Low-dimensional iodide perovskite nanocrystals enable efficient red emission

Abstract

We report herein a simple ligand-assisted reprecipitation method at room temperature to synthesize mixed-cation hybrid organic–inorganic perovskite nanocrystals with low structural dimensionality.

Engineering Sr-doping for enabling long-term stable FAPb1−xSrxI3 quantum dots with 100% photoluminescence quantum yield

“…2b, while well-defined peaks at low angles appear in the XRD profiles of the redispersed precipitates, for a nominal Sr precursor ratio higher than 0.5, confirming the NPL crystalline nature observed by TEM. 43,49 To determinate the number of layers contained in the NPLs, the n value from the Ruddlesden-Popper structures was calculated. The XRD peaks of each sample follow periodic small angle intervals, associated with nanoplatelet stacking.…”

“…43,50 Consequently, the thickness of the inorganic framework, excluding the long organic chains of the OLAm, of the FAPb 0.88 Sr 0.12 I 3 and FAPb 0.94 Sr 0.06 I 3 NPLs is calculated as 1.5 nm and 1.2 nm thick, respectively. The FAPb 0.94 Sr 0.06 I 3 NPLs structure is the same as that for the Ruddlesden-Popper (OLAm) 2 (FA)Pb 2 I 7 perovskite (n = 2), 49,51 even if we do not discard the mixture of 2D structures with different ''n'', since the optical features of the colloidal solutions and precipitates at least suggest the formation of two The increase of the nominal Sr precursor fraction significantly impacts the chemical environment of FAPb 1Àx Sr x I 3 , as it has been analyzed by X-ray photoelectron spectroscopy (XPS) (Fig. S7a and b S2 and S3 (ESI †), respectively.…”

Controllable synthesis of CsPbI3 nanorods with tunable photoluminescence emission

“… 10–13 Among them, iodide perovskite nanocrystals have attracted great attention due to the unique narrow band gap and tunable efficient red emission. 14,15 More noteworthy is the one-dimensional (1D) CsPbI 3 nanocrystals with a particular crystallographic direction. Different from other structures and compositions of inorganic perovskite nanocrystals, 1D CsPbI 3 nanocrystals have fewer grain boundaries, limits carrier transport area and shortens the carrier transport distance, which provides conditions for the generation of high-efficiency optoelectronic devices.…”

Low‐Dimensional‐Networked Perovskites with A‐Site‐Cation Engineering for Optoelectronic Devices

“…Photoemission peaks at 643, 662, 683, and 743 nm was achieved with the 2NCs for different long organic ammonium cations of hexyl, octyl, decyl, and oleyl ammonium, respectively. [ 96 ] Analysis of the size effects of these A‐site cations in the 2DN RPPs (HA) 2 (A)Pb 2 I 7 (HA = n‐hexylammonium), Hautzinger et al. revealed a parabolic trend of the optical band gap of the LDN perovskite NCs versus A‐site cation size.…”

“…[ 98–112 ] Similar to the bulk phase, the LDN perovskite NCs also show superior stability to 3DN perovskites. [ 95,96 ]…”