A strategy to achieve efficient green‐emission dual‐mode luminescence of Yb <sup>3+</sup> , Er <sup>3+</sup> doped NaBiF <sub>4</sub>
Jinhui Xie, Jue Wang, Gui-Hua Qiu, Xibing Li, Wentao Huang, Rui-Rong Zhang, Tong Lin, Lixi Wang, Qitu Zhang
Abstract
Abstract A series of hexagonal phase NaBiF 4 : x Yb 3+ , y Er 3+ were successfully synthesized by solvothermal method. The morphology, phase structure, up‐conversion luminescence and down‐conversion luminescence properties of Yb 3+ and Er 3+ doping concentration and the energy transfer mechanism were studied. It shows that the doping of Yb 3+ and Er 3+ does not cause the phase transition of NaBiF 4 , but influences its morphology. In the NaBiF 4 : Yb 3+ , Er 3+ , Yb 3+ can transfer energy with Er 3+ , enhancing up‐conversion green emission. With Yb 3+ doping concentration increasing, the up‐conversion red‐green ratio will increase while the down‐conversion intensity of the green emission decreases and that of the red emission increases. Considering the potential application of NaBiF 4 : x Yb 3+ , y Er 3+ phosphors in optical illumination, the thermal stability was carried out.