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CERTAIN INTEGRAL FORMULAS INVOLVING THE GENERALIZED K-BESSEL FUNCTIONS
Cho Myunghyun,Kim Yongsup 경남대학교 기초과학연구소 2019 Nonlinear Functional Analysis and Applications Vol.24 No.4
Motivated by Nisar et al. [10], by using MacRobert integral formula, we establish some integral formulas involving the generalized k-Bessel function $w_{k,nu,c,d}^{gamma, lambda}(z)$ of the first kind, which are expressed in terms of the generalized Wright (hypergeometric) functions. Some interesting special cases of our main results are also considered.
Moon, Jaehyun,Cho, Hyunsu,Maeng, Min-Jae,Choi, Kwangmin,Nguyen, Đ,ă,ng Thà,nh,Han, Jun-Han,Shin, Jin-Wook,Kwon, Byoung-Hwa,Lee, Jonghee,Cho, Seungmin,Lee, Jeong-Ik,Park, Yongsup,Lee, American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.31
<P>Modification of multilayer graphene films was investigated for a cathode of organic light-emitting diodes (OLEDs). By doping the graphene/electron transport layer (ETL) interface with Li, the driving voltage of the OLED was reduced dramatically from 24.5 to 3.2 V at a luminance of 1000 cd/m<SUP>2</SUP>. The external quantum efficiency was also enhanced from 3.4 to 12.9%. Surface analyses showed that the Li doping significantly lowers the lowest unoccupied molecular orbital level of the ETL, thereby reducing the electron injection barrier and facilitating electron injection from the cathode. Impedance spectroscopy analyses performed on electron-only devices (EODs) revealed the existence of distributed trap states with a well-defined activation energy, which is successfully described by the Havriliak-Negami capacitance functions and the temperature-independent frequency dispersion parameters. In particular, the graphene EOD showed a unique high-frequency feature as compared to the indium tin oxide one, which could be explained by an additional parallel capacitance element.</P> [FIG OMISSION]</BR>
Changhun Yun,Hyunsu Cho,Tae-Wook Koh,Ji-Hoon Kim,Jeong Won Kim,Yongsup Park,Seunghyup Yoo Institute of Electrical and Electronics Engineers 2012 IEEE transactions on electron devices Vol.59 No.1
<P>Inverted top-emitting organic light-emitting diodes (ITOLEDs) with high power efficiency and near-ideal emission characteristics are demonstrated by using the combination of the following: 1) an electron-injection layer composed of Cs<SUB>2</SUB>CO<SUB>3</SUB>, which lowers the turn-on voltage; 2) an electron-transporting layer with optimal electron mobility, which enhances the electron current and thus improves the carrier balance; and 3) a dielectric/metal/dielectric multilayer electrode that works as a damage-free top transparent anode optimized to achieve high efficiency and ideal emission characteristics. By this approach, ITOLEDs with power efficiency values of 3.8 and 30 lm W<SUP>-1</SUP> are demonstrated in fluorescent and phosphorescent types, respectively, at a luminance value of 1000 cd m<SUP>-2</SUP> with little distortion in spectral/angular characteristics.</P>
Magnetic properties of Mn-doped Bi<sub>2</sub>Te<sub>3</sub> and Sb<sub>2</sub>Te<sub>3</sub>
Choi, Jeongyong,Choi, Sungyoul,Choi, Jiyoun,Park, Yongsup,Park, Hyun-Min,Lee, Hee-Woong,Woo, Byung-Chul,Cho, Sunglae WILEY-VCH Verlag 2004 Physica status solidi. PSS. B, Basic solid state p Vol.241 No.7
<P>We have fabricated Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> single crystals by the vertical gradient solidification method. The compositions and crystal structures of Bi<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> and Sb<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> were determined using Electron Probe Micro-Analyzer (EPMA) and powder X-ray diffraction (XRD) patterns, respectively. Both crystal structures were rhombohedral with smaller lattice constants because of the smaller atomic radius of Mn than those of Bi and Sb. Based on the magnetization measurements, Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> compounds have ferromagnetic ordering at T<SUB>C</SUB> = 10 and 17 K, respectively. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Technical issues in graphene anode organic light emitting diodes
Moon, Jaehyun,Shin, Jin-Wook,Cho, Hyunsu,Han, Jun-Han,Cho, Nam Sung,Lim, Jong Tae,Park, Seung Koo,Choi, Hong Kyw,Choi, Sung-Yool,Kim, Ji-Hoon,Maeng, Min-Jae,Seo, Jaewon,Park, Yongsup,Lee, Jeong-Ik Elsevier 2015 Diamond and related materials Vol.57 No.-