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Publications

Mining Unexplored Chemistries for Phosphors for High-Color-Quality White-Light-Emitting Diodes
SCI Impact Factor
41.248
Authors
Z. Wang, J. Ha, Y. H. Kim, W. B. Im*, J. McKittrick, and S. P. Ong
Journal
Joule
Status
published
Vol
2
Page
1-13
Year
2018

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


-신문보도 [전자신문], [아시아경제] etc.