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Efficient Light-Emitting Diodes Based on in Situ Fabricated FAPbBr3 Nanocrystals: The Enhancing Role of the Ligand-Assisted Reprecipitation Process
Abstract
In this paper, we reported the in situ fabrication of highly luminescent formamidinium lead bromide (FAPbBr 3 ) nanocrystal thin films by dropping toluene as an anti-solvent during the spin-coating with a perovskite precursor solution using 3,3-diphenylpropylamine bromide (DPPA-Br) as a ligand. The resulting films are uniform and composed of 5–20 nm FAPbBr 3 perovskite nanocrystals. By monitoring the solvent mixing of anti-solvent and precursor solution on the substrates, we illustrated the difference between the ligand-assisted reprecipitation (LARP) process and the nanocrystal-pinning (NCP) process. This understanding provides a guideline for film optimization, and the optimized films obtained through the in situ LARP process exhibit strong photoluminescence emission at 528 nm, with quantum yields up to 78% and an average photoluminescence lifetime of 12.7 ns. In addition, an exciton binding energy of 57.5 meV was derived from the temperature-dependent photoluminescence measurement. More importantly, we achieved highly efficient pure green perovskite based light-emitting diode (PeLEDs) devices with an average external quantum efficiency (EQE) of 7.3% (maximum EQE is 16.3%) and an average current efficiency (CE) of 29.5 cd A –1 (maximum CE is 66.3 cd A –1 ) by adapting a conventional device structure of ITO/PEDOT:PSS/TFB/perovskite film/TPBi/LiF/Al. It is expected that the in situ LARP process provides an effective methodology for the improvement of the performance of PeLEDs.
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Metadata
- Authors
- Han, D., Imran, M., Zhang, M., Chang, S., Wu, X.-G., Zhang, X., Tang, J., Wang, M., Ali, S., Li, X., Yu, G., Han, J., Wang, L., Zou, B., & Zhong, H.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-08-06
- Volume
- 12
- Issue
- 8
- Pages
- 8808-8816
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2887595704
- Cited by
- 298
- References
- 58
- FWCI
- 15.34
- Type
- journal article
- Language
- en
- Open access
- closed
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