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Dive into the research topics where Seuk Joo Rhee is active.

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Featured researches published by Seuk Joo Rhee.


Nanoscale Research Letters | 2014

Tunable blue-green-emitting wurtzite ZnS:Mg nanosheet-assembled hierarchical spheres for near-UV white LEDs

Devulapalli Amaranatha Reddy; Deok Hyeon Kim; Seuk Joo Rhee; Bo Wha Lee; Chunli Liu

Mg-doped ZnS hierarchical spheres have been synthesized via hydrothermal method using mixed solvents of ethylenediamine and DI water without any surface-active agent. The surface morphology and microstructure studies revealed that the hierarchical spheres were consisted of many well-aligned nanosheets with width 10 nm and length about 50 ~ 100 nm. X-Ray diffraction results show that the ZnS:Mg hierarchical spheres have wurtzite structure with high crystallinity. The absorption edge in the diffuse reflection spectra shifts towards lower wavelength with increasing Mg concentration, indicating an expansion in the bandgap energy that is estimated to be in the range of 3.28 to 3.47 eV. Blue-green photoluminescence with tunable intensity and peak position was observed depending on the Mg content. The Mg2+-activated ZnS phosphor can be good candidates for blue-green components in near-UV white light-emitting diodes.


Journal of Applied Physics | 2001

Excimer laser annealing of Er-implanted GaN

Seuk Joo Rhee; Sangsig Kim; Christopher W. Sterner; J. O. White; S. G. Bishop

Thin films of Er-implanted GaN are annealed with pulses of 31 ns duration from a KrF excimer laser. The degree of annealing is evaluated by measuring the Er photoluminescence at 1540 nm. The implantation dose is 4×1013–4×1015 cm−2. The laser fluence is 0.15–0.88 J/cm2. The number of laser pulses is 102–5×104. A total heating time on the order of 1 ms is long enough to produce good structural reordering, and short enough to avoid decomposition. The results are compared with a numerical simulation of the heating as a function of time and depth in the sample.


RSC Advances | 2016

One-pot solvothermal synthesis of magnetic SnFe2O4 nanoparticles and their performance in the photocatalytic degradation of chlortetracycline with visible light radiation

Yuefa Jia; Deokhyeon Kim; Taehyoung Lee; Seokwon Kang; B. W. Lee; Seuk Joo Rhee; Chunli Liu

Highly crystalline SnFe2O4 nanoparticles with high saturation magnetization and superior chlortetracycline (CTC) degradation efficiency was developed using a one-pot solvothermal method. The SnFe2O4 nanoparticles about 50 nm were prepared with a simple and cost-effective process performed at 200 °C. Superparamagnetism was observed from the SnFe2O4 nanoparticles with a high saturation magnetization of 74.3 emu g−1. The excellent photocatalytic activity of the SnFe2O4 nanoparticles was demonstrated through the high degradation efficiency of CTC under a visible light/SnFe2O4/9 mM H2O2 process. The effective degradation of CTC with the SnFe2O4 nanoparticles was attributed to the effective absorption of the visible light and the good separation ability of the electron–hole pairs. The synergy effect between SnFe2O4 and H2O2 was analysed, and the optimum initial concentration of H2O2 was determined to be 9 mM to achieve the best photocatalytic result on CTC. The SnFe2O4 nanoparticles also exhibited a fast and easy magnetic retrieval and a stable performance with continuous recycled usage.


ACS Applied Materials & Interfaces | 2011

Brush-shaped ZnO heteronanorods synthesized using thermal-assisted pulsed laser deposition.

Jaewan Choi; Hyunjin Ji; Octolia Togibasa Tambunan; In Sung Hwang; Hyung Sik Woo; Jong Heun Lee; B. W. Lee; Chunli Liu; Seuk Joo Rhee; Chang Uk Jung; Gyu Tae Kim

Brush-shaped ZnO heteronanostructures were synthesized using a newly designed thermal-assisted pulsed laser deposition (T-PLD) system that combines the advantages of pulsed laser deposition (PLD) and a hot furnace system. Branched ZnO nanostructures were successfully grown onto CVD-grown backbone nanowires by T-PLD. Although ZnO growth at 300 °C resulted in core-shell structures, brush-shaped hierarchical nanostructures were formed at 500-600 °C. Materials properties were studied via photoluminescence (PL), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations. The enhanced photocurrent of a SnO(2)-ZnO heterostructures device by irradiation with 365 nm wavelength ultraviolet (UV) light was also investigated by the current-voltage characteristics.


Physical Review B | 2016

Disorder-driven topological phase transition in Bi2Se3 films

Matthew Brahlek; Nikesh Koirala; Maryam Salehi; Jisoo Moon; Wenhan Zhang; Haoxiang Li; Xiaoqing Zhou; Myung-Geun Han; Liang Wu; Thomas J. Emge; Hang-Dong Lee; Can Xu; Seuk Joo Rhee; T. Gustafsson; N. Peter Armitage; Yimei Zhu; D. S. Dessau; Weida Wu; Seongshik Oh

Topological insulators (TI) are a phase of matter that host unusual metallic states on their surfaces. Unlike the states that exist on the surface of conventional materials, these so-called topological surfaces states (TSS) are protected against disorder-related localization effects by time reversal symmetry through strong spin-orbit coupling. By combining transport measurements, angle-resolved photo-emission spectroscopy and scanning tunneling microscopy, we show that there exists a critical level of disorder beyond which the TI Bi2Se3 loses its ability to protect the metallic TSS and transitions to a fully insulating state. The absence of the metallic surface channels dictates that there is a change in material’s topological character, implying that disorder can lead to a topological phase transition even without breaking the time reversal symmetry. This observation challenges the conventional notion of topologically-protected surface states, and will provoke new studies as to the fundamental nature of topological phase of matter in the presence of disorder.


Journal of The Optical Society of Korea | 2013

Photoluminescence Study on O-plasma Treated ZnO Thin Films

Jaewon Cho; Jinsung Choi; SeGi Yu; Seuk Joo Rhee

A temperature dependent (10K-290K) photoluminescence (PL) study for two differently prepared ZnO thin films (as-grown and O-plasma treated) is presented. Four characteristic peaks were identified for both samples: (i) neutral donor-bound excitons (


Journal of The Korean Institute of Electrical and Electronic Material Engineers | 2011

PL Study on the Oxygen-Plasma-Treated ZnO Thin Film

Jaewon Cho; Seuk Joo Rhee

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Journal of The Korean Institute of Electrical and Electronic Material Engineers | 2011

Effects of the Plasma Treatment on the Physical Property of ZnO Thin Film

Jaewon Cho; Tae-Young Joung; Seuk Joo Rhee

), (ii) two electron satellites (TES), (iii) phonon replica of


Journal of Alloys and Compounds | 2014

Hydrothermal synthesis of wurtzite Zn1−xNixS mesoporous nanospheres: With blue–green emissions and ferromagnetic Curie point above room temperature

D. Amaranatha Reddy; D.H. Kim; Seuk Joo Rhee; Chang Uk Jung; B.W. Lee; Chunli Liu

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Materials Letters | 2008

Vertically aligned Fe-doped ZnO nanorod arrays by ultrasonic irradiation and their photoluminescence properties

Eugene Oh; Seung-Ho Jung; Kun-Hong Lee; Soo-Hwan Jeong; SeGi Yu; Seuk Joo Rhee

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Dive into the Seuk Joo Rhee's collaboration.

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Chunli Liu

Hankuk University of Foreign Studies

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Chang Uk Jung

Hankuk University of Foreign Studies

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Yuefa Jia

Hankuk University of Foreign Studies

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B. W. Lee

Hankuk University of Foreign Studies

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B.W. Lee

Hankuk University of Foreign Studies

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Deokhyeon Kim

Hankuk University of Foreign Studies

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Octolia Togibasa Tambunan

Hankuk University of Foreign Studies

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SeGi Yu

Hankuk University of Foreign Studies

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Bo Wha Lee

Hankuk University of Foreign Studies

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