A5006211645- Perovskite Materials and Applications
- Spacecraft Design and Technology
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Inertial Sensor and Navigation
- Organic Light-Emitting Diodes Research
- Advanced Photonic Communication Systems
- Spacecraft and Cryogenic Technologies
- Advanced Fiber Laser Technologies
- Solid-state spectroscopy and crystallography
- Space Technology and Applications
- ZnO doping and properties
- VLSI and Analog Circuit Testing
- Parallel Computing and Optimization Techniques
- Embedded Systems and FPGA Design
- Ferroelectric and Negative Capacitance Devices
- Space Satellite Systems and Control
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- Hydraulic and Pneumatic Systems
- Electromagnetic Launch and Propulsion Technology
- Muon and positron interactions and applications
- Rocket and propulsion systems research
- Optical properties and cooling technologies in crystalline materials
- Refrigeration and Air Conditioning Technologies
Samsung (South Korea)
2024
Korea Advanced Institute of Science and Technology
2019-2024
Government of the Republic of Korea
2019
Daejeon University
2019
Korea Aerospace Research Institute
2002-2015
Highly efficient vacuum-deposited CsPbBr3 perovskite light-emitting diodes (PeLEDs) are demonstrated by introducing a separate polyethylene oxide (PEO) passivation layer. A film deposited on the PEO layer via thermal co-evaporation of CsBr and PbBr2 exhibits an almost 50-fold increase in photoluminescence quantum yield intensity compared to reference sample without PEO. This enhancement is attributed interfacial defects perovskite, as evidenced temperature-dependent measurements. However,...
Perovskite nanocrystals (NCs) have attracted increasing interest in the realization of single-photon emitters owing to their ease chemical synthesis, wide spectral tunability, fast recombination rate constant, scalability, and high quantum yield. However, integration a single perovskite NC into photonic structure has yet be accomplished. In this work, highly stable individual zwitterionic ligand-based CsPbBr3 with circular Bragg grating (CBG) is successfully demonstrated. The far-field...
We report the formation of a new class solvent-intercalated two-dimensional (SI-2D) formamidinium lead halide perovskites.
A novel approach to producing high-color-purity blue-light-emitting diodes based on single-crystalline Ruddlesden-Popper perovskites (RPPs) is reported. The utilization of a pure bromide composition eliminates any possibility halide segregation, which can otherwise lead undesired shifts in the emission wavelength or irreversible degradation spectral line width. Phase-pure PEA2MAPb2Br7 single crystals with lateral size exceeding 1 cm2 be synthesized using inverse temperature crystallization...
Abstract Quasi‐2D Ruddlesden–Popper perovskite (RPP) have surfaced as a promising candidate for light emitting diodes (LEDs) due to its outstanding optoelectronic properties. However, reliable approach patterning RPPs remains elusive the use of polar solvents in lithographic processes, which can damage RPP. Here, and damage‐free dry micropatterning method is reported, also offers cost/time advantage compared conventional methods. The sharp edges high aspect ratio silicon micropillars are...
To achieve pure-blue emission (460-470 nm), we manipulate the crystallization process of quasi-2D perovskite, (PBA)2Csn-1PbnBr3n+1, prepared by a solution process. The strategy involves controlling distribution "n" phases with different bandgaps, solely utilizing changes in precursor's supersaturation to ensure that desired aligns smallest bandgap. Adjustments photoluminescence (PL) wavelength are made changing solute concentration and solvent polarity, as these factors heavily influence...
We report the synthesis of Bi-based lead-free halide perovskite nanocrystals (NCs) via a ligand-assisted reprecipitation (LARP) method. Detailed chemical analysis synthesized Cs–Bi–Br NCs, which are commonly called stoichiometric Cs3Bi2Br9, revealed that actual composition NCs was extremely Cs deficient. Photoluminescence (PL) spectra from Cs-deficient and BiBr3 were nearly identical except for higher emission intensity with Cs, suggested origin PL BiBr3, inclusion few atomic percentages...
Zinc tin nitride (ZTN) compounds exhibit excellent optical and defect-tolerance properties desirable for optoelectronic applications. However, the synthesis of high-phase-purity ZTN is limited by oxidation. We report amorphous films with oxidation resistance a wide range compositions (from pure Zn3N2 to Sn/(Sn + Zn) up 66.9%). employ modified pulsed plasma-enhanced chemical vapor deposition alternating pulses zinc precursors. observe correlation between pulse duration Zn precursor....
The third-generation Korean sounding rocket, KSR-III, was successfully launched on Nov. 28, 2002 from the western coastal area of Peninsula. previous KSR-I and -II series had employed a solid propulsion system whereas KSR-III utilizes Korea’s first liquid system. prime objective mission to evaluate performance onboard electronics is an enhanced version ones used in series. has extended data channels adopted distributed processing using RS-485 bus network. rocket various sensors measure...
KSLV (Korea Space Launch Vehicle)-I is under development to place a 100-kg class satellite into low earth orbit of 300/spl times/1500km. KSLV-I telemetry system will be composed two streams: lower (first) stage stream and an upper (second) stream. Different from the previously developed by KARI for KSR Sounding Rocket) series, new has been required meet enhanced requirements on system. This paper introduces with MIL-STD-1553B data bus emphasizing design, implementation, evaluation test...
Abstract Lead halide perovskites exhibit a very wide color gamut due to their extremely narrow emission spectra, typically characterized by full‐width at half‐maximum (FWHM) of less than 20 nm. Significant advancements have been made in developing highly efficient and stable green, red, near‐infrared perovskite light‐emitting diodes (PeLEDs). However, achieving pure blue‐emitting PeLEDs remains significant challenge. In this work, we successfully synthesized monoanionic octyl‐phosphonate...
Since modern MCM (Multi Chip Module) is required to provide higher performance, MCM's density and power consumption has been increased very rapidly. Increase of chip lead hot spots which accelerate the device's life time result in device failure long run. In this paper, a new placement method presented improve reliability using TPSA (Two-Phase Simulated Annealing) algorithm. The searches lowest rate perturbing phase lower at same generate movement. proposed algorithm applied IBM...
Korea Space Launch Vehicle-I (KSLV-I) carrying the STSAT-2A satellite, made its maiden flight on August 25, 2009. Liftoff was from Aerospace Research Institute (KARI) launch site at Naro Center in a southern coastal province of Korean peninsula. A video telemetry system provided visual monitoring critical events, as well dynamic moving images, through two cameras equipped upper stage. This paper describes development onboard consisting cameras, compression unit and an RF transmitter meeting...
Perovskite nanocrystals (NCs) have attracted increasing interest for the realization of single-photon emitters, owing to their ease chemical synthesis, wide spectral tunability, fast recombination rate, scalability, and high quantum yield. However, integration a single perovskite NC into photonic structure is yet be accomplished. We successfully coupled highly stable individual zwitterionic ligand-based CsPbBr3 with circular Bragg grating (CBG). The far-field radiation pattern inside CBG...