Abstract
Glasses with compositions of (95.8-x) SiO2–4Al2O3–xP2O5–0.2Nd2O3 (in mol%, x=0–10) were prepared. Structural variation caused by P5+ was investigated by Judd–Ofelt parameters and Raman spectra. Results reveal that Nd3+ preferentially coordinates to PO sites at molar ratio of P5+/Al3+>1 and thus it leads to a sudden change in fluorescence effective linewidth, stimulated emission cross section, fluorescence lifetime and non-radiative transition rate of Nd3+ ions. The fluorescence lifetime changes in the range of 315–379μs. The emission cross section changes in the range of 1.39–1.79×10−20cm2. With the increase of P5+/Al3+ ratio, the fluorescence effective linewidth varies from 45.77 to 37.03nm. The shortest fluorescence lifetime was observed at molar ratio of P5+/Al3+=1. The maximum non-radiative transition rate of 1694/s occurred at molar ratio of P5+/Al3+=1.25. The highest emission cross section of 1.79×10−20cm2 was obtained at the highest P5+/Al3+ molar ratio. Furthermore, structure–property relationship in these glasses was discussed through Judd–Ofelt parameters and luminescent behaviors.
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