Location: CREOL Room 102, University of Central Florida

Organic Light Emitting Devices: Carrier Transport and Device Physics

Invited Speaker:   Dr. Franky So

Department of Materials Science and Engineering,

University of Florida,  Gainesville, FL 32611-6400

Abstract:

Ever since the invention of organic light emitting devices (OLEDs) in the late 1980’s, there has been a strong interest in considering organic semiconductors for electronics applications. Organic semiconductors are particularly interesting in that they can be processed at low temperatures and are compatible with roll-to-roll processing. Semiconducting polymer thin films, in particular, can be deposited by ink jet printing or flexo-printing. These processes allow fabrication of large area electronics which can not be realized with inorganic semiconductors.

 To realize organic semiconductors for electronics applications, understanding the carrier transport properties is of paramount importance. In this presentation, we will review the basic physics and chemistry of organic semiconductors, present recent results of bipolar carrier injection/transport measurements on polyfluorene polymers and finally discuss how they affect the OLED device performance.

 Biography:

Dr. Franky So received his B.A degree in physics from Hamilton College, M.S. in materials science from MIT and Ph.D. in electrical engineering from the University of Southern California. His thesis work was on heterostructure devices based on organic semiconductors. After his graduation in 1991, he was a research scientist at Hoechst Celanese Research Division working on high speed polymer electro-optical modulators and organic light emitting devices.  In 1993, he joined Motorola Phoenix Corporate Laboratories working on organic light emitting devices (OLED) for flat panel displays. He was then promoted to be the Program Manager responsible for the R&D activities in OLED technology development. During his tenure at Motorola, he received the Distinguished Innovator Award and the Master Innovator Award. In 2001, he joined OSRAM Opto-Semiconductors, formerly known as Siemens Optoelectronics Division, and became the Head of Materials and Devices Research. He had the worldwide responsibility managing the R&D activities in OLEDs for flat panel displays and solid state lighting. In summer 2005, he joined the faculty in the Department of Materials Science and Engineering at the University of Florida. He is now currently an Associate Professor in the Department. His research interest includes electronic properties of organic semiconductor thin films, charge transport properties, device physics, organic based light emitting devices, thin film transistors and large area sensor arrays. Dr. So is a Senior Member of IEEE.

For more information, please contact us by zge@mail.ucf.edu