Bidentate Ligand-passivated CsPbI3 Perovskite Nanocrystals for Stable Near-unity Photoluminescence Quantum Yield and Efficient Red Light-emitting Diodes
de Bastiani, Michele
El-Zohry, Ahmed M.
Hedhili, Mohamed N.
Emwas, Abdul-Hamid M.
Mohammed, Omar F.
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
KAUST Catalysis Center (KCC)
Imaging and Characterization Core Lab
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AbstractAlthough 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.
CitationPan J, Shang Y, Yin J, De Bastiani M, Peng W, et al. (2017) Bidentate Ligand-passivated CsPbI3 Perovskite Nanocrystals for Stable Near-unity Photoluminescence Quantum Yield and Efficient Red Light-emitting Diodes. Journal of the American Chemical Society. Available: http://dx.doi.org/10.1021/jacs.7b10647.
SponsorsThe authors acknowledge funding support from KAUST. Ning, Z. J. and Shang Y. Q. acknowledge financial support from the Shanghai International Cooperation Project (16520720700), National Key Research and Development Program of China (under Grants No. 2016FYA0204000), and Shanghai key research program (16JC1402100).
PublisherAmerican Chemical Society (ACS)