Due to their high carrier mobility, tunable bandgaps, narrow emission linewidths and solution-processability, metal halide perovskites demonstrate exceptional promise in photovoltaics, optoelectronics and photodetection. But the toxicity of lead has hindered its practical applications significantly. A series of lead-free perovskites materials have received great attention from researchers, there remains substantial scope for advancing research into the narrowband tunability of such lead-free perovskite materials compared to CsPbBr3. Bromo‑manganese cesium perovskites can achieve red and green luminescence, but there are still unsatisfactory luminescence efficiency, poor stability, limited green light tunability, and the mechanism by which alkali metal ion doping affects the regulation of energy level splitting by the manganese crystal field remains unclear. This study prepares Cs3MnBr5 via thermal injection. A-site doping (partially substituting Cs with Na, K ions) preserves its crystal structure. Doping with Na+ and K+ enhances the luminescence intensity of the material and enables effective spectral modulation, while also providing insights into the underlying mechanism. Specifically, modifications to the lattice structure tune the electronic properties, induce splitting of the Mn2+ energy levels, and increase the splitting energy of the 3d orbitals. The energy required for the electronic transition from the 4T1(G) state to the (Wang et al., 20246)A1(S) energy level increases, leading to the occurrence of a blue shift and achieving the spectral tunability within the green light range. Silicon solar cells exhibit enhanced power conversion efficiency (PCE) when undoped Cs3MnBr5 and Na/K-doped Cs3MnBr5 are employed as the down-conversion layer. Thus, this material exhibits broad application prospects in lighting, display technology, optoelectronic devices, biomedical.
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