Nanostructured OLED Photonics
Invited Talk: Nanostructured OLED Photonics
It has been challenging to measure the optical modes in an OLED. Here, we will describe how we use angle-resolved electroluminescence spectroscopy (ARES) to directly measure the optical modes of a nanostructured OLED. Specifically, we use ARES to measure the cavity modes in a planar OLED and measure the waveguide modes and surface plasmon polariton (SPP) modes of a nanostructured OLED. With this technique, we can determine how different optical modes are extracted due to different photonic crystals.
Making use of ARES, we can design an OLED and just selectively extract the TE waveguide mode, resulting in a device with highly directional emission. Using the information obtained from ARES, we designed a high-efficiency linearly-polarized OLED and demonstrated an OLED emitting linearly polarized light without a current efficiency exceeding 130 cd/A without using a polarizer. By carefully engineering the nanostructure, we have recently demonstrated a “laser-like” OLED with extremely directional emission and a very narrow full-width half maximum in the emission spectrum. Finally, we will describe how we make a single-sided emission transparent OLED.
Speaker Information
Prof. Franky So, Walter and Ida Freeman Distinguished Professor, Department of Material Science and Engineering
North Carolina State University, Raleigh, North Carolina, USA
Prof. Franky So received his PhD degree in electrical engineering from the University of Southern California in 1991. He has previously worked at Hoechst Celanese Research Division and Motorola. In 2001, he joined OSRAM Opto Semiconductors and became the Head of OLED Research. He joined the University of Florida in 2005 and became the Rolf E. Hummel Professor in Electronic Materials in the Department of Materials Science and Engineering at the University of Florida. In 2015, he joined the Department of Materials Science and Engineering at the North Carolina State University where he is currently the Walter and Ida Freeman Distinguished Professor. While at Motorola, he was named the Distinguished Innovator and Master Innovator. Dr. So holds 120 issued patents and has published more than 200 journal articles with a Google H-index of 88. He is the Editor-in-Chief of the journal Materials Science and Engineering Reports and serves as an Associate Editor for IEEE Journal of Photovoltaics, IEEE Journal of Display Technology, SPIE Journal of Photonic Technology and Organic Electronics. So is a recipient of the 2024 Jan Rajchman Prize from the Society for Information Displays, a Distinguished Lecturer of the IEEE Photonics Society, a Fellow of the National Academy of Inventors, and a Fellow of IEEE, MRS, SID, OSA and SPIE.
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- Electrical Engineering
- Taipei, T'ai-pei
- Taiwan 106
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