Mining Unexplored Chemistries for Phosphors for High-Color-Quality White-Light-Emitting Diodes
Joule(2018)
摘要
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 λmax ∼ 512 nm (green-yellow) and λmax ∼ 434 nm (blue), respectively, with excellent thermal quenching resistance of >88% intensity at 150°C. 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 WLEDs.
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关键词
white LEDs,high color quality,solid-state lighting,first-principle prediction,experimental validation,Sr2LiAlO4,first known compound in Sr-Li-Al-O chemical space,phosphors
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