Data-Driven Discovery of Full-Visible-Spectrum Phosphor

The
development of extra-broadband phosphors is essential for next-generation
illumination with better color experience. In this work, we report
the discovery of the first-known Eu2+-activated full-visible-spectrum
phosphor, Sr2AlSi2O6N:Eu2+, identified by combining data mining of high-throughput density
functional theory calculations and experimental characterization.
Excited by UV-light-emitting diodes (LEDs), Sr2AlSi2O6N:Eu2+ shows a superbroad emission
with a bandwidth of 230 nm, the broadest emission bandwidth ever reported,
and has excellent thermal quenching resistance (88% intensity at 150
°C). A prototype white LED utilizing only this full-visible-spectrum
phosphor exhibits superior color quality (Ra = 97, R9 = 91), outperforming commercial
tricolor phosphor-converted LEDs. These findings not only show great
promise of Sr2AlSi2O6N:Eu2+ as a single white emitter but also open up in silico design of full-visible-spectra
phosphor in a single-phase material to address the reabsorption energy
loss in commercial tricolor phosphor mixture.