J. Rare Earths., 2021, 39(4), 386-389https://www.sciencedirect.com/science/article/abs/pii/S1002072120300053

As a promising narrow-band phosphor, SrLiAl₃N₄ has a seemingly ultra-small total crystal-field splitting of only 2400 cm⁻¹ with Ce³⁺ as dopant ions. This paper is devoted to unravel this anomalous phenomenon based on semi-quantitative crystal-field calculations. The results show that there may exist undetected excitation peaks immersed in the host excitation band, and the calibrated crystal-field splitting is 27000 cm⁻¹, comparable to those of other Ce³⁺ doped phosphors. In the end the effect of polyhedral deformation on energy level is briefly discussed.