Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Semiconductor nanocrystals have recently emerged as a very promising material in many different technological applications. In particular, the use of these particles as light emitters has attracted more and more interest, but still one of the greatest challenges is the realization of highly efficient nanometric size white light emitters. Current protocols produce white light emitters with very low quantum efficiency and a fixed luminescent emission, thus making the realization of these particles still an issue.
To fill this gap we realized a new class of highly efficient white light emitting supraparticles, characterized by highly controllable emission and great synthesis reproducibility. The synthesis method is based on the self-assembly of different populations of luminescent nanocrystals into a 3D spherical supraball by using an oil-in-water microemulsion synthesis developed in our group [1]. Thanks to this synthesis method we are able to accurately control the supraparticle size from few hundred nanometers to some micrometers without losing efficiency. Concerning their optical properties, these supraparticles have already attracted interest for their remarkable collective behavior [2]. Here we show that the white light emission emerges by simply mixing different proportions of blue, green and red nanocrystals, fact that makes supraballs extremely versatile.
In this talk we will give a comprehensive presentation of these intriguing supraparticles, illustrating the synthesis method as well as the optical properties that make them so appropriate for commercial applications.
[1] de Nijs et al., Nat. Mat., 2015,14, pp 56-60
[2] Vanmaekelbergh et al., ACS Nano, 2015, 9 (4), pp 3942–3950
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