New strategy for efficient OLED active matrix displays
In a new publication in the scientific journal “Nature Materials”, researchers of the Institute for Applied Physics at TU Dresden introduce a novel device concept towards high-efficient and low-voltage vertical organic lighting-emitting transistors. With the new device architecture and fabrication technology, the team paves the way for a broad application of efficient OLED active matrix displays.
In the group of Prof. Karl Leo, physicists, material scientists and engineers are working jointly on the development of novel organic materials and devices for high performance, flexible and possibly even biocompatible electronics and optoelectronics of the future. Increasing the performance of organic devices is one of the key challenges in their research. It was only last year, when the team headed by Dr. Hans Kleemann announced an important breakthrough with the development of efficient, printable vertical organic transistors.
Now Dr. Zhongbin Wu, Dr. Yuan Liu, and PhD student Erjuan Guo present the first electronic device that combines 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 and an organic light-emitting diode as commonly employed in active matrix displays. Active matrix liquid crystal displays (AMLCD) usually contain a matrix of thin-film transistors to drive LCD pixels. Each individual pixel has a circuit with active components (mostly transistors).
In this context, organic light-emitting transistors, three-terminal devices combining a thin-film transistor with a light-emitting diode, have generated increasing interest. However, increasing their efficiency while keeping the operating voltage low remains a key challenge. “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 m-2), and low driving voltages (<5.0 V),” explains Erjuan Guo.
The performance of OPB-LETs demonstrated in this work is comparable to state-of-the-art OLEDs and cutting-edge, low-voltage organic transistors. Prof. Karl Leo explains: “We expect that this novel device principle will pave the way for highly-efficient flexible displays with a rather simple pixel design.”
Erjuan Guo (English)
Prof. Karl Leo (Deutsch)
Chair of Optoelectronics
Z. Wu, Y. Liu, E. Guo, G. Darbandy, S.-J. Wang, R. Hübner, A. Kloes, H. Kleemann, and K. Leo “Efficient and low-voltage vertical organic permeable base light-emitting transistors”, Nature Materials, DOI: https://dx.doi.org/10.1038/s41563-021-00937-0
All latest news from the category: Physics and Astronomy
This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.
innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.
Advancing materials science with the help of biology and a dash of dish soap
High-speed X-ray free-electron lasers have unlocked the crystal structures of small molecules relevant to chemistry and materials science, proving a new method that could advance semiconductor and solar cell development….
Zeolite nanotube discovery made by researchers at Georgia Tech
Zeolites, which are crystalline porous materials, are very widely used in the production of chemicals, fuels, materials, and other products. So far, zeolites have been made as 3D or 2D…
Impossible material made possible inside a graphene sandwich
The design of new materials allows for either improved efficiency of known applications or totally new applications that were out of reach with the previously existing materials. Indeed, tens of…