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Room-Temperature Linear Light Upconversion in a Mononuclear Erbium Molecular Complex.

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Researchers achieved visible light emission from a single molecule using near-infrared (NIR) lasers. This breakthrough in lanthanide photophysics utilizes a novel molecular design for upconversion, overcoming limitations of solid-state materials.

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erbium complexesexcited-state absorptionmolecular upconversion

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Photon upconversion typically requires low-phonon solid-state materials or nanoparticles.
  • Achieving upconversion in discrete molecular systems has been challenging.
  • Lanthanide ions are key to upconversion due to their unique electronic transitions.

Purpose of the Study:

  • To demonstrate efficient photon upconversion in a mononuclear molecular complex.
  • To explore the potential of molecular design in overcoming limitations of solid-state upconversion materials.
  • To investigate NIR-to-visible light emission from a single lanthanide complex.

Main Methods:

  • Synthesis of a mononuclear lanthanide complex featuring a nine-coordinate trivalent erbium cation.
  • Utilizing three terdentate N-donor ligands for tight helical wrapping around the erbium ion.
  • Excitation using low-power near-infrared (NIR) lasers at 801 nm and 966 nm.

Main Results:

  • Observation of unprecedented upconverted blue-green emission from the molecular complex.
  • Successful photon upconversion achieved via successive absorption of two or three NIR photons.
  • Demonstration of efficient upconversion in a molecular system, not limited to solids.

Conclusions:

  • A novel molecular design enables efficient photon upconversion in a mononuclear lanthanide complex.
  • This molecular approach offers an alternative to solid-state materials for upconversion applications.
  • The findings open new avenues for molecular photonics and optoelectronics.