NaBiF${}_4$: Er${}^{3+}$, Yb${}^{3+}$ upconversion particle as a multi-functional bio-marker

Atanu Ghosh, Krishna Kumari Swain, Agniva Das +6

The paper presents bismuth‑doped NaBiF4:Er³⁺,Yb³⁺ upconversion particles that show markedly higher quantum yield and controllable photoluminescence using two infrared lasers, enabl…