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Keywords:

  • helical structures;
  • lanthanides;
  • photochemistry;
  • self-assembly;
  • upconversion
Thumbnail image of graphical abstract

Giving the green light: The connection of two CrIII sensitizers around a central ErIII acceptor in a self-assembled cation provides high local metal concentrations that favor efficient nonlinear energy transfer upconversion luminescence (see picture). Upon selective low-energy near-infrared irradiation of CrIII-centered transitions, 1 displays an unprecedented molecular two-photon upconverted green ErIII-centered emission.