TY - JOUR
T1 - Multi-color microfluidic organic light-emitting diodes based on on-demand emitting layers of pyrene-based liquid organic semiconductors with fluorescent guest dopants
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
N1 - Funding Information:
This work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and the International Institute for Carbon Neutral Energy Research ( WPI-I2CNER ) sponsored by the Japan Ministry of Education, Culture, Sports Science & Technology (MEXT) and Grant-in-Aid for Scientific Basic Research (S) No. 23226010 and for Scientific Basic Research (B) No. 25289241 . The authors thank for MEXT Nanotechnology Platform Support Project of Waseda University. We gratefully acknowledge Kohei Tsugita (Kyushu University) for valuable discussion.
Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
PY - 2015/2
Y1 - 2015/2
N2 - 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.
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.
KW - Electro-microfluidic
KW - Energy transfer
KW - Liquid OLEDs
KW - Liquid host
KW - Liquid organic semiconductor
KW - Microfluidic OLEDs
UR - http://www.scopus.com/inward/record.url?scp=84910092242&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84910092242&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2014.09.101
DO - 10.1016/j.snb.2014.09.101
M3 - Article
AN - SCOPUS:84910092242
SN - 0925-4005
VL - 207
SP - 481
EP - 489
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
IS - Part A
ER -