Regulating the Singlet and Triplet Emission of Sb Ions to Achieve Single-Component White-Light Emitter with Record High Color-Rendering Index and Stability.

The rapid development of solid-state lighting technology has attracted much attention for searching efficient and stable luminescent materials, especially the single-component white-light emitter. Here, we adopt a facile ion-doping technology to synthesize vacancy-ordered double perovskite CsZrCl:Sb. The introduction of Sb ions with a 5s active lone pair into CsZrCl host stimulates the singlet (blue) and triplet (orange) states emission of Sb ions, and their relative emission intensity can be tuned through the energy transfer from singlet to triplet states. Benefiting from the dual-band emission as a pair of perfect complementary colors, the optimum CsZrCl:1.5%Sb exhibits a high-quality white emission with a color-rendering index of 96. By employing CsZrCl:1.5%Sb as the down-conversion phosphor, stable single-component white light-emitting diodes with a record half-lifetime of 2003 h were further fabricated. This study puts forward an effective ion-doping strategy to design single-component white-light emitter, making practical applications of them in lighting technologies a real possibility.