Luminescent thermometry has been irreplaceable role in non-contact temperature sensing. However, the relative sensitivity () in some rare earths doped fluoride up-conversion materials still limited below 1% K. Herein, Eu doping LiYGeO (LYGO) phosphors enabled ratio-metric thermometer based on thermal enhancement of Eu−O charge transfer band (CTB) and thermal quenching of 4f-4f transition. The was achieved 0.64% K in LYGO: Eu at 313 K. Furthermore, we presented a temperature-responsive phosphor through Bi/Eu co-doped LYGO, the excitation intensities of Bi ions decreased significantly with rising temperature, which realized more than twice of magnitude changes in the (1.76% K). In addition, LYGO: Eu phosphors also featured excellent red emission and high thermal stability. All the results indicated that LYGO: Eu and LYGO: Eu, Bi phosphors can be potentially candidate for white light-emitting diode (WLED) and temperature sensing.

中文翻译：

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通过 Bi3+ 掺杂增强 LiYGeO4：Eu3+ 荧光粉的温度传感特性

发光测温在非接触式温度传感中已具有不可替代的作用。然而，一些稀土掺杂氟化物上转换材料的相对灵敏度 () 仍然限制在 1% K 以下。本文中，Eu 掺杂 LiYGeO (LYGO) 荧光粉基于 Eu−O 电荷转移带的热增强实现了比率测量温度计 ( CTB) 和 4f-4f 转变的热淬火。在313 K下，LYGO: Eu中的K达到了0.64%。此外，我们通过Bi/Eu共掺杂LYGO提出了一种温度响应型荧光粉，Bi离子的激发强度随着温度的升高而显着降低，实现了两倍以上(1.76% K) 的幅度变化。此外，LYGO:Eu荧光粉还具有优异的红光发射和高热稳定性。所有结果表明，LYGO: Eu 和 LYGO: Eu, Bi 荧光粉有可能成为白光发光二极管 (WLED) 和温度传感的候选材料。