Reversible light-mediated compositional and structural transitions between CsPbBr3 and CsPb2Br5 nanosheets

Shen, Wei; Ruan, Longfei; Shen, Zhitao; Deng, Zhengtao

doi:10.1039/c8cc00139a

Cited by 59 publications

(58 citation statements)

References 31 publications

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“…In addition to the ligand‐assisted phase transition, some other factors can also lead to the solid‐state phase change in halide PNCs, i.e., light, [ 38 ] pressure, [ 39 ] heat, [ 40 ] and water. [ 41 ] Shen et al monitored the dynamic process of the light‐induced phase transition from tetragonal CsPb 2 Br 5 to orthorhombic CsPbBr 3 upon continuous illumination.…”

Section: Phase Transitionsmentioning

confidence: 99%

Halide Perovskite Nanocrystal Emitters

Liu

Grandhi

Matta

et al. 2021

Advanced Photonics Research

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The increasing attention on halide perovskite nanocrystals (PNCs) stems from their outstanding optoelectronic properties, especially the intriguing photoluminescence (PL) features. The high photoluminescence quantum yields (up to unity) of PNCs, and the tunability of their optical bandgaps by composition engineering and quantum confinement effects, account for the demonstrated great potential in several optoelectronic applications, such as light‐emitting diodes (LEDs), phosphors, lasers, and photodetectors. However, despite the rapid growth of this research field, several questions are still left unanswered and there is room for further improving the luminescence performance, particularly for emerging lead‐free PNC compositions. Herein, the recent advances in the light emission phenomena in PNCs are discussed. A special focus is given to the correlation between PL and phase transition, the dual‐color emission, the tunability of the PL toward near‐infrared (NIR), and the thermal quenching effect. The key research findings on LEDs, the major application of perovskite‐based nanoscale emitters, are also outlined. Finally, the view on the most urgent challenges to be addressed is provided, with the intent of promoting a more profound understanding of PNC emission‐related phenomena in the future.

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Section: Phase Transitionsmentioning

confidence: 99%

Halide Perovskite Nanocrystal Emitters

Liu

Grandhi

Matta

et al. 2021

Advanced Photonics Research

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“…[29] Phase change or composition change,and as aresult, the luminescent properties change of CsPbX 3 upon different external stimuli, including water, [30,31] PbX 2 , [27,32] amines, [33][34][35] and thermal annealing, [36,37] has been demonstrated in previous reported works.H owever,i ti ss till very difficult to achieve reversible on/off of their luminescent properties. [35,38] Herein, we proposed as pace-confined strategy to achieve reversibly hydrochromic switching in luminescent emission by using CsPbX 3 NCs which were confined in ap orous silica matrix, and the reversible change between al uminescent structure (CsPbX 3 )a nd an on-luminescent structure (CsPb 2 X 5 )c ould be realized by exposing to moisture or exposing to dry air, respectively.T his is the first time to discover the hydrochromic properties of CsPbX 3 NCs.This finding may not only reveals the luminescent properties of cesium lead halide perovskites,but also shed some new light on the applications of CsPbX 3 NCs.…”

Section: Introductionmentioning

confidence: 99%

Hydrochromic CsPbBr₃ Nanocrystals for Anti‐Counterfeiting

et al. 2020

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Hydrochromic materials that can reversibly change color upon water treatment have attracted much attention owing to their potential applications in diverse fields. Herein, for the first time, we report that space‐confined CsPbBr3 nanocrystals (NCs) are hydrochromic. When CsPbBr3 NCs are loaded into a porous matrix, reversible transition between luminescent CsPbBr3 and non‐luminescent CsPb2Br5 can be achieved upon the exposure/removal of water. The potential applications of hydrochromic CsPbBr3 NCs in anti‐counterfeiting are demonstrated by using CsPbBr3 NCs@mesoporous silica nanospheres (around 100 nm) as the starting material. Owing to the small particle size and negatively charged surface, the as‐prepared particles can be laser‐jet printed with high precision and high speed. We demonstrate the excellent stability over repeated transformation cycles without color fade. This new discovery may not only deepen the understanding of CsPbX3, but also open a new way to design CsPbX3 materials for new applications.

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“…Even incident light had resulted in compositional and structural transition from orthorhombic CsPbBr 3 to tetragonal CsPb 2 Br 5 NSs and vice versa. 20 To the best of the authors’ knowledge there are no reports where the compositions as well as morphology are tailored simultaneously in an anion exchange reaction.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-Induced Anion Exchange and Morphological Evolution for Composition-Controlled Caesium Lead Halide Perovskites with Tunable Optical Properties

2019

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Environmentally stable lead halide perovskite nanostructures with engineered composition and morphology are attractive because of their exotic optical properties. Here, we report the synthesis of monodispersed (∼20 nm) CsPbI 3 cubic perovskite nanocrystals (NCs) using edible olive oil as a solvent as well as a chelating reagent. Thereafter, bromide anion exchange reaction using the cetyl trimethyl ammonium bromide surfactant in hexane is carried out at relatively lower temperatures to synthesize caesium lead halide perovskites with variable halide compositions and tunable band gaps. Interestingly, because of the formation of micelles, continuous morphology evolution varying from NCs of different sizes to nanowires (NWs) and nanosheets is observed. The anion exchange temperature has a distinct effect on the morphology of the CsPbBr 3 nanostructure and the anion exchange reaction rate. Finally, an easy solution-processed photoconductive device is demonstrated using as-grown CsPbBr 3 NWs, indicating its potential for optoelectronic applications.

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Reversible light-mediated compositional and structural transitions between CsPbBr₃ and CsPb₂Br₅ nanosheets

Cited by 59 publications

References 31 publications

Halide Perovskite Nanocrystal Emitters

Halide Perovskite Nanocrystal Emitters

Hydrochromic CsPbBr₃ Nanocrystals for Anti‐Counterfeiting

Surfactant-Induced Anion Exchange and Morphological Evolution for Composition-Controlled Caesium Lead Halide Perovskites with Tunable Optical Properties

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Reversible light-mediated compositional and structural transitions between CsPbBr3 and CsPb2Br5 nanosheets

Cited by 59 publications

References 31 publications

Halide Perovskite Nanocrystal Emitters

Halide Perovskite Nanocrystal Emitters

Hydrochromic CsPbBr3 Nanocrystals for Anti‐Counterfeiting

Surfactant-Induced Anion Exchange and Morphological Evolution for Composition-Controlled Caesium Lead Halide Perovskites with Tunable Optical Properties

Contact Info

Product

Resources

About

Reversible light-mediated compositional and structural transitions between CsPbBr₃ and CsPb₂Br₅ nanosheets

Hydrochromic CsPbBr₃ Nanocrystals for Anti‐Counterfeiting