Across the spectrum: Researchers find way to stabilize color of light in next-gen material

Science Daily   February 11, 2019
Color tunability has always been possible with halide perovskites, but it’s not been stable. While the bandgap can be conveniently tuned by mixing different halogen ions, mixed-halide perovskites suffer from severe phase separation under illumination. A team of researchers in the US (Florida State University, Rensselaer Polytechnic Institute) found that phase separation can be highly suppressed by embedding nanocrystals of mixed-halide perovskites in an endotaxial matrix. The tuned bandgap remains remarkably stable under extremely intensive illumination. The agreement between the experiments and a nucleation model suggests that the size of the nanocrystals and the host-guest interfaces are critical for the photo-stability. The stabilized bandgap will be essential for the development of perovskite-based optoelectronics, such as tandem solar cells and full-color LEDs…read more. Open Access TECHNICAL ARTICLE