May 17, 2017: The new generation OLEDs are using graphene which is a highly conductive material. It is lightweight, transparent and extremely strong. A number of scientists see graphene as the basis for a new generation of electronics. This is mostly due to its power and also the fact that it can be crumpled and bended appeals right away.
While researchers continue to develop the first thin, foldable computer, a breakthrough has been made with OLEDs needed to power such a device. And the name is none other than graphene.
Achievement with the flexible OLED has come from South Korea. Here, the study is led by Professor Tae-Woo Lee from Pohang University of Science and Technology and Professor Seunghyup Yoo from the School of Electrical Engineering, KAIST.
Using graphene as a transparent electrode
The lights use graphene as a transparent electrode. This is placed between titanium dioxide and polymer layers. The lights are placed in a stack arrangement, within layers of plastic or even glass. The layers are super thin and a number of organic compounds layers are put in between two electrodes which are anode and cathode.
The lights function by an electrical energy being applied all over the electrodes. The electrons from the cathode and holes from the anode draw towards each other. They convene in the emissive layer, where light is generated through the discharge of energy as a photon. Varied kinds of lighting effects are achievable, depending on as to whether the LED releases from the top or bottom.
Graphene: The next big thing for OLEDs?
Whilst graphene LEDs have been developed earlier, the competence has been incomplete due to photon loss, an occurrence known as ‘loss from surface plasmon polariton.’
The recently developed devices have beat this through consisting of a transparent structure within which a titanium oxide layer with a high refractive index along with a hole-injection coating of conducting polymers with a low refractive is placed between the graphene electrodes.