New structure allows metal halide perovskites to emit blue light

Florida State University (FSU) researchers have discovered a novel structure for metal halide perovskite materials that shows potential for more efficient technologies.

Professor of Chemistry and Biochemistry Biwu Ma and his team's new study explains how they created a hollow nanostructure for metal halide perovskites that would allow the material to emit a highly efficient blue light.

'The fabrication of new generation color displays and solid-state lighting requires luminescent materials and devices of the three primary colors, red, green and blue,' Ma said. 'Although multiple ways of color tuning have been demonstrated for perovskites to achieve highly efficient green and red emissions, producing efficient and stable blue emissions is not trivial. This work provides a facile technique to prepare highly efficient blue emitting thin films.'

Ma's research group at FSU has been working on the development and study of metal halide perovskites and perovskite-related materials for optoelectronics and energy applications since 2014. His team has pioneered scientific research on the structural and compositional control of metal halide perovskites and hybrids that would allow them to exhibit unique and useful properties.

In this case, researchers worked with a metal halide perovskite made of cesium lead bromide nanocrystals to build the structure. Previous nanostructures made from this material, including nanoplatelets, nanowires and quantum dots, had positive curvatures; this is the first negative curvature hollow structure of a metal halide perovskite that exhibits pronounced quantum size effects.

'We believe that our work would stimulate exploration of other nanostructures with remarkable and unique properties,' Ma said.