This property has been transferred to optoelectronic devices by combining 2D HLPs with 3D perovskites. Compared with the 3D perovskite family, the large organic cations used in 2D HLPs made them highly stable against the environment. They manifest a Van der Waals gap between interdigitated organic cations, and the next-neighbor inorganic layers are half-cell shifted. To date, the Ruddlesden–Popper structures made of organic layers built by pairs of monovalent cations separating inorganic layers are among the most studied ones. The findings stimulate the development of color-tunable and switchable light emitters based on a single material.ĢD hybrid layered perovskites (2D HLPs) are extremely versatile materials in view of their outstanding defect tolerance, which allows an ample choice of combinations of organic and inorganic building blocks. The range of emission color from these materials is extended to red by efficient Mn doping that leads to an additional strong emission peak centered at 620 nm. The photophysical and structural studies indicate that the key to color switching is the formation and suppression of self-trapped excitons by the supply and removal of cations and halides in acetone. Blue- and white-emitting materials based on the choice of thiophene cation and HBr concentration in the synthesis and reversible white to blue color switching by sequential washing and precursor exposure of the fabricated samples are obtained. Herein, the optical properties of a set of single-layer thiophene-based 2D lead bromide platelets are investigated. For example, lattice distortions facilitate white emission that stems from self-trapped excitons or defects, and organic cations and halides determine structural stability and emission range. The structural flexibility of 2D-layered halide perovskites provides unprecedented opportunities for tuning their optical properties.
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