Correction: Synthesis and up/down conversion luminescence properties of Na<sub>0.5</sub>R<sub>0.5</sub>MoO<sub>4</sub>:Ln<sup>3+</sup> (R<sup>3+</sup> = La, Gd), (Ln<sup>3+</sup> = Eu, Tb, Dy, Yb/Er) thin phosphor films grown by pulsed laser deposition technique
RSC advances