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Efficient Luminescence from Perovskite Quantum Dot Solids

ACS Applied Materials & Interfaces · 2015 · Vol. 7(45) · pp. 25007–25013

Younghoon Kim✉(University of Toronto)Emre Yassitepe(University of Toronto)Oleksandr Voznyy(University of Toronto)Riccardo Comin(University of Toronto)Grant Walters(University of Toronto)Xiwen Gong(University of Toronto)Pongsakorn Kanjanaboos(University of Toronto)Ana F. Nogueira(Universidade Estadual de Campinas (UNICAMP))Edward H. Sargent(University of Toronto)

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Abstract

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' 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.

Perovskite Materials and Applications Quantum Dots Synthesis And PropertiesPhotoluminescenceMaterials scienceNanocrystalPerovskite (structure)Quantum dotLuminescenceFabricationNanotechnologyQuantum yieldOptoelectronics