Project 4: Efficient and bright light-emitting diodes on single-layer graphene electrodes
Organic light-emitting diodes (OLEDs) are emerging as leading technologies for both high quality display and lighting. OLEDs consist of active organic luminescent structure sandwiched between two electrodes, one of which must be transparent. Currently, indium tin oxide (ITO) is the most widely used material for the transparent conductors (TCs) electrodes. However, the rising price and limited geographical availability of Indium, asks for alternative transparent conductors (TCs) for the next generation of OLED devices. The next generation of optoelectronic devices requires transparent conductive electrodes to be lightweight, flexible, cheap, environmentally attractive, and compatible with large-scale manufacturing methods. Graphene could be ideal for replacing transparent electrodes made of expensive indium tin ITO in OLEDs. However, even the best graphene anode OLEDs made today are incapable of emitting light very efficiently because graphene has a low work function and high sheet resistance. This research proposal is to overcome these problems through two approaches. The first approach is to use a metal oxide film (for example, molybdenum trioxide, MoO3) as an intermediate layer between the graphene and the OLED layers. The second approach is by modifying the surface of the graphene using water-dispersed conducting polymer and a perfluorinated ionomer. We expected the results of this propose research able to confirm that graphene electrodes could be used to make a high-performance and flexible OLED devices.
Prof. Dr. Muhamad Bin Mat Salleh
|Assoc. Prof. Dr. Akrajas Ali Umar|
|Assoc. Prof. Dr. Mohd. Yusri Abd Rahman|
|Assoc. Prof. Dr. Dee Chang Fu|
|Dr. Yap Chi Chin |
Prof. Emeritus Dato’ Dr. Muhammad Yahaya