What They Say
Researchers at the Institute for Applied Physics at TU Dresden have had a paper published in ‘Nature Materials’ that suggests a new device concept for high-efficiency and low-voltage vertical organic lighting-emitting transistors (OLETs). The device combines a a vertical organic permeable base transistor (OPBT) and an OLED. With this novel device concept of an organic permeable base light-emitting transistor (OPB-LET), the researchers succeeded in combining the function of a highly efficient switching transistor.
The device overcomes challenges of increasing device efficiency while keeping operating voltages low.
“The key to construct the high performance OPB-LETs is the permeable base electrode located at the center of the device, forming a distinctive optical microcavity and regulating charge carrier injection and transport. The thus designed three-terminal vertical optoelectronic devices can simultaneously high efficiencies (up to 24.6%), high luminance (up to 12,513 cd m²), and low driving voltages (<5.0 V),”
The performance of OPB-LETs demonstrated in this work is claimed to be comparable to state-of-the-art OLEDs and cutting-edge, low-voltage organic transistors. Prof. Karl Leo explained:
“We expect that this novel device principle will pave the way for highly-efficient flexible displays with a rather simple pixel design.”
What We Think
We’re planning a deeper dive into this very interesting development. The University has been working on vertical organic transistors for other applications, as well. (BR)
OPB LETs – Click for higher resolution
