Healthy and High-Quality Single-Source Lighting Based on Double-Doped Tin Halide Engineering

Single-source white light-emitting diodes (WLEDs) with smart regulation of correlated color temperature (CCT) are indispensable for the next generation of WLEDs aimed at healthy and high-quality illumination, where a suitable CCT value is closely related to our emotions and circadian rhythm. Herein, this work constructs a single-component emission layer WLED with high performance for controllable daily lighting through Bi 3+ /Te 4+ dual-doped Cs 2 SnCl 6 engineering. The efficient energy transfers between triple self-trapped exciton states from Bi 3+ /Te 4+ doping allow two tunable broadband emissions that can cover the full-color region, thereby yielding a standout color-rendering index of 94 for the fabricated WLED. The robust stability against heat, ultraviolet light, and environmental oxygen/water induces a long half-lifetime of WLED up to 1104 h. Moreover, the dual-doped strategy endows the emitter with excitation-dependent luminescent characteristics, enabling the single emissive layer device to realize switching control of cold-, positive-, and warm-white light by converting the excitation chip. Meanwhile, continuous regulation of CCT for different application scenarios can be achieved by adjusting the current of different chips. This work constitutes a solid step toward building single-source WLEDs for smart and healthy lighting based on dual-doped lead-free metal halides.