Tm³⁺/Yb³⁺ co-doped CaBi₄Ti₄O₁₅ (CBT) bismuth layer structured ferroelectric ceramics were synthesized by a solid state reaction method and their microstructural and up-conversion (UC) luminescence properties were studied. Under 980-nm laser excitation, a strong blue light (475 nm) and a weaker red (650 nm) UC emission band were obtained, in which a three-photon UC mechanism is dominant, contributing to the transitions of ¹G₄ → ³H₆, and ¹G₄ → ³F₄. The optimal UC emission intensity was observed in the CBT: 0.005Tm³⁺/0.04Yb³⁺ samples. The transition ¹G₄ → (³H₆, ³F₄) of Tm³⁺ indicated a temperature-dependent behavior in the 163–503 K range. The maximum sensitivity was found to be 0.016 K⁻¹ at 503 K based on the blue and red emissions. This indicates that CBT: 0.005Tm³⁺/0.04Yb³⁺ ferroelectric ceramics have great potential for applications in optical temperature sensors.

通过固相反应法合成了Tm ³⁺ / Yb ³⁺共掺杂CaBi ₄ Ti ₄ O ₁₅（CBT）铋层结构铁电陶瓷，研究了它们的微结构和上转换（UC）发光性能。在980 nm激光激发下，获得了较强的蓝光（475 nm）和较弱的红色（650 nm）UC发射带，其中三光子UC机理占主导地位，有助于¹ G ₄  →  ³的跃迁。H ₆和¹ G ₄  →  ³ F ₄。在CBT中观察到最佳的UC发射强度：0.005Tm ³⁺ /0.04Yb ³⁺样品。过渡¹ ģ ₄  →（³ ħ ₆，³ ˚F ₄的Tm）³⁺表示在163-503 K范围之外依赖于温度的行为。基于蓝光和红光发射，发现最大灵敏度为503 K时为0.016 K ^-1。这表明CBT：0.005Tm ³⁺ /0.04Yb ³⁺铁电陶瓷在光学温度传感器中具有巨大的应用潜力。