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Lee, Keunsoo,Lee, Jonghee,Kim, Eunhye,Lee, Jeong-Ik,Cho, Doo-Hee,Lim, Jong Tae,Joo, Chul Woong,Kim, Joo Yeon,Yoo, Seunghyup,Ju, Byeong-Kwon,Moon, Jaehyun IOP 2016 Nanotechnology Vol.27 No.7
<P>An optical functional film applicable to various lighting devices is demonstrated in this study. The phase separation of two immiscible polymers in a common solvent was used to fabricate the film. In this paper, a self-organized lens-like structure is realized in this manner with optical OLED functional film. For an OLED, there are a few optical drawbacks, including light confinement or viewing angle distortion. By applying the optical film to an OLED, the angular spectra distortion resulting from the designed organic stack which produced the highest efficiency was successfully stabilized, simultaneously enhancing the efficiency of the OLED. We prove the effect of the film on the efficiency of OLEDs through an optical simulation. With the capability to overcome the main drawbacks of OLEDs, we contend that the proposed film can be applied to various lighting devices.</P>
Lee, Keunsoo,Shin, Jin-Wook,Park, Jun-Hwan,Lee, Jonghee,Joo, Chul Woong,Lee, Jeong-Ik,Cho, Doo-Hee,Lim, Jong Tae,Oh, Min-Cheol,Ju, Byeong-Kwon,Moon, Jaehyun American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.27
<P>We propose and fabricate a random light scattering layer for light extraction in organic light-emitting diodes (OLEDs) with silver nanodots, which were obtained by melting silver nanowires. The OLED with the light scattering layer as an internal light extraction structure was enhanced by 49.1% for the integrated external quantum efficiency (EQE). When a wrinkle structure is simultaneously used for an external light extraction structure, the total enhancement of the integrated EQE was 65.3%. The EQE is maximized to 65.3% at a current level of 2.0 mA/cm(2). By applying an internal light scattering layer and wrinkle structure to an OLED, the variance in the emission spectra was negligible over a broad viewing angle. Power mode analyses with finite difference time domain (FDTD) simulations revealed that the use of a scattering layer effectively reduced the waveguiding mode while introducing non-negligible absorption. Our method offers an effective yet simple approach to achieve both efficiency enhancement and spectral stability for a wide range of OLED applications.</P>
Kim, Keunsoo,Jeong, Jihoon,Azad, Abul K.,Jin, Sang Beom,Kim, Jung Hyun Elsevier 2016 APPLIED SURFACE SCIENCE - Vol.365 No.-
<P><B>Abstract</B></P> <P>Chemical states of lanthanide doped perovskite for direct reforming anode catalysts, Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> (Ln=La, Nd, and Sm) have been studied by X-ray Photoelectron Spectroscopy (XPS) in order to determine the effects of various lanthanide substitution in complex perovskites for high temperature-operating solid oxide fuel cells (HT-SOFC). The charge state of lanthanide ions remained at 3+ and the binding energies of the lanthanide ions in Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> were located in a relatively lower range compared to those of conventional lanthanide oxides. Mn and Ti were regarded as charge compensation components in Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB>; Mn was more influential than Ti. In the cases of substituting Nd and Sm into Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB>, some portion of Ti showed metallic behavior; the specific Mn satellite peak indicating an electro-catalytic effect had occurred. Three types of oxygen species comprised of lattice oxygen, carbonate species, and adsorbed oxygen species were observed in Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> from the O 1s spectra; a high portion of lattice oxygen was observed in both Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> (NSTM) and Sm<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> (SSTM). In various respects, NSTM and SSTM will be desirable reforming catalysts and anode candidates for high temperature solid oxide fuel cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chemical states of Ln<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> (Ln: La, Nd and Sm) were analyzed. </LI> <LI> Charge compensation occurred with the reduction of Mn and Ti. </LI> <LI> The Nd substitution effect allowed some Ti to convert into a metallic behavioral component. </LI> <LI> NSTM and SSTM had a large amount of lattice oxygen; however, LSTM retained a large quantity of adsorbed oxygen. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Measured Ti 2p peaks and deconvolution peaks of Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Ti<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3±d</SUB> under oxidizing condition (left) and NSTM under reducing condition (right).</P>
Lee, Dayoung,Jeong, Keunsoo,Luo, Xiao,Kim, Gayoung,Yang, Youjun,Chen, Xiaoqiang,Kim, Sehoon,Yoon, Juyoung The Royal Society of Chemistry 2018 Journal of Materials Chemistry B Vol.6 No.17
<P>Two new cyanine-based fluorescent probes 1 and 2 have been developed. Probe 1 bears two cyanine units in a single molecule, and probe 2 contains a bis(trifluoromethyl)benzenethiol moiety. Both are non-fluorescent. The addition of intracellular glutathione (GSH) significantly enhanced the NIR fluorescence of the two probes. Both probes were used to image varying amounts of GSH in living cells. In tumor bearing mice, the <I>in vivo</I> fluorescence intensity of both probes was higher in tumors, where GSH is overexpressed, than in normal tissues. These results suggest that these new fluorogenic probes have potential for GSH-targeting diagnostic imaging.</P>
RNA Editing Enzyme ADAR1 Suppresses the Mobility of Cancer Cells via ARPIN
Min Ji Park,Eunji Jeong,Eun Ji Lee,Hyeon Ji Choi,Bo Hyun Moon,Keunsoo Kang,Suhwan Chang Korean Society for Molecular and Cellular Biology 2023 Molecules and cells Vol.46 No.6
Deamination of adenine or cytosine in RNA, called RNA editing, is a constitutively active and common modification. The primary role of RNA editing is tagging RNA right after its synthesis so that the endogenous RNA is recognized as self and distinguished from exogenous RNA, such as viral RNA. In addition to this primary function, the direct or indirect effects on gene expression can be utilized in cancer where a high level of RNA editing activity persists. This report identified actin-related protein 2/3 complex inhibitor (ARPIN) as a target of ADAR1 in breast cancer cells. Our comparative RNA sequencing analysis in MCF7 cells revealed that the expression of ARPIN was decreased upon ADAR1 depletion with altered editing on its 3'UTR. However, the expression changes of ARPIN were not dependent on 3'UTR editing but relied on three microRNAs acting on ARPIN. As a result, we found that the migration and invasion of cancer cells were profoundly increased by ADAR1 depletion, and this cellular phenotype was reversed by the exogenous ARPIN expression. Altogether, our data suggest that ADAR1 suppresses breast cancer cell mobility via the upregulation of ARPIN.