High Efficiency Fluorescence OLED by Utilizing a TADF Process

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  • Nakanotani Hajime
    Center for Organic Photonics and Electronics Research (OPERA) JST, ERATO, Adachi Molecular Exciton Engineering Project
  • Adachi Chihaya
    Center for Organic Photonics and Electronics Research (OPERA) JST, ERATO, Adachi Molecular Exciton Engineering Project

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Other Title
  • 熱活性化遅延蛍光過程を利用した高性能蛍光有機EL素子
  • ネツ カッセイカ チエン ケイコウ カテイ オ リヨウ シタ コウセイノウ ケイコウ ユウキ EL ソシ

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<p>We report fluorescence-based organic light-emitting diodes (OLEDs) that realize external EL quantum efficiencies approaching to nearly 20% for blue, green, yellow and red emissions, indicating that the singlet exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence (TADF) molecules as energy donor that permit efficient transfer of all electrically generated singlet and triplet excitons from the energy donor to the conventional fluorescent emitters, i.e., energy acceptor. We revealed that the OLEDs employing this exciton harvesting process also provide significant enhancement of operational stability.</p>

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