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Wu, Bo,Lee, Jin Gyun,Lim, Chang Ju,Jia, Shao Dong,Kwon, Sung Won,Hwang, Gwi Seo,Park, Jeong Hill WILEY‐VCH Verlag 2012 Helvetica chimica acta Vol.95 No.4
<P><B>Abstract</B></P><P>The four new sesquiterpenoids <B>1</B>–<B>4</B>, and the new 2‐(2‐phenylethyl)‐4<I>H</I>‐chromen‐4‐one (=2‐(2‐phenylethyl)‐4<I>H</I>‐1‐benzopyran‐4‐one) derivative <B>5</B>, together with the two known sesquiterpenoids <B>6</B> and <B>7</B>, the five known chromenones <B>8</B>–<B>12</B>, and 1‐hydroxy‐1,5‐diphenylpentan‐3‐one (<B>13</B>), were isolated from a 70% MeOH extract of <I>Aquilaria malaccensis</I> agarwood chips. Their structures were elucidated on the basis of comprehensive spectral analyses and comparison with literature data.</P>
Enhanced Performance of Solution‐Processed TESPE‐ADT Thin‐Film Transistors
Chen, Liang‐,Hsiang,Hu, Tarng‐,Shiang,Huang, Peng‐,Yi,Kim, Choongik,Yang, Ching‐,Hao,Wang, Juin‐,Jie,Yan, Jing‐,Yi,Ho, Jia‐,Chong,Lee, Cheng‐,Chung,Chen WILEY‐VCH Verlag 2013 Chemphyschem Vol.14 No.12
<P><B>Abstract</B></P><P>A solution‐processed anthradithiophene derivative, 5,11‐bis(4‐triethylsilylphenylethynyl)anthradithiophene (TESPE‐ADT), is studied for use as the semiconducting material in thin‐film transistors (TFTs). To enhance the electrical performance of the devices, two different kinds of solution processing (spin‐coating and drop‐casting) on various gate dielectrics as well as additional post‐treatment are employed on thin films of TESPE‐ADT, and <I>p</I>‐channel OTFT transport with hole mobilities as high as ∼0.12 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> are achieved. The film morphologies and formed microstructures of the semiconductor films are characterized in terms of film processing conditions and are correlated with variations in device performance.</P>
Yook, Kyoung Soo,Jeon, Soon Ok,Min, Sung‐,Yong,Lee, Jun Yeob,Yang, Ha‐,Jin,Noh, Taeyong,Kang, Sung‐,Kee,Lee, Tae‐,Woo WILEY‐VCH Verlag 2010 Advanced Functional Materials Vol.20 No.11
<P><B>Abstract</B></P><P>Cesium azide (CsN<SUB>3</SUB>) is employed as a novel n‐dopant because of its air stability and low deposition temperature. CsN<SUB>3</SUB> is easily co‐deposited with the electron transporting materials in an organic molecular beam deposition chamber so that it works well as an n‐dopant in the electron transport layer because its evaporation temperature is similar to that of common organic materials. The driving voltage of the p‐i‐n device with the CsN<SUB>3</SUB>‐doped n‐type layer and a MoO<SUB>3</SUB>‐doped p‐type layer is greatly reduced, and this device exhibits a very high power efficiency (57 lm W<SUP>−1</SUP>). Additionally, an n‐doping mechanism study reveals that CsN<SUB>3</SUB> was decomposed into Cs and N<SUB>2</SUB> during the evaporation. The charge injection mechanism was investigated using transient electroluminescence and capacitance–voltage measurements. A very highly efficient tandem organic light‐emitting diodes (OLED; 84 cd A<SUP>−1</SUP>) is also created using an n–p junction that is composed of the CsN<SUB>3</SUB>‐doped n‐type organic layer/MoO<SUB>3</SUB> p‐type inorganic layer as the interconnecting unit. This work demonstrates that an air‐stable and low‐temperature‐evaporable inorganic n‐dopant can very effectively enhance the device performance in p‐i‐n and tandem OLEDs, as well as simplify the material handling for the vacuum deposition process.</P>
Kim, Taejung,Song, Jung Ho,Jeong, Kyu Hyuk,Lee, Seokjoon,Ham, Jungyeob WILEY‐VCH Verlag 2013 European journal of organic chemistry Vol.19 No.-
<P>A novel series of 1,4-disubstituted 1,2,3-triazole-containing potassium trifluoroborates were prepared in good to excellent yields from the corresponding organohalides and potassium ethynyltrifluoroborate through a regioselective one-pot Cu-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. Further Suzuki-Miyaura cross-coupling of these (organo-1,2,3-triazol-4-yl)trifluoroborates with aryl and alkenyl bromides by using a PdCl2(dppf)center dot CH2Cl2/TBAB [dppf = 1,1-bis(diphenylphosphanyl)ferrocene, TBAB = tetrabutylammonium bromide] system under microwave irradiation was explored.</P>
Han, Tae‐,Hee,Choi, Mi‐,Ri,Woo, Seong‐,Hoon,Min, Sung‐,Yong,Lee, Chang‐,Lyoul,Lee, Tae‐,Woo WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.11
<P><B>A highly efficient simplified organic light‐emitting diode (OLED)</B> with a molecularly controlled strategy to form near‐perfect interfacial layer on top of the anode is demonstrated. A self‐organized polymeric hole injection layer (HIL) is exploited increasing hole injection, electron blocking, and reducing exciton quenching near the electrode or conducting polymers; this HIL allows simplified OLED comprised a single small‐molecule fluorescent layer to exhibits a high current efficiency (∼20 cd/A).</P>
Choi, Young‐,Eun,Yu, Ha‐,Nul,Yoon, Cheol‐,Hee,Bae, Yong‐,Soo WILEY‐VCH Verlag 2009 European journal of immunology Vol.39 No.3
<P><B>Abstract</B></P><P>In patients with cancer, DC express significantly lower amounts of MHC class II compared with those of normal individuals. However, the underlying mechanisms for this have not yet been fully defined. In the present study, we found that IL‐10 plays a major role in the tumor‐conditioned medium (TCM)‐mediated decrease of MHC class II expression on BM‐derived DC. IL‐10 inhibited the expression of type I CIITA during DC differentiation. GM‐CSF‐mediated histone (H3 and H4) acetylation at the type I promoter (<I>pI</I>) locus of the <I>CIITA</I> gene was markedly increased during DC differentiation and this increase was blocked by IL‐10. We also found that STAT5 bound to the <I>CIITA pI</I> locus during DC differentiation, and the binding was markedly attenuated by TCM or IL‐10. Altogether, these findings suggest that (i) the down‐regulation of MHC class II in tumor microenvironments is most likely attributable to IL‐10 in the TCM and (ii) IL‐10‐mediated MHC class II down‐regulation results from the inhibition of type I CIITA expression. This inhibition is most likely due to blocking of the STAT5‐associated epigenetic modifications of the <I>CIITA pI</I> locus during the entire period of DC differentiation from BM cells, as opposed to a simple inhibition of MHC class II expression at the DC stage.</P>
Baek, Youn‐,Kyoung,Yoo, Seung Min,Kang, Taejoon,Jeon, Hwan‐,Jin,Kim, Kyounghwan,Lee, Ji‐,Sun,Lee, Sang Yup,Kim, Bongsoo,Jung, Hee‐,Tae WILEY‐VCH Verlag 2010 Advanced functional materials Vol.20 No.24
<P><B>Abstract</B></P><P>A new strategy for fabricating highly ordered chitosan–Au core–shell nanopatterns with tunable surface plasmon resonance (SPR) properties is developed. This strategy combines fabrication of a chitosan nanopattern by using a soft‐nanoimprint technique with selective deposition of Au nanoparticles onto the patterned chitosan surface. The SPR response can be tuned by controlling the features of the resulting Au shell/polymer hybrid pattern, which makes these materials potentially useful in ultrasensitive optical sensors for molecular detection.</P>
In Situ Observation of Voltage‐Induced Multilevel Resistive Switching in Solid Electrolyte Memory
Choi, Sang‐,Jun,Park, Gyeong‐,Su,Kim, Ki‐,Hong,Cho, Soohaeng,Yang, Woo‐,Young,Li, Xiang‐,Shu,Moon, Jung‐,Hwan,Lee, Kyung‐,Jin,Kim, Kinam WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.29
<P><B>Solid electrolyte memories</B> utilizing voltage‐induced resistance change display the capability of multilevel switching, but understanding of the microscopic switching mechanism has been left incomplete. Here, in situ TEM observation of voltage‐induced changes in the microstructure of a solid electrolyte memory is reported, revealing that the multilevel switching originates from the growth of multiple conducting filaments with nanometer‐sized diameter and spacing. </P>
Lee, Jung‐,Hyun,Jeon, Hyeong‐,Tak,Kim, Yong‐,Joo,Lee, Kyung‐,Eun,Ok Jang, Young,Lee, Soon W. WILEY‐VCH Verlag 2011 European journal of inorganic chemistry Vol.2011 No.11
<P><B>Abstract</B></P><P>Novel heteroleptic Pd<SUP>0</SUP> complexes with an N‐heterocyclic carbene (NHC) ligand [(Me<SUB>3</SUB>P)Pd(NHC)] (NHC = IPr, <B>1</B>; SIPr, <B>2</B>) were obtained from [Pd(CH<SUB>2</SUB>=CHPh)(PMe<SUB>3</SUB>)<SUB>2</SUB>] and an equivalent of NHC [NHC = 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene (IPr) or 1,3‐bis(2,6‐diisopropylphenyl)‐4,5‐dihydroimidazol‐2‐ylidene (SIPr)]. Further treatments of complexes <B>1</B> and <B>2</B> with an additional equimolar NHCafforded the corresponding bis(NHC)–Pd<SUP>0</SUP> complexes [Pd(NHC)<SUB>2</SUB>] (NHC = IPr, <B>3</B>; SIPr, <B>4</B>). Complexes <B>1</B>–<B>4</B> readily reacted with dichloromethane or chloroform to give C–Cl oxidative addition products. In addition, the reactivity of complex <B>2</B> toward other organic halides such as bromobenzene, <I>trans</I>‐1,2‐dichloroethylene, and 5,5′‐dibromo‐2,2′‐bithiophene to produce the corresponding oxidative addition products was investigated. Finally, the ligand replacement of complex <B>1</B> with a chelating phosphane was examined.</P>
Yun, Jin‐,Mun,Yeo, Jun‐,Seok,Kim, Juhwan,Jeong, Hyung‐,Gu,Kim, Dong‐,Yu,Noh, Yong‐,Jin,Kim, Seok‐,Soon,Ku, Bon‐,Cheol,Na, Seok‐,In WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42
<P>Solution‐processable reduced graphene oxide as a hole‐transporting layer for highly efficient and stable organic solar cells is reported on page 4923 by Dong‐Yu Kim, Seok‐In Na, and co‐workers. Introduction of a newly reduced graphene oxide by simple solution processing into solar cells dramatically raises the cell efficiency and cell life‐time. The results will allow full use of chemically reduced graphene and will advance the realization of carbon‐based printable optoelectronic devices. </P>