A5023916165- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Phase-change materials and chalcogenides
- Chalcogenide Semiconductor Thin Films
- Solid State Laser Technologies
- Nuclear materials and radiation effects
- Radioactive element chemistry and processing
- Photonic Crystals and Applications
- Recycling and utilization of industrial and municipal waste in materials production
- Optical properties and cooling technologies in crystalline materials
- Nuclear Materials and Properties
- Nonlinear Optical Materials Studies
- Photorefractive and Nonlinear Optics
- Perovskite Materials and Applications
- Advanced Semiconductor Detectors and Materials
- Crystal Structures and Properties
- Semiconductor Lasers and Optical Devices
- Pigment Synthesis and Properties
- Graphite, nuclear technology, radiation studies
- X-ray Diffraction in Crystallography
- X-ray Spectroscopy and Fluorescence Analysis
- Nanocluster Synthesis and Applications
- Material Science and Thermodynamics
- Electronic and Structural Properties of Oxides
Pohang University of Science and Technology
2015-2024
John Wiley & Sons (United States)
2018-2023
Hudson Institute
2018-2023
Moss Landing Marine Laboratories
2022-2023
Advanced Engineering (Czechia)
2017-2020
Cheongam College
2019
Government of the Republic of Korea
2016-2018
Korea Institute of Industrial Technology
2017
Adama Science and Technology University
2015
Wuhan University of Technology
2013-2014
Phosphor-in-glass (PiG) typed robust color converters were fabricated using Pb-free silicate glasses for high-power white LED applications. SiO2-B2O3-RO(R=Ba,Zn) glass powder showed good sintering behavior and high visible transparency under the condition of 750 °C 30 min without noticeable interaction with phosphors. By simply changing thickness PiG plate or mixing ratio to Y3Al5O12:Ce3+ phosphor, CIE chromaticity coordinates can be easily controlled. Enhanced thermal quenching property...
An infrared-transmitting chalcogenide fiber was used as an optical probe to analyze qualitatively and quantitatively various chemical substances in aqueous solutions. unclad with 380-microm diameter combined a Fourier transform infrared spectrometer monitor the concentration of analytes solutions by measuring changes absorbance their fundamental vibration peaks. A linear relationship observed between absorption vanescent field concentrations analytes. For this study low acetone, ethyl...
Phosphor-in-glass (PiG) color converters for LED applications were fabricated with a mixture of phosphors, Y₃Al₅O₁₂:Ce³⁺ (yellow) and CaAlSiN₃:Eu²⁺ (red). The low sintering temperature (550°C) SiO₂-Na₂O-RO (R=Ba, Zn) glass powder enabled the inclusion (red) phosphor which cannot be embedded conventional powders PiGs. By simply varying mixing ratio to phosphors as well yellow red facile control CIE chromaticity coordinates correlated following Planckian locus has been achieved. Phosphors...
Structural development of tellurite glasses with the addition Li 2 O and Na has been studied using infrared, Raman, X‐ray photoelectron spectroscopies. The increase in intensity peak at 755 cm −1 infrared spectra as compared to 620 suggests transformation TeO 4 building units 3 pyramids alkali oxide. Proposed structural change is further supported by strong compositional dependence 755‐cm Raman well formation a shoulder 1 s spectra. In contrast silicate glasses, nonbridging oxygens oxide not...
We have demonstrated that the population feeding from I11/24 level to 1.5 μm fluorescence emitting I13/24 of Er3+ ions in low phonon energy glass hosts can be enhanced by codoping with Ce3+ under optical pumping at 980 nm. The nonradiative transfer Er3+: 4I11/2; Ce3+: 2F5/2→Er3+: 4I13/2; 2F7/2, occurs form phonon-assisted transfer, and therefore rates are faster tellurite glasses, which a comparatively higher than sulfide glasses. cross-relaxation process for I13/24: 4I13/2→4I15/2: 4I9/2,...
Ni thin films were deposited by atomic layer deposition (ALD) using bis(dimethylamino-2-methyl-2-butoxo)nickel as a precursor and gas reactant. The growth characteristics film properties of ALD investigated. Low-resistivity on Si substrates, producing high-purity with small amount oxygen negligible amounts nitrogen carbon. Additionally, showed excellent conformality in nanoscale via holes. Utilizing this conformality, core/shell nanowires uniform diameters fabricated. By combining...
CdSe quantum dots (QDs) doped glasses have been widely investigated for optical filters, LED color converter and other emitters. Unlike QDs in solution, it is difficult to passivate the surface defects of glass matrix, which strongly suppress its intrinsic emission. In this study, passivation by Cd
A phosphor-in-glass (PiG) with red and green phosphors using Nd-doped glass as a host matrix was fabricated to produce white light emitting diode (wLED) wide color gamut. The Lu3Al5O12:Ce3+ CaAlSiN3:Eu2+ contents were adjusted achieve emission for liquid crystal display (LCD) applications. silicate doped varying concentrations of Nd2O3 modify the photoluminescence spectra wLED, by hypersensitive absorption Nd3+:I9/24→G5/24,G27/2 transition. coordination, rendering index, co-related...
This paper evaluates the efficacy of magnesium potassium phosphate cements (MKPCs) as waste forms for solidification radioactive concrete powder wastes produced by decommissioning nuclear power plants. MKPC specimens that contained up to 50 wt% simulated (SCPWs) were evaluated. We measured porosity and compressive strength specimens, observing them using scanning electron microscopy X-ray diffraction. The addition SCPWs reduced increased specimens. Struvite-K crystals well-synthesized, no...
1.6 μm emission originated from Pr3+: (3F3,3F4)→3H4 transition in Pr3+- and Pr3+/Er3+-doped selenide glasses were investigated under an optical pump of a conventional 1480 nm laser diode. The measured peak wavelength full width at half maximum the fluorescent ∼1650 >100 nm, respectively. A moderate lifetime thermally coupled upper manifolds (∼212±5 μs) together with high stimulated cross section ∼(3±1)×10−20 cm2 promises to be useful for band fiber-optic amplifier that can pumped...
A complete inorganic quantum dot color converter for a white LED is achieved using silicate-based quantum-dot-embedded glasses (QDEGs). The exhibits high CRI of 90 and highly improved thermal stability up to 200 °C, demonstrating its robustness practicality. CdSe/CdS core/shell structure within the silicate glass expected enhance colour converting efficiency.
Commercial Ce 3+ : YAG phosphors were embedded in glass frits. Thermal condition for the viscous sintering of composite materials was optimized. The phosphor–glass composites had maximum external efficiency 30% and light extraction 39%. Color temperatures composed fluorescent frits containing Eu Mn 2+ combined with blue LED s shifted from ~7000 to ~4000 K.