What is it about?
Superradiance is an intriguing physical effect in which the luminescence of particles placed close to each other is accelerated because of the interactions between the particles. The similarity of particles and the way they are arranged (for example, close to each other or far, in a regular or disordered way) influences the interactions and the "strength" of superradiance. This study uses a physical model to calculate how differences in particle sizes and arrangements either enhance or quench superradiance.
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Why is it important?
Our findings identified the correlation between particle size, size dispersion, and disorder, and superradiance. This is important for guiding experimental efforts to achieve the collective interaction in real samples synthesized in the laboratory. For example, we identified that to make the strongest superradiance one has to use very small, quantum-confined perovskite nanocrystals with a caveat that they have to be identical. On the other hand, if the preparation method is not perfect, one should use large nanocrystals which are less sensitive to size-dispersion effects, and thus still may achieve superradiant light emission.
Perspectives
I hope this article will stimulate rational synthesis and assembly of nanomaterials for fundamental and applied studies of collective luminescence.
Dmitry Baranov
Lunds Universitet
Read the Original
This page is a summary of: Tuning perovskite nanocrystal superlattices for superradiance in the presence of disorder, The Journal of Chemical Physics, November 2023, American Institute of Physics,
DOI: 10.1063/5.0167542.
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