Luminescence properties of Eu3+:NaGd(WO4)2 nanoparticles and nanorods

The NaGd(WO4)2:Eu3+ phosphors were prepared by the microemulsion mediated hydrothermal method. The morphology and size of the samples could be dependent on the pH in the initial solution. These phosphors obtained had a strong absorption at 395 nm matching with the popular emission of near-UV LED chips, and could emit intense red light at 616 nm. The small ellipsoid-like particles or short rods were provided with large parameters of oscillator strength ω2 and asymmetry ratio. Compared to the ellipsoid-like phosphors, the rod-like phosphors took on stronger emission, longer lifetime and larger quantum efficiency. This work demonstrated that the one-dimension NaGd(WO4)2:Eu3+ phosphors might be a more favorable device than zero-dimension ones for photoluminescence.

Graphical AbstractExcitation spectra (a) and emission spectra (b) of Eu3+:NaGd(WO4)2 samples (the monitoring and excited wavelengths are 616 and 395 nm, respectively)Figure optionsDownload as PowerPoint slide