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

doi:10.1021/jp301650x

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

Applied Chemistry

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	8699-8706
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	15
DOIs	https://doi.org/10.1021/jp301650x
Publication status	Published - Apr 19 2012

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp301650x

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

abstract = "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.",

author = "Kim, {Jun Y.} and Daisuke Yokoyama and Chihaya Adachi",

year = "2012",

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doi = "10.1021/jp301650x",

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journal = "Journal of Physical Chemistry C",

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T1 - Horizontal orientation of disk-like hole transport molecules and their application for organic light-emitting diodes requiring a lower driving voltage

AU - Kim, Jun Y.

AU - Yokoyama, Daisuke

AU - Adachi, Chihaya

PY - 2012/4/19

Y1 - 2012/4/19

N2 - 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.

AB - 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.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

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

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