Mining Unexplored Chemistries for Phosphors for High-Color-Quality White-Light-Emitting Diodes
- Journal
- Joule
- Status
- published
- Vol
- 2
- Page
- 1-13
- Year
- 2018
- Link
- https://doi.org/10.1016/j.joule.2018.01.015 634회 연결
There is a critical need for new earth-abundant phosphors to enable next-generation, highly efficient solid-state lighting. Here we report the discovery of Sr2LiAlO4, the first known Sr-Li-Al-O quaternary crystal, via a carefully targeted data-driven structure prediction and screening effort using density functional theory calculations. Sr2LiAlO4 is predicted and experimentally confirmed to be a thermodynamically and thermally stable phosphor host that can be excited with near-UV/blue sources. The Eu2+- and Ce3+-activated Sr2LiAlO4 phosphors exhibit broad emissions at lmax 512 nm (green-yellow) and lmax 434 nm (blue), respectively, with excellent thermal quenching resistance of >88% intensity at 150C. A prototype phosphor-converted white LED utilizing Sr2LiAlO4-based phosphors yields an excellent color-rendering index exceeding 90. Sr2LiAlO4 therefore exhibits great potential for industrial applications in low-cost, high-color-quality WLED