Optical Absorption and NIR Photoluminescence of Nd3+-Activated Strontium Phosphate Glasses

Abstract

Strontium phosphate glasses with various concentrations of Nd 2 O 3 have been prepared by melt quenching method. Absorption and photoluminescence spectra and lifetime measurements have been carried out to obtain the optical properties of these glasses. From the absorption spectrum, intensity and radiative parameters have been evaluated using Judd-Ofelt analysis. Nearinfrared photoluminescence spectra consist of three bands centered at 875 nm, 1056 nm and 1327 nm, among which the highest intensity has been noticed for the band at 1056 nm that corresponds to the 4 F 3/2 fi 4 F 11/2 transition of Nd 3+ ion. Laser parameters such as branching ratio, band width, stimulated emission cross section and gain bandwidth for the 4 F 3/2 fi 4 F 11/2 transition are found to be 0.52, 28 nm, 2.31 9 10 À20 cm 2 and 6.5 9 10 À26 cm 3 , respectively. Decay curves of the 4 F 3/2 level of Nd 3+ ions exhibit a single exponential nature at lower concentrations, while they become non-exponential at higher concentrations (‡ 0.1 mol.%) due to non-radiative energy transfer processes. This feature is also associated with shortening of lifetime from 307 ls to 82 ls when the Nd 3+ ion concentration increases from 0.1 mol.% to 4.0 mol.%. The results have been compared with those of barium and magnesium phosphate glasses and commercial glasses. The results suggest that these glasses have potential applications as infrared laser materials at 1.05 lm.

Effect of Nd3+ Doping on Structural, Near-Infrared, and Cathodoluminescent Properties for Cadmium Tantalate Phosphors

“…Among RE 3+ (trivalent) ions, Nd (neodymium) is one of the earliest RE 3+ ions used in solid-state lasers. Therefore, Nd 3+ activated materials are wellknown as solid-state phosphors due to their laser emissions at beneficial wavelengths such as 4 F3/2→ 4 I9/2 transition and also the other possible transitions 4 F3/2→ 4 I15/2, 4 F3/2→ 4 I13/2 and 4 F3/2→ 4 I11/2 (15)(16)(17)(18)(19)(20)(21)(22). Among the 4 F3/2→ 4 IJ transitions of Nd 3+ ion, the 4 F3/2→ 4 I9/2 transition at 880 nm finds application as a powerful diode laser transition.…”

Evaluation of the Structural, Near-Infrared Luminescence, and Radioluminescence Properties of Nd3+ Activated TTB-Lead Metatantalate Phosphors

“…Therefore, the RE ion activated phosphors lead to numerous innovations in the development of new generation devices in various fields such as screen-display technology, lighting technology, and optical data communication due to some positive features such as long life, energy saving, improved physical durability, small size, fast switching, high efficiency, and environmental friendliness (1- 19). The trivalent neodymium ion (Nd 3+ ), one of the oldest trivalent lanthanide ions used in solid-state laser, is well known for its useful laser transitions such as F3/2→ 4 I9/2, 4 F3/2→ 4 I11/2, and 4 F3/2→ 4 I13/2 (20)(21)(22)(23)(24)(25)(26)(27)(28)(29). The 4 F3/2→ 4 I9/2 transition at 880 nm finds application as a powerful diode laser transition while the 4 F3/2→ 4 I11/2 transition stands out due to its easily operated at room temperature and pumped efficiently by flash lamp (29).…”