Excitation-Dependent Tunable White Light of ns 2 Ions Doped Rb 2 SnCl 6 Vacancy Ordered Double Perovskite.

Single-matrix white light-emitting diodes are still a challenge. Achieving tunable white light emission from lead-free perovskites attracts much attention. Herein, nanoscale Rb 2 SnCl 6 (RSC) vacancy ordered double perovskite were synthesized by an optimized precipitation method. Further, using ns 2 ions (Bi 3+ , Te 4+ , and Sb 3+ ) doped RSC vacancy ordered double perovskite to obtain broadband blue, yellow-green, and orange-red emission. The color temperature adjustable high-quality white light emission based on the codoping strategy is obtained by controlling the doping ratio of Bi 3+ and Te 4+ . Additionally, the white light-emitting diodes encapsulated by this single matrix white luminescent material exhibit excellent stability. Combined with theoretical calculations, it is elucidated that these high-efficiency emissions are not only derived from the unique electronic transition of ns 2 ions but also related to the energy band properties and the crystal field. This work shows that ns 2 ions doped RSC vacancy ordered double perovskite can meet the needs of different luminous colors and color temperature tunable white light emission. Meanwhile, it is a strong competitor to replace the lead-based perovskite.