Co²⁺-doped ErBO₃ microspheres as high-efficiency laser absorption at 1540 nm wavelength

1540 nm lasers are widely used for excellent anti-interference capability and atmospheric transmission, whose corresponding suppressing materials are still lack of investigation Er³⁺ ions can effectively absorb 1540 nm lasers due to energy level transitions near this wavelength. And the absorption effect could be further enhanced by doping with heterogeneous metal ions. Herein, Co²⁺ has been doped into ErBO₃ with different concentrations, which could induce lattice contraction of Er³⁺ ion cells. The ErBO₃ samples prepared by solvothermal and calcination processes are characterized by “flower-like” porous microspheres at 800 °C. The influence of different calcination temperatures and molar ratios of raw materials on the reflection performance of 1540 nm laser light was examined. The laser reflectance of the sample was reduced to 0.707 % by doping with 20 mol% Co²⁺. This Co²⁺ doped ErBO₃ material exhibits significant potential in 1540 nm laser protection applications.