Controlling the direction of light emission in anisotropic perovskite nanoparticles using alignment, fusing, and surface interactions
Join MIT.nano for our February seminar!
Carissa Eisler
Assistant Professor in Chemical Engineering and Bimolecular Engineering University of California Los Angeles
Date: February 23, 2026 Time: 3:00 – 4:00 PM ET Location: Grier 34-401A Reception to follow.
ABSTRACT
Next generation optoelectronic devices require extremely bright emitters with tunable properties, such as color tunability and preferential light emission angle, that can be produced at large scales. Perovskite nanocrystals (PNCs) are an excellent candidate for this challenge as they can achieve extremely high quantum yields with a wide color gamut and have demonstrated interesting quantum phenomena. Recently, the alignment electric dipoles within perovskite nanocrystal films, which governs angular light emission and energy transfer rates, was shown to be variable based on the local environment, which is unique to this class of materials.
In this talk, Eisler will describe her group’s work on exploring how surface effects and neighbor interactions are affected by assembles of CsPbBr3 nanoparticles. They synthesized films of CsPbBr3 nanocrystals and used back focal plane microscopy to quantify how structure, packing, and local environment drive the electronic transition alignments.
Eisler will show how altering the substrate from glass to a soft polymer can allow us to alter the dipole alignment in the material from vertically enhanced to a more isotropic alignment without changing the local optical effects. Then, she will show how anisotropic particle fusing can exaggerate the horizontal dipole alignment and can be used to quantify degradation kinetics. Finally, Eisler will show their developments in liquid-liquid self-assembly to achieve large, low defect assemblies of perovskite nanoplates.
By optimizing the solution volume and concentration of specific ligands in the sublayer, they can achieve large areas of edge up or face down assemblies with significantly different light emission patterns. Understanding the interplay of surface chemistry and structure will elucidate why these nanocrystals can achieve extraordinary photonic properties and allow us to design materials for next generation technologies.