Stable cyan and white light-emitting diodes enabled by branched cations sterically stabilized 2D/3D perovskites

Composition and structure regulation of Ruddlesden–Popper perovskite for light-emitting diodes applications

“…It has been reported that mixed 2D/3D perovskites can show high electrical and photo efficiency for both, high-property photovoltaic [80][81][82][83][84][85][86][87] and LEDs. 9,15,71,74,[88][89][90] Using BA as a spacer to form RP perovskite BA 2 Cs nÀ1 Pb n (Br/X) 3n+1 (X = Cl, I) from inorganic CsPb(Br/X) 3 (X = I or Cl), the number of planes of CsPbBr 3 in the structure is around B24 AE 7. 15 These large n-value materials show that quasi-2D/3D structures can balance the thin emission line width and high QY of thin nanosheets with the superior conduction properties of thicker perovskite crystals.…”

“…The 2D/3D mixed perovskite trimethylsilyl methylamine (TmMA)-modified MA x DMAPbBr 3+x was formed by adding branched cation (TmMA + ). 88 Introducing DMA and TmMA cations could blueshift the emission PL to cyan emission and enhance stability. A vacuum quenching process has been used to obtain dense and uniform perovskite thin films with efficient energy funneling among the evenly-distributed 2D and 3D phases.…”

“…The 2D/3D mixed perovskite trimethylsilyl methylamine (TmMA)-modified MA x DMAPbBr 3+ x was formed by adding branched cation (TmMA + ). 88 Introducing DMA and TmMA cations could blueshift the emission PL to cyan emission and enhance stability.…”

Recent Progress and Prospects on Metal Halide Perovskite Nanocrystals as Color Converters in the Fabrication of White Light-Emitting Diodes

“…It is being noticed that a high CRI value (93) and a lower CCT value (3018 K) were obtained for DA-capped CsPbBr 3 . Later, Shen et al reported a WLED based on a cyan-emitting (trimethylsilyl) methylamine (TmMA)-modified (MA) x (DMA)PbBr 3+x lowerdimensional perovskite with cyan emission (Shen et al, 2021). They achieved a QY up to ~87.8%.…”

Temperature-Dependent Reversible Optical Properties of Mn-Based Organic–Inorganic Hybrid (C8H20N)2MnCl4 Metal Halides

“…Organic–inorganic metal halides (OIMHs) are semiconductor materials with fascinating optical properties, including large absorption coefficient, high charge carrier mobility, high photoluminescence quantum yield (PLQY), and the simplicity and affordability of fabrication. − In contrast to all-inorganic metal halides, OIMHs have richer combination forms due to the variety of organic cations in molecular configurations. In addition to organic cations, metal ions for building a sublattice of OIMHs also have many choices, for instance, metal ions with ns 2 electronic configuration such as Pb 2+ , Sn 2+ , In 3+ , Bi 3+ , Sb 3+ , and so forth, and transition metal ions such as Cd 2+ , Cu + , Mn 2+ , and so forth. − This variety of combinations also provides rich crystal structures from zero dimension (0D) to three dimension (3D), and some with reduced dimensionality have been widely studied for their good stability and superior optical properties . Limited by the toxicity of lead-based compounds, lead-free manganese (Mn)-based OIMHs with excellent stability have attracted more attention.…”