Correction to “Double Perovskite Single-Crystal Photoluminescence Quenching and Resurge: The Role of Cu Doping on Its Photophysics and Crystal Structure”

In our manuscript, we identified that the copper doping does not change the structure of Cs2AgBiBr6 double perovskite single crystals at room temperature but causes an increased NIR absorption with a photoluminescence band at 1.3 eV above 120 K. It is along these main findings that we also reported a photoluminescence peak at 0.9 eV in the pristine Cs2AgBiBr6. Additional measurements have identified that this 0.9 eV emission is a second-order diffraction peak of the main emission at 1.9 eV caused by the diffraction grating in our setup. Therefore, the origin of the 0.9 eV photoluminescence peak should be considered an experimental artifact instead of an emission stemming from deep defect levels as discussed in the manuscript. When measuring a very broad spectral range, longpass optical filters can be used to avoid artifacts due to the nonideal behavior of the diffraction grating.1 In the present work, an 850 nm long-pass filter was used to attenuate the 1.9 eV emission, resulting in absence of the 0.9 eV peak. We note that the central theme of this work regards the impact of copper doping on the structural and optical properties of Cs2AgBiBr6. Therefore, the main conclusions of the study are still intact, but the following corrections to the figures are needed. Figure 2 is adapted by replacing (a) with a measurement without the second-order diffraction peak and (b) with a schematic without the deep defect level that was accounting for the emission peak at 0.9 eV.