Redefining near-unity luminescence in quantum dots with photothermal threshold quantum yield

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Science  15 Mar 2019:
Vol. 363, Issue 6432, pp. 1199-1202
DOI: 10.1126/science.aat3803

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Superefficient light emission

A challenge to improving synthesis methods for superefficient light-emitting semiconductor nanoparticles is that current analytical methods cannot measure efficiencies above 99%. Hanifi et al. used photothermal deflection spectroscopy to measure very small nonradiative decay components in quantum dot photoluminescence. The method allowed them to tune the synthesis of CdSe/CdS quantum dots so that the external luminescent efficiencies exceeded 99.5%. This is important for applications that require an absolute minimum amount of photon energy to be lost as heat, such as photovoltaic luminescent concentrators.

Science, this issue p. 1199