Boosting Tunable Blue Luminescence of Halide Perovskite Nanoplatelets through Postsynthetic Surface Trap Repair.

Autor:	Bohn BJ; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany., Tong Y; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany., Gramlich M; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany., Lai ML; Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom., Döblinger M; Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 (E) , 81377 Munich , Germany., Wang K; Lehrstuhl für Funktionelle Materialien, Physik Department , Technische Universität München , James-Franck-Strasse 1 , 85748 Garching , Germany., Hoye RLZ; Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom., Müller-Buschbaum P; Lehrstuhl für Funktionelle Materialien, Physik Department , Technische Universität München , James-Franck-Strasse 1 , 85748 Garching , Germany., Stranks SD; Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom., Urban AS; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany., Polavarapu L; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany., Feldmann J; Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.; Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2018 Aug 08; Vol. 18 (8), pp. 5231-5238. Date of Electronic Publication: 2018 Jul 16.
DOI:	10.1021/acs.nanolett.8b02190
Abstrakt:	The easily tunable emission of halide perovskite nanocrystals throughout the visible spectrum makes them an extremely promising material for light-emitting applications. Whereas high quantum yields and long-term colloidal stability have already been achieved for nanocrystals emitting in the red and green spectral range, the blue region currently lags behind with low quantum yields, broad emission profiles, and insufficient colloidal stability. In this work, we present a facile synthetic approach for obtaining two-dimensional CsPbBr 3 nanoplatelets with monolayer-precise control over their thickness, resulting in sharp photoluminescence and electroluminescence peaks with a tunable emission wavelength between 432 and 497 nm due to quantum confinement. Subsequent addition of a PbBr 2 -ligand solution repairs surface defects likely stemming from bromide and lead vacancies in a subensemble of weakly emissive nanoplatelets. The overall photoluminescence quantum yield of the blue-emissive colloidal dispersions is consequently enhanced up to a value of 73 ± 2%. Transient optical spectroscopy measurements focusing on the excitonic resonances further confirm the proposed repair process. Additionally, the high stability of these nanoplatelets in films and to prolonged ultraviolet light exposure is shown.
Databáze:	MEDLINE
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