REmoval of the residual organic solvents could be attempetd under vacuuum without adding any additional solvents. This ceratinly work for hexane, while high boiling octadecene and in some way chemicaly bond ligands may need high vacuum and some heating at lower temperatures than peovskite phase change temperatures.

Utilize a non-solvent capable of precipitating nanoparticles while preserving their structural integrity. Typical non-solvents for perovskite nanoparticles include acetone, ethanol, and isopropanol. Employ a dialysis membrane with an appropriate molecular weight cutoff (MWCO) that permits the passage of small molecules, such as solvents and ligands, while effectively retaining the nanoparticles. Implement a size-exclusion chromatography column with an adequate pore size to facilitate the separation of nanoparticles from smaller molecular entities. Consider the application of shorter-chain ligands or those with alternative functional groups that can be more readily removed or exchanged without compromising the nanoparticle structure. Experiment with various washing solvents that minimize the risk of inducing phase changes; for instance, a specific mixture of hexane and ethanol may be employed for washing the nanoparticles. Following the initial purification processes, vacuum drying can be utilized to eliminate residual solvents. This technique is gentle and helps to prevent phase alterations that may arise from more aggressive drying methods.