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전면 유기발광 다이오드 기능층 캐핑레이어 적용에 따른 효율상승에 관한 연구
이동운,조의식,전용민,권상직,Lee, DongWoon,Cho, Eou Sik,Jeon, Yongmin,Kwon, Sang Jik 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.3
Top emission organic light-emitting diode (TEOLED) is commonly used because of high efficiency and good color purity than bottom - emission organic light-emitting device (BEOLED). Unlike BEOLED, TEOLED contain semitransparent metal cathode and capping layer. Because there are many characteristics to consider just simple thickness change, optimizing organic thickness of TEOLED for microcavity is difficult. So, in this study, we optimized Device capping layer at unoptimized micro-cavity structure TEOLED device. And we compare only capping layer with unoptimized microcavity structure can overcome optimized micro-cavity structure device. We used previous our optimized micro-cavity structure to compare each other. As a result, it has been found that the efficiency can be obtained almost the same or higher only capping layer, which is stacked on top of the device and controls only the thickness and refractive index, without complicated structural calculations. This means that higher efficiencies can be obtained more easily in laboratories with limited organic materials or when optimizing new structures etc.
유기발광 다이오드의 정공수송층 두께에 따른 미소 공진 효과의 영향에 관한 연구
권상직,이동운,조의식,성진욱 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.1
Top emission organic light-emitting diode is commonly used because of high efficiency and good color purity than bottom – emission organic light-emitting device. Unlike BEOLED, TEOLED contain semi-transparent metal cathode. Because of semi-transparent cathode, micro cavity effect occurs in TEOLED. We optimized this effect by changing the thickness of hole injection layer. Device consists of is indium-tin-oxide / N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl-4,4'-diamine (x nm) / tris-(8-hydroxyquinoline) aluminum (50nm) / LiF(0.5nm) / Mg:Ag (1:9), and we changed NPB thickness which is used as HTL in our device in order to study how micro cavity effects are changed by optical path. As the results, NPB thickness at 35nm showed the current efficiency of 8.55Cd/A.
Europium complexes 단층과 다층 구조 박막의 전기적ㆍ광학적 특성에 관한 연구
이명호,표상우,이한성,김영관,김정수 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
Electroluminescent(EL) devices based on organic materials have been of great interest due to their possible applications for large-area flat-panel displays, where they are attractive because of their capability of multicolor emission, and low operation voltage. In this study, glass substrate/ITO/Eu(TTA)$_3$(phen)/Al, glass substrate/ITO/Eu(TTA)$_3$(phen)/Al and glass substrate/ITO/Eu(TTA)$_3$(phen)/AlQ$_3$/Al structures were fabricated by vacuum evaporation method, where aromatic diamine(TPD) was used as a hole transporting material, Eu(TTA)$_3$(phen) as an emitting material, and Tris(8-hydroxyquinoline) aluminu-m(AlQ$_3$) as an electron transporting layer. Electrolumescent(EL) and I-V characteristics of Eu(TTA)$_3$-(-phen) were investigated. These structures show the red EL spectra, which are almost the same at the PL spectrum of Eu(TTA)$_3$(phen). I-V characteristics of this structure show that turn-on voltage was 9V and current density was 0.01A/㎤ at a operation voltage of 9V. Electrical transporting phenomena of these structures were explained using the trapped-charge-limited current model with I-V characteristics.
Conjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes
Lee, Bo Ram,Yu, Jae Choul,Park, Jong Hyun,Lee, Seungjin,Mai, Cheng-Kang,Zhao, Baodan,Wong, Matthew S.,Jung, Eui Dae,Nam, Yun Seok,Park, Song Yi,Di Nuzzo, Daniele,Kim, Jin Young,Stranks, Samuel D.,Baza American Chemical Society 2018 ACS NANO Vol.12 No.6
<P>Perovskite-based optoelectronic devices have been rapidly developing in the past 5 years. Since the first report, the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs) has increased rapidly through the control of morphology and structure from 0.1% to more than 11%. Here, we report the use of various conjugated polyelectrolytes (CPEs) as the hole injection layer in PeLEDs. In particular, we find that poly[2,6-(4,4-bis-potassium butanylsulfonate)-4<I>H</I>-cyclopenta-[2,1-<I>b</I>;3,4-<I>b</I>′]-dithiophene)] (PCPDT-K) transfers holes effectively, blocks electron transport from the perovskite to the underlying ITO layer, and reduces luminescence quenching at the perovskite/PCPDT-K interface. Our optimized PeLEDs with PCPDT-K show enhanced EQE by a factor of approximately 4 compared to control PeLEDs with PEDOT:PSS, reaching EQE values of 5.66%, and exhibit improved device stability.</P> [FIG OMISSION]</BR>
형광 Green OLED HTL, EML 두께에 따른 특성 변화 분석
안지현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In this paper, we studied effects on optical and eletrical characteristics of green fluorescent OLEDs, according to the change of thickness of the HTL made of NPB from 30nm to 50nm, EML and ETL made of Alq3 from 50nm to 70nm. We analzyed luminance, current density, current efficiency, turn on voltage, and so on. The driving voltage of OLED device was decreased with decreasing total thickness. The luminance at the 70nm of ETL is 16800 Cd/㎡, higher than 11800 Cd/㎡ at 50nm of ETL, but striking transition of luminace by changing HTL thickness was not found. The current efficiency at 200mA/㎠ was increased from 1.9 Cd/A at 50nm ETL to 2.5 Cd/A at 70nm. In the result of experiments, we confirmed that the thickness of HTL has less effective influence but the efficiency of OLEDs are dependent on the thickness of EML and ETL.