Horizontal molecular orientation in solution-processed organic light-emitting diodes
2015; American Institute of Physics; Volume: 106; Issue: 6 Linguagem: Inglês
10.1063/1.4907890
ISSN1520-8842
AutoresLi Zhao, Takeshi Komino, M. Inoue, J. H. Kim, Jean‐Charles Ribierre, Chihaya Adachi,
Tópico(s)Luminescence and Fluorescent Materials
ResumoHorizontal orientation of the emission transition dipole moments achieved in glassy vapor-deposited organic thin films leads to an enhancement of the light out-coupling efficiency in organic light-emitting diodes (OLEDs). Here, our combined study of variable angle spectroscopic ellipsometry and angle dependent photoluminescence demonstrates that such a horizontal orientation can be achieved in glassy spin-coated organic films based on a composite blend of a heptafluorene derivative as a dopant and a 4,4′-bis(N-carbazolyl)-1,1′-biphenyl as a host. Solution-processed fluorescent OLEDs with horizontally oriented heptafluorene emitters were then fabricated and emitted deep blue electroluminescence with an external quantum efficiency as high as 5.3%.
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