Regulating the Singlet and Triplet Emission of Sb<sup>3+</sup> Ions to Achieve Single-Component White-Light Emitter with Record High Color-Rendering Index and Stability.
basic_science · Level V
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- Record sourced from PubMed, PMID 35579571.
- Also identified by DOI 10.1021/acs.nanolett.2c00733.
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Abstract
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 Cs<sub>2</sub>ZrCl<sub>6</sub>:Sb. The introduction of Sb<sup>3+</sup> ions with a 5s<sup>2</sup> active lone pair into Cs<sub>2</sub>ZrCl<sub>6</sub> host stimulates the singlet (blue) and triplet (orange) states emission of Sb<sup>3+</sup> 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 Cs<sub>2</sub>ZrCl<sub>6</sub>:1.5%Sb exhibits a high-quality white emission with a color-rendering index of 96. By employing Cs<sub>2</sub>ZrCl<sub>6</sub>: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.