Understanding Energy Transfer Mechanisms for Tunable Emission of Yb3+Er3+ Codope

Energy transfer (ET) is an important route to manage the population density of excited states, giving rise to spectrally tunable emission that is valuable for multicolor imaging and biological tracking. In this paper, a case study of GdF3 nanoparticles (NPs) codoped with Yb3+ and Er3+ was used to ex