Er3+-doped SiO2-based glasses-An exploration of structural, visible, chromatic, and NIR fluorescence characteristics

Abstract

SiO2-based glasses doped with 1 mol% Er3+ were fabricated via melt-quench process and their structural and visible and NIR (near-infrared) fluorescence features have been investigated. Calculated Judd-Ofelt (J-O) intensity parameters that were deduced from absorption spectra are applied to reckon different radiative factors. Visible emission spectra and decay profiles (for S-4(3/2) & RARR; I-4(15/2) transition) were registered upon lambda(exci.)= 379 nm. CIE (Commission International de I'Eclairage), CCT (correlated color temperature), and CP (color purity) values were evaluated from the emission spectra. Also, a NIR luminescence band (I-4(13/2) & RARR; I-4(15/2) transition) was identified by 980 nm LD (laser diode). Later, emission cross-section [(sigma(emi)) stimulated, (sigma(M)(emi)) from Mccumber theory] values were computed for observed NIR emission. Highest sigma(emi) and gain bandwidth (sigma(emi) x delta lambda(eff)) were obtained to be 9.18x10(-21) cm(2) and 517x10(-28) cm(3) accordingly for I-4(13/2) & RARR; I-4(15/2) transition.