Halide perovskite nanocrystals combine bright, spectrally narrow, and compositionally tunable emission with low-temperature solution processing, making them attractive building blocks for next-generation optoelectronic and photonic materials. However, their practical use remains limited by environmental instability, ion migration, and the difficulty of controlling nanocrystal formation and organization across length scales. In this talk, I will discuss how polymer-based strategies can address these challenges by turning the polymer environment from a passive host into an active design element for synthesis, stabilization, and functionality.

I will first present our work on block-copolymer micelles as nanoscale reactors for the synthesis of lead halide perovskite nanocrystals [1]. In these systems, the polymer shell confines nanocrystal growth while simultaneously protecting the perovskite core from moisture-induced degradation and suppressing halide ion migration. Building on this concept, I will discuss how stability-optimized perovskite nanocrystals can be used to study and exploit energy transfer in hybrid nanocrystal assemblies [2], highlighting the role of nanoscale spacing, encapsulation, and optical coupling.

The second part of the talk will focus on translating these concepts into thin-film emitters. By combining block-copolymer-templated nanocrystal synthesis with post-synthetic treatment and UV-induced cross-linking, we recently demonstrated stable red, green, and blue perovskite nanocrystal films [3]. Cross-linking the polymer matrix renders the films insoluble and strongly suppresses halide interdiffusion while preserving the optical properties of the embedded nanocrystals, enabling multicolor and white-light-emitting all-perovskite nanocrystal films.

Finally, I will discuss our recent efforts to understand the formation of block-copolymer-encapsulated MAPbBr₃ nanocrystals using in situ optical spectroscopy and structural characterization [4]. These studies provide insight into how precursor chemistry, polymer confinement, and growth dynamics determine the final optical properties of the hybrid material.

Together, these results establish polymer-controlled perovskite nanocrystals as a versatile platform in which synthesis, stability, energy transfer, and film processing can be engineered through the nanocrystal–polymer interface. This approach offers general design principles for robust, solution-processable nanomaterials for light emission, photonics, and integrated optoelectronic devices.