Horizontal molecular orientation in solution-processed organic light-emitting diodes

L. Zhao, T. Komino, M. Inoue, J. H. Kim, J. C. Ribierre, C. Adachi

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Horizontal 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%.

Original languageEnglish
Article number063301
JournalApplied Physics Letters
Volume106
Issue number6
DOIs
Publication statusPublished - Feb 9 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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