Manipulating solvent fluidic dynamics for large-area perovskite film-formation and white light-emitting diodes

Guangyi Shi, Zongming Huang, Ran Qiao, Wenjing Chen, Zhijian Li, Yaping Li, Kai Mu, Ting Si and Zhengguo Xiao ()
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Guangyi Shi: University of Science and Technology of China
Zongming Huang: University of Science and Technology of China
Ran Qiao: University of Science and Technology of China
Wenjing Chen: University of Science and Technology of China
Zhijian Li: University of Science and Technology of China
Yaping Li: University of Science and Technology of China
Kai Mu: University of Science and Technology of China
Ting Si: University of Science and Technology of China
Zhengguo Xiao: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Presynthesized perovskite quantum dots are very promising for making films with different compositions, as they decouple crystallization and film-formation processes. However, fabricating large-area uniform films using perovskite quantum dots is still very challenging due to the complex fluidic dynamics of the solvents. Here, we report a robust film-formation approach using an environmental-friendly binary-solvent strategy. Nonbenzene solvents, n-octane and n-hexane, are mixed to manipulate the fluidic and evaporation dynamics of the perovskite quantum dot inks, resulting in balanced Marangoni flow, enhanced ink spreadability, and uniform solute-redistribution. We can therefore blade-coat large-area uniform perovskite films with different compositions using the same fabrication parameters. White and red perovskite light-emitting diodes incorporating blade-coated films exhibit a decent external quantum efficiency of 10.6% and 15.3% (0.04 cm2), and show a uniform emission up to 28 cm2. This work represents a significant step toward the application of perovskite light-emitting diodes in flat panel solid-state lighting.

Date: 2024
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DOI: 10.1038/s41467-024-45488-5

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