In-Plane Anisotropic Molecular Orientation of Pentafluorene and Its Application to Linearly Polarized Electroluminescence

Takeshi Komino, Hiroyuki Kuwae, Akiko Okada, Weixin Fu, Jun Mizuno, Jean Charles Maurice Ribierre, Yuji Oki, Chihaya Adachi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

By preparing parallelly aligned 1.9-μm-high SiO2 microfluidic channels on an indium tin oxide substrate surface, the solution flow direction during spin-coating was controlled to be parallel to the grating. Using this technique, a pentafluorene-4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) binary solution in chloroform was spin-coated to embed a 40-50 nm-thick 10 wt %-pentafluorene:CBP thin film in the channels. In-plane polarized photoluminescence measurements revealed that the pentafluorene molecules tended to orient along the grating, demonstrating that one-dimensional fluid flow can control the in-plane molecular orientation. Furthermore, the dependences of the photoluminescence anisotropy on the spin speed and substrate material suggest that the velocity of the solution flow and/or its gradient in the vertical direction greatly affects the resulting orientation. This indicates that the mechanism behind the molecular orientation is related to stress such as the shear force. The effect of the solution flow on the molecular orientation was demonstrated even in organic light-emitting diodes (OLEDs). Linearly polarized electroluminescence was obtained by applying the in-plane orientation to OLEDs, and it was found that the dichroic ratio of the electroluminescence orthogonal (x) and parallel (y) to the grating is x/y = 0.75.

Original languageEnglish
Pages (from-to)27054-27061
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number32
DOIs
Publication statusPublished - Aug 16 2017

Fingerprint

Molecular orientation
Electroluminescence
Organic light emitting diodes (OLED)
Photoluminescence
Spin coating
Substrates
Chloroform
Chlorine compounds
Tin oxides
Flow control
Microfluidics
Crystal orientation
Indium
Flow of fluids
Anisotropy
Thin films
Molecules
diphenyl
Direction compound

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

In-Plane Anisotropic Molecular Orientation of Pentafluorene and Its Application to Linearly Polarized Electroluminescence. / Komino, Takeshi; Kuwae, Hiroyuki; Okada, Akiko; Fu, Weixin; Mizuno, Jun; Ribierre, Jean Charles Maurice; Oki, Yuji; Adachi, Chihaya.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 32, 16.08.2017, p. 27054-27061.

Research output: Contribution to journalArticle

Komino, Takeshi ; Kuwae, Hiroyuki ; Okada, Akiko ; Fu, Weixin ; Mizuno, Jun ; Ribierre, Jean Charles Maurice ; Oki, Yuji ; Adachi, Chihaya. / In-Plane Anisotropic Molecular Orientation of Pentafluorene and Its Application to Linearly Polarized Electroluminescence. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 32. pp. 27054-27061.
@article{c7f4438a754349188a4ad30389ff408f,
title = "In-Plane Anisotropic Molecular Orientation of Pentafluorene and Its Application to Linearly Polarized Electroluminescence",
abstract = "By preparing parallelly aligned 1.9-μm-high SiO2 microfluidic channels on an indium tin oxide substrate surface, the solution flow direction during spin-coating was controlled to be parallel to the grating. Using this technique, a pentafluorene-4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) binary solution in chloroform was spin-coated to embed a 40-50 nm-thick 10 wt {\%}-pentafluorene:CBP thin film in the channels. In-plane polarized photoluminescence measurements revealed that the pentafluorene molecules tended to orient along the grating, demonstrating that one-dimensional fluid flow can control the in-plane molecular orientation. Furthermore, the dependences of the photoluminescence anisotropy on the spin speed and substrate material suggest that the velocity of the solution flow and/or its gradient in the vertical direction greatly affects the resulting orientation. This indicates that the mechanism behind the molecular orientation is related to stress such as the shear force. The effect of the solution flow on the molecular orientation was demonstrated even in organic light-emitting diodes (OLEDs). Linearly polarized electroluminescence was obtained by applying the in-plane orientation to OLEDs, and it was found that the dichroic ratio of the electroluminescence orthogonal (x) and parallel (y) to the grating is x/y = 0.75.",
author = "Takeshi Komino and Hiroyuki Kuwae and Akiko Okada and Weixin Fu and Jun Mizuno and Ribierre, {Jean Charles Maurice} and Yuji Oki and Chihaya Adachi",
year = "2017",
month = "8",
day = "16",
doi = "10.1021/acsami.7b05570",
language = "English",
volume = "9",
pages = "27054--27061",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "32",

}

TY - JOUR

T1 - In-Plane Anisotropic Molecular Orientation of Pentafluorene and Its Application to Linearly Polarized Electroluminescence

AU - Komino, Takeshi

AU - Kuwae, Hiroyuki

AU - Okada, Akiko

AU - Fu, Weixin

AU - Mizuno, Jun

AU - Ribierre, Jean Charles Maurice

AU - Oki, Yuji

AU - Adachi, Chihaya

PY - 2017/8/16

Y1 - 2017/8/16

N2 - By preparing parallelly aligned 1.9-μm-high SiO2 microfluidic channels on an indium tin oxide substrate surface, the solution flow direction during spin-coating was controlled to be parallel to the grating. Using this technique, a pentafluorene-4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) binary solution in chloroform was spin-coated to embed a 40-50 nm-thick 10 wt %-pentafluorene:CBP thin film in the channels. In-plane polarized photoluminescence measurements revealed that the pentafluorene molecules tended to orient along the grating, demonstrating that one-dimensional fluid flow can control the in-plane molecular orientation. Furthermore, the dependences of the photoluminescence anisotropy on the spin speed and substrate material suggest that the velocity of the solution flow and/or its gradient in the vertical direction greatly affects the resulting orientation. This indicates that the mechanism behind the molecular orientation is related to stress such as the shear force. The effect of the solution flow on the molecular orientation was demonstrated even in organic light-emitting diodes (OLEDs). Linearly polarized electroluminescence was obtained by applying the in-plane orientation to OLEDs, and it was found that the dichroic ratio of the electroluminescence orthogonal (x) and parallel (y) to the grating is x/y = 0.75.

AB - By preparing parallelly aligned 1.9-μm-high SiO2 microfluidic channels on an indium tin oxide substrate surface, the solution flow direction during spin-coating was controlled to be parallel to the grating. Using this technique, a pentafluorene-4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) binary solution in chloroform was spin-coated to embed a 40-50 nm-thick 10 wt %-pentafluorene:CBP thin film in the channels. In-plane polarized photoluminescence measurements revealed that the pentafluorene molecules tended to orient along the grating, demonstrating that one-dimensional fluid flow can control the in-plane molecular orientation. Furthermore, the dependences of the photoluminescence anisotropy on the spin speed and substrate material suggest that the velocity of the solution flow and/or its gradient in the vertical direction greatly affects the resulting orientation. This indicates that the mechanism behind the molecular orientation is related to stress such as the shear force. The effect of the solution flow on the molecular orientation was demonstrated even in organic light-emitting diodes (OLEDs). Linearly polarized electroluminescence was obtained by applying the in-plane orientation to OLEDs, and it was found that the dichroic ratio of the electroluminescence orthogonal (x) and parallel (y) to the grating is x/y = 0.75.

UR - http://www.scopus.com/inward/record.url?scp=85027410868&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027410868&partnerID=8YFLogxK

U2 - 10.1021/acsami.7b05570

DO - 10.1021/acsami.7b05570

M3 - Article

AN - SCOPUS:85027410868

VL - 9

SP - 27054

EP - 27061

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

SN - 1944-8244

IS - 32

ER -