Transition Metal Complexes as Photosensitizers for Near-Infrared Lanthanide Luminescence

Abstract

Energy transfer (ET) from ferrocene or ruthenium tris(bipyridine) functionalized light‐harvesting units allows the first observation of sensitized near‐infrared (NIR) lanthanide (Ln) luminescence (Lum.; see scheme, Exc.=excitation). Since the donating triplet state of the ruthenium tris(bipyridine) antenna is luminescent, the sensitization process could be studied in detail.

Synthesis, structure and near-infrared (NIR) luminescence of three solvent-induced pseudo-polymorphic complexes from a bimetallic Zn–Nd Schiff-base molecular unit

“…It is noteworthy that almost identical emission character (relative intensities at 863, 1060 and 1328 nm or esti- mated maximum U of 0.08) for complexes 1-3 in dilute solution is observed with their concentrations adjusted to give the same absorbance values at 337 nm. Due to the limitation of our equipment, the excitation spectra, and the NIR luminescent lifetime could not be measured, while the maximum possible quantum yield in solution was estimated using comparative methods as described by van Veggel and co-workers [10]. The free H 2 L ligand and ZnL precursor do not exhibit NIR luminescence under the same condition.…”

Infrared Lasers in Nanoscale Science

“…PUNPs made from NaYF 4 :Yb 3+ ,Er 3+ have been recognized as one of the most efficient photon upconverting phosphors [30] .…”

“…M-540 is a molecule that can produce singlet oxygen and other reactive oxygen species, and has been used before in photodynamic therapy as a photosensitizer with a visible light source. Both the emission spectrum of NaYF 4 :Yb 3+ ,Er 3+ nanoparticles and the absorption spectrum of M-540 show a good overlap between the nanoparticles' emission and M-540's absorption [30] . The photon upconverting property of the nanoparticles was not affected by the silica coating, as confirmed by their photoluminescence spectrum.…”

Cyclometalated platinum(II) complex with C^N^N tridentate ligand as sensitizer for lanthanide luminescence

“…In order to overcome the weak intensities of the f-f electronic transitions for the lanthanide(III) complexes, energy transfer from transition metal based 3 MLCT excited states of the light-harvesting antenna chromophores to f-f levels of the lanthanide ions have been widely applied to achieve long-lived lanthanide emission [4][5][6][7][8]. Current efforts are focused to further optimize the energy transfer process in d-f bimetallic complexes and extend the excitation wavelength throughout the visible and even into the NIR region [9-12].…”