Graduate Research Assistant, University of Tennessee, Knoxville
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“Integrating the spin, energy, and polarization parameters towards advanced organic optoelectronics”
Spin, energy, and polarization represent the fundamental parameters to control the optoelectronic and spintronic processes in functional semiconductor materials including organics and hybrid perovskites. By integrating polarization- & time- resolved light-emission and pump-probe transient absorption altogether with electromagnet and multiple optical/electrical excitation sources, we can explore how to control the spin, energy, and polarization parameters in functional semiconductor materials at different length scales and time scales. This can largely extend our capability to investigate fundamental optoelectronic processes based on organic molecules and hybrid perovskites. Especially, we have found the cooperative relationship between the spin, energy, and polarization parameters in the 3rd generation thermally activated delayed fluorescence
(TADF) based OLEDs. Thus, the conversion from non-radiative triplets to radiative singlets can be largely enhanced to realize the extremely high external quantum efficiency (EQE) in OLEDs. Furthermore, in the exciplex host iridium complex system, we have demonstrated the polarization memory as the key factor to determine the EQE of the OLEDs through the light-out coupling.
Clearly, the integration of spin, energy, and polarization parameters represents a fundamental principle for both frontier science and applications on designing next-generation organic optoelectronic materials/devices.
Miaosheng Wang, Graduate Research Assistant, University of Tennessee, Knoxville
Miaosheng Wang is currently pursuing his Ph.D. degree in the Department of Materials Science and Engineering at the University of Tennessee, Knoxville. He received the B.S. degree in Materials Physics (2015) in School of Physics and Technology at Wuhan University, China. His current research interests focus on optoelectronics, spintronics, ultrafast laser spectroscopy, and the photophysics in organic semiconductors & hybrid perovskites.