A5100609429- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Ga2O3 and related materials
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Polyoxometalates: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Zeolite Catalysis and Synthesis
- Luminescence and Fluorescent Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced optical system design
- Impact of Light on Environment and Health
- MRI in cancer diagnosis
- Advanced battery technologies research
- Semiconductor Quantum Structures and Devices
- Advanced Memory and Neural Computing
- Model Reduction and Neural Networks
- Semiconductor materials and interfaces
- Metal and Thin Film Mechanics
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Supercapacitor Materials and Fabrication
- Gaussian Processes and Bayesian Inference
- Silicon Nanostructures and Photoluminescence
- Photochromic and Fluorescence Chemistry
Yonsei University
2018-2024
Korea Polytechnic University
2017
Advanced Institute of Convergence Technology
2017
National Cancer Center
2017
Gwangju Institute of Science and Technology
1997-2011
Inha University
2004
Optical encryption using coloration and photoluminescent (PL) materials can provide highly secure data protection with direct intuitive identification of encrypted information. Encryption capable independently controlling wavelength-tunable as well variable light intensity PL is not adequately demonstrated yet. Herein, a rewritable structural color (SC) display suitable for dual-responsive optical developed stimuli-responsive SC block copolymer (BCP) photonic crystal (PC) alternating...
Abstract A periodic ordered mesoporous organosilica containing uniform ethane groups in the pore walls was prepared using microwave heating to produce 1.5–2.5-μm particles with spherical morphology.
Optical Encryption Both wavelength-tunable coloration and light intensity-tunable photoluminescence are independent reliably manipulated in a rewritable dual-responsive encryption display based on block copolymer self-assembly. The has the benefit of being direct intuitive identification encrypted information by human eye, enabling high security anti-counterfeiting. More details can be found article number 2310130 Cheolmin Park co-workers.
We report on the fabrication of highly integrated semipolar {101} GaN micro-pyramid light-emitting diode (LED) arrays a c-plane sapphire substrate obtained via confined selective area growth (SAG). The cathodoluminescence (CL) revealed that were under severe local strain and potential fluctuations observed depending location pyramid facets. emissive region in facets was also found to be different monochromatically captured CL images. Furthermore, electroluminescence (EL) LED had palpable...
The control of the refractive index and electrical conductivity in dielectric layer omnidirectional reflectors (ODRs) is essential to improve low efficiency AlGaN-based UV emitters. Here, we report self-assembled indium tin oxide (ITO) nanoball-embedded (NODRs) for use high-efficiency emitters at 365 nm. These NODRs consisted a reflective Al layer, conducting ITO nanoball current injection spreading, nanovoids that provided achieve highly efficient NODR was able realize both high...
Abstract Stimuli-responsive systems are attractive since their properties can be controlled by external stimuli and/or surrounding environment. Recently, more than one stimulus is utilized in order to enhance the performance of systems, or bypass undesired effects. However, most previous research on multi-stimuli has been focused enhancing inducing changes type response. Herein, we developed a nanocomposite material with independent multi-states composed photo-responsive polymer and quantum...
Multistimuli responsive materials are advantageous in that they can enhance the desired response or bypass unwanted reactions. Light is one of most attractive stimuli since it allows remote spatiotemporal control and multiplexing properties (e.g., wavelength, intensity, irradiation time, pulsed/continuous wave) for application on multiphotoresponsive materials. However, operating wavelength such photoresponsive systems often includes an ultraviolet (UV) range limits its use biomedical field....
Transition metal layered double hydroxides (LDHs) are often hybridized with conductive materials for supercapacitor electrodes to facilitate charge transport. Although diverse forms of LDH carbon have been designed, it has not yet systematically studied how morphology and composition simultaneously affect the performance supercapacitors. Herein, we synthesize LDHs grown on nitrogen-doped porous (NPC) as hybrid battery-like via both electrodeposition solvothermal methods, where investigate...
나트륨(Na) 함유량이 다른 세 종류의 유리관인 Borosilicate(<TEX>$Na_2O$</TEX> 4%), Soda-Lime(<TEX>$Na_2O$</TEX> 14%), 그리고 Aluminosilicate(<TEX>$Na_2O$</TEX> 0.06%) 유리관의 방전 실험을 통하여 유리관 내벽의 흑화를 관측하였다. 수은 혼합기체(Ne+Ar+Hg)의 방전에서 나트륨 많은 유리관일수록 흑화가 심하게 나타난다. 무수은 가스(Ne+Ar)의 방전에서는 나타나지 않는다. 램프에서 봉입 기체의 압력이 작을수록 흑화의 정도가 커진다. 흑화 방지재를 도포한 유리관은 미약하게 이 흑화는 유리재의 성분과 이온의 결합에 의한 아말감(<TEX>$NaHg_2$</TEX>)이 내벽에 형성된 것으로 분석된다. The different degrees of blackening were observed at the inner surface borosilicate, soda-lime, and...