Abstract Square-like KLa(MoO4)2: Yb3+/Er3+ mono-disperse crystals were synthesized by hydrothermal process. Their up-conversion luminescence (UCL) emissions were contributed by green (2H11/2/4S3/2 → 4I15/2) and red light radiation (4F9/2 → 4I15/2) transitions of Er3+ under 980 nm. Energy transfer (ET) from Yb3+ to Er3+ were proved by the lifetimes of green emissions and the UCL mechanisms were also discussed according to power-dependent UCL intensities. The optical temperature sensing characteristics were explored by thermal coupled levels (TCLs) of Er3+ (2H11/2/4S3/2 → 4I15/2) from 283 to 493 K and the sensitivity reached 1.7 × 10−2 K-1 at 493 K. The results indicate that the phosphor KLa(MoO4)2: Yb3+/Er3+ as a kind of potential candidates could be applied to the electronic components temperature sensing.

中文翻译：

---

方形 KLa(MoO4)2: Yb3+/Er3+ 上转换磷光体的光学测温特性

摘要 采用水热法合成了方形KLa(MoO4)2:Yb3+/Er3+单分散晶体。它们的上转换发光 (UCL) 发射是由 Er3+ 在 980 nm 以下的绿光 (2H11/2/4S3/2 → 4I15/2) 和红光辐射 (4F9/2 → 4I15/2) 跃迁贡献的。绿色排放的寿命证明了从 Yb3+ 到 Er3+ 的能量转移（ET），并且还根据功率相关的 UCL 强度讨论了 UCL 机制。通过 Er3+ (2H11/2/4S3/2 → 4I15/2) 从 283 到 493 K 的热耦合能级 (TCL) 探索光学温度传感特性，并且在 493 K 时灵敏度达到 1.7 × 10−2 K-1。结果表明，荧光粉KLa(MoO4)2:Yb3+/Er3+作为一种潜在的候选材料可应用于电子元件的温度传感。