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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.
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).
표상우 ( Sang Woo Pyo ),이민우 ( Min Woo Lee ),손병청 ( Byung Chung Sohn ),김영관 ( Young Kwan Kim ) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.4
N/A Natto, one of Japanese traditional food is made from steamed whole soybeans fermented with Bacillus natto. In this study, the effects of Natto mucilage- feeding on griwth, organ weight and serum nitrogen compounds of rats were investigated. Male rats in Sprague-Dawley strain were fed on basal diets supplemented with aqueous Natto mucilage of several percentages for 10 weeks. Natto mucilage had no significant effects on the body and organ weights. The levels of GOT, GPT, LDH, and total bilirubin in serum of rats fed Natto mucilage diets were significantly lower than those in the control group. The levels of total protein and albumin were higher than those in the control group. The level of calcium in serum indicates a growing tendency, but creatinine, uric acid, and BUN had declining. And the most component of free amino acids in Natto mucilage were glutamin acid.