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Type: Artigo
Title: Amine-free Synthesis Of Cesium Lead Halide Perovskite Quantum Dots For Efficient Light-emitting Diodes
Author: Yassitepe
Emre; Yang
Zhenyu; Voznyy
Oleksandr; Kim
Younghoon; Walters
Grant; Castaneda
Juan Andres; Kanjanaboos
Pongsakorn; Yuan
Mingjian; Gong
Xiwen; Fan
Fengjia; Pan
Jun; Hoogland
Sjoerd; Comin
Riccardo; Bakr
Osman M.; Padilha
Lazaro A.; Nogueira
Ana F.; Sargent
Edward H.
Abstract: 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.
Editor: Wiley-V C H Verlag Gmbh
Citation: Advanced Functional Materials. Wiley-v C H Verlag Gmbh, v. 26, p. 8757 - 8763, 2016.
Rights: fechado
Identifier DOI: 10.1002/adfm.201604580
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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