Effects of ambient exposure on photoluminescence of Dion–Jacobson tin-based halide perovskites

Abstract

Tin-based halide perovskite materials are of interest for light-emitting applications due to their broad yellow emission, but they are known to exhibit inferior stability compared to the lead-based perovskites due...

Fine-Tuning Optoelectronic Features in Organic–Inorganic Hybrid Metal Halides: A Focus on the Phenylbutanammonium Series

“…This exothermic peak may result from a structural phase change, transforming layered [SnBr 4 ] 2– into chain or isolated structures. The endothermic peak may arise from the loss of some weight. , …”

“…The endothermic peak may arise from the loss of some weight. 16,22 The absorption spectrum of (PBA) 2 MnBr 4 (H 2 O) 2 exhibited three distinct peaks at 222, 266, and 324 nm (Figure 2d). The optimum excitation for (PBA) 2 MnBr 4 (H 2 O) 2 is located at 362 nm.…”

Spectral Downshifting and Passivation Effects Using 2D Perovskite (OAm)2SnBr4 Films to Enhance the Properties of Si Nanowire Solar Cells

“…There is a great potential toward replacing Pb with Sn in perovskite materials, a step toward overcoming the toxicity of Pb ions. However, the stability of Sn 2+ is still under concern. , Recently, two-dimensional (2D) layered tin-halide perovskites have attracted the attention of researchers owing to their distinct optical and electronic properties, such as high quantum yield, large Stokes shift, and high carrier mobility, − which make these materials potential candidates in spectral downshifting. In contrast to their 3D counterparts, the organic Ruddlesden-Popper 2D perovskites comprise various organic spacers with long cationic chains that are hydrophobic, inhibiting moisture and oxygen ingress and improving stability by encapsulating the octahedron layers and passivating Sn sites. , Different 2D tin-halide perovskites had been synthesized in recent years with different techniques.…”

Thermal/Water-Induced Phase Transformation and Photoluminescence of Hybrid Manganese(II)-Based Chloride Single Crystals

“…Previously, most of the research focused on lead (Pb) metal halides. − However, the most serious issue lies in the toxicity of Pb. It is urgent to develop environmental-friendly lead-free metal halides with low-toxicity elements, such as copper (Cu), − tin (Sn), − antimony (Sb), , and manganese (Mn). − Among lead-free metal halides, Mn­(II)-based metal halides with a d 5 configuration that possesses the d–d transition exhibit outstanding optical characteristics. − Currently, Mn­(II)-based hybrid halides have attracted much interest due to their unique luminescent color and directly observed luminescent conversion. As we all know, Mn 2+ ions with tetrahedral coordination, in which each Mn 2+ is coordinated with four halogen (X) anions to form an [MnX 4 ] 2– tetrahedral unit, exhibit green emission due to the weak ligand/crystal field strength around Mn 2+ ions. − On the contrary, Mn 2+ ions with octahedral coordination, where each Mn is coordinated with six halogen anions to form an [MnX 6 ] 4– octahedral unit, exhibit red emission due to the strong ligand/crystal field strength surrounding Mn 2+ ions. ,− Interestingly, the coordination environment of Mn 2+ ions can be adjusted between the octahedron and tetrahedron by certain methods, such as temperature, humidity, and pressure, which leads to the variations of luminescent color of Mn­(II)-based hybrid halides. , A reversible conversion between the green emission of (C 5 H 8 N 2 ) 2 MnCl 4 (1-ethylimidazole) and red emission of C 5 H 8 N 2 (MnCl 2 ) x Cl y was demonstrated by Fu et al Zheng et al found an interesting luminescent conversion between green-emitting TMAMnCl 3 and red-emitting TMA 2 MnCl 4 (TMA = tetramethylammonium) that can be achieved by adding corresponding raw MnCl 2 or TMACl precursors .…”