Excellent long-wavelength-pass filters of CsPbBr3 and CsPb(Cl/Br)3 quantum dot glasses by a Cu2+ quenching strategy

Perovskite CsPbBr3 quantum dot (QD) glasses doping Cu2+ are reported for excellent long-wavelength-pass filters. Transmittance, optical density (OD), photoluminescence (PL), PL excitation, and PL decay are used to investigate filter properties and the quenching mechanism. At low Cu2+ molar concentrations of 0%, 0.0025%, 0.005%, and 0.01%, the filters exhibit good properties in transmittance and OD. Transition wavelengths are 518, 513, 513, and 512 nm, respectively. The shape and position of transmittance and OD are almost not changed. As Cu2+ concentration increases, PL intensity is monotonously quenched. PL decay is obviously faster. The quenching mechanism is dynamic quenching, which is electron transfer from QDs to Cu2+. In comparison with the initial intensity, the intensity decreases by factors of 7.6, 12.8, and 18.8. Oxidation and reduction atmospheres are introduced, and the dynamic quenching mechanism is further confirmed. At high Cu2+ concentrations of 0.013%-0.02%, the quenching mechanism is static quenching. Double-anion CsPb(Cl/Br)(3) QD glasses of different Cu2+ concentrations extend the operation wavelength to the blue light region. For Cu2+ concentrations of 0%, 0.005%, and 0.01%, the transition wavelengths are 470, 472, and 473 nm for CsPb(Cl/Br)(3) (NaCl as Cl source) QD glasses, and 430, 426, and 445 nm for CsPb(Cl/Br)(3) (PbCl2 as Cl source) QD glasses, respectively. (C) 2022 Optica Publishing Group

Automated summary

This study investigates the properties and quenching mechanisms of Cu2+-doped perovskite CsPbBr3 quantum dot glasses as long-wavelength-pass filters. The results show that the filters exhibit good transmittance and optical density at low Cu2+ concentrations, while the photoluminescence intensity decreases and the decay rate increases as the Cu2+ concentration increases, indicating a shift from dynamic quenching to static quenching. Furthermore, double-anion CsPb(Cl/Br)3 quantum dot glasses with different Cu2+ concentrations extend the operation wavelength to the blue light region.