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    "headline": "The Emitter Controls Its Own Crystal Phase",
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    "dek": "An X-type quasi-2D perovskite reached 21.9 percent external quantum efficiency in a vacuum-deposited LED.",
    "summary": "An X-type quasi-2D perovskite reached 21.9 percent external quantum efficiency in a vacuum-deposited LED.",
    "body_text": "Seoul National University and Cambridge researchers designed spacer molecules and a lithium-fluoride hetero-scaffold that steer perovskite crystallization during vacuum deposition. The resulting films exceeded 85 percent photoluminescence quantum yield, while devices reached 21.9 percent external quantum efficiency with a 16.8-nanometer emission linewidth. The team also fabricated large-area, flexible, and patterned samples. These are laboratory device metrics, not manufacturing yield, lifetime, or a commercial display.",
    "why_it_matters": "An X-type quasi-2D perovskite reached 21.9 percent external quantum efficiency in a vacuum-deposited LED.",
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    "tags": [
      "perovskite LEDs",
      "displays",
      "vacuum deposition"
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    {
      "source_id": "source-2026-07-19-015",
      "title": "Seoul National University via EurekAlert: X-type vapor-deposited PeLED",
      "publisher": "Seoul National University via EurekAlert",
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    "title": "The Emitter Controls Its Own Crystal Phase",
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    "published_at": "2026-07-19T09:00:00.000-04:00",
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