Efficient Luminescence from Perovskite Quantum Dot Solids

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• 作者：Younghoon Kim ; Emre Yassitepe ; Oleksandr Voznyy ; Riccardo Comin ; Grant Walters ; Xiwen Gong ; Pongsakorn Kanjanaboos ; Ana F. Nogueira ; Edward H. Sargent
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25007-25013
• 全文大小：533K
• ISSN：1944-8252

文摘

Nanocrystals of CsPbX₃ perovskites are promising materials for light-emitting optoelectronics because of their colloidal stability, optically tunable bandgap, bright photoluminescence, and excellent photoluminescence quantum yield. Despite their promise, nanocrystal-only films of CsPbX₃ perovskites have not yet been fabricated; instead, highly insulating polymers have been relied upon to compensate for nanocrystals鈥?unstable surfaces. We develop solution chemistry that enables single-step casting of perovskite nanocrystal films and overcomes problems in both perovskite quantum dot purification and film fabrication. Centrifugally cast films retain bright photoluminescence and achieve dense and homogeneous morphologies. The new materials offer a platform for optoelectronic applications of perovskite quantum dot solids.