IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

Terahertz Chiral Metasurface Based on Kirigami Structure for Controlling Circular Dichroism

Kyungbin Cho, Wonwoo Lee, and Hojin Lee

Abstract

 The utilization of terahertz (THz) frequency range in spectroscopy provides immense promise for various applications such as enantiomer identification, biomolecular analysis, medical diagnostics, pharmaceutical assessment, and security screening due to its unique characteristics, including linear wave propagation, object penetration, and low photon energy. Notably, terahertz circular dichroism (TCD) spectroscopy emerges as a potent tool for analyzing material properties and discerning enantiomers in biomolecules like nucleic acids and proteins. However, the inherent low response of biomolecules to circular dichroism (CD) in the THz range presents a formidable obstacle in biomolecular analysis. To address this challenge, chiral metamaterials offer a solution by enabling precise control over electromagnetic wave characteristics such as transmission, phase, and polarization in the THz range, thereby enhancing the amplification of chirality properties in materials. In this study, we propose a novel approach to manipulate TCD utilizing a chiral metasurface based on a kirigami structure.

IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

Enhanced Optoelectrical Properties of Organic Light-Emitting Diodes by ZnO Nanoparticles Reacted with Organic Solvents 

Changhee Lee, Ryungyu Lee, Keun-Yeong Choi, and Hojin Lee 

Abstract

 In this study, we propose a novel post-processing method aimed at enhancing the Luminance of organic light-emitting diodes (OLEDs). This method leverages the reactivity between zinc oxide (ZnO) and organic solvents to improve device performance. Specifically, we aimed to increase the hole-to-electron matching ratio within the light-emitting layer by deliberately reducing the number of oxygen vacancies. These vacancies serve as pathways for carrier movement, and their reduction through the reaction of ZnO particles with organic solvents results in lowered electron injection. Consequently, this modification effectively increases the generation of excitons in the post-processed devices, leading to a significant improvement in luminance.

IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

Silicon-integrated Photolithography of Small-molecule Phosphorescent Emitter for Ultrahigh-resolution Micro-OLEDs 

Ryungyu Lee, Keun-Yeong Choi, Hyukmin Kweon, Borina Ha, Changhee Lee, Soyeon Lee, Do Hwan Kim, and Hojin Lee

Abstract

 In this paper, we propose an ultrahigh-resolution organic lightemitting diodes (OLEDs) pixels patterned by conventional photolithography through by incorporating silicone into phosphorescent small-molecule networks. This siliconeintegrated phosphorescent organic light-emitting diode (SIphOLED), in which silicone molecules are homogeneously crosslinked with small-molecule light-emitting materials, can effortlessly achieve to 3,000 PPI ultrahigh-resolution patterns using the photolithography process.