Manipulating Color Emission in 2D Hybrid Perovskites by Fine Tuning Halide Segregation: A Transparent Green Emitter

Abstract

Halide perovskite materials offer an ideal playground for easily tuning their color and, accordingly, the spectral range of their emitted light. In contrast to common procedures, this work demonstrates that halide substitution in Ruddlesden–Popper perovskites not only progressively modulates the bandgap, but it can also be a powerful tool to control the nanoscale phase segregation—by adjusting the halide ratio and therefore the spatial distribution of recombination centers. As a result, thin films of chloride‐rich perovskite are engineered—which appear transparent to the human eye—with controlled tunable emission in the green. This is due to a rational halide substitution with iodide or bromide leading to a spatial distribution of phases where the minor component is responsible for the tunable emission, as identified by combined hyperspectral photoluminescence imaging and elemental mapping. This work paves the way for the next generation of highly tunable transparent emissive materials, which can be used as light‐emitting pixels in advanced and low‐cost optoelectronics.

From Bulk to Surface Passivation: Double Role of Chlorine‐Doping for Boosting Efficiency of FAPbI3‐rich Perovskite Solar Cells

“…Our surface treatment demonstrates the formation of an LDP layer, which we infer it as correlated to the Cl surface segregation observed in the ToF‐SIMS profile of FAPbI 3 (MACl) + MePEACl. [ 23 ] Concomitantly, the peak related to lead iodide at 2θ = 12.6° decreases with respect to FAPbI 3 (MACl) which suggests its incorporation in the LDP.…”

Chiral 2D organic–inorganic hybrid perovskites based on l-histidine

“…As was previously shown, the halide substitution of hybrid perovskites can progressively change their optical properties. 60 In order to demonstrate the applicability of the halide substitution strategy on histidine-based hybrid perovskites, we obtained three compounds: BrI 3 , Br 2 I 2 , and Br 3 I . Unfortunately, these mixed-halide perovskites do not form large crystals but precipitate as high-crystalline powders that are only suitable for PXRD measurements.…”

Achieving Near‐unity Photoluminescence Quantum Yields in Organic‐Inorganic Hybrid Antimony (III) Chlorides with the [SbCl5] Geometry

“…They are highly flexible with organic counterparts, [6] inorganic metals, [7] and halide components [8] . For example, hybrid lead halide perovskite materials have demonstrated highly diverse structural, optical, and electronic properties with the templating effects of organic cations and halide variations [9–11] . More recently, hybrid antimony halides have attracted increasing attention as alternatives because they are non‐toxic comparing to lead, yet maintain good stability compare to other main group metals such as Ge 2+ and Sn 2+ [9, 12–14] .…”

“…[8] For example, hybrid lead halide perovskite materials have demonstrated highly diverse structural, optical, and electronic properties with the templating effects of organic cations and halide variations. [9][10][11] More recently, hybrid antimony halides have attracted increasing attention as alternatives because they are non-toxic comparing to lead, yet maintain good stability compare to other main group metals such as Ge 2 + and Sn 2 + . [9,[12][13][14] Furthermore, Sb 3 + has dynamic lone pairs [15,16] and has been widely used as an efficient dopant in many non-emissive systems to activate photoluminescence (PL) emission.…”