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Microfluidic White Organic Light-Emitting Diode Based on Integrated Patterns of Greenish-Blue and Yellow Solvent-Free Liquid Emitters.

Kobayashi N, Kasahara T, Edura T, Oshima J, Ishimatsu R, Tsuwaki M, Imato T, Shoji S, Mizuno J - Sci Rep (2015)

Bottom Line: The fabricated electro-microfluidic device successfully exhibited white electroluminescence (EL) emission via simultaneous greenish-blue and yellow emissions under an applied voltage of 100 V.A white emission with Commission Internationale de l'Declairage (CIE) color coordinates of (0.40, 0.42) was also obtained; the emission corresponds to warm-white light.The proposed device has potential applications in subpixels of liquid-based microdisplays and for lighting.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.

ABSTRACT
We demonstrated a novel microfluidic white organic light-emitting diode (microfluidic WOLED) based on integrated sub-100-μm-wide microchannels. Single-μm-thick SU-8-based microchannels, which were sandwiched between indium tin oxide (ITO) anode and cathode pairs, were fabricated by photolithography and heterogeneous bonding technologies. 1-Pyrenebutyric acid 2-ethylhexyl ester (PLQ) was used as a solvent-free greenish-blue liquid emitter, while 2,8-di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb)-doped PLQ was applied as a yellow liquid emitter. In order to form the liquid white light-emitting layer, the greenish-blue and yellow liquid emitters were alternately injected into the integrated microchannels. The fabricated electro-microfluidic device successfully exhibited white electroluminescence (EL) emission via simultaneous greenish-blue and yellow emissions under an applied voltage of 100 V. A white emission with Commission Internationale de l'Declairage (CIE) color coordinates of (0.40, 0.42) was also obtained; the emission corresponds to warm-white light. The proposed device has potential applications in subpixels of liquid-based microdisplays and for lighting.

No MeSH data available.


(a) Molecular structure of the employed materials. PLQ was used as the greenish-blue emitter and the host material. TBRb was used as the yellow fluorescent guest emitters. (b) Design of the microfluidic WOLED. Twelve SU-8 microchannels were sandwiched between the anode substrate and the cathode substrate. (c) Fabrication process of the microfluidic WOLED. Anode and cathode electrodes were patterned; subsequently, microchannels were fabricated by photolithography. Finally, two substrates were bonded with APTES- and GOPTS-SAMs.
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f2: (a) Molecular structure of the employed materials. PLQ was used as the greenish-blue emitter and the host material. TBRb was used as the yellow fluorescent guest emitters. (b) Design of the microfluidic WOLED. Twelve SU-8 microchannels were sandwiched between the anode substrate and the cathode substrate. (c) Fabrication process of the microfluidic WOLED. Anode and cathode electrodes were patterned; subsequently, microchannels were fabricated by photolithography. Finally, two substrates were bonded with APTES- and GOPTS-SAMs.

Mentions: Molecular structures of the employed materials are shown in Fig. 2(a). PLQ (Nissan Chemical Industries, Ltd.) was used as both the greenish-blue liquid emitter14 and the liquid host15. 2,8-Di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb) (Luminescence Technology Co.) was used as a yellow fluorescent guest dopant171819, and first doped into the host PLQ in accordance with the color tuning method reported in our previous works15. TBRb is promising as a highly efficient yellow fluorescent dopant because of its attractive properties such as bipolar characteristics171819. TBRb was dissolved into CH2Cl2 and subsequently mixed with PLQ in a beaker. Finally, CH2Cl2 was evaporated by heating on a hotplate at 80°C in a vacuum chamber. In this study, we prepared 2wt% TBRb-doped PLQ. 0.25wt% tributylmethylphosphonium bis (trifluoromethanesulfonyl) imide (TMP-TFSI) (Tokyo Chemical Industry Co., Ltd.) was applied as the electrolyte and doped into the liquid emitters to enhance carrier injection141516.


Microfluidic White Organic Light-Emitting Diode Based on Integrated Patterns of Greenish-Blue and Yellow Solvent-Free Liquid Emitters.

Kobayashi N, Kasahara T, Edura T, Oshima J, Ishimatsu R, Tsuwaki M, Imato T, Shoji S, Mizuno J - Sci Rep (2015)

(a) Molecular structure of the employed materials. PLQ was used as the greenish-blue emitter and the host material. TBRb was used as the yellow fluorescent guest emitters. (b) Design of the microfluidic WOLED. Twelve SU-8 microchannels were sandwiched between the anode substrate and the cathode substrate. (c) Fabrication process of the microfluidic WOLED. Anode and cathode electrodes were patterned; subsequently, microchannels were fabricated by photolithography. Finally, two substrates were bonded with APTES- and GOPTS-SAMs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4594091&req=5

f2: (a) Molecular structure of the employed materials. PLQ was used as the greenish-blue emitter and the host material. TBRb was used as the yellow fluorescent guest emitters. (b) Design of the microfluidic WOLED. Twelve SU-8 microchannels were sandwiched between the anode substrate and the cathode substrate. (c) Fabrication process of the microfluidic WOLED. Anode and cathode electrodes were patterned; subsequently, microchannels were fabricated by photolithography. Finally, two substrates were bonded with APTES- and GOPTS-SAMs.
Mentions: Molecular structures of the employed materials are shown in Fig. 2(a). PLQ (Nissan Chemical Industries, Ltd.) was used as both the greenish-blue liquid emitter14 and the liquid host15. 2,8-Di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb) (Luminescence Technology Co.) was used as a yellow fluorescent guest dopant171819, and first doped into the host PLQ in accordance with the color tuning method reported in our previous works15. TBRb is promising as a highly efficient yellow fluorescent dopant because of its attractive properties such as bipolar characteristics171819. TBRb was dissolved into CH2Cl2 and subsequently mixed with PLQ in a beaker. Finally, CH2Cl2 was evaporated by heating on a hotplate at 80°C in a vacuum chamber. In this study, we prepared 2wt% TBRb-doped PLQ. 0.25wt% tributylmethylphosphonium bis (trifluoromethanesulfonyl) imide (TMP-TFSI) (Tokyo Chemical Industry Co., Ltd.) was applied as the electrolyte and doped into the liquid emitters to enhance carrier injection141516.

Bottom Line: The fabricated electro-microfluidic device successfully exhibited white electroluminescence (EL) emission via simultaneous greenish-blue and yellow emissions under an applied voltage of 100 V.A white emission with Commission Internationale de l'Declairage (CIE) color coordinates of (0.40, 0.42) was also obtained; the emission corresponds to warm-white light.The proposed device has potential applications in subpixels of liquid-based microdisplays and for lighting.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.

ABSTRACT
We demonstrated a novel microfluidic white organic light-emitting diode (microfluidic WOLED) based on integrated sub-100-μm-wide microchannels. Single-μm-thick SU-8-based microchannels, which were sandwiched between indium tin oxide (ITO) anode and cathode pairs, were fabricated by photolithography and heterogeneous bonding technologies. 1-Pyrenebutyric acid 2-ethylhexyl ester (PLQ) was used as a solvent-free greenish-blue liquid emitter, while 2,8-di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb)-doped PLQ was applied as a yellow liquid emitter. In order to form the liquid white light-emitting layer, the greenish-blue and yellow liquid emitters were alternately injected into the integrated microchannels. The fabricated electro-microfluidic device successfully exhibited white electroluminescence (EL) emission via simultaneous greenish-blue and yellow emissions under an applied voltage of 100 V. A white emission with Commission Internationale de l'Declairage (CIE) color coordinates of (0.40, 0.42) was also obtained; the emission corresponds to warm-white light. The proposed device has potential applications in subpixels of liquid-based microdisplays and for lighting.

No MeSH data available.