Author(s): Zhang, MQ (Zhang, Mengqi); Bi, CH (Bi, Chenghao); Xia, YX (Xia, Yuexing); Sun, XJ (Sun, Xuejiao); Wang, XY (Wang, Xingyu); Liu, AQ (Liu, Aqiang); Tian, SY (Tian, Shuyu); Liu, XF (Liu, Xinfeng); de Leeuw, NH (de Leeuw, Nora H.); Tian, JJ (Tian, Jianjun)

Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION DOI: 10.1002/anie.202300149 Early Access Date: FEB 2023

Abstract: Perovskite colloidal quantum wells (QWs) are promising to realize narrow deep-blue emission, but the poor optical performance and stability suppress their practical application. Here, we creatively propose a water-driven synthesis strategy to obtain size-homogenized and strongly confined deep-blue CsPbBr3 QWs, corresponding to three monolayers, which emit at the deep-blue wavelength of 456 nm. The water controls the orientation and distribution of the ligands on the surface of the nanocrystals, thus inducing orientated growth through the Ostwald ripening process by phagocytizing unstable nanocrystals to form well-crystallized QWs. These QWs present remarkable stability and high photoluminescence quantum yield of 94 %. Furthermore, we have prepared light-emitting diodes based on the QWs via the all-solution fabrication strategy, achieving an external quantum efficiency of 1 % and luminance of 2946 cd m(-2), demonstrating state-of-the-art brightness for perovskite QW-based LEDs.

Accession Number: WOS:000928994200001

PubMed ID: 36692366

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Tian, Jianjun         A-8647-2013         0000-0002-4008-0469

ISSN: 1433-7851

eISSN: 1521-3773

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/anie.202300149