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[Seminar]-Prof.Qibing Pei-University of California, Los Ange
Time:2015-06-24 11:07Source:未知 Author :Zhang shengli Click:
Time:       06/25/2015 10:00 AM           
Location:   building 340 room 201
Speaker:   Prof.Qibing Pei, University of California, Los Angeles
Title:     Flexible and Stretchable Polymer Electronic Materials and Thin Film Devices
Inviter:     Haibo Zeng
Sponsor:   Institute of Optoelectronics and Nanomaterials

Intrinsically stretchable electronics entails the electrode, semiconductor, and dielectric materials all being deformable, and that a suitable deposition, patterning, and overlaying protocols are developed for the soft materials. In this presentation, I will focus on (1) the development of a polymer composite comprising surface-embedded silver nanowires with high transparency, high surface conductivity, and low surface roughness, and (2) the in-situ formation of a PIN junction in a polymer thin film to simplify the architecture of polymer light emitting diodes. The mechanical properties of the transparent composite electrode are determined by the polymer matrix employed, and demonstrated properties include flexibility, shape memory, self-healing, and rubbery deformation. The new electrode has been used to replace ITO/glass in fabricating organic light emitting diodes with significantly enhanced luminous efficiency. We have also demonstrated stretchable transparent Joule heater, touch and pressure sensors, large-strain actuators, and thin film transistors, all with rubbery elasticity. The PIN junction formation allows the use of a relatively thick emissive polymer layer and any conductive material as the electrodes in OLEDs. The combination the new OLED architecture and the composite electrode allows for all-solution fabrication of OLEDs and the demonstration of highly stretchable OLEDs. 

Qibing Pei is Professor of Materials Science and Engineering at UCLA. He specializes in synthetic polymers and composites for electronic, electromechanical, and photonic applications, with over 140 peer-reviewed journal publications and 40 awarded US patents. His current research activities include synthesis of conjugated polymers, flexible and stretchable organic electronic devices, nanostructured composites for radiation scintillation, polymer actuators and generators. He received a B.S. degree in chemistry from Nanjing University, China, and a PhD in polymer science from the Institute of Chemistry, Chinese Academy of Science, Beijing. He was a postdoctoral scientist in Linköping University, Sweden, senior chemist at UNIAX Corporation (now DuPont Display), Santa Barbara, California, and senior research engineer at SRI International, Menlo Park, California. He has been on the UCLA faculty since 2004. He is a Fellow of the SPIE, member of the American Chemical Society and Materials Research Society, Associate Editor of Smart Materials and Structures, Soft Robotics, and serves on the Advisory Board of International Journal of Smart and Nano Materials.
(Editor:Zhang shengli)