General Mild Reaction Creates Highly Luminescent Organic-Ligand-Lacking Halide Perovskite Nanocrystals for Efficient Light-Emitting Diodes.

Bin-Bin Zhang, Shuai Yuan, Ju-Ping Ma, Yang Zhou, Jingshan Hou, Xueyuan Chen, Wei Zheng, Huaibin Shen, Xue-Chun Wang, Baoquan Sun, Osman Bakr, Liang-Sheng Liao, Hong-Tao Sun

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

The presence of labile bulky insulating hydrocarbon ligands in halide perovskite nanocrystals (NCs) passivates surface traps but concurrently makes charge transport difficult in optoelectronic devices. Early efforts routinely rely on the replacement of long-chain ligands with short-chain cousins, leading to notable changes in NC's sizes and photophysical properties and thus making it hard to obtain devices with nearly designed emissions. Here we report a general solution-phase ligand-exchange strategy to produce organic-ligand-lacking halide perovskite NCs with high photoluminescence (PL) quantum yields and good stability in ambient air. We demonstrate that the ligand exchange can be achieved by a well-controlled mild reaction of thionyl halide with the carboxylic and amine groups on the NC's surface, resulting in nearly dry NCs with well-passivated surfaces and almost unaltered emission characteristics. Consequently, we achieve exceptionally high-performance blue perovskite NC light-emitting diodes (LEDs) with an external quantum efficiency of up to 1.35% and an extremely narrow full width at half-maximum of 14.6 nm. Our work provides a systematic framework for preparing high-quality organic-ligand-lacking perovskite NC inks that can be directly cast as films featuring effective charge transport, thereby providing the foundation for further development of a wide range of efficient perovskite optoelectronic devices.
Original languageEnglish (US)
Pages (from-to)15423-15432
Number of pages10
JournalJournal of the American Chemical Society
Volume141
Issue number38
DOIs
StatePublished - Sep 11 2019

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