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      Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off

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      Author
      Liu, S. W.
      Sun, X. W.
      Demir, Hilmi Volkan
      Date
      2012
      Source Title
      AIP Advances
      Print ISSN
      2158-3226
      Electronic ISSN
      2158-3226
      Publisher
      A I P Publishing LLC
      Volume
      2
      Issue
      1
      Pages
      012192-1 - 012192-7
      Language
      English
      Type
      Article
      Item Usage Stats
      188
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      158
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      Abstract
      We demonstrated graded-host phosphorescent organic light-emitting diodes with high efficiency and reduced efficiency roll-off. The emissive layer of the graded host device consists of both electron and hole transport type hosts, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI) and 4,4-,4- tris(Ncarbazolyl) triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which wasuniformly doped into the graded hostmatrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency rolloff as compared to the unipolar-host and double layer heterojunction host devices.
      Keywords
      Acetylacetonates
      Double layers
      Emissive layers
      Graded composition
      Hole transports
      Host devices
      Phosphorescent organic light-emitting diodes
      Power efficiency
      Red emitter
      Triphenyl amines
      Benzene
      Heterojunctions
      Iridium compounds
      Light emission
      Light emitting diodes
      Phosphorescence
      Efficiency
      Permalink
      http://hdl.handle.net/11693/21221
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.3701685
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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