OPB-LET (IMAGE) Technische Universität Dresden Caption The device architecture of organic permeable base light-emitting transistors (OPB-LET). Credit ©Zhongbin Wu 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.