Moisture-Dependent Blinking of Individual CsPbBr₃ Nanocrystals Revealed by Single-Particle Spectroscopy

Ultrawide UV to NIR Emission in Double Perovskite Nanocrystals via the Self-Trapping State Engineering Strategy

“…The effects of different concentrations of Ag + doping on the lattice and phase were first discussed. Figure b shows the X-ray diffraction (XRD) patterns of undoped and Ag-doped Cs 2 NaBiCl 6 NCs, which are in good agreement with the previously reported results . It was found that the doping concentrations had nearly no substantial effect on the crystalline form of the Cs 2 NaBiCl 6 nanocrystals.…”

“…Figure 1b shows the Xray diffraction (XRD) patterns of undoped and Ag-doped Cs 2 NaBiCl 6 NCs, which are in good agreement with the previously reported results. 8 It was found that the doping concentrations had nearly no substantial effect on the crystalline form of the Cs 2 NaBiCl 6 nanocrystals. Furthermore, the rare earth ions, Nd and Ag ions, were doped into Cs 2 NaBiCl 6 nanocrystals, and the effects on the lattice and photoluminescence properties were investigated.…”

“…Lead halide perovskite nanocrystals have attracted much attention due to their excellent photoelectric properties. , However, low stability and high toxicity have been the limiting factors for large-scale commercial application of lead halide perovskite nanocrystals. − Therefore, Hao et al and Krishnamoorthy et al attempted to replace Pb 2+ with bivalent Sn 2+ and Ge 2+ , respectively. However, Sn 2+ and Ge 2+ perovskite NCs are highly unstable in air and are easily oxidized to tetravalent Sn 4+ and Ge 4+ states.…”

Nuclear Quantum Effects Accelerate Charge Recombination but Boost the Stability of Inorganic Perovskites in Mild Humidity

“…16 Similarly, Hong et al confirmed that a 40% humidity atmosphere facilitates the enhancement of the performance of all-inorganic perovskites. 17 Li et al demonstrated that both the crystallinity and the photoelectronic performance of CsPbI 3−x Br x (x < 1) can be effectively controlled by the appropriate moisture treatment. 18 However, the effect of moisture on perovskites also has a negative side.…”

Simultaneous Photoluminescence and Photothermal Investigation of Individual CH3NH3PbBr3 Microcrystals

“…Metal halide perovskite materials show very promising applications in the field of photovoltaic and light-emitting devices and have become one of the hottest materials during the past decade. − Enormous attention has been attracted from academia and industry due to their excellent optical properties, such as a tunable direct band gap, − high absorption coefficient, − and long carrier diffusion lengths. − In addition to the great achievement in applications, a great process has also been obtained in understanding the fundamental photophysical mechanism of these materials. − Photoluminescence (PL) is directly related to the concentration of photogenerated carriers in perovskite crystals, and many photophysical properties and related dynamic processes can be explored by monitoring the PL of perovskite crystals. − Normally, the increase in PL is attributed to passivation of the charge trap responsible for PL quenching, , while PL blinking is considered to be the result of switching between the active and inactive states. , Other factors have shown a significant effect on the PL properties, including crystal size , and atmosphere, which are usually related to the physical adsorption or photochemical reaction of gas molecules. − However, to obtain the above conclusions, the basic assumption is that the absorption of perovskite materials is constant, which has not been solidly proven. Simultaneous detection of the emission and absorption of a single perovskite crystal will provide the possibility to solve this problem and directly prove the above-mentioned mechanisms.…”