Pure red visible emission via three photon excitation of colloidal Na3ZrF7:Er na

We provide the first demonstration of pure red emission in the visible light region via three-photon excitation in monodisperse Na3ZrF7:Er nanoparticles (NPs) by using a laser operating in the telecommunication band. NPs of ~22 nm in diameter are synthesized at 260°C by the thermal decomposition met