Upconversion in molecular hetero-nonanuclear lanthanide complexes in solution
Richard C. Knighton, Lohona K. Soro, Alexandre Lecointre, Guillaume Pilet, Alexandra Fateeva, Laurie Pontille, Laura Francés‐Soriano, Niko Hildebrandt, Loı̈c J. Charbonnière
Abstract
Here we show that nonanuclear lanthanide complexes respresent a new class of solution state upconversion (UC) molecules. For a composition of one Tb per eight Yb the nonanuclear complexes display a very efficient UC phenomenon with Tb luminescence in the visible region upon 980 nm NIR excitation of Yb. An unprecedented value of 1.0 × 10-7 was obtained for the UC efficiency at only 2.86 W cm-2, demonstrating these new molecular complexes to be up to 26 times more efficient than the best current molecular systems, the UC being observed down to a concentration of 10 nM.
Topics & Concepts
Photon upconversionLanthanideExcitationMaterials sciencePhotochemistryChemistryOptoelectronicsDopingIonOrganic chemistryPhysicsQuantum mechanicsLanthanide and Transition Metal ComplexesMagnetism in coordination complexesLuminescence Properties of Advanced Materials