Ce3+/Tb3+ co-doped β-NaYF4 dual-emitting phosphors for self-referencing optical thermometry

Traditional FIR (fluorescence intensity ratio)-based optical thermometers, requiring narrow energy gap between two thermally coupled states (TCS) of single rare-earth ion, have inherent drawbacks including low signal discriminability and large measuring error. To overcome the intrinsic limitation, a new thermometry strategy involving the usage of dual-emitting activators with diverse temperaturedependent emission behaviours has been proposed. Impressively, beta-NaYF4: Ce3+/Tb3+ phosphor exhibits good temperature sensing performance, excellent signal discriminability and superior thermal stability by using the linearly temperature-dependent FIR between Ce3+ and Tb3+ as detecting parameter. Hopefully, the developed dual-emitting sample could have a promising application in self-calibrated luminescent thermometry and this strategy provides a reference for developing high-performance optical thermometers. (C) 2018 Elsevier B.V. All rights reserved.