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Steady state absorption and PL spectra of thin films should be carefully treated due to the possible scattering issues (Eaton et al., J. Am. Chem. Soc. 2013, 135, 14701−14712, and Le et al., J. Am. Chem. Soc. 2018, 140, 814−826).
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The PL spectra from thin films in Figure 2 show the obvious interference from the light scattering and the excitation light (~750 nm).

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