1 / 12

Organic Light-Emitting Diodes(OLED) on Solution-Processed Graphene Transparent Electrodes

Organic Light-Emitting Diodes(OLED) on Solution-Processed Graphene Transparent Electrodes. Wu, J.; Agarwal , M.; Becerril , H. A.; Bao, Z.; Liu, Z.; Chen, Y.; Peumans , P . ACS Nano 2010 , 4, 43–48. Graphene VS. Indium tin-oxide (ITO ). Outline. Introduction to OLED

suzy
Download Presentation

Organic Light-Emitting Diodes(OLED) on Solution-Processed Graphene Transparent Electrodes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Organic Light-Emitting Diodes(OLED) onSolution-Processed GrapheneTransparent Electrodes Wu, J.; Agarwal, M.; Becerril, H. A.; Bao, Z.; Liu, Z.; Chen, Y.; Peumans, P. ACS Nano2010, 4, 43–48 Graphene VS. Indium tin-oxide (ITO)

  2. Outline • Introduction to OLED • Disadvantages of ITO • Experimental results • Simulated results

  3. Introduction to OLED • Working principle • Application (thinner, brighter and more flexible)

  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 Looking for other transparent electrodes……

  5. Alternative transparent electrodes potentials for thin transparent electrodes this work: ~7nm thick, , at 550nm

  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 • Current density and luminance computer display 50~300 cd/m2 Graphene ITO 0.02 4.5V 3.8V 300 11.7V 9.9V Similar performance despite the higher sheet resistance and different workfunction

  8. Graphene vs. ITO--Experimental results • External Quantum Efficiency(EQE) and Luminous Power Efficiency (LPE) The nearly identical EQE is surprising because the fraction of optical power that couples out of an OLED structure depends strongly on the thickness of the various layers

  9. Graphene vs. ITO--Simulated results • Various optical modes generated ST---substrate trapped modes WG---wave-guided modes SPP-surface plasmon polariton UB---unbound air modes

  10. Graphene vs. ITO--Simulated results • Spectral and angular dependence Lambert’s cosine law and equal brightness effect

  11. Graphene vs. ITO--Simulated results • Power distribution with wavelength and in-plane wave-vector differences in layer structure no WG in Graphene

  12. Conclusion • The electrical and optical performance of a small molecule OLED on graphene is similar to that of control devices on ITO

More Related