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Bipolar Host Materials for Green Triplet Emitter in Organic Light-emitting Diodes
Jeon, Ji Young,Park, Tae Jin,Jeon, Woo Sik,Park, Jung Joo,Jang, Jin,Kwon, Jang Hyuk,Lee, Jae Yeol The Chemical Society of Japan 2007 Chemistry letters Vol.36 No.9
<P>We have developed novel bipolar host materials for high efficiency green phosphorescent OLEDs (PHOLEDs). Phenyl moieties were inserted in a 9,9′-(biphenyl-4,4′-diyl)dicarbazole (CBP) compound to provide much easier electron injection and to increase electron mobility. The efficiency increase and voltage reduction by this modification were observed in green PHOLEDs. At a given constant luminance of 1000 cd/m<SUP>2</SUP>, the power efficiency was enhanced about twenty percent in the general green PHOLED devices.</P>
Jeon, Jae-Sik,Kim, Jong Wan,Kim, Jae Kyung The Korean Society for Microbiology and Biotechnol 2018 한국미생물·생명공학회지 Vol.46 No.2
Human papillomavirus (HPV) plays a critical role in the development of cervical carcinoma. This study analyzed the efficiency of multiplex real-time PCR in detecting and identifying HPV genotypes in samples from women who visited a Korean hospital for checkups. Cervical swab specimens were obtained from women who attended a checkup at the Health Improvement Center of Hospital in Dankook University Cheonan, South Korea and were referred for an HPV genotyping test between January and September 2014. A total of 1703 cervical swab specimens were collected consecutively during this period. PCR results were compared with those of the traditional cytological assay for the same population. Among the 1,703 specimens, 19.91% were HPV positive, of which 14.50% indicated a single infection and 5.40% indicated multiple infections. However, cytology identified only 2.52% of positive cases, including 1.23% cases of atypical squamous cells of undetermined significance, 1% of low grade squamous intra-epithelial lesion, and 0.29% of high grade squamous intra-epithelial lesion. The rate of high-risk and low-risk HPV in the abnormal cytology group was 48 and 23, respectively, and 274 and 136 in the normal group, respectively. HPV types 56, 52, 43 were the most prevalent in that order. Our results confirm the efficiency of the HPV DNA assay for the detection of 28 different HPV genotypes with reasonable sensitivity. A screening strategy that comprises the HPV DNA assay and cytology would help overcome the low sensitivity of a cytological diagnosis.
Controlled Growth of Iron Oxide Nanoparticles in the Aqueous Microdroplets
Jeon, Bong-Sik,Lee, Seung-Jun,Kim, Jong-Duk American Scientific Publishers 2008 Journal of nanoscience and nanotechnology Vol.8 No.9
<P>Magnetite nanoparticles were synthesized by chemical coprecipitation of ferric and ferrous aqueous solutions via regulation of the microenvironment at ambient conditions. Nanocrystals having an average diameter of 6 to 12 nm were obtained by picoliter droplets, whereas only 9 nm diameter nanocrystals were prepared by microliter droplets. The size of the nanocrystals was controlled by a precise balance of reactions of hydroxide ions with positive ions at the surface layer and inner layers of the droplets. The crystal structure and average size were analyzed by X-ray diffraction pattern and transmission electron microscope images. The field dependence and temperature dependence on magnetization measured by a superconducting quantum interference device demonstrate that the as-synthesized particles are superparamagnetic at room temperature and have a size-dependent magnetic property. The anisotropy constant calculated by the blocking temperature and particle size was found to decrease with increasing particle size.</P>
Highly Efficient Red Phosphorescent OLEDs with Simple Device Structure
Jeon, Woo Sik,Park, Tae Jin,Kwon, Jang Hyuk TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.513 No.1
<P> We report high efficiency red phosphorescent OLEDs with a simple organic bi-layered structure. A host material bis(10-hydroxybenzo[h] quinolinato)beryllium complex (Bebq2) having a good electron transporting and energy transfer characteristics and a good hole injection and transport material N,N'-di(4-(N,N'-diphenyl-amino)phenyl)-N,N'-diphenylbenzidine (DNTPD) lead to the fabrication of simplified high efficiency device. The driving voltage value of 3.5 V to reach luminance of 1000 cd/m2 is reported. The maximum current- and power-efficiency values of 9.38 cd/A and 11.72 lm/W with real true red color of (0.67, 0.32) are demonstrated.</P>
Physics-Based SPICE Model of a-InGaZnO Thin-Film Transistor Using Verilog-A
Jeon, Yong-Woo,Hur, In-Seok,Kim, Yong-Sik,Bae, Min-Kyung,Jung, Hyun-Kwang,Kong, Dong-Sik,Kim, Woo-Joon,Kim, Jae-Hyeong,Jang, Jae-Man,Kim, Dong-Myong,Kim, Dae-Hwan The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.3
In this work, we report the physics-based SPICE model of amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) and demonstrate the SPICE simulation of amorphous InGaZnO (a-IGZO) TFT inverter by using Verilog-A. As key physical parameter, subgap density-of-states (DOS) is extracted and used for calculating the electric potential, carrier density, and mobility along the depth direction of active thin-film. It is confirmed that the proposed DOS-based SPICE model can successfully reproduce the voltage transfer characteristic of a-IGZO inverter as well as the measured I-V characteristics of a-IGZO TFTs within the average error of 6% at $V_{DD}$=20 V.
Controlled aggregates of magnetite nanoparticles for highly sensitive MR contrast agent.
Jeon, Bong-Sik,Cho, Eun-Jin,Yang, Hee-Man,Suh, Jin-Suck,Huh, Yong-Min,Kim, Jong-Duk American Scientific Publishers 2009 Journal of nanoscience and nanotechnology Vol.9 No.12
<P>We have prepared a magnetite encapsulated polymer nanocomposite (MEPN) by an emulsification-diffusion technique and found that the encapsulation efficiency could be precisely controlled according to the portion of magnetite and the capping ligand that covers the surface of the magnetite nanoparticles. The field-dependence and temperature dependence on magnetization, measured by a superconducting quantum interference device, demonstrate that there was no size effect of the magnetite nanoparticles on the encapsulation behavior. The size distribution and T2 relaxivity of prepared MEPNs were measured using magnetic resonance imaging for analysis of the effect of aggregation and it was verified that aggregates of the magnetite nanoparticles provide enhanced relaxation ability.</P>
Jeon, Young-Ki,Kim, Tae-Jin,Lee, Jea-Young,Choi, Jae-Sik,Jeon, Chang-Jin Lippincott Williams Wilkins, Inc. 2007 NEUROREPORT - Vol.18 No.11
The purpose of this investigation is to characterize parvalbumin-immunoreactive (PV-IR) amacrine cells in bat retina through immunocytochemistry, quantitative analysis, and confocal microscopy. PV immunoreactivity was present in ganglion cell and inner nuclear layers. The regular distribution of PV-IR neurons, the inner marginal locations of their cell bodies in the inner nuclear layers, and the distinctive bilaminar morphologies of their dendritic arbors in the inner plexiform layers suggested that these PV-IR cells were AII amacrine cells. PV-IR neurons were double labeled forcalretinin, a marker for AII cells. These results indicate that PV antibodies can be used to label AII cells selectively in bats. The existence of AII cells suggests that bats have retinas involved in both rod-driven and cone-driven signals.
Highly Efficient Simple-Structure Red Phosphorescent OLEDs with an Extremely Low Doping Technology
Jeon, Woo-Sik,Park, Tae-Jin,Kwon, Jang-Hyuk The Korean Infomation Display Society 2009 Journal of information display Vol.10 No.2
Highly efficient red phosphorescent OLEDs (PHOLEDs) with a simple, organic, triple-layer structure was developed using the narrow-bandgap fluorescent host material bis(10-hydroxybenzo[h] quinolinato)beryllium complex (Bebq2) and the deep-red dopant tris(1-phenylisoquinoline)iridium (Ir(piq)3). The maximum current and power efficiency values of 12.71 cd/A and 16.02 lm/W, respectively, with an extremely low doping technology of 1%, are demonstrated herein. The results reveal a practical, cost-saving host dopant system for the fabrication of highly efficient PHOLEDs involving the simple structure presented herein, with a reduction of expensive Ir dopants.