Prof.  Guohua  Xie
The Institute of Flexible Electroncis (Future Technologies), Xiamen University,  China

Title: Solution-Processed OLEDs

Abstract:

Organic LEDs (OLEDs) have many promising applications in active matrix displays, solid-state lighting, visible light communication, and medical treatment, which make them attractive in fundamental and applied researches. Currently, the production of OLEDs mainly relies on high-vacuum thermal evaporation, which is fairly expensive and complicated. To address this issue, first of all, the highly efficient and solution-processable emitters are required. We managed to developing high-performance thermally activated delayed fluorescence emitters based on material engineering with charge transfer. The solution-processed OLEDs with nearly 100% exciton utilization efficiency could be demonstrated by introducing a small-molecular sensitizer. Based on a proof-of-concept of in-situ post-synthesis, we succeeded in fabricating full-color OLEDs by simply inkjet printing a single-component Lewis acid ink onto a Lewis base seeding layer. Meanwhile, to overcome the mismatch of the interfacial adhesion energy for transfer printing, a sacrificial layer mediated with the traceable amount of water in the polymer was introduced, which made it universal for transfer printing the commonly used organic semiconductors. Overall, the innovative technologies and in-depth understanding of solution-processed OLEDs will pay the way towards large-area and low-cost mass production.

Biography:

Guohua Xie obtained his Ph.D. degree in Microelectronics and Solid-State Electronics from Jilin University (China) in 2011, working on OLED microdisplays. From August 2011, Dr. Xie carried out his postdoctoral research at TU Dresden (Germany), sponsored by Alexander von Humboldt Foundation, investigating the stability of OLEDs. Later, Dr. Xie worked for an OLED-based interdisciplinary project to treat skin cancer with OLEDs at the University of St Andrews (UK) since 2013. From 2015, he worked for the College of Chemistry and Molecular Sciences of Wuhan University (China). Since 2023, Dr. Xie served as a full professor in the Institute of Flexible Electronics (Future Technologies) of Xiamen University, working on the interdisciplinary research of the emerging optoelectronic materials and devices. Dr. Xie has co-authored over 250 peer-reviewed publications and contributed to 1 book as the editor-in-chief. In 2020, Dr. Xie has been admitted as a Fellow of Royal Society of Chemistry. Now, Dr. Xie also serves as a Youth Editorial Board Member for The Innovation, InfoMat, and SmartMat. respectively. Meanwhile, he is currently an Academic Editor for The Innovation Materials.