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Spectrally Stable and Efficient Pure Red CsPbI3Quantum Dot Light-Emitting Diodes Enabled by Sequential Ligand Post-Treatment Strategy
- Source :
- Nano Letters; October 2021, Vol. 21 Issue: 20 p8756-8763, 8p
- Publication Year :
- 2021
-
Abstract
- Metal halide perovskites are promising semiconductors for next-generation light-emitting diodes (LEDs) due to their high luminance, excellent color purity, and handily tunable band gap. However, it remains a great challenge to develop perovskite LEDs (PeLEDs) with pure red emission at the wavelength of 630 nm. Herein, we report a spectrally stable and efficient pure red PeLED by employing sequential ligand post-treated CsPbI3quantum dots (QDs). The synthesized CsPbI3QDs with a size of ∼5 nm are treated in sequential steps using the ligands of 1-hydroxy-3-phenylpropan-2-aminium iodide (HPAI) and tributylsulfonium iodide (TBSI), respectively. The CsPbI3QD films exhibit improved optoelectronic properties, which enables the fabrication of a pure red PeLED with a peak external quantum efficiency (EQE) of 6.4% and a stable EL emission centered at the wavelength of 630 nm. Our reported sequential ligand post-treatment strategy opens a new route to improve the stability and efficiency of PeLEDs based on QDs.
Details
- Language :
- English
- ISSN :
- 15306984 and 15306992
- Volume :
- 21
- Issue :
- 20
- Database :
- Supplemental Index
- Journal :
- Nano Letters
- Publication Type :
- Periodical
- Accession number :
- ejs58035304
- Full Text :
- https://doi.org/10.1021/acs.nanolett.1c03011