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Study of Nanostructured Polymeric Composites and Hybrid Layers Used for Light-Emitting Diodes
N. N. Dinh,L. H. Chi,T. T. C. Thuy,D. V. Thanh,T. P. Nguyen 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Nanocomposite polymeric thin lms of poly(2-methoxy-5-(2'-ethyl hexyloxy)phenylene vinylene) (MEH-PPV) with nano-crystalline titanium oxide (nc-TiO2) and polycarbazole (PVK) with cadmium selenide (CdSe) were fabricated by spin-coating. A 20-nm-thick nanocrystalline (molyb-denum oxide) MoO3 layer prepared by using thermal oxidation was also spin-coated with a PVK film. A study of photoluminescence (PL) spectra of the polymers and nanocomposites showed an enhancement in the photoluminescence from the nanocomposites. Moreover, MEH-PPV+nc-TiO2 composites exhibited a blue-shift of the PL spectrum as compared to that of the polymer film. The current-voltage characteristics of the Mo/nc-MoO3/PVK/Al-Au structures show that a semitransparent metallic coating or a transparent polymer can serve as a cathode in devices with enhanced charge carrier injection.
Highly dispersive transparency in coupled metamaterials
Thuy, V T T,Tung, N T,Park, J W,Lam, V D,Lee, Y P,Rhee, J Y IOP Publishing 2010 Journal of optics Vol.12 No.11
<P>We investigate the coupling between bright and quasi-dark eigenmodes in a planar metamaterial supporting highly dispersive transparency. The specific design of such a metamaterial consists of a cut wire (CW) and a single-gap split-ring resonator (SRR). Through the numerical simulation and the equivalent-circuit analysis, we demonstrate that the response of the SRR, which is weakly excited by external electric field, plays the role of a quasi-dark eigenmode in the presence of a strongly radiative CW. Furthermore, by extending and relating our study to the trapped mode resonances and the coupling between dark and bright modes, a more comprehensive perspective for the metamaterial realization of highly dispersive transmission and slow-light applications is provided.</P>
Synthesis and Optical Properties of ZnS Nanostructures
H. V. Chung,P. T. Huy,T. T. An,N. T. M. Thuy,N. D. Chien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Pure and transition-metal (Cu, Mn, Ag)-doped ZnS nanostructures were synthesized by using a thermal evaporation technique. By monitoring the experimental parameters such as deposition temperature, carrier-gas ux density and deposition time, we showed that ZnS nanostructures with different morphologies could be achieved, namely, nanobelts, nanowires and nanorods. A eld emission scanning electron microscopy (FE-SEM) study of the obtained ZnS nanowires reveals that their diameters ranged from 30 to hundreds of nanometers while their lengths ranged up to hundreds of micron. Room-temperature photoluminescence (PL) measurements showed a common peak around 517nm for all ZnS nanowires samples, while impurity-related emission bands were observed in doped ZnS nanowires. This result indicates the important role of dopants in controlling the emission color from ZnS nanostructures. Pure and transition-metal (Cu, Mn, Ag)-doped ZnS nanostructures were synthesized by using a thermal evaporation technique. By monitoring the experimental parameters such as deposition temperature, carrier-gas ux density and deposition time, we showed that ZnS nanostructures with different morphologies could be achieved, namely, nanobelts, nanowires and nanorods. A eld emission scanning electron microscopy (FE-SEM) study of the obtained ZnS nanowires reveals that their diameters ranged from 30 to hundreds of nanometers while their lengths ranged up to hundreds of micron. Room-temperature photoluminescence (PL) measurements showed a common peak around 517nm for all ZnS nanowires samples, while impurity-related emission bands were observed in doped ZnS nanowires. This result indicates the important role of dopants in controlling the emission color from ZnS nanostructures.