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RISS 인기검색어
- 검색키워드
- 저자 : Park Byung-Geon (검색결과 1 건)
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Submicron Quantum Dot Pixel Arrays Based on Electrophoretic Deposition for Light Emitting Diode
Park, Byung-Geon 부산대학교 2023 국내박사
Displays that are indispensable things in our lives, have developed in the direction of getting thinner, higher resolution, and richer colors. For this reason, many researchers has studied the quantum dot light emitting diode (QD-LED) which has high color purity and an ultra-thin structure that does not require a backlight. However, the technology for arraying quantum dots (QDs) for an ultra high resolution of over 2,000 ppi suitable for virtual reality (VR) devices is insufficient. Here in, I demonstrate that a new method to array the QDs in ultra high resolution which has not been reached by any technology and manufactured and evaluated a QD-LED with this QD array. For this purpose, the ligands of QDs were modified to be suitable for EPD and dispersed in water and QDs could be effectively arranged only in the pixel region through the difference in surface energy. By using electrophoretic deposition (EPD), not only a full color array of 2 μm × 6 μm sub-pixels, but also a monochromatic array of 0.5 μm width was made, thereby successfully fabricating the QD array of less than 1 μm. Here, optimal process conditions were derived using Taguchi method to uniformly deposit QDs. In addition to QDs, the zinc oxide (ZnO) layer, which is the electron injection layer (EIL) and electron transport layer (ETL), was also manufactured by EPD to avoid cross talk issues. Thus, from the EIL to the QD layer, only one photo lithography and solution process were used. The fabricated QD-LED of over 2,000 ppi achieved an external quantum efficiency of 6.31%, which showed superior performance than the toluene based conventional QD EL device, demonstrating the superiority of the QD array using EPD. In addition, it has a great meaning by showing high performance even though the resolution was kept differently from the other processes that made large pixels due to the difficulty of the process when fabricating the electroluminescence device. The proposed EPD process enables QD arrays regardless of substrate materials such as transparent substrates, opaque substrates, and flexible substrates, so, it is applicable to various industries like televisions, mobile devices, flexible displays, and transparent displays. In particular, it is expected that the era of realistic VR without screen door effect will be opened by producing of ultra high resolution displays.
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