A group of researchers from RIKEN and the UC San Diego has found a way to reduce the required energy to power up OLED displays. The group explained their latest findings in a paper published in Nature. OLED has become extremely popular over last couple of years as they offer significant advantages over other display technologies.
In order to find a way to reduce the required energy, the group manipulated the “excitons” which are responsible for transportation of electrons within OLEDs.
If you didn’t know, Excitons are pairs of electrons and holes. As the current passes through, an OLED device creates such pairs to emit visible lights. Excitons have two different patterns, one type with same spin and the other with opposite spin. The second type is considered as triplet and are more common. However, the OLED display can transform the singlets to triplets which require more energy.
Interestingly, the group of researchers found ways to lower this power requirement. In order to do so, they created an organic semiconductor and used a special technique to impart a negative charge to the molecule. Afterwards they used a microscope to luminate the molecule. The results show that the formation of triplets required less power.
In an official press release, Kensuke Kimura from RIKEN said, “We believe that we were able to do this thanks to a previously unknown mechanism, where electrons are selectively removed from the charged molecule depending on their spin state.”