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Title: Amine-Free Synthesis of Cesium Lead Halide Perovskite Quantum Dots for Efficient Light-Emitting Diodes
Authors: Emre Yassitepe
Zhenyu Yang
Oleksandr Voznyy
Younghoon Kim
Grant Walters
Juan Andres Castañeda
Pongsakorn Kanjanaboos
Mingjian Yuan
Xiwen Gong
Fengjia Fan
Jun Pan
Sjoerd Hoogland
Riccardo Comin
Osman M. Bakr
Lazaro A. Padilha
Ana F. Nogueira
Edward H. Sargent
University of Toronto
Universidade Estadual de Campinas
King Abdullah University of Science and Technology
Mahidol University
Keywords: Chemistry;Materials Science
Issue Date: 20-Dec-2016
Citation: Advanced Functional Materials. Vol.26, No.47 (2016), 8757-8763
Abstract: © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Cesium lead halide perovskite quantum dots (PQDs) have attracted significant interest for optoelectronic applications in view of their high brightness and narrow emission linewidth at visible wavelengths. A remaining challenge is the degradation of PQDs during purification from the synthesis solution. This is attributed to proton transfer between oleic acid and oleylamine surface capping agents that leads to facile ligand loss. Here, a new synthetic method is reported that enhances the colloidal stability of PQDs by capping them solely using oleic acid (OA). Quaternary alkylammonium halides are used as precursors, eliminating the need for oleylamine. This strategy enhances the colloidal stability of OA capped PQDs during purification, allowing us to remove excess organic content in thin films. Inverted red, green, and blue PQD light-emitting diodes (LED) are fabricated for the first time with solution-processed polymer-based hole transport layers due to higher robustness of OA capped PQDs to solution processing. The blue and green LEDs exhibit threefold and tenfold improved external quantum efficiency (EQE), respectively, compared to prior related reports for amine/ammonium capped cross-linked PQDs. The brightest blue LED based on all inorganic CsPb(Br1−xClx)3 PQDs is also reported.
ISSN: 16163028
Appears in Collections:Scopus 2016-2017

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