Enhanced upconversion emission in Er3+/Yb3+-codoped Al2Mo3O12 microparticles via doping strategy: Towards multimode visual optical thermometer

To explore highly sensitive luminescent materials, a series of Er3+/Yb3+-codoped Al2Mo3O12 microparticles were prepared through a high-temperature solid-state reaction method. The phase structure, light harvest ability, morphology, and upconversion (UC) emission characteristics of these synthesized microparticles were investi-gated systematically. Excited at 980 nm, glaring visible UC emissions are gained in the developed specimens, in which the optimal doping content for Yb3+ is 7 mol% and the two-photon absorption process contributes to the UC emission mechanism. Based on the fluorescence intensity ratio technology, the thermometric properties of resultant microparticles are studied by analyzing the temperature-dependent green UC emissions of Er3+ arising from the thermal coupling energy levels. The maximum absolute and relative sensitivities of final products are 0.011 K-1 and 1.09% K-1, respectively, and they are barely influenced by Yb3+ contents. Besides, via exploring the lifetimes of 2H11/2 and 4S3/2 levels of Er3+ at various temperatures, the relative sensitivities of resultant microparticles are determined to be 0.27% and 0.26% K-1, respectively. Furthermore, the newly developed microparticles can be adopted to fabricate fluorescent ink to realize optical anti-counterfeiting and visual tem-perature monitoring. Our studies demonstrate that Er3+/Yb3+-codoped Al2Mo3O12 microparticles with strong UC emissions possess great potential for multimode visual optical thermometry applications.

Automated summary

Er3+/Yb3+-codoped Al2Mo3O12 microparticles were synthesized through high-temperature solid-state reaction method, and their structure and luminescent properties were systematically investigated. The results show that these microparticles exhibit strong upconversion emissions and excellent thermometric properties, making them suitable for applications such as optical anti-counterfeiting and temperature monitoring.