Bidentate Ligand-passivated CsPbI3 Perovskite Nanocrystals for Stable Near-unity Photoluminescence Quantum Yield and Efficient Red Light-emitting Diodes

Jun Pan, Yuequn Shang, Jun Yin, Michele de Bastiani, Wei Peng, Ibrahim Dursun, Lutfan Sinatra, Ahmed M. El-Zohry, Mohamed N. Hedhili, Abdul-Hamid M. Emwas, Omar F. Mohammed, Zhijun Ning, Osman Bakr

Research output: Contribution to journalArticlepeer-review

427 Scopus citations

Abstract

Although halide perovskite nanocrystals (NCs) are promising materials for optoelectronic devices, they suffer severely from chemical and phase instabilities. Moreover, the common capping ligands like oleic acid and oleylamine that encapsulate the NCs will form an insulating layer, precluding their utility in optoelectronic devices. To overcome these limitations, we develop a post-synthesis passivation process for CsPbI3 NCs by using a bidentate ligand, namely 2,2’-Iminodibenzoic acid. Our passivated NCs exhibit narrow red photoluminescence with exceptional quantum yield (close to unity) and substantially improved stability. The passivated NCs enabled us to realize red light-emitting diodes (LEDs) with 5.02% external quantum efficiency and 748 cd/m2 luminance, surpassing by far LEDs made from the non-passivated NCs.
Original languageEnglish (US)
Pages (from-to)562-565
Number of pages4
JournalJournal of the American Chemical Society
Volume140
Issue number2
DOIs
StatePublished - Dec 17 2017

Fingerprint

Dive into the research topics of 'Bidentate Ligand-passivated CsPbI3 Perovskite Nanocrystals for Stable Near-unity Photoluminescence Quantum Yield and Efficient Red Light-emitting Diodes'. Together they form a unique fingerprint.

Cite this