Multi-color microfluidic organic light-emitting diodes based on on-demand emitting layers of pyrene-based liquid organic semiconductors with fluorescent guest dopants

Takashi Kasahara, Shigeyuki Matsunami, Tomohiko Edura, Ryoichi Ishimatsu, Juro Oshima, Miho Tsuwaki, Toshihiko Imato, Shuichi Shoji, Chihaya Adachi, Jun Mizuno

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In this study, we propose on-demand multi-color microfluidic organic light-emitting diodes (microfluidic OLEDs) using fluorescent guest emitter-doped liquid organic semiconductors. We use 1-pyrenebutyric acid 2-ethylhexyl ester (PLQ) not only for a greenish-blue liquid emitter, but also for a liquid host. 5,12-Diphenyltetracene (DPT), 5,6,11,12-tetraphenyltetracene (rubrene), and tetraphenyldibenzoperiflanthene (DBP) are doped into PLQ to obtain green, yellow, and red liquid emitters, respectively. Single-micrometer-thick SU-8-based microchannels sandwiched between an indium tin oxide (ITO) anode and a 3-aminopropyltriethoxysilane (APTES)-modified ITO cathode are fabricated on a glass substrate using photolithography and heterogeneous bonding techniques, and emitting layers are formed on-demand by simply injecting liquid emitters into the target microchannels. The microfluidic OLEDs with liquid emitters successfully exhibited multi-color electroluminescence (EL) emissions. Furthermore, the maximum luminance reached 26.0 cd/m2 at 61 V for 2.5-μm-thick microfluidic OLED with PLQ, and the decreased EL luminance was recovered by replacing the degraded emitting layer with a fresh liquid emitter. We expect that on-demand multi-color EL emissions and refreshable luminance features of the proposed microfluidic OLEDs will be highly promising technologies for future long-life light-emitting device applications.

Original languageEnglish
Pages (from-to)481-489
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume207
Issue numberPA
DOIs
Publication statusPublished - 2015

Fingerprint

Semiconducting organic compounds
Pyrene
Organic light emitting diodes (OLED)
organic semiconductors
pyrenes
Microfluidics
light emitting diodes
Doping (additives)
emitters
Color
color
Liquids
liquids
Electroluminescence
luminance
electroluminescence
Luminance
microchannels
Microchannels
Tin oxides

Keywords

  • Electro-microfluidic
  • Energy transfer
  • Liquid host
  • Liquid OLEDs
  • Liquid organic semiconductor
  • Microfluidic OLEDs

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Instrumentation

Cite this

Multi-color microfluidic organic light-emitting diodes based on on-demand emitting layers of pyrene-based liquid organic semiconductors with fluorescent guest dopants. / Kasahara, Takashi; Matsunami, Shigeyuki; Edura, Tomohiko; Ishimatsu, Ryoichi; Oshima, Juro; Tsuwaki, Miho; Imato, Toshihiko; Shoji, Shuichi; Adachi, Chihaya; Mizuno, Jun.

In: Sensors and Actuators, B: Chemical, Vol. 207, No. PA, 2015, p. 481-489.

Research output: Contribution to journalArticle

Kasahara, Takashi ; Matsunami, Shigeyuki ; Edura, Tomohiko ; Ishimatsu, Ryoichi ; Oshima, Juro ; Tsuwaki, Miho ; Imato, Toshihiko ; Shoji, Shuichi ; Adachi, Chihaya ; Mizuno, Jun. / Multi-color microfluidic organic light-emitting diodes based on on-demand emitting layers of pyrene-based liquid organic semiconductors with fluorescent guest dopants. In: Sensors and Actuators, B: Chemical. 2015 ; Vol. 207, No. PA. pp. 481-489.
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AU - Kasahara, Takashi

AU - Matsunami, Shigeyuki

AU - Edura, Tomohiko

AU - Ishimatsu, Ryoichi

AU - Oshima, Juro

AU - Tsuwaki, Miho

AU - Imato, Toshihiko

AU - Shoji, Shuichi

AU - Adachi, Chihaya

AU - Mizuno, Jun

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AB - In this study, we propose on-demand multi-color microfluidic organic light-emitting diodes (microfluidic OLEDs) using fluorescent guest emitter-doped liquid organic semiconductors. We use 1-pyrenebutyric acid 2-ethylhexyl ester (PLQ) not only for a greenish-blue liquid emitter, but also for a liquid host. 5,12-Diphenyltetracene (DPT), 5,6,11,12-tetraphenyltetracene (rubrene), and tetraphenyldibenzoperiflanthene (DBP) are doped into PLQ to obtain green, yellow, and red liquid emitters, respectively. Single-micrometer-thick SU-8-based microchannels sandwiched between an indium tin oxide (ITO) anode and a 3-aminopropyltriethoxysilane (APTES)-modified ITO cathode are fabricated on a glass substrate using photolithography and heterogeneous bonding techniques, and emitting layers are formed on-demand by simply injecting liquid emitters into the target microchannels. The microfluidic OLEDs with liquid emitters successfully exhibited multi-color electroluminescence (EL) emissions. Furthermore, the maximum luminance reached 26.0 cd/m2 at 61 V for 2.5-μm-thick microfluidic OLED with PLQ, and the decreased EL luminance was recovered by replacing the degraded emitting layer with a fresh liquid emitter. We expect that on-demand multi-color EL emissions and refreshable luminance features of the proposed microfluidic OLEDs will be highly promising technologies for future long-life light-emitting device applications.

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