Efficient White-Light Emission in Non-Toxic One-Dimensional Perovskites

• Applicants: Professor Dr. Sangam Chatterjee; Dr. Johanna Heine
• Subject Area: Experimental Condensed Matter Physics ; Solid State and Surface Chemistry, Material Synthesis
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 531281367

Lighting consumes 1805 TWh or 7% of the global electricity consumption. Single materials with efficient and stable intrinsic white-light emission are ideal for lighting applications, but spectrally-broad photon emission in a single material is rare. Organic-inorganic metal-halide perovskites generate vast research interest for their outstanding optoelectronic properties and potential for optical applications. They exhibit spectrally-broad white-light emission from self-trapped excitons that originate from lattice distortion in the excited state. However, the most-studied and most-efficient perovskite materials include lead, which is a neuro-toxic heavy metal, and they degrade in the environment from moisture, oxygen, light illumination, and elevated temperatures. Further, the relation between structural factors and white-light emission is unclear. This project aims to reveal the structure relation and dynamics of self-trapped excitons in novel one-dimensional perovskite derivatives, realize electrical injection of charge carriers and harness them in a white-light emitter. We will assemble an interdisciplinary team from inorganic chemistry and experimental semiconductor physics to synthesize antimony- and bismuth-based one-dimensional perovskite single crystals, contribute to the clarification of the structure-property relationship, and devise guiding principles towards optimized perovskite-based white-light emitters. This includes optimized long-term and operational stability as well as optimal quantum efficiency. Ultimately, we will build an optimized white-light emitter. The knowledge generated in this project will help the scientific community to advance perovskite-based, environmentally-friendly and energy-efficient solid-state lighting devices.

• DFG Programme: Research Grants
• International Connection: Japan
• Cooperation Partner: Professor Dr. Hirokazu Tada