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- 저자 : 곽태호(Tea-Ho Kwak) (검색결과 4 건)
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MoO<SUB>x</SUB>를 사용한 청색 형광 Tandem OLED의 발광 특성
곽태호(Tea-Ho Kwak),주성후(Sung-Hoo Ju) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.3
To improve emission efficiency of organic light emitting devices (OLEDs), we fabricated the tandem OLED of ITO / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al / MoOx (X nm) / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al structure. And emission properties of single OLED and tandem OLED with MoOx thickness as charge generation layer (CGL) were measured. The current emission efficiency and quantum efficiency of tandem OLED with MoOx of 3 nm thickness were improved compare with single OLED from 7.46 cd/A and 5.39% to 22.57 cd/A and 11.76%, respectively. In case of thicker or thinner than MoOx of 3~5 nm, the current emission efficiency and quantum efficiency were decreased, because balance of electron and hole in emission layer was not matching. The driving voltage was increased from 8 V of single OLED to 15 V of tandem OLED by thickness increase of OLED. As a result, it was possible to improve the emission efficiency of OLEDs by optimized MoOx thickness.
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CGL의 재료에 따른 청색 형광 Tandem OLED의 발광 특성
곽태호(Tea-Ho Kwak),주성후(Sung-Hoo Ju) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.4
We investigated emission characteristics of tandem organic light emitting devices (OLEDs) with p-type materials as charge generation layer. The tandem OLEDs were fabricated by using MoOx, WOx, C60 and HATCN as p-type material or not using p-type material for charge generation. When HATCN was used as p-type material, it showed high current density at low applied voltage, but increase of efficiency was small because of charge unbalance in emitting layer. In case of tandem OLED not using p-type material, applied voltage increased remarkably because of difficulty of hole injection. In case of MoOx, WOx or C60 as ptype material, current emission efficiency increased greatly. In particular, current emission efficiency of tandem OLED using MoOx as p-type material increased up to 3 times than current emission efficiency of single OLED. The Commission Internationale de l’Eclairage (CIE) 1931 color coordinates were changed by overlapping of 504 nm emission wavelength. As a result, emission efficiency of tandem OLED improved compared with single OLED, but driving voltage also increased by increase of organic layer thickness.
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최원호(Choi won-ho),곽태호(Tea-Ho Kwak),김구식(Kim ku-sik) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Current freight electric locomotives (132 ton) of the eco-friendly and can carry large cargo logistics as a means of generation has increased the demand at home and abroad. Especially Freight electric locomotives to increase the traction it is easy to mass and rapid transport. In addition Freight electric locomotives is no exhaust and low noise compared to diesel –electric locomotives and it can be eco-friendly transportation. CO_CO BOGIE of Freight electric locomotives has no the center pivot and Traction_Rod and Spring of CO_CO BOGIE is mounted on the body. These freight electric locomotives to be satisfied with the safety regulations. Carbody development satisfied Implementation of optimum body and collision is the focus. Accordingly the different approach in the upper and lower carbody structure and interior and equipment placement is needed. On this paper the contents give explanation of cases on carbody design composed of freight electric locomotives now developed and process of improvement by structure analysis and collision analysis.
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최윤석(Yun-Suk Choi),곽태호(Tea-Ho Kwak),김구식(Ku-Sik Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In recent carbody design of rolling stocks the development of a new carbody structure rather than designing the carbody structure by applying a proven new way to design the carbody structure has been applied. Structural requirements of the carbody being equal the same applies to the carbody structure means that it is possible to design a carbody structure. By kinematic envelope & speed and the environment etc. the carbody design is in progress. Accordingly if all conditions are the same as the existing carbody structure by the same criteria is that you can go get the same. Rather than developing a new carbody structure carbody structure by applying proven that safety is secured is made possible. Proven standard model of the carbody structure of rolling stocks to secure a new carbody design has made it possible to apply. In addition the size of the different carbody but structural requirements are the same body design is easier to be expected. In this paper a model standard carbody of rolling stocks is chosen and of a new carbody design that can be applied to the carbody design will attempt to demonstrate the case.
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