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3층 구조를 사용한 유기 EL 디바이스의 발광 특성 변화
表相佑,金正洙 弘益大學校 科學基術硏究所 1999 科學技術硏究論文集 Vol.10 No.2
Electroluminescent (EL) devices based on organic materials have been of great interest due to their possible applications for large-area flat-panel displays. They are attractive because of their capability of multicolor emission, and low operation voltage. The fluorescent properties of lanthanide chelate complexes have been known long, especially since these materials have been used as active medium in dye lasers. Electroluminescent materials for the whole visible spectrum have been found and brightness as well as device performance are sufficient for most potential application. One of the problems still remaining are to obtain narrow emission bands at the three primary colors red, green, and blue with sufficient luminance efficiencies for multicolor display. White-light OLEDs can be realized using a combination of three emitter layers of fabricationg a multimode microcavity device[9], but there is still no single fluorescent material providing white light. An approach to realize such device characteristics is to use active layers of lanthanide complexes with thier inherent extremely sharp emission bands in stead of commonly known organic dyes. In general, organic molecular compounds show emission due to thier π-π* transitions resulting in luminescence bandwidths of about 80 to 100 nm. Spin statistic estimations lead to an internal quantum efficiency of dye-based EL devices limited to 25%. On the contrary, the fluorescence of lanthanide complexes is based on an intramolecular energy transfer from the triplet of the organic ligand to the △f energy states of the ion. Therefore, theoretical internal quantum efficiency is principally not limited. In this study, several lanthanide complexes such as Tb(ACAC)₃(Phen) and Tb(ACAC)₃(Cl-Phen) were synthesized and the electroluminescence (EL) characteristics of anode/TPD/Tb(ACAC)₃(Phen)/Bebq₂/cathode and anode/TPD/Tb(ACAC)₃(Cl-Phen)/Bebq₂/cathode, where low work function metal alloys such as Li:Al was used as the electron-injecting electrode (cathode).
1인 가구를 위한 아두이노 기반의 개인 택배 보관 시스템 개발
표상우 ( Sangwoo Pyo ),박태민 ( Taemin Park ),신해찬 ( Haechan Shin ),장명호 ( Myungho Jang ),김희주 ( Heeju Kim ),이재혁 ( Jaehyeok Lee ),유헌창 ( Heonchang Yu ) 한국컴퓨터교육학회 2018 한국컴퓨터교육학회 학술발표대회논문집 Vol.22 No.1
오늘날 스마트폰, 태블릿과 같은 모바일 디바이스가 등장하고, 무선 네트워크의 기술이 향상되면서 모바일 쇼핑 이용률이 높아지고 있다. 이에 따라 택배의 사용률도 증가하고 있는데, 택배를 수령하는 일반적인 방법으로 직접 수령하는 것과 공동 택배 보관 장소를 통해 수령하는 것이 있다. 그러나 이러한 방법들은 택배기사와 시간을 정해야 하는 번거로움, 택배기사를 위장한 범죄, 그리고 공동 택배 보관 장소에서의 택배 분실 등과 같은 문제점이 존재한다. 따라서 본 연구에서는 1인 가구와 택배 수령에 어려움을 겪는 가구를 위한 개인 택배 보관 시스템을 개발하였다. 이 시스템은 안드로이드 어플리케이션에서 택배에 부착된 바코드를 스캔하여 그 정보를 아두이노와 블루투스 통신을 통해 전달한다. 이때, 아두이노는 미리 저장된 운송장 번호와 수신한 운송장 번호를 비교하여 택배 보관 시스템의 잠금 장치를 열고 닫는다.
진공 증착법에 의한 Terbium Complex 박막의 제작 및 특성 연구
표상우,김영관,손병청 ( Sang Woo Pyo,Young Kwan Kim,Byoung Chung Sohn ) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.3
In this study, organic electroluminescent devices(OELD) with a structure of a glass substrate/ITO/TPD/Tb(ACAC)_3(Phen-Cl)/Alq_3/Al was fabricated by vacuum evaporation method, where Tb complex was known to have green light emitting property. Electroluminescent(EL) and I-V characteristics of this structure were investigated. This triple-layer structure shows the green EL spectrum at the wavelwngth of 546nm, which is almost the same as the PL spectrum of Tb(ACAC)_3(Phen_Cl). It was found in current-voltage(I-V) characteristics of the devices that the operating voltage was about 12V.
란탄계 금속 착화합물을 이용한 다양한 유기 전기 발광 소자의 연구
표상우,김윤명,이한성,김정수,이승희,김영관 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.5
In this study several lanthanide complexes such as Eu(TTA)$_3$(Phen), Tb(ACAC)$_3$-(Cl-Phen) were synthesized and the white-light electroluminescence(EL) characteristics of their thin films were investigated where the devices having structures of anode/TPD/Tb(ACAC)$_3$(Cl-Phen)/Eu(TTA)$_3$(Phen)/Alq$_3$or Bebq$_2$/cathode and the low work function metal alloy such as Li:Al was used as the electron injecting electrode(cathode). Device structure of glass substrate/ITO/TPD(30nm)/Tb(ACAC)$_3$(Phen)(30nm)/Eu(TTA)$_3$(Phen)(6nm)/DCM doped Alq$_3$(10nm)/Alq$_3$(20nm)/Li:Al(100nm) was also fabricated and their EL characteristics were investigated where Eu(TTA)$_3$(Phen) and DCM doped Alq$_3$were used as red light-emitting materials. It was found that the turn-on voltage of the device with non-doped Alq$_3$was lower than that of the devices with doped Alq$_3$and the blue and red light emission peaks due to TPD and Eu(TTA)$_3$(Phen) with non-doped Alq$_3$were lower than those with DCM doped Alq$_3$Details on the white-light-emitting characteristics of these device structures were explained by the energy and diagrams of various materials used in these structure where the energy levels of new materials such as ionization potential(IP) and electron affinity(EA) were measured by cyclic voltametric method.