• Journal of the Semiconductor & Display Technology
• /
• v.21 no.3
• /
• pp.119-124
• /
• 2022

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.

• Journal of the Semiconductor & Display Technology
• /
• v.21 no.1
• /
• pp.71-74
• /
• 2022

For the process simplification in the fabrication of organic light emitting diode(OLED), top emission OLED (TEOLED) was fabricated without lithium fluoride(LiF) used as an electron injection layer (EIL). After co-deposition of Mg and Ag with a different process conditions, a cathode material adjacent to EIL was optimized when Mg and Ag have a ratio of 1:9 considering sheet resistance and transmittance. From the energy band diagram of TEOLED, band gap difference between Trisaluminium (Alq3) and Mg:Ag cathode show the difference of 0.4 eV according to the usage of LiF The fabricated TEOLED without LiF showed the improvement of 5.2 % and 2.7 % in the luminance and the current density comparing that with LiF. The results show there is no significant difference in OLED characteristics regardless of LIF layer in the TEOLED structures.

• Journal of the Semiconductor & Display Technology
• /
• v.21 no.1
• /
• pp.91-94
• /
• 2022

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.

• Journal of the Semiconductor & Display Technology
• /
• v.17 no.4
• /
• pp.6-10
• /
• 2018

Organic light emitting devices have attracted the attention of many people because of their high potential for self-emission and flexible display devices. However, due to limitations in device efficiency and lifetime, partial commercialization is underway. In this paper, we have investigated the electrical conduction mechanism of the organic light emitting device by the temperature and the thickness of the light emitting layer through the current - voltage characteristics with respect to the conduction mechanism directly affecting the efficiency and lifetime of the organic light emitting device. Through the study, it was found that the conduction in the low electric field region is caused by the movement of the heat excited charge in the ohmic region and the tunneling of the electric charge due to the high electric field in the high electric field region.

• Journal of the Semiconductor & Display Technology
• /
• v.17 no.1
• /
• pp.50-53
• /
• 2018

Cyclic measurement system using relay circuit for organic light emitting diode (OLED) was demonstrated. The OLED characterization such as current-voltage, impedance, and capacitance-voltage is performed in sequence, repetitively and automatically under full control of the personnel computer (PC) without changing the connection of cables. Owing to in situ degradation by cyclic measurement, the time dependence of the data can give good information on the reliability factor of the OLED devices. Therefore, both performance and reliability of the OLEDs can be evaluated, with no manual operation during the entire process.

• Journal of the Semiconductor & Display Technology
• /
• v.20 no.3
• /
• pp.131-135
• /
• 2021

Numbers of studies related to optimization of design of organic light emitting diodes(OLED) through machine learning are increasing. We propose the generative method of the image to assess the performance of the device combining with machine learning technique. Principle parameter regarding dark spot growth mechanism of the OLED can be the key factor to determine the long-time performance. Captured images from actual device and randomly generated images at specific time and initial pinhole state are fed into the deep neural network system. The simulation reinforced by the machine learning technique can predict the device parameters accurately and faster. Similarly, the inverse design using multiple layer perceptron(MLP) system can infer the initial degradation factors at manufacturing with given device parameter to feedback the design of manufacturing process.

• The Journal of the Korea Contents Association
• /
• v.19 no.6
• /
• pp.663-675
• /
• 2019

During the last decade, the dominant design of display has been LCD, and it has been led by Korean manufacturers. However, their leading positions has been recently threatened by Chinese manufacturers, Korean manufacturers are endeavoring to move toward next generation display technologies. They embarked on standards battle to win dominant design especially in the next generation display market for TVs by launching new technologies such as Quantum-dot display and OLED. While there are a number of factors of dominant design, it is expected that the technical attributes of the technology itself may be the most significant factor. For this reason, this research scrutinizes consumer preferences for technical attributes, and attempts to provide implications for standards battle in the display (for the TVs) sector. For this purpose, we employed a conjoint analysis for the preferences of potential consumers. The results show that potential consumers prefer displays with higher resolution, natural color, and durabillity.

• Journal of the Korean Chemical Society
• /
• v.44 no.3
• /
• pp.243-248
• /
• 2000

Oganic electroluminescent devices (OELD) with multilayer structures have been studied actively for the application to a flat-panel display. Netal-chelate complexes hrboxylate. These complexes were characterized by FT-IR, MS/FAB, $^1$H-NMR, UV-vis and photoluminescence (PL). More importantly, the electrochemical gap (Eg), electron affinity(EA) and ionization potential (IP) of these complex films were investigated. Data from cyclic voltammetry(CV) were compared with the bandgap obtained from UV-vis and discussed. Further studies on the EL of these new materials are now in progress.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2001.07a
• /
• pp.186.2-189
• /
• 2001

요실리콘을 기반으로 하는 박막은 반도체 재료로 Si, Si:Ge, SiC등이 사용되고있으며, 절연박막재료로 SiN, SiOxNy, SiOx 등이 있다. 이들 재료는 국내 반도체 산업의 핵심위치에 있는 물질이다. 한국 산업의 근간이라 할 수 있는 메모리분야에 적용될 뿐만 아니라 TFT-LCD, 태양전지, 각종 센서, X-ray 사진 촬영기 개발에도 응용되고 있다. 본 논문에서는 Silicon-based 박막의 제조기법과 그에 따른 다양한 실리콘 박막 실리콘 트랜지스터를 이용한 능동형 액정과 유기발광 화소제어 활용, 센서 응용 부분에서 태양전지, X-ray 촬영기활용 분야에서 기술현황 시장분석을 통해 차세대 연구개발의 방향을 제시하고자 한다. 현재 국내에서 실리콘 박막의 가장 큰 응용 분야는 메모리 소자의 평판디스플레이의 TFT-LCD 시장이다. 그러나 실리콘 박막으로 가능한 응용분야는 아직 산업계에서 열매를 맺지 못한 분야가 더 많고 실제로 적용할 수 있는 분야의 다양함을 본 논문을 통해 소개한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.8
• /
• pp.1653-1662
• /
• 2012

Recently, Organic Light Emitting Diode (OLED) that is broadly applied as next generation display has various advantages. However, OLED display causes unbalanced color tone due to the difference of luminance efficiency among luminous elements. In this paper, we propose adaptive color shifter (ACS) to resolve the RGB channel unbalance and to have wide color range of a relatively weak channel using the image processing method. proposed ACS system was simulated using a variety of image. Also, we numerically analyzed using hue histogram, CIE-1931 xyz color space.