Judd-Ofelt analysis of Ho3+-doped CaYAlO4 single crystal

Highlights: • A Ho³⁺:CaYAlO₄ single crystal has been grown by the Czochralski method. • Judd-Ofelt theory was applied to calculate detailed spectroscopic parameters. • Intense green emission 550 nm corresponding to ⁵F₄,⁵S₂→⁵I₈ transition was found. • The stimulated emission cross-section for ⁵F₄,⁵S₂→⁵I₈ transition was estimated. • The fluorescence lifetime and the quantum efficiency was calculated. The polarized absorption, emission spectra of Ho³⁺ doped CaYAlO₄ have been performed at room temperature. Based on the Judd-Ofelt theory, the detailed spectroscopic parameters, radiative transition probabilities, radiative lifetimes and branching ratios were obtained. It is found that the luminescence spectra excited by 454 nm pumping are dominated by an intense green emission 550 nm in the visible wavelength region which associates with the transition ⁵F₄,⁵S₂→⁵I₈. The stimulated emission cross-section for this transition was estimated. The fluorescence decay curve was also measured and the quantum efficiency was calculated.