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버퍼층과 음전극에 따른 유기 발광 소자의 전기적 특성과 발광 효율
정동회,김상걸,홍진웅,이준웅,김태완 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.5
We have studied electrical properties and luminous efficiency of organic light-emitting diodes(OLEDs) with different buffer layer and cathodes in a temperature range of 10 K and 300 K. Four different device structures were made. The OLEDs are based on the molecular compounds, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) as a hole transport, tris(8-hydroxyquinolinato) aluminum(III) (Alq$_3$) as an electron transport and omissive layer, and poly(3,4-ethylenedioxythiophene) :poly (styrenesulfonate) (PEDOT:PSS ) as a buffer layer. And LiAl was used as a cathode. Among the devices, the ITO/PEDOT:PSS/TPD/Alq$_3$/LiAl structure has a low energy-barrier height for charge injection and show a good luminous efficiency. We have got a highly efficient and low-voltage operating device using the conductive PEDOT:PSS and low work-function LiAl. From current-voltage characteristics with temperature variation, conduction mechanisms are explained SCLC (space charge limited current) and tunneling one. We have also studied energy barrier height and luminous efficiency at various temperature.
신남식,정동회,문유식,김용준 한국임상수의학회 1997 한국임상수의학회지 Vol.14 No.2
Artificial insemination with frozen canine semen using vaginal endoscope was performed in a two years old Golden Retriever to investigate the feasibility of this technique. The bitch was in her second estrus. Blood progesterone concentration was evaluated every two days to decide the timing of insemination since vaginal bleeding was observed. Insemination was performed twice in 48 hours interval on the fourth and sixth posterior to LH surge, respectively. The volume of frozen semen injected was 1.5 ml $(1{\times}10^{8}$ sperms/1ml of semen). The bitch was pregnant and she whelped a female pup on sixty one days after first insemination.
이성일,정동회 충주대학교 산업대학원 2002 大學院論文輯 Vol.3 No.-
Recently, electret applications have placed the focus on polymer thin film because electrical properties of a blend are studied. In this paper, we have measured the infra sonic frequency by using Electret Sensor. Electret is formed by appling the voltage range of -4[kV] to -8[kV] to PTFE film and the sensor is manufactured by moment method to detect the infra-sonic signal. Electret Infrasonic Transducer, which is designed and manufactured by using of the moment method according to the potential and electric field simulation, shows its promising result, since the average rising rate of sensitivity is 7.68 [dB/oct] under 1[㎐], and the average values are within ±1 [dB/oct]. As a result, it is believed that the characteristics of acquired transducer can be applied to the medical treatment, the industry, and the animal life researches, and also the study on noise elimination is required.