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Over the last three decades, there has been explosive growth in both the diversity of materials and technologies for display and imaging. Photoactive materials and optical patterning of materials are the core area of display and imaging and thus become the main focus of the research community. The articles contained in this inaugural issue of the Display and Imaging (DI) share a thematic of optical patterning for photoactive materials as a feature article and original work. Hong-Bo Sun et. al, summarize recent progresses in the fabrication of periodic microstructure in organic light-emitting devices (OLEDs) and their effects on improving the device performance. Here they turn to the waveguide and surface plasmon-polariton (SPP) modes by employing the microstructure, to enhance light extraction in OLEDs. The introduction of the periodic corrugation into the top-emitting OLEDs (TOLEDs) is effective in relieving the trade off between device lifetime and efficiency. Kwang-Sup Lee et. al, review the state of the art in materials used for twophoton cationic polymerization in the context of two-photon lithography. Exploration of two-photon induced photoacid generation implicitly touches on the catalytic cationic chemical amplification reaction of either positive or negative photoresists to shine the design and applications of two-photon sensitized photoacid generating systems. Chantal Andraud et. al, review on recent developments in nonlinear biophotonics in a chemist perspective. The recent emergency of biophotonics, and particularly microscopic bio-imaging, has been a major topic of research, notably in lasers and dyes (fluorescent or photoresponsive). They unveil several classical applications of biophotonics namely: cellular compartment staining, pH and polarity probes, chemical sensing, photo-responsive probes and in vivo full organ imaging. The review of 3D Display Technology by Nam Kim et. al, covers the major trends in 3D-display technology including stereoscopic display, integral imaging display, head-mounted display, volumetric display, and holographic display. Norihisa Kobayashi et. al, report original work on the effect of TiO2 nanoparticles on electrochemiluminescence of a Ru(bpy)3 based emissive display. Electrochemiluminescence (ECL) is known as electrochemical reaction exhibiting emission, and is applicable to new imaging device. In this work they show dramatically improved emission intensity and ECL life time by adding TiO2 nanoparticles. Although I could not invite all the current hot research in this area, mainly due to the limited page and time for this very first issue, I believe this issue contains informative and creative research results, thus I hope that this cutting edge science will open a door to the discovery of new display and imaging materials in the near future. I express my deepest gratitude to the contributors for this issue and the Editors of DI for their editorial help and this opportunity.

Eunkyoung Kim
Regional editor, Display and Imaging (DI)
Professor, Department of Chemical and Biomolecular Engineering, Yonsei University
50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, South Korea
Tel:82-2-2123-5752(o), 82-2-365-5751(Lab)
E-mail:eunkim@yonsei.ac.kr, eunkim1@yonsei.ac.kr
http://web.yonsei.ac.kr/eunkim http://web.yonsei.ac.kr/APCPI
Eunkyoung Kim

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