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Y2O3 codoped with different Zr4+ (10% mol, 30% mol, and 49% mol) and constant Er3+ (2% mol) ions were successfully prepared via the laser annealing method. According to the XRD data, the lattice parameters decrease with the increase of Zr4+, and the grain size increases with Zr4+. The crystal space group switches from Ia‐3 to Fm‐3 m at a Zr4+ concentration of 49% mol. As the concentration of doped...