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    "headline": "The OLED Learned to Grow a Crystal",
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    "dek": "A two-step annealing process put large crystalline rubrene domains into an OLED and sharply increased current density.",
    "summary": "A two-step annealing process put large crystalline rubrene domains into an OLED and sharply increased current density.",
    "body_text": "University of Toyama researchers deposited a 50-nanometer rubrene layer, seeded crystals with one heating step and grew them after the remaining layers were added. The resulting non-epitaxial crystalline OLEDs showed current densities up to 1,000 times those of amorphous-rubrene controls, a 1.33-volt turn-on and a narrower emission peak. The Synthetic Metals study is a device demonstration under laboratory conditions; it does not yet establish commercial efficiency, lifetime or scalable display manufacturing.",
    "why_it_matters": "A two-step annealing process put large crystalline rubrene domains into an OLED and sharply increased current density.",
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      "The Synthetic Metals study is a device demonstration under laboratory conditions; it does not yet establish commercial efficiency, lifetime or scalable display manufacturing."
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    "tags": [
      "OLED",
      "rubrene",
      "organic semiconductor",
      "crystalline film"
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      "source_id": "source-2026-07-28-006",
      "title": "University of Toyama via EurekAlert: Crystalline rubrene OLED",
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