Effect of Li₂O substitution on structures and properties of Nd³⁺‐doped Al(PO₃)₃‐Li₂O glasses

Abstract

99.8[(1−x%)Al(PO3)3−x%Li2O]‐0.2Nd2O3 glasses (mol%, x = 0, 5, 10, 15, 20) were prepared by high‐temperature melt and quenching method. The effect of Li2O replacing Al(PO3)3 on the physical, mechanical, and optical properties was correlated with the network structures and the local environment around Nd3+ ions, which were obtained via Raman scattering spectra, solid‐state nuclear magnetic resonance (SSNMR), and pulse electron paramagnetic resonance (EPR) techniques. SSNMR results indicate that the addition of Li+ ions cannot affect the connectivity between P and Al while it can break the P‐O‐P linkages resulting in the depolymerization of glass networks. EPR spectra indicate an increasing engagement of lithium around Nd3+ ions with the increase of Li2O. The Judd‐Ofelt (J‐O) parameters Ω4,6 increase, but Ω2 decreases. The emission cross section at 1053 nm and quantum efficiency are improved by 27% and 31%, respectively. The work is helpful for understanding the evolution mechanism of emission properties and structures in Nd3+‐doped Al(PO3)3‐Li2O phosphate glasses.

Luminescence properties and energy transfer of Nd3+- Er3+/ Nd3+-Pr3+ co-doped LFP glasses system

“…This report leads to the emission spectra being wider than our present work. However, M. Guo et al reported that their Nd 3+ -doped ALP sample has FWHM in the range of 23–24.4 which is smaller than our sample which was co-doped with Nd 3+ -Er 3+ ions [ 25 ]. Additionally, it demonstrates that our glass sample exhibits a lower value when excited by an 808 nm laser diode than when excited by a 481 nm laser, making it more appropriate for laser applications.…”