Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films

Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

Research output: Contribution to journalArticle

156 Citations (Scopus)

Abstract

Organic amorphous films fabricated by vacuum deposition have been widely used in organic light-emitting devices, making use of their high-performance optical and electrical characteristics and taking advantage of the easy fabrication of pinhole-free thin smooth layers of a desired thickness. However, random orientation in amorphous films often makes it difficult to utilize their best optical and electrical potential. Here the authors demonstrate that the linear-shaped molecules of fluorescent styrylbenzene derivatives are horizontally oriented in organic amorphous films fabricated by conventional vacuum deposition even when the molecules are doped in an isotropic host matrix film. The longer the molecular length is, the larger the anisotropy of the molecular orientation becomes. The weak interaction between adjacent molecules and the linear-shaped molecular structure probably cause the horizontal orientation. The fact that the horizontal molecular orientation occurs on any underlying layers shows the high versatility of the horizontal orientation for various applications. Their findings will provide a new guideline for molecular designs that can be used to improve optical and electrical characteristics of organic optoelectronic devices, such as organic light-emitting diodes and organic laser devices.

Original languageEnglish
Pages (from-to)127-137
Number of pages11
JournalOrganic Electronics
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 1 2009

Fingerprint

horizontal orientation
Amorphous films
Vacuum deposition
Molecular orientation
Vacuum
vacuum
Molecules
vacuum deposition
Organic lasers
molecules
Organic light emitting diodes (OLED)
organic lasers
Crystal orientation
Optoelectronic devices
Molecular structure
Semiconductor lasers
Anisotropy
pinholes
versatility
optoelectronic devices

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films. / Yokoyama, Daisuke; Sakaguchi, Akio; Suzuki, Michio; Adachi, Chihaya.

In: Organic Electronics, Vol. 10, No. 1, 01.01.2009, p. 127-137.

Research output: Contribution to journalArticle

@article{512cf706d7ed402cbbc541585cbd082a,
title = "Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films",
abstract = "Organic amorphous films fabricated by vacuum deposition have been widely used in organic light-emitting devices, making use of their high-performance optical and electrical characteristics and taking advantage of the easy fabrication of pinhole-free thin smooth layers of a desired thickness. However, random orientation in amorphous films often makes it difficult to utilize their best optical and electrical potential. Here the authors demonstrate that the linear-shaped molecules of fluorescent styrylbenzene derivatives are horizontally oriented in organic amorphous films fabricated by conventional vacuum deposition even when the molecules are doped in an isotropic host matrix film. The longer the molecular length is, the larger the anisotropy of the molecular orientation becomes. The weak interaction between adjacent molecules and the linear-shaped molecular structure probably cause the horizontal orientation. The fact that the horizontal molecular orientation occurs on any underlying layers shows the high versatility of the horizontal orientation for various applications. Their findings will provide a new guideline for molecular designs that can be used to improve optical and electrical characteristics of organic optoelectronic devices, such as organic light-emitting diodes and organic laser devices.",
author = "Daisuke Yokoyama and Akio Sakaguchi and Michio Suzuki and Chihaya Adachi",
year = "2009",
month = "1",
day = "1",
doi = "10.1016/j.orgel.2008.10.010",
language = "English",
volume = "10",
pages = "127--137",
journal = "Organic Electronics: physics, materials, applications",
issn = "1566-1199",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films

AU - Yokoyama, Daisuke

AU - Sakaguchi, Akio

AU - Suzuki, Michio

AU - Adachi, Chihaya

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Organic amorphous films fabricated by vacuum deposition have been widely used in organic light-emitting devices, making use of their high-performance optical and electrical characteristics and taking advantage of the easy fabrication of pinhole-free thin smooth layers of a desired thickness. However, random orientation in amorphous films often makes it difficult to utilize their best optical and electrical potential. Here the authors demonstrate that the linear-shaped molecules of fluorescent styrylbenzene derivatives are horizontally oriented in organic amorphous films fabricated by conventional vacuum deposition even when the molecules are doped in an isotropic host matrix film. The longer the molecular length is, the larger the anisotropy of the molecular orientation becomes. The weak interaction between adjacent molecules and the linear-shaped molecular structure probably cause the horizontal orientation. The fact that the horizontal molecular orientation occurs on any underlying layers shows the high versatility of the horizontal orientation for various applications. Their findings will provide a new guideline for molecular designs that can be used to improve optical and electrical characteristics of organic optoelectronic devices, such as organic light-emitting diodes and organic laser devices.

AB - Organic amorphous films fabricated by vacuum deposition have been widely used in organic light-emitting devices, making use of their high-performance optical and electrical characteristics and taking advantage of the easy fabrication of pinhole-free thin smooth layers of a desired thickness. However, random orientation in amorphous films often makes it difficult to utilize their best optical and electrical potential. Here the authors demonstrate that the linear-shaped molecules of fluorescent styrylbenzene derivatives are horizontally oriented in organic amorphous films fabricated by conventional vacuum deposition even when the molecules are doped in an isotropic host matrix film. The longer the molecular length is, the larger the anisotropy of the molecular orientation becomes. The weak interaction between adjacent molecules and the linear-shaped molecular structure probably cause the horizontal orientation. The fact that the horizontal molecular orientation occurs on any underlying layers shows the high versatility of the horizontal orientation for various applications. Their findings will provide a new guideline for molecular designs that can be used to improve optical and electrical characteristics of organic optoelectronic devices, such as organic light-emitting diodes and organic laser devices.

UR - http://www.scopus.com/inward/record.url?scp=58049182462&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58049182462&partnerID=8YFLogxK

U2 - 10.1016/j.orgel.2008.10.010

DO - 10.1016/j.orgel.2008.10.010

M3 - Article

AN - SCOPUS:58049182462

VL - 10

SP - 127

EP - 137

JO - Organic Electronics: physics, materials, applications

JF - Organic Electronics: physics, materials, applications

SN - 1566-1199

IS - 1

ER -