A5022338905- Luminescence Properties of Advanced Materials
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Multiferroics and related materials
- Radiation Detection and Scintillator Technologies
- Glass properties and applications
- Advanced Photocatalysis Techniques
- Solid-state spectroscopy and crystallography
- Inorganic Fluorides and Related Compounds
- Ga2O3 and related materials
- Acoustic Wave Resonator Technologies
- Nuclear materials and radiation effects
- Luminescence and Fluorescent Materials
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Ammonia Synthesis and Nitrogen Reduction
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- Lanthanide and Transition Metal Complexes
- Transition Metal Oxide Nanomaterials
- Catalytic Processes in Materials Science
Pukyong National University
2014-2023
Busan Medical Center
2017-2019
Government of the Republic of Korea
2019
Changchun Normal University
2010
Pusan National University
1992-2010
Silla University
2007
Dong-Eui University
2007
Korea University
1995
Abstract Herein, the self‐reduction behavior of manganese (Mn) in Mg 2 SnO 4 (MSO) host lattices prepared by using solid‐state reaction technique air atmosphere is reported. Excited 282 nm, only emission Mn 2+ seen, and observed results are confirmed theoretical calculation based on density functional theory. Noteworthy, with codoping Li + , process suppressed, leading to coexistence 4+ MSO along multicolor emissions. For suppressed behavior, possible hypotheses proposed elucidate...
Lu6WO12 and Lu6MoO12 doped with Eu3+ ions have been prepared by using a citrate complexation route, followed calcination at different temperatures. The morphology, structure, optical photoluminescence properties of the compounds were studied as function temperature. Both compositions undergo transitions from cubic to hexagonal phase when temperature increases. All strong absorption near-UV light show intense red luminescence under excitation, which is related transfer energy host lattices...
RE3+ (RE3+ = Ce3+, Tb3+) doped and undoped KGdF4 nanocrystals have been synthesized by a citric acid assisted hydrothermal method. The crystallize in cubic phase with spherical morphology an average diameter of 100 nm. optical properties Ce3+ and/or Tb3+ were characterized. results reveal that the existence (sensitizer) can dramatically enhance photoluminescence emission intensity (activator) co-doped samples due to efficient energy transfer from Tb3+. efficiency Ce3+–Tb3+ was evaluated....
Charge transfer (CT) energy from the ligand to central ions is an important factor in luminescence properties for rare earth doped inorganic phosphors. The dielectric theory of complex crystals was used calculate chemical bond properties. Combining photoluminescence and crystals, CT bands O2−–Eu3+, O2−–Mo6+ O2−–W6+ Eu3+-doped phosphors have been investigated experimentally theoretically. Taking Ln3M5O12 (Ln = Y, Lu M Al, Ga), Gd3Ga5O12, MMoO4 (M Ca, Sr, Ba) MWO4 as typical phosphors, we...
Novel host‐sensitized Y 6 WO 12 : x Dy 3+ (0.01 ≤ 0.20) phosphors were synthesized via solid‐state reaction process. X‐ray diffraction analysis confirmed the phase formation of materials. The photoluminescence excitation and emission spectra, concentration effect, thermal‐quenching, decay properties investigated. phosphor could be excited by UV light region from 300 to 400 nm, it exhibited blue (478 nm) yellow (568 corresponding 4 F 9/2 – H 15/2 transitions 13/2 transitions, respectively....
Bi-excess SrBi2Ta2O9 (SBT) thin films on Pt/Ti/SiO2/Si substrate were prepared by pulsed laser deposition technique. The SBT structure was characterized x-ray diffraction studies. ferroelectric properties confirmed P–E hysteresis loops at different applied electric fields. dielectric constant and the ac conductivity of Pt/SBT/Pt capacitor investigated in frequency range from 0.01 Hz to 100 kHz temperature 25 400 °C. thermal activation energy 0.90 eV is observed dependent constant. for...
A series of Eu3+ ion-activated Y6WxMo(1 − x)O12 polycrystalline powders were synthesized using a solid-state reaction. The crystal structure, ultraviolet-visible and photoluminescence spectra these compounds characterized. structural parameters, electronic structure orbital population Y6WO12 Y6MoO12 determined by means density functional theory calculation. calculated parameters agreed well with the experimental values. Both structures indicated that band-gap is larger than Y6MoO12. WO6 or...
Y6(WMo)(0.5)O12 activated with Eu(3+) ions was investigated as a red-emitting conversion phosphor for white light emitting diodes (WLEDs). The phosphors were synthesized by calcining citrate-complexation precursor at different temperatures. photoluminescence properties of the and energy transfer mechanisms involved studied function structure evolution. It found that host lattices crystallized in cubic or hexagonal phase depending on synthesis conditions. Although all showed intensive red...