Blue light from perovskite
FSU researchers create hollow nanostructure that emits a highly efficient blue light
Biwu Ma, professor of chemistry and biochemistry, and his team at Florida State University have created a hollow nanostructure for metal halide perovskites that allows the material to emit highly efficient blue light. They published the work in the journal Science Advances.
"The fabrication of new generation colour displays and solid-state lighting requires luminescent materials and devices of the three primary colours, red, green and blue," said Ma (pictured above). "Although multiple ways of colour 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 worked with a metal halide perovskite made of caesium 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," sad Ma.
'Hollow metal halide perovskite nanocrystals with efficient blue emissions' by Michael Worku et al; Science Advances 24 Apr 2020: Vol. 6, no. 17
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