Abstract
Er3+-doped LnP5O14 (Ln = La, Gd) ultraphosphates were synthesized via solid state reaction. The phase purity and the structure of samples were characterized by the X-ray powder diffraction (XRD) and the Fourier transform infrared spectroscopy (FTIR). The optical properties were investigated by analysis of the photoluminescence emission spectra recorded in 430–900 nm and 1450–1600 nm wavelength range at room temperature. Upon visible excitation, the Ln1-xP5O14:xEr3+ (Ln = La, Gd; x = 1–5%) phosphors exhibit bright green emission bands, corresponding to transitions from the 2H11/2 and 4S3/2 erbium levels to the 4I15/2 ground state and week red luminescence related to the 4F9/2 → 4I15/2 transition. A strong luminescence at 1.53 nm in the infrared (IR) region due to 4I13/2 → 4I15/2 transition has been observed in Ln0.95P5O14:0.05Er3+ (Ln = La, Gd) phosphors under the excitation by 488 nm laser light. The experimental results suggest that Er3+ activated ultraphosphates hosts are useful for solid-state lasers applications.
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