Co-doping of Sb³⁺/Ln³⁺ in the Cs₂NaGdCl₆ perovskite leads to efficient energy transfer and single-host white light emission

Single-host white light-emitting diodes with good stability and simple fabrication methods have attracted extensive attention from researchers. In this study, Cs₂NaGdCl₆:Sb³⁺ with blue emission is synthesized by introducing Sb³⁺ into Cs₂NaGdCl₆. After doping Tb³⁺ into Cs₂NaGdCl₆:Sb³⁺, the sample achieves a tunable ion emission from blue to green. The energy transfer relationship between Sb³⁺ and Tb³⁺ is explored. White phosphors with CIE coordinates of (0.34, 0.33) are obtained by introducing Ho³⁺ into Cs₂NaGdCl₆:Sb³⁺/Tb³⁺ double perovskites. This work provides a new option for white light emission of halide perovskites doped with Ln³⁺.