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Triplet state brightens upconversion

Efficient photon upconversion is desired for applications ranging from molecular sensing to solar-energy harvesting. Now, the population of hidden triplet state electrons, created on dye antennas and rare-earth-doped nanoparticles, has been amplified to brighten upconversion by five orders of magnitude.

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Fig. 1: Schematic of a triplet-state-assisted dye-sensitized upconversion nanoparticle system.


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Correspondence to Jiajia Zhou or Dayong Jin.

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Zhou, J., Jin, D. Triplet state brightens upconversion. Nature Photon 12, 378–379 (2018).

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