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Synthesis of New Binder Polymers for Photolithographic Patterning of Black Pixel Define Layers of Organic Light emitting Diode

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Materials Sciences and Applications 2019年第11期10卷 687-696页

作者： Genggongwo Shi Kyeongha Baek Seon Hong Ahn Jun Bae Jeseob Kim Lee Soon Park CCTech. Co. Ltd Hwaseong Korea School of Material Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea Duksan Neolux Co. Ltd. Cheonan Korea

The fabrication of black pixel define layer (PDL) on the organic light emitting diode (OLED) panel has been developed actively by using negative-tone black photoresist which contain photoinitiator, photosensitizer, binder polymer, multifunctional monomer and black mill base in order to improve the outdoor visibility of OLEDs. Cardo type binder polymer containing bulky and rigid fluorene group has been widely used in the black photoresist formulation. However, the commercial cardo binder polymer has high cost and requires high UV dose for the fine patterning of PDL in the photolithographic process. In this study we designed and synthesized various non-cardo type binder polymers and evaluated the new binder polymers in comparison with the cardo binder polymer for the improved patterning of PDL on the OLED panel.

关键词： Organic Light emitting Diode Pixel Define Layer Photolithography One-Pot Synthesis

Interface engineering yields efficient perovskite light-emitting diodes

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Journal of Semiconductors 2023年第12期44卷 4-7页

作者： Rashid Khan Guangyi Shi Wenjing Chen Zhengguo Xiao Liming Ding Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS) Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Metal-halide perovskites(MHPs)have emerged as a new class of semiconductors used in perovskite solar cells(PSCs)[1-5],perovskite light-emitting diodes(PeLEDs)[6-12],photo/X-ray detectors[13-16],and memristors[17,18].P... 详细信息

关键词： diodes emitting LEDs

Enhancement of Performance of Organic Light emitting Diodes by Using Ti- and Mo-Oxide Nano Hybrid Layers

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Materials Sciences and Applications 2013年第4期4卷 275-280页

作者： Nguyen Nang Dinh Do Ngoc Chung Tran Thi Thao Tran Thi Chung Thuy Le Ha Chi Vo-Van Truong Department of Physics Concordia University Montreal Canada Institute of Materials Science Vietnamese Academy of Science and Technology Hanoi Vietnam University of Engineering and Technology Vietnam National University Hanoi Hanoi Vietnam Water Resources University Hanoi Vietnam

Nanorod-like TiO2 (nc-TiO2) and MoO3 (nc-MoO3) films were thermally grown from Ti- and Mo-metallic wafers. Nanohybrid films of N,N’-diphenyl-N,N’-bis(1-naphthyl)(1,1’-biphenyl)-4,4’diamine (NPB)/TiO2 and NPB/MoO3 used as anode/hole transport layer (HTL) heterojunctions in blue organic light emission diodes (OLEDs) were prepared by coating NPB onto the nc-TiO2 and nc-MoO3 and TiO2. Characterization of the nanostructured hybrid layers showed that both the photoluminescent property and current-voltage (I-V) characteristics of the hybrid materials were significantly enhanced in comparison with the standard NPB polymer. The electroluminous efficiency of the hybrid devices was considerably enhanced in comparison with the standard device. This suggests a useful application for fabricating “reverse” OLEDs, where the emission light goes-out through the semitransparent cathode, instead of the indium tin oxide (ITO) anode. For this, the ohmic contacts of conducting wires to metallic electrodes can be made much better than to ITO anodes.

关键词： Organic Light emitting Diodes (OLED) Hybrid Heterojunctions Curent-Voltage (I-V) Characteristic Luminous Efficiency

Black Photoresist for Patterning Pixel Define Layer of Organic Light emitting Diode with Polyimide as Thermal Stabilizer

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Materials Sciences and Applications 2018年第6期9卷 554-564页

作者： Genggongwo Shi Jin Woo Park Lee Soon Park CC Tech Cheonan South Korea Samsung Display Co. Ltd. Yongin South Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea

In order to improve the visibility for outside use of organic light emitting diodes (OLEDs), the polarized film and black matrix pattern have been used in the small and medium sized OLEDs;however, these cause problem of reducing the emission efficiency of OLED. Changing the color of pixel define layer (PDL) from brown to black is an important point for improving the efficiency and visibility of OLEDs. In this work we studied the photoresist material containing black pigment and the photolithographic process for patterning of black PDL on OLEDs. The black PDL patterns made with our synthesized polyimides as thermal stabilizer were found to give high thermal stability over 300°C.

关键词： Organic Light emitting Diode Pixel Define Layer Black Pixel Define Layer Photolithography

Light emitting Diodes as a Rapid Visual Display for Use in Psychological Experiments

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Optics and Photonics Journal 2013年第1期3卷 93-97页

作者： Clementine Thurgood T. W. Allan Whitfield National Institute for Design Research Swinburne University of Technology Melbourne Australia

In this paper we show how light emitting diodes (LEDs) can be used in conjunction with existing display technologies as a means for achieving ultra-rapid visual stimulus exposure durations. We review existing rapid visual display methods, and show how our apparatus overcomes the limitations inherent with each technique. Our apparatus, the LED tachistoscope, takes advantage of the fast-switching times and high-brightness capabilities of LEDs in order to present stimuli at previously unachievable durations as rapid as 1 ms. The rapid exposure durations are achieved by external LED backlight illumination of images on a liquid crystal display (LCD) after the components of the LCD have stabilized. This ensures that stimulus onset and offset are discrete. Furthermore, the fast-switching of the LEDs enables stimuli to be revealed for very rapid durations. The paper also describes studies in which the LED tachistoscope has already been applied, and offers suggestions for other possible applications. Interestingly, in our studies we show that the human visual system is very adept at extracting information with only very minimal stimulus exposure durations. Such studies have not been possible with existing display equipment. The LED tachistoscope opens up avenues for a variety of psychological and physiological experiments and provides a means for revealing the limits of human visual perception.

关键词： Light emitting Diode Tachistoscope Liquid Crystal Display Rapid Exposure Visual Perception

Optical properties for N,N’-bis (lnaphyhly)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine and tris (8-hydroxyquinolinato) aluminum in organic light emitting devices

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Natural Science 2010年第6期2卷 631-634页

作者： Mei Yee Lim Wan Mahmood Mat Yunus Zainal Abidin Talib Anuar Kassim 不详

The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers in organic light-emitting devices (OLED) have been investigated. The NPB and Alq3 layers were prepared using thermal evaporation method. The results show that the energy band gap of Alq3 is thickness independence while the energy band gap of NPB decreases with the increasing of sample thickness. For the case of photoluminescence the Alq3 with thickness of 84 nm shows the highest relative intensity peak at 510 nm.

关键词： Energy Band Gap N N’-Bis (Inaphthyl) -N N’-Diphenyl-1 1’-Biphenyl-4 4’-Diamine Tris (8 Hydroxyquinolinato) Aluminum Organic Light emitting Diode Photoluminescence

High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-emitting Diode for Detection of Natural Hazard Ozone

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Journal of Environmental Protection 2012年第8期3卷 695-699页

作者： Yoshinobu Aoyagi Misaichi Takeuchi Kaoru Yoshida Masahito Kurouchi Tsutomu Araki Yasushi Nanishi Hiroyasi Sugano Yumi Ahiko Hirotaka Nakamura Hikari Tec 4Miura-ori Lab. 1687 kanamori Machida Tokyo Japan Miura-ori Lab. 1687 kanamori Machida Tokyo Japan Ritsumeikan University Faculty of Engineering Science 1-1-1 Noji-higashi Shiga Japan Ritsumeikan University Global Innovation Research Organization Tokyo Metropolitan Industrial Technology Research Institute 3-13-10 Nishigaoka Kitaku Tokyo Japan

Recently ozone is one of natural hazards which comes from cars, industry using ozone for sterilization of organic and inorganic materials and for water purification. So, ozone sensing becomes very important, and convenient and accurate ozone sensor is required. A new high sensitivity ozone sensing system using an deep ultra-violet light emitting diode (DUV-LED) operated at the wavelength of 280 nm has been successfully constructed. The fabrication of diode operated at 280 nm is much easier than that of DUV-LED operated at Hg lamp wavelength of 254 nm. The system is compact and possible to sense the ozone concentration less than 0.1 ppm with an accuracy of 0.5% easily with low power DUV-LED of around 200 micro Watts operated at 280 nm without any data processing circuit.

关键词： Ozone Sensing Deep Ultra Violet Light emitting Diode DUV-LED High Sensitivity Long Life Compact

Erratum to: Materials and devices for flexible and stretchable photodetectors and light-emitting diodes

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Nano Research 2021年第11期14卷 4362-4362页

作者： Jun-Kyul Song Min Sung Kim Seungwon Yoo Ja Hoon Koo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul08826Republic of Korea School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National UniversitySeoul08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea

Erratum to Nano Research 2021,14(9):2919-2937 https://***/10.1007/s 12274-021-3447-3 The figure caption of Figure 1,instead of Figure 1 Schematic illustration of various nanomaterials and organic materials used in fle... 详细信息

关键词： diodes emitting Figure

Thermal analysis of an LED module with a novelly assembled heat pipe heat sink

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Journal of Central South University 2017年第4期24卷 921-928页

作者： TANG Yong CHEN Qiu GUAN Wo-huan LI Zong-tao YU Bin-hai YUAN Wei School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China

This work aims to improve the thermal performance of a light emitting diode(LED) module by employing a novelly assembled heat pipe heat sink. The heat pipe was embedded into the heat sink by a phase change expansion assembly(PCEA) process, which was developed by both finite element(FE) analysis and experiments. Heat transfer performance and optical performance of the LED modules were experimentally investigated and discussed. Compared to the LED module with a traditionally assembled heat pipe heat sink, the LED module employing the PCEA process exhibits about 20% decrease in the thermal resistance from the MCPCB to the heat pipe. The junction temperature is 4% lower and the luminous flux is 2% higher. The improvement in the thermal and optical performance is important to the high power LED applications.

关键词： light emitting diode (LED) phase change assembly heat pipe heat sink thermal analysis