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Application of g raphene on OLEDs devices

Application of g raphene on OLEDs devices . Group 10 Tun -Wei Hsu Chun-Fu Kuei 14/10/13. Applications of OLEDs . 4 Steps. 1. Carriers injection. Electroluminescent Devices. 2. Carriers transport.

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Application of g raphene on OLEDs devices

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  1. Application of graphene on OLEDs devices Group 10Tun-Wei HsuChun-Fu Kuei14/10/13

  2. Applications of OLEDs

  3. 4 Steps 1. Carriers injection Electroluminescent Devices 2. Carriers transport Electroluminescence from conjugated polymers was first reported in 1990, using PPV as an emissive layer. 3. Formation of excitons 4. Radiative deactivation Hole injection layer Hole transport layer organic materials Cathode c a t h o d e i n d i u m - t i n o x i d e a n o d e Combination Anode g l s s s u b t r t a s a e Electron transport layer Multilayer devices are usually fabricated to attain balance by inserting holetransporting (or injecting) layer (HTL) or electron transporting (or injecting) layer (ETL) into emitting layer. Emitting layer Ref. Burroughes et al., Nature 1990, 347, 539.

  4. Disadvantages of ITO • Expensive the cost of indium and the low throughput deposition process • Hard (not flexible) metal oxides such as ITO (about 150 nm thick to ensure electrical performance) are brittle and therefore of limited use on flexible substrates • Metal Diffusion indium is known to diffuse into the active layers of OLEDs, which leads to a degradation of performance over time

  5. Alternative transparent electrodes

  6. Graphene film preparation • Graphene Oxide(GO) dispersed in water A graphite crystal Graphitic Oxide GO • Spin coating on the quartz • Reducing GO by vacuum annealing

  7. Graphene vs. ITO--Experimental results

  8. Conclusion • The electrical and optical performance of a small molecule OLED on graphene is similar to that of control devices on ITO. • However, those problem could be solved by using different processes. • Moreover, graphene has tremendous advantages, which can not be observed on ITO materials.

  9. Reference • http://www.printedelectronicsworld.com/articles/spray-coating-and-spin-coating-of-rgo-thin-film-sheets-00005228.asp?sessionid=1 • Organic Light-Emitting Diodes(OLED) on Solution-Processed Graphene Transparent Electrodes, ACS Nano2010, 4, 43–48 • P. C. Yang, H. Wu, Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li, Taiwan • Burrougheset al., Nature 1990, 347, 539

  10. Method to improve the performance • Extremely efficient flexible organic light-emitting diodes with modified grapheneanode, Nature Photonics 6, 105–110 (2012)

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