Eu and Tb upconversion intermediated by interparticle energy transfer in functionalized NaLnF nanoparticles.

Lanthanide (Ln)-doped sodium gadolinium tetrafluoride (NaGdF) nanoparticles have been excelled as attractive upconversion systems for anti-counterfeiting or energy conversion for instance, with a special interest in the visible upconversion of Eu and Tb. The core@shell architecture has enabled the bright upconversion of Eu and Tb in this matrix by interfacial energy transfer sensibilized by the Tm/Yb pair. Another approach to enable Eu and Tb upconversion could be the interparticle energy transfer (IPET) between Ln-doped sensitizer and acceptor nanoparticles.