| Biography | |
|---|---|
 Prof. Guohua Xie Wuhan University, China |
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| Title: High-Performance Thermally Activated Delayed Fluorescence Polymers for Efficient Electroluminescence | |
| Abstract: Light-emitting polymers featuring thermally activated delayed fluorescence (TADF) characteristics are attracting intensive interests in terms of developing low-cost and large-area light-emitting devices for practical applications in flat-panel displays and solid-state lighting. Due to the efficient reverse intersystem crossing process, TADF polymers can theoretically generate and utilize 100% of the excitons under electrical excitation. A series of bluish-green TADF polymers grafting the TADF moiety onto the side chain of the polymer backbone of polycarbazole were developed, resulting in 63.7% exciton utilization ratio under electroluminescence process. To further improve the performances, another series of bluish-green TADF polymers were synthesized via side-chain strategy, which completely inherited the TADF features of the side-chain TADF unit. Through the complicated fluorescence sensitization, the optimal device reached a considerably high external quantum efficiency of 16.1%, i.e. nearly 85% of the electrically generated excitons were utilized for light emission,. Finally, we designed a series of orange-red TADF polymers with a backbone-donor/pendant-acceptor structure with a PLQY up to 99%, and demonstrated highly efficient red TADF polymer based OLEDs with an EQE up to 19.4%, i.e., nearly 98% utilization ratio of the singlet and triplet excitons under EL process. By managing the incomplete energy transfer between the backbone and the orange-emitting TADF unit, the single-molecule white TADF polymer was demonstrated with high brightness. Reference [1] J. Luo, G. Xie, S. Gong, T. Chen, and C. Yang, Chemical Communications, 2016, 52, 2292. [2] G. Xie, J. Luo, M. Huang, T. Chen, K. Wu, S. Gong, and C. Yang, Advanced Materials, 2017, 29, 1604223. [3] Y. Wang, Y. Zhu, G. Xie, H. Zhan, C. Yang, and Y. Cheng, Journal of Materials Chemistry C, 2017, 5, 10715. | |
| Biography: Academic Experience 2015.01-Current, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, P. R. China (Associate Professor) 2013.01-2015.01, Organic Semiconductor Centre, University of St Andrews, UK (Research Fellow) 2012.01-2012.12, Institut für Angewandte Photophysik, Technische Universitaet Dresden, Dresde, Germany (Humboldtian Fellow) 2011.08-2011.12, Fraunhofer-Institute for Photonic Microsystems (COMEDD), Dresden, Germany (Humboldtian Fellow) | |
