Horizontal orientation of disk-like hole transport molecules and their application for organic light-emitting diodes requiring a lower driving voltage

Jun Y. Kim, Daisuke Yokoyama, Chihaya Adachi

研究成果: Contribution to journalArticle査読

40 被引用数 (Scopus)

抄録

Novel starburst type amorphous materials N 1,N 1,N 4,N 1-tetra(biphenyl-4-yl)benzene-1,4-diamine, N 1,N 1,N 1,N 1-tetrakis(4-(thiophen-2- yl)phenyl)benzene-1,4-diamine, and N 1,N 1,N 1,N 1-tetrakis(4-(benzo[b]thiophen-2-yl)phenyl)benzene-1,4- diamine are synthesized and applied as hole injection layers (HILs) in organic light-emitting diodes (OLEDs). OLEDs containing these materials as a HIL demonstrated a significant reduction in the required driving voltage. We found that these molecules form a horizontally oriented amorphous thin film upon vacuum deposition. We observed a close correlation between the reduction of driving voltage in OLEDs and the orientation parameter of the organic thin films. We identified that the enhanced horizontal molecular orientation results in the lower driving voltage because of a decrease in the hole injection barrier at the anode/HIL interface.

本文言語英語
ページ(範囲)8699-8706
ページ数8
ジャーナルJournal of Physical Chemistry C
116
15
DOI
出版ステータス出版済み - 4 19 2012

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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