最近の若者はヘタレが多くなったと日頃嘆いている管理人であるが、たまにオオやるなあと思わせるのがいる。
来週、大学で講演してもらう冨田勇人氏は、千歳科学技術大で学部、うちで修士、そして博士をドイツの大学で取得したというまれなケースである。
しかも、安達研究室、城戸研究室、レオ研究室という有機ELでも世界のトップを突っ走っている研究室を経験しているというのはとてもとてもまれなケースである。
ということで、来週の講演会は博士を取得した凱旋帰国ということなので、祝福を兼ねて議論してやってください。
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第17回有機デバイスセミナー
日時:10月24日(金)14:00〜15:00
場所:9号館2階 会議室 200-1
題目:Alternative transparent electrodes for organic light emitting diodes
(新規透明電極を用いた有機EL素子)
講師:冨田勇人氏
ドイツ、Fraunhofer(フラウンホーファー)研究所 IPMS
講演要旨:
Solid state lighting is a new environmentally friendly light source.
So far, light emitting diodes (LEDs) and organic LEDs (OLEDs) have been presented as candidates with potentially high efficiency. Recent advances of OLEDs have ensured high efficiency, exceeding that of incandescent light bulbs. In contrast to conventional point source
LEDs, OLEDs distribute light throughout the surface area and are not restricted by their size. Additionally, OLEDs are expected to reach sufficient stability in the near future. The remaining challenge for OLEDs is their cost. New OLED technologies provide cost effective manufacturing methods which could be presented for transparent electrode materials because indium tin oxide (ITO), a widely used material as a transparent electrode for OLEDs, is less than optimal
due to its high element price.
In this work, alternative transparent electrodes for OLEDs as a replacement of ITO were studied. First, Al doped ZnO (ZnO:Al) which is composed of abundant materials was investigated with DC magnetron sputtering under a wide range of experimental conditions. The optimised ZnO:Al received comparable performance with conventional ITO films, low sheet resistance as well as a high transparency. Various type of p-i-n OLEDs were employed on the structured ZnO:Al using
photolithography. It has been found that the OLEDs on ZnO:Al anode has comparable or better device efficiencies and operational lifetime compared to OLEDs on conventional ITO anode. As another alternative electrode, the conductive polymer Baytron®PH510 (PEDOT:PSS) was
investigated. Due to a relatively high sheet resistance of PEDOT:PSS, metal grid was designed for large size OLEDs. Up-scaled devices on 10 × 10 cm2 using PEDOT anode were also demonstrated. These results showed ZnO:Al and PEDOT are suitable for OLEDs as anode and have high potential as alternative transparent electrode materials.
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