OLED Focusing on Charge Balance (IMAGE) Japan Science and Technology Agency Caption The Co-host expanded the recombination zone, which was previously biased toward the electron transport layer to the entire light-emitting layer, and the compounding ratio of the host was optimized. As a result, the time until the brightness decreased by 5% was 10 times or more, and the lifetime was extended. Credit Kyulux Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.