Abstract: The utilization of spark plasma technology, known for its rapid low-temperature sintering through multi-field coupling, is prevalent across various industrial sectors due to its benefits of high efficiency, energy conservation, and eco-friendliness. In this work, Ce3+ and Yb3+ co-doped yttrium aluminum garnet rare-earth phosphors were synthesized using spark plasma sintering. The structure and morphology of the rare-earth phosphors were analyzed through X-ray diffraction and scanning electron microscopy. Additionally, their spectral characteristics were examined. The findings demonstrate that spark plasma sintering effectively enables the incorporation of Ce3+ and Yb3+ ions into the yttrium aluminum garnet lattice, resulting in a lattice constant of 1.200 5 nm. The particle size of the rare-earth phosphors post-grinding ranged from 1 μm to 2 μm. The emission spectra peaks of YAG:Ce3+, Yb3+ rare-earth phosphors were identified at 552 nm and 720 nm. Evaluation of photovoltaic cell with photo-conversion capabilities revealed a notable enhancement in relative external quantum efficiency within the 500—1 000 nm range. Furthermore, the short-circuit current density reached 35.95 mA/cm2, representing a 0.51 mA/cm2 improvement, and an increase in photovoltaic conversion efficiency of 1.91% was observed.
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