Structural analysis, fluorescence characteristics, and thermal radiation phenomena of Y2O3:Al3+/Er3+materials doped with varying concentrations of Al3+ ions

In this study, Y2O3: Al3+/Er3+ crystals materials (AYE) were synthesized through laser annealing. The structure and spectral characteristics of Al3+ ions doping in Y2O3: Er3+ crystals are discussed in detail. With the incorporation of Al3+ ions, the AYE structure experiences a phase transformation characterized by a sequence of monophasic and biphasic states: monophasis-biphase-biphase-monophasis-biphase. When the concentration of Al3+ ions is 0-50 %, AYE has fluorescence characteristics under 980 nm excitation, and its I-563 nm/I-799 nm shows non-thermal coupling phenomenon at low temperature and thermal coupling phenomenon at high temperature, with a maximum relative sensitivity of 1.643 %K-1. When the concentration of Al3+ ion is 60 %-98 %, AYE shows a strong thermal radiation phenomenon under the excitation of a 980 nm laser. Its initial laser power density is as low as 0.71 W/mm(2). This is about three times lower than the initial power density of thermal radiation generated by the same level of material. In summary, Y2O3: Al3+/Er3+ crystals materials have a broad application prospect in the field of temperature sensing and thermal radiation materials.