Ytterbium complex of 1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane was assembled with several chlorophyll derivatives bearing a carboxy group in organic solvents. Visible-light sensitization of specific chlorophylls caused a rise of near-infrared emission from Yb3+, due to triplet excited energy transfer in a supramolecule.