Judd-Ofelt analysis and NIR spectroscopy properties of Nd3+-doped Na2O/NaF-Al2O3-Y2O3-P2O5 glass and transparent glass-ceramics containing NaYP2O7 crystals
Haozhang Liang, Xiangtao Lin, Nanshan Ma, Juxia Tong, Longqing He, Zhiwei Luo, Lingying Ye, Anxian Lu
Abstract
In the present work, the Nd 3+ -doped Na 2 O/NaF-Al 2 O 3 -Y 2 O 3 -P 2 O 5 glass and transparent glass-ceramics were fabricated by conventional melting-quenching and subsequent heat treatment. The glass structure was studied by XRD , DSC , and FTIR spectrum, the fluorophosphate glass exhibits a more compact cross-link network. The UV–Vis–NIR absorption spectra , Judd-Ofelt theory, and photoluminescence spectra were used to explore the absorption and NIR spectroscopic features of the Nd 3+ -doped phosphate and fluorophosphate glasses. Under the excitation of 582 nm, the intense NIR emission in the Nd 3+ -doped glasses originating from the internal transition 4 F 3/2 → 4 I J/2 (J = 13, 11 and 9) was observed, and the transition 4 F 3/2 → 4 I 11/2 (1053 nm) is the most dominate. The transparent glass-ceramics (GC) was fabricated via heat treating on the precursor glass (PG) at T g +100 °C, and the precipitation of NaYP 2 O 7 crystals in GC was confirmed by XRD and SEM. With the benefit of the existence of the NaYP 2 O 7 crystals, the Nd 3+ -doped GC exhibits higher NIR emission intensity, higher quantum efficiency (72.85% and 84.11%), larger σ(λ p ) values of 4.24×10 -20 cm 2 and 4.86×10 -20 cm 2 , larger σ × Δλ eff values of 10.22×10 -26 cm 3 and 11.67×10 -26 cm 3 than that of PG. These results indicate that the Nd 3+ -doped phosphate and fluorophosphate glasses and glass-ceramics may be used as a gain medium for 1053 nm laser emission.