing 0.7 mol% of gold nanoparticles exhibited a high branching ratio (72%), stimulated emission cross-section (30.24 × 10-20 cm²), quantum efficiency (95%), and exceptional color purity (89%). The strong optical response achieved in this study underscores the suitability of these fabricated glasses for the development of an innovative solid-state red laser operating at 611 nm.