Up- and downconversion emission and sensing sensitivity is studied in Er³⁺/Yb³⁺ co-doped biocompatible Ca₃(PO₄)₂ phosphor synthesized via co-precipitation (CPT) and hydrothermal (HYDT) methods. The emission bands are observed at 523, 549 & 656 nm due to the ²H_11/2→⁴I_15/2, ⁴S_3/2→⁴I_15/2, and ⁴F_9/2→⁴I_15/2 transitions, respectively on excitation under 980 nm diode laser. The sample prepared via hydrothermal method has shown higher upconversion emission as compared to the sample prepared via co-precipitation method. The temperature sensing performance on green upconverted-emission from two thermally coupled ²H_11/2 and ⁴S_3/2 levels of Er³⁺ ion was measured in the 300–473 K temperature range and maximum sensor sensitivity of 0.34 %/K for HYDT and 0.26 %/K for CPT sample at 300 K is observed. Cell survivability at various sample concentrations (0 μM to 100 μM) was studied and finally, no significant toxicity on WI-38 cells was assessed by the MTT assay method.

研究了通过共沉淀（CPT）和水热法（HYDT）合成的Er ³⁺ / Yb ³⁺共掺杂生物相容Ca ₃（PO ₄）₂荧光粉的上下转换发射和传感灵敏度。发射带在523，549和656nm处观察到归因于² ħ _11/2 → ⁴我_15/2，⁴小号_3/2 → ⁴我_15/2，和⁴ ˚F _9/2 → ⁴我_{15 / 2}分别在980 nm二极管激光器的激发下发生跃迁。与通过共沉淀法制备的样品相比，通过水热法制备的样品显示出更高的上转换发射。在300–473 K的温度范围内测量了两个热耦合的² H _11/2和⁴ S _3/2能级的Er ³⁺离子在绿色上转换发射时的温度感测性能，最大传感器灵敏度为0.34％/ K在300 K下观察到CPT样品的HYDT和0.26％/ K。研究了在各种样品浓度（0μM至100μM）下的细胞存活率，最后，MTT分析方法未评估对WI-38细胞的明显毒性。