Organic−Inorganic Layered and Hollow Tin Bromide Perovskite with Tunable Broadband Emission

Abstract

Recently, layered perovskites attracted great attention for its excellent stability and light-emitting property. However, most of them rely on the toxic element lead and their emission quantum yields are generally low. Here, a unique hollow two-dimensional perovskite was developed in which the organic hexamethylene diamines (CHN) strongly coupled with distorted tin bromide anions (SnBr). This toxic-free low-dimensional tin perovskite exhibits a broadband emission in the visible region with a high luminescence quantum yield of 86%. First-principles calculation indicate the broadband emission is associated with the recombination of self-trapped excitons. And the emission is related to the geometry of tin bromide anions. An ultraviolet light-pumped white light emitting diode with excellent color-rendering index of 94 was fabricated using it together with a commercially available blue phosphor.

Exploring Organic Metal Halides with Reversible Temperature‐Responsive Dual‐Emissive Photoluminescence

“…According to a previous report, the extraordinary acceleration in radiative decay rates for the iodide‐based complexes compared to chloride‐based counterparts are attributed to either enhanced spin‐orbital coupling, owing to the heavier halide, or to the stronger covalency in the Mn−X interaction for the heavier halides . In contrast, the TRPL lifetime for the emission at 672 nm shows a single‐exponential decay of around 22.5 μs at 290 K, which increased significantly to milliseconds range at 80 K fitted by three triplet lifetime components (Figure e, f), which agrees well with reported values for STEs in low‐dimensional metal halides, providing direct evidence that STEs contribute to the broad red emission …”

Air‐Stable, Lead‐Free Zero‐Dimensional Mixed Bismuth‐Antimony Perovskite Single Crystals with Ultra‐broadband Emission

“…ThePLprobed at 640 nm associated with the new generated STEs can be fitted by double-exponential to yield as hort lifetime of 12.3 ns,w hich is assigned to the spin-singlet STEs,a nd am uch longer lifetime of 234.5 ns, which is ascribed to the spin-triplet STEs. [16,32] And the proportion of the contribution of spin-triplet STEs is ca. 18 %.…”

Metal Halide Perovskite Light‐Emitting Devices: Promising Technology for Next‐Generation Displays

“…Tang and co‐workers reported lead‐free organic–inorganic MA 3 Bi 2 X 9 QDs with PLQY of 12% and all inorganic Cs 3 Sb 2 X 9 QDs with PLQY of 46% . Recently, high PLQY of 86% has been demonstrated by Fu et al for 2D layered HDM 3 SnBr 8 perovskites, but the emission peak centered at around 600 nm was very broad …”