Simultaneous Enhancement and Modulation of Upconversion by Thermal Stimulation in Sc2Mo3O12 Crystals
Simultaneous Enhancement and Modulation of Upconversion by Thermal Stimulation in Sc2Mo3O12 Crystals
复制标题
Sc2Mo3O12 晶体中热刺激同时增强和调制上转换
DOI：
10.1021/acs.jpclett.0c00628
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发表时间：
2020
影响因子：
5.7
通讯作者：
Wang Feng
中科院分区：
文献类型：
--
作者：
Zou Hua;Chen Bing;Hu Yifeng;Zhang Qiwei;Wang Xusheng;Wang Feng
合理控制光致发光对温度变化的影响，对于基础研究和技术应用具有重要意义。在这里，我们报道了Yb/Ho共掺Sc2Mo3O12晶体的上转换发光与温度的反常关系。通过利用晶格的负热膨胀，当温度从303K上升到573K时，促进了稀土掺杂之间的能量转移，导致发射的∼提高了5倍。同时，由于选择性能态的同时热猝灭，发射轮廓也发生了很大的变化，对应于颜色从绿色到红色的明显转变。通过关联Ho3+掺杂离子的红绿发射强度比与温度的关系，构建了比发光温度计，在543K下的最大灵敏度为2.75%K-1。由于Sc2Mo3O12晶体具有热稳定性和非吸湿性，我们的研究结果揭示了在环境空气中通过温度高度可逆控制上转换的一般方法。
Rational control of photoluminescence against a change in temperature is important for fundamental research and technological applications. Herein, we report an anomalous temperature dependence of upconversion luminescence in Yb/Ho co-doped Sc2Mo3O12crystals. By leveraging negative thermal expansion of the crystal lattice, energy transfer between the lanthanide dopants is promoted as the temperature is increased from 303 to 573 K, resulting in an ∼5-fold enhancement of the emission. Meanwhile, the emission profile is also substantially altered due to the concurrent thermal quenching of selective energy states, corresponding to a clear shift in color from green to red. Via correlation of the red-to-green emission intensity ratio of Ho3+dopant ions with temperature, a ratiometric luminescence thermometer is constructed with a maximum sensitivity of 2.75% K–1at 543 K. As the Sc2Mo3O12crystals are thermally stable and nonhygroscopic, our findings highlight a general approach for highly reversible control of upconversion by temperature in ambient air.