The influence of cation additives on the NIR luminescence intensity of Er ³⁺ -doped borate glasses

Abstract

Er3+-doped 25BaO-(25-x)SiO2-xAl2O3-25B2O3 transparent glasses are prepared with x = 0, 12.5 and 25 by a solid-state reaction. The Er-related NIR luminescence intensity, which corresponds to the transition of 4I15/2-4I13/2, is obviously altered with different silicon/aluminum ratios. The Judd-Ofelt parameters of the Er3+ ions are adopted to explain the intensity change in the NIR fluorescence, and the Raman scattering intensity versus the amount of Al and/or Si components are discussed. The spectra of the three samples are quite similar in the peak positions, but different in intensity. The maximal phonon density of state for the samples is calculated from the Raman spectra and is correlated to the NIR luminescence efficiency.

Influence of Al 3+ doping on the energy levels and thermal property of the 3.5MgO·0.5MgF 2 ·GeO 2 :Mn 4 + red-emitting phosphor

“…[30,31] It was suggested in Refs. [23] and [32] that the nonradiative relaxation probability can be described by W NP = C[n(T ) + 1] P exp(−α∆E), in which constant C is dependent on the phonon density of state ρ(ω P ) [33] and expressed as C ∝ ρ(ω) 5/3 . The maximum phonon density of state ρ m (ω P ) is typically described as the integral area ratio of the band at 827 cm −1 -867 cm −1 , corresponding to maximum phonon energy, to the whole band of the Raman spectrum.…”