All-Solution-Processed Sky-Blue Perovskite Electroluminescence Device via Integrated Supramolecular Host-Guest...

Area of Science:

• Materials Science
• Optoelectronics
• Chemical Engineering

Background:

• All-solution-processed perovskite optoelectronic devices offer scalable and sustainable manufacturing potential.
• Current limitations include performance deficits compared to vacuum-deposited devices, often due to solvent-induced damage to emissive layers during fabrication of charge transport layers.
• Specifically, nonpolar solvents used for electron transport layer (ETL) fabrication can degrade luminescence and surface morphology of sky-blue quasi-2D perovskite films by causing loss of organic ligands and additives.

Purpose of the Study:

• To develop a method for fabricating high-performance, all-solution-processed perovskite light-emitting diodes (PeLEDs).
• To overcome the challenge of solvent-induced degradation during the solution processing of ETLs on perovskite films.
• To enhance the luminescence properties and surface morphology of sky-blue perovskite films.

Main Methods:

• Development of a supramolecular host-guest complexation strategy.
• Predissolving organic ligands and additives in nonpolar solvents.
• Incorporating these pre-dissolved components directly into the ETL processing sequence.

Main Results:

• Successful fabrication of sky-blue perovskite films with preserved luminescence and morphology.
• Achieved a sky-blue perovskite LED (PeLED) with an external quantum efficiency of 14.75%.
• Reached a maximum luminance of 8740 cd m^-2.

Conclusions:

• The supramolecular host-guest complexation strategy effectively prevents solvent-induced degradation in all-solution-processed PeLEDs.
• This approach enables high-performance sky-blue PeLEDs with improved efficiency and luminance.
• The developed method offers a versatile route for manufacturing advanced, solution-processed optoelectronic devices.