Photon Cascade Emission of Gd 3+ in Na(Y,Gd)FPO 4

The VUV−vis spectroscopic properties of Gd 3+ in Na(Y,Gd)FPO 4 are reported. The photon cascade emission was observed under 8 S 7/2 → 6 G J excitation in which 6 G J → 6 P J, 6 I J emissions of Gd 3+ in the orange/red and near-IR range are followed by ultraviolet emission of 6 P J → 8 S 7/2 transitions. We demonstrate systematically the emission decays and concentration-quenching characteristics of 6 G J → 6 P J and 6 P J → 8 S 7/2 transitions under excitation into 6 G J levels. The effect of temperature on the 6 G J → 6 P J emissions is also presented.