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ITO 표면 처리와 음전극 변화에 따른 OLEDs의 특성 연구
김두석,장윤기,권영수,Kim, Doo-Seok,Jang, Yoon-Ki,Kwon, Young-Soo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.12
In this study, we report an improved efficiency of Organic light emitting diodes(OLEDs), using $UV/O_3$ treated anode and different cathode. We investigated the efficiency of OLEDs by $UV/O_3$ treatment of ITO surface. We Performed $UV/O_3$ treatment and found that $UV/O_3$ treatment enhanced the performance of OLEDs. The fundamental structure of the OLEDs was ITO $anode/{\alpha}-NPD/Alq_3/Al$ or Li:Al cathode. The Li:Al can improve the OLEDs efficiency dramatically in cathode because it has lower work function than Al. Current-voltage, Luminance-voltage characteristics and luminance efficiency were measured at room temperature.
유다와 다말의 동침 사건 및 사마리아 여인의 다섯 남편에 관한 이해
김두석(Doo Seok Kim) 개혁신학회 2009 개혁논총 Vol.10 No.-
There are many different understandings in interpreting the Holy Scripture. the synchronic method, a new method of biblical interpretation, is attempted in a recently trend of pentateuch research. this synchronic method meets with intention of history back ground and the writer of main text relationship with main text with the individual without and from the interpret a main text it searches meaning. also the synchronic method originates to three elements, rhetorical criticism, structural criticism and narrative criticism. but this method is different from traditional reformed biblical interpretation it is only another method in biblical criticism. For example Juda in chapter thirty-eight of genesis is wears out under bible interpret of synchronic method. but Juda accomplishes covenant of God levirate marriage under method of reformed biblical interpretation. a understanding of genesis thirty-eight under of correct exegesis about levirate marriage in deuteronomy twenty-five. the term of LEVIRATE in levirate marriage from the law-latin term LEVIR a husband's brother, the name applied to an ancient usage of the hebrews, reordained by Moses(Gen. 38: Deut. 25:5-10) the levirate marriage requires when an israelite died without leaving male issue his brother with him was compelled to marry to widow and continue his deceased brother's family through the first-born son issuing from such as the heir of the former husband. if the second also died without progeny she could ask the third and so on the object of this levirate marriage is to raise up seed to the departed brother. we are told this levirate marriage in genesis thirty-eight Er, Judah's eldest son who was married to Tamar died without son. the second son, Onan was called upon to marry his deceased brother's widow an that time when he again died leaving no children Tamar the widow has still a claim up on the only surviving son Shelah for whom she had to wait as he was not as yet marriageable. but judah, father-in-law, did not give Shelah as her husband to Tamar daughter-in-law. Ultimately Juda himself had to marry his daughter-in-law, Tamar. Juda was father of Perez whose mother was Tamar Perez was in a record of the genealogy of Jesus christ(matt. 1: 3). Also we can think that The five husbands of Samaritan woman was Levir, Goel. The men of Samarian woman have to marriage with her(John 4:1-26).
Zn(HPB)<sub>2</sub>를 Hole Blocking Layer로 이용한 OLEDS의 특성 연구
김동은,김두석,이범종,권영수,Kim, Dong-Eun,Kim, Doo-Seok,Lee, Burm-Jong,Kwon, Young-Soo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.12
Recently, organic light emitting diodes(OLEDs) is widely used as one of the information display techniques. We synthesized 2-(2-hydroxyphenyl)benzoxazole($Zn(HPB)_2$). We studied the luminescent properties of OLEDs using $Zn(HPB)_2$. The ionization potential(IP) and the electron affinity(EA) of $Zn(HPB)_2$ investigated using cyclic-voltammetry(C-V). The IP and EA were 6.5 eV and 3.0 eV, respectively. The PL and EL spectra of $Zn(HPB)_2$ were observed at the wavelength of 450 nm. We used $Zn(HPB)_2$ as an emitting layer and hole blocking layer. At the experiment about hole blocking effect, we inserted $Zn(HPB)_2$ between emiting material layer(EML) and cathode, and between hole transport layer(HTL) and emitting material layer(EML). We measured current density-voltage and luminance-voltage characteristics at room temperature.
Properties of color purity as white OLED based on Zn(HPB)₂ as blue emitting layer
김동은(Dong-Eun Kim),김병상(Byoung-Sang Kim),김두석(Doo-Seok Kim),이범종(Burm-Jong Lee),권영수(Young-Soo Kwon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
We synthesized emissive materials, namely Zn(HPB)₂. The fundamental structures of the OLEDs were ITO / NPB (40 ㎚) Zn(HPB)₂ (40 ㎚) / Alq₃:DCJTB (20, 30, or 40 ㎚) / LiF / Al. We varied the thickness of Alq₃:DCJTB from 20 ㎚ to 40㎚. We measured current density-voltage and luminance-voltage characteristics at room temperature. When the thickness of the Alq₃:DCJTB layer was 40 ㎚, white emission is achieved. The CIE coordinates are (0.32, 0.33) at an applied voltage of 14V.