Vertical organic light emitting transistors in the presence of various ETL materials

We fabricated vertical organic light emitting transistors (VOLETs) with various ETL materials to investigate physical and electrical properties about carrier injection in the device performance. On-off ratio of the device with Alq3, TPBi and 3TPYMB are 3080, 56.0 and 73.9 respectively. ETL materials were selected for VOLET based upon low electron mobility and minimum energy barrier between EML and ETL.