Erratum: Near-infrared-to-visible photon upconversion sensitized by a metal complex with spin-forbidden yet strong S₀-T₁ absorption (Journal of the American Chemical Society (2016) 138:28 (8702-8705) DOI: 10.1021/jacs.6b04692)

In the original paper, the absolute upconversion (UC) quantum yield φ_UC' of D1-rubrene in poly(vinyl alcohol) (PVA) film was measured by using an absolute quantum yield measurement setup specially built by Hamamatsu Photonics. The instrument was calibrated by Hamamatsu Photonics before filters for other excitation wavelengths, such as 532 nm, were confirmed to be right in the original instrument. Thus, the quantum yield data in other papers using different excitation wavelengths are uninfluenced by the default setting of the 730 nm short-pass filter. The accuracy of this reinspected optical shipping, including the integrating sphere and the 680 nm shortpass filter that was used to reduce the intensity of scattered excitation light (λ_ex = 730 nm). Later we installed another absolute quantum yield measurement system (Quantaurus-QY Plus C13534-01, Hamamatsu Photonics) and measured the same sample but could not reproduce the original UC quantum yield. Close inspections unveiled that the optical density (2.7) of the short-pass filter at this excitation wavelength (730 nm) configured in the original instrument was smaller than the correct value (3.4).¹ Note that the optical densities of other density was verified by observing similar absolute UC quantum yields of palladium(II) octabutoxyphthalocyanine (20 μM)- rubrene (10 mM) in deaerated THF with (0.36%) and without (0.34%) the short-pass filter at an excitation intensity of 24 mW cm^-2. Figure 3h has been corrected by using the correct optical density. The correct absolute UC quantum yield φ_UC' of D1- rubrene in PVA film is smaller (0.43%) than the one in the original report (3.1%). This correction does not affect the main claim of the original paper, NIR-to-visible triplet-triplet annihilation-based upconversion sensitized by the metal complex with S₀-T₁ absorption (Figure presented).