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(A, B) Double-logarithmic plots of upconversion emission intensity versus excitation power density (532 nm). The threshold intensity Ith for each annihilator is indicated by vertical dashed lines, and quadratic and linear slopes (solid lines) for each compound are included for facile evaluation of Ith. Individual plots have been vertically shifted for clarity purposes. (C) UC quantum yield versus excitation power density for the annihilators.
