Highly efficient single-layer dendrimer light-emitting diodes with balanced charge transport

DOI PDF 6 Citations
  • Thomas D. Anthopoulos
    Organic Semiconductor Center, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
  • Jonathan P. J. Markham
    Organic Semiconductor Center, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
  • Ebinazar B. Namdas
    Organic Semiconductor Center, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
  • Ifor D. W. Samuel
    Organic Semiconductor Center, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
  • Shih-Chun Lo
    The Dyson Perrins Laboratory, Oxford University, South Parks Road, Oxford OX1 3QY, United Kingdom
  • Paul L. Burn
    The Dyson Perrins Laboratory, Oxford University, South Parks Road, Oxford OX1 3QY, United Kingdom

Description

<jats:p>High-efficiency single-layer-solution-processed green light-emitting diodes based on a phosphorescent dendrimer are demonstrated. A peak external quantum efficiency of 10.4% (35 cd/A) was measured for a first generation fac-tris(2-phenylpyridine) iridium cored dendrimer when blended with 4,4′-bis(N-carbazolyl)biphenyl and electron transporting 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene at 8.1 V. A maximum power efficiency of 12.8 lm/W was measured also at 8.1 V and 550 cd/m2. These results indicate that, by simple blending of bipolar and electron-transporting molecules, highly efficient light-emitting diodes can be made employing a very simple device structure.</jats:p>

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