Cyan-rich sunlight-like spectra from Mn2+-doped CsCd(Cl1-yBry)3 perovskites with dual tunable emissions and high stability

A ubiquitous cyan gap in the white light emitting diode (WLED) emission spectrum, especially at 490-500 nm, has long hindered our quest for natural sunlight. In this paper, abundant cyan broadband emissions (peak at 496 nm) is first achieved in CsCd(Cl1-yBry)(3) metal halide perovskites (MHPs) via a simple precipitation method to address this challenge. The Mn2+ ions are then doped in CsCd(Cl1-yBry)(3) to supplement the yellow component. The resulting single-component white emitter CsCd1-x (Cl1-yBry)(3):xMn(2+) phosphors possess an ultra-wide band emission from 350 nm to 750 nm, a pair of independent cyan and yellow emission peaks, and tunable color temperature (from 3000 K to 8000 K). The CsCd0.65 (Cl0.9Br0.1)(3) : 0.35Mn(2+) possesses excellent CIE 1931 color coordinates of (0.328, 0.348), a corresponding color temperature of 5690 K and a color rendering index of 90.96. In addition, this composites still has stable luminescence properties after 4 months of immersion in water. These results may stimulate the research on MHP-based single-component white emitter for the next generation of white light illumination.

Automated summary

Abundant cyan broadband emissions are achieved in CsCd(Cl1-yBry)(3) metal halide perovskites (MHPs), addressing the issue of a cyan gap in white light emitting diode (WLED) emission spectrum. Mn2+ ions are doped in CsCd(Cl1-yBry)(3) for yellow supplementation. The resulting single-component white emitter CsCd1-x (Cl1-yBry)(3):xMn(2+) phosphors exhibit a wide band emission, independent cyan and yellow emission peaks, and tunable color temperature.