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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Next-Generation Light Emitters: Halide Perovskite Light-emitting Diodes

등록일
2018년 8월 29일 17시 00분 15초
접수번호
1966
발표코드
MAT2-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 14시 : 55분
발표형식
심포지엄
발표분야
Material Chemisty - Frontier of Materials Chemistry: Photosciences
저자 및
공동저자
Tae-Woo Lee
Department of Materials Science and Engineering, Seoul National University, Korea
Metal halide perovskites have emerged as promising next-generation light emitter due to their advantages such as high luminescence efficiency, high color purity, low material cost, solution processability, high charge-carrier mobility, and defect-tolerant electronic structure. Nevertheless, the low electroluminescence (EL) efficiency of perovskite light-emitting diodes (PeLEDs) at room temperature has been a big challenge which should be overcome. Here, we present high-efficiency PeLEDs using various strategies to overcome the EL efficiency limitations. First, we demonstrated a self-organized buffer hole injection layer to reduce the hole injection barrier and suppress the exciton quenching at the interface. Also, we showed that the formation of metallic lead clusters can cause strong exciton quenching and non-radiative recombination, which was prevented by finely increasing the molar proportion of methylammonium bromide (MABr) in MAPbBr3 solution. Further, the EL efficiency could be dramatically enhanced by decreasing the size of MAPbBr3 grains with improved uniformity and coverage of MAPbBr3 layers. High-efficiency flexible MAPbBr3 PeLEDs has been also demonstrated by using ideal anodes including graphene and ITO-free polymeric anode materials, which boosted the highest EQE up to 10.93% for pure green PeLEDs. We also developed mixed-cation systems with new substitute cations for MA using stable formamidinium (FA) and cesium (Cs), demonstrating first highly efficient and stable polycrystalline PeLEDs based on mixed cations. Furthermore, we developed efficient quasi-2D PeLEDs using Ruddlesden-Popper phase formed by incorporation of long alkyl cations and precise control over layered 2D structures.

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