Intense Green Upconversion Luminescence in Er³⁺:Yb³⁺ Codoped Fluorophosphate Glass Ceramic Containing SrTe₅O₁₁ Nanocrystals

Er³⁺:Yb³⁺ codoped tellurite-fluorophosphate (TFP) glass ceramic exhibits much stronger upconversion luminescence. The intensity of the 540nm green light and 651nm red light of the TFP glass ceramic is 120 times and 44 times stronger than that of the fluorophospahte (FP) glass, respectively. XRD analysis shows that the nanocrystal in TFP glass ceramic is SrTe₅O₁₁. TFP glass ceramic also displays much higher upconversion fluorescence lifetime and crystallization stability. The narrow and strong peak at 540nm is very
ideal for practical upconversion luminescence realization. This work is a new trial for exploring non-PbF₂ involved nanocrystal upconversion glass ceramics.