Taiwan NTHU develops high efficient OLED to set a new world record

　Teamwork by and among Prof. CHENG, Chien-Hong, Prof. LIU, Rai-Shung of the Department of Chemistry and Prof. LIN, Hao-Wu of the Department of Materials, Science, and Engineering of Taiwan National Tsing Hua University has successfully achieved a significant breakthrough in the research of “new diboron illuminating materials”, representing a great leap forward in OLED technology (organic light-emitting diode) which is commonly used in smartphone screen, high definition displays, and all kinds of illuminating lights. Tsing Hua University team presented this successful technology at the Ministry of Science and Technology, which technology uses new diboron materials in green OLED emitting layer to not only set the world record of efficiency but also lower down cost to a great extent.  National Tsing Hua University’s performance has been made public on the Nature Photonics.  Moreover, the technology has been successfully patented in Taiwan and relevant patent applications for the same technology have been filed in the US, Japan, and China.

  

　According to Prof. CHENG, Chien-Hong, the new diboron material is characterized by the 3^rd-generation thermally activated delayed fluorescence and its rod-like compounds would cause materials to align horizontally under thermal evaporation and concurrently increase light extraction efficiency.  Its structure breaks through the external quantum efficiency limitation of the conventional fluorescence and phosphorescence OLED.  Highly efficient green OLED components are produced through combination of practiced components processing and variable-angle spectrum measurement technology, which achieves a high external quantum efficiency of about 38% with an efficiency roll-off of only 0.3% at 1,000 cd/m².  

　The teamwork performance will be further developed in the “Frontier Research Center on Fundamental and Applied Sciences of Matters” headed by Prof. LIU, Rai-Shung to expand its practical application in material derivatization and OLED lifetime testing with an expected goal of commercialization to be accomplished with two years.  (March 2018)

/CCS