Microfluidic oled vivek hegde

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<ul><li> 1. T. Kasahara1, J. Mizuno1, S. Hirata2, T. Edura2, S. Matsunami2, C. Adachi2, and S. Shoji1 1WasedaUniversity, Tokyo, JAPAN 2Kyushu University, Fukuoka, JAPANMEMS 2012, Paris, FRANCE, 29 January - 2 February 2012Reporter-Vivek Hegde</li></ul> <p> 2. OLED Technology Motivation Concept and Principle Experimental ProcedureDesign of Prototype micro-fluidic OLEDFabrication ProcessEvaluation of Fabricated micro-fluidic OLED Result and Discussion Conclusion 3. Micro fluidic devices have been developed for awide range of applications. OLEDs containing of solid-state organicsemiconductors. Next generation flat panel display due to theirwide viewing angle, light weight and thincomponents.Recently the optoelectronics devices based onthe liquid emitting materials such as electro-chemiluminescence (ECL) OLEDs are alsoreported. 4. The micro-channel structures are usually fabricated usingMEMS technology. Negative photo-resist SU-8 has been suitable material for themicro channel fabrication .Transparent electrodes such as indium tin oxide (ITO)facilitate the optical microscopic observation of fluidicbehaviour in the micro channels. ITO has been widely used as an anode in OLEDs due to itshigh electrical conductivity. Here Combination of micro-fluidics and liquid OLED. 5. Different fresh liquidorganic semiconductors arecontinuously injected fromthe inlets to the lightemitting areas using thesyringe pumps. 6. Micro-fluidic OLED, which consistsof micro-channels and pairs of ITOanode and cathode.Electroluminescence isperformed in the flowed liquidorganic semiconductors by theradiative recombination ofelectron-hole pairs with DCvoltage. 7. The microchip has a 3 3 matrix ofOLED array in the SU-8 micro-channels. The micro-channels are sandwichedbetween the ITO anodes on a glasssubstrate and the polyethylenenaphthalate (PEN) film with the ITOcathodes. Depth is chosen about 6 m forenhancement of OLED performances,widths are 1000, 1250, and 1500 m. 8. ITO-anode patterned by conventionalphotolithography and wet etching usingdilute aquarigia(a).(HCl-HNO3-H2O) SU-8 3005 6 m thick obtained by spun onsubstrate at 4000 rpm for 20 Sec and softbaked at 95C for 10 min(b). For the surface modification of the SU-8layer, the ITO anodes in the microchannels were covered by sacrificial layerof positive resist of 350 nm(c). 9. The ITO cathodes were fabricated by thesame process as the ITO anodes. The inlet and outlet of the microchannelswere mechanically punched for injecting. The anode and cathode substrates wereseparately fabricated and were bonded toform enclosed ITO electrodes embeddedmicro-fluidic channels. 10. To incorporate oxygenfunctionalities in toSU8,PEN and ITO Finally, the surfaces were bonded under contact pressure of 1.5 MPa at 140C for 5 min to form bondImmersed inGOPTS-Glycidodyloxy proplyl trimethoxysilaneAPTES- Amino propyl triethoxysilaneThe anode substrate was then rinsedwith acetone and IPA to remove thesacrificial resist and any unboundGOPTS-SAM, while the cathodesubstrate was rinsed with ethanol . 11. The inlet and OLED were were Fabricated outlet nozzles investigated connected to the top plate. The liquid emitters introduced manuallymicroscope using scanning acoustic while the (SAM) at 175 MHz used liquid emitters were collected from the outlet nozzles.TheTwo types liquid emitter was detected by: flow of the of tests were performed365the observation of theProper DC voltages nm UV light irradiation. fluidicwere applied to the device with a source meter,ofbehaviour and electroluminescenceand the electroluminescence was recorded with athe liquid emitter in the micro-digital camera. The J-V characteristics weremeasured usingand the currentparameterchannels, a semiconductor density-voltage (J-V) measurement.analyzer 12. SAM image of the fabricated microfluidic OLEDDemonstration Electroluminescence in the microchannels of (b) 1000, (c) 1250 and (d) 1500 m width under applied 70 V. 13. The current density increased with increasing applied voltage The intensity increased significantly larger than 30 VJ-V Characteristics of micro-fluidic OLED 14. Research proposed a combination of micro-fluidic and liquidOLED, and fabricated a first prototype micro-fluidic OLED. Optimized fabrication method was developed. The electroluminescence was obtained in the flowed liquidemitters under the appropriate applied voltage. The current density of 2.11 mA/cm2 was measured when 60 Vwas applied . In contrast thicker emitter layer, higher driving voltage thansolid state OLED. 15. Thank you 16. https://www.youtube.com/watch?v=9OvTLg4i2_U&amp;playnext=1&amp;list=PL7C0E1F21B3FB709C&amp;feature=results_main</p>