https://scholars.lib.ntu.edu.tw/handle/123456789/626207
標題: | Aggregation Control, Surface Passivation, and Optimization of Device Structure toward Near-Infrared Perovskite Quantum-Dot Light-Emitting Diodes with an EQE up to 15.4% | 作者: | Tseng Z.-L Chen L.-C Chao L.-W Tsai M.-J Luo D Al Amin N.R Liu S.-W KEN-TSUNG WONG |
關鍵字: | near-infrared emission; perovskites; quantum dots; quantum-dot light-emitting diodes | 公開日期: | 2022 | 卷: | 34 | 期: | 18 | 來源出版物: | Advanced Materials | 摘要: | In recent years, the performance of perovskite quantum dots (QDs) and QD-based light-emitting diodes (QLEDs) has improved greatly, with electroluminescence (EL) efficiency of green and red emission exceeding 20%. However, the development of perovskite near-infrared (NIR) QLEDs has reached stagnation, where the reported maximum EL efficiency is still below 6%, limiting their further applications. In this work, new NIR-emissive FAPbI3 QDs are developed by post-treating long alkyl-encapsulated QDs with 2-phenylethylammonium iodide (PEAI). The incorporation of PEAI reduces the QD surface defects for giving a high photoluminescence quantum yield up to 61.6%. The n-octane solution of PEAI-passivated FAPbI3 QDs is spin coated on top of the PEDOT:PSS-treated ITO electrode modified with a thermally crosslinked hole-transporting layer to give a full-coverage, smooth, and dense QD film. Incorporating with an effective electron-transporting material, CN-T2T, which has deep lowest unoccupied molecular orbital and good electron mobility, the optimal device with EL λmax at 772 nm achieves an external quantum efficiency up to 15.4% at a current density of 0.54 mA cm−2 (2.6 V), which is the highest efficiency ever reported for perovskite-based NIR QLEDs. This study provides a facile strategy to prepare high-quality perovskite QD films suitable for highly efficient NIR QLED applications. © 2022 Wiley-VCH GmbH. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127252631&doi=10.1002%2fadma.202109785&partnerID=40&md5=6b234a4c242eb1df152ee6af297b26be https://scholars.lib.ntu.edu.tw/handle/123456789/626207 |
ISSN: | 09359648 | DOI: | 10.1002/adma.202109785 | SDG/關鍵字: | Conducting polymers; Efficiency; Electroluminescence; Infrared devices; Light; Molecular orbitals; Nanocrystals; Organic light emitting diodes (OLED); Passivation; Perovskite; Quantum efficiency; Structural optimization; Electroluminescence efficiencies; Lightemitting diode; Near Infrared; Near-infrared; Near-infrared emissions; Performance; Quantum dot films; Quantum-dot light emitting diodes; Surface optimization; Surface passivation; Semiconductor quantum dots |
顯示於: | 化學系 |
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