Organic light emitting transistors (OLETs) and organic light emitting diodes (OLEDs)

Organic light emitting transistors (OLETs) are devices that have both the light emission feature of organic light emitting diodes (OLEDs) and also the switching property of thin film transistors (TFTs) in the same component.  The combination of these two properties makes for instance possible simpler display architectures when compared to e.g. active-matrix OLED displays consisting of separate OLED panel and TFT backpanel controlling OLED operation.

The main research focus in our OLET research is on fabrication of these components using inkjet printing. Printed electronics represents an alternative to traditional silicon-based semiconductor industry, which can produce high quality products but is facing its limits in price reduction since its laborious fabrication processes. Inkjet printing is a popular deposition method in printed electronics research due to its flexible digitally controlled printing process and versatile possibilities  for process modifications. Experience gained from inkjet printing research can be further exploited when moving to fabrication of components using higher throughput printing methods. 

Schematics of an organic light-emitting transistor.

Tests of light-emitting diodes.

Last updated: 9.9.2016