Polar-Solvent-Free Synthesis of Highly Photoluminescent and Stable CsPbBr<sub>3</sub> Nanocrystals with Controlled Shape and Size by Ultrasonication

Rao, Longshi; Tang, Yong; Song, Cun-Jiang; Xu, Ke; Vickers, Evan T.; Naghadeh, Sara Bonabi; Ding, Xinrui; Zhang, Jin Z.

doi:10.1021/acs.chemmater.8b03298

Cited by 73 publications

(83 citation statements)

References 68 publications

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“…In summary, we demonstrate the effect of small changes in the environment of capping ligands and water on the crystal structure and stoichiometry of PNCs. This study expanded our recent work of synthesizing differently shaped CsPbBr 3 PNCs [30]. Similarly as demonstrated in our recent study, by changing the ultrasound power and radiation time, the PL emission of CsPbBr 3 PNCs could be easily tuned.…”

Section: Resultssupporting

confidence: 73%

“…2 and Fig. 2, when the radiation time is increased, both the UV–vis absorption and PL spectra are red-shifted, we suggest that it is the size effect that is dominant over ionic bond strength in causing the spectral shift, which is different from the effects of radiation time that we observed recently [30]. This phenomenon indicates that the immersion height of the vibrating spear would affect PNCs properties.…”

Section: Resultsmentioning

confidence: 58%

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Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

Rao¹,

Ding²,

Du³

et al. 2019

Beilstein J. Nanotechnol.

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We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3 PNCs and Cs4PbBr6 PNCs exhibit different optical properties that depend on their morphology, size, and structure. The photoluminescence (PL) emission and quantum yield (QY) of the CsPbBr3 PNCs can be tuned by changing the ultrasound power, radiation time, and the height of the vibrating spear. The optimized CsPbBr3 PNCs show a good stability and high PL QY of up to 85%. In addition, the phase transformation between CsPbBr3 PNCs and Cs4PbBr6 PNCs can be obtained through varying the amount of oleylamine (OAm) and water. The mechanism of this transformation between the CsPbBr3 PNCs and Cs4PbBr6 PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 58%

Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

Rao¹,

Ding²,

Du³

et al. 2019

Beilstein J. Nanotechnol.

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“…Figure 3a shows PQDs with the cuboid shape with orthorhombic phase. [50] Figure S1 (Supporting Information) shows S-AIMs with irregular shapes and randomly distributed particle size at 0.5-50 µm, which are www.advmattechnol.de further confirmed by the scanning electron microscopy (SEM) images in Figure 3b. The X-ray powder diffraction (XRD) pattern in Figure S2 (Supporting Information) shows peaks corresponding to the [0 0 1], [1 1 0], and [−2 0 0] crystal faces.…”

Section: Resultssupporting

confidence: 56%

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Song

et al. 2020

Adv Materials Technologies

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hence have drawn a lot of attention as down-conversion materials for white lightemitting diodes (WLEDs). [7][8][9][10] For practical applications, the cost-effectiveness, the optical performance, and the stability of PQDs should be further improved. [4] Particularly, PQDs suffer from low chemical and optical stabilities, resulting in their fast degradation under exposure to moisture, heat, and light irradiance. [11,12] Accordingly, PQDs exhibit much lower stability than conventional rare-earth-based phosphor materials. [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 . [30] Generally, the protective shells of PQDs are prepared using these inorganic materials by in situ synthesis. While protected PQDs with high chemical, thermal, and irradiation stabilities have been obtained, [28] the water stability of PQDs prepared with these inorganic shells still indicate a lot of room for improvement. For instance, the PL intensity of CaF 2 shell-integrated green PQDs reduces to <50% after a water-resistance test of ≈40 h. [20] Consequently, and until now, PQDs with high water stability are achieved by embedding them in enclosed organic polymer and glass matrices. [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their At present, most of lead halide perovskite quantum dots (PQDs) embedded in an enclosed organic polymer or glass matrix can achieve high water stability, yet this limits their subsequent integration with light-emitting diodes (LEDs) and other functional materials. Herein, a postadsorption process using superhydrophobic aerogel inorganic matrix (S-AIM) with open structures is presented to enhance water stability of PQDs and compose newfunctions to them such as magnetism. The CsPbBr 3 PQDs integrated with the S-AIM (AeroPQDs) exhibit a high relative photoluminescence quantum yield (PLQY, 75.6%) of 90.9% compared to pristine PQDs (PLQY, 83.2%). They preserve their initial PL intensity after 11 days of soaking in water and achieve a high relative PLQY stability (50.5%) after soaking for 3.5 months. The hydrophobic (rough) surface of the matrix, its pores with a well-matched mean diameter that promotes the homogeneous integration of PQDs and hinders the penetration of water as well as the oleophylic functional groups covering the surface of these pores are the three factors responsible for the high water stability. Finally, AeroPQDs are easily integrated with other functional nanomaterials, such as Fe 3 O 4 nanoparticles for magnetic manipulation, due to their open structure.

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“…While efforts have been made to eliminate the use of polar solvents, they typically still require oleic acid/oleylamine (OA/OAm) in a combination with lengthy probe sonication or high temperature precursor heating steps to achieve good quality NCs, both of which require a lot of energy. [18,23,24] In addition, probe sonication is not scalable, and this is a major concern preventing such approaches from being industrially feasible. Herein, we demonstrate a simple route to synthesize fully inorganic and organic-inorganic perovskite NCs at RT in air, without the use of polar solvents, and thus favoring industrial scale up.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis of Phosphine‐Capped Lead Bromide Perovskite Nanocrystals without Coordinating Solvents

Ambrož

Gadipelli

et al. 2019

Part & Part Syst Charact

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The room temperature synthesis of perovskite nanocrystals (NCs) is typically achieved by employing a ligand-assisted reprecipitation (LARP) method, which can be handled in air, and its products are comparable to what is obtained using the traditional hot-injection method. However, the LARP method typically requires the use of coordinating polar solvents such as dimethylformamide, that are not appropriate for large-scale production due to toxicity concerns and can also degrade or form defective perovskite NCs. Herein, an amine and oleic acid-free room temperature synthesis of lead bromide perovskite NCs is reported that uses a combination of trioctylphosphine oxide and diisooctylphosphinic acid ligands. This combination of ligands provides a stable platform for the polar-solvent-free synthesis in air of fully inorganic CsPbBr3 (fwhm ≈14 nm, emission = 519 nm) and hybrid organic-inorganic FAPbBr3 (fwhm ≈19 nm) NCs with photoluminescence emission between 530-535 nm which is in line with the Rec. 2020 color standards. In addition, it is shown that compared to a traditionally-used ligand combination, phosphine ligands can be easily removed from the surface of the NCs, which is important for the future development of this technology in optoelectronic devices.

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Polar-Solvent-Free Synthesis of Highly Photoluminescent and Stable CsPbBr₃ Nanocrystals with Controlled Shape and Size by Ultrasonication

Cited by 73 publications

References 68 publications

Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Room Temperature Synthesis of Phosphine‐Capped Lead Bromide Perovskite Nanocrystals without Coordinating Solvents

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Polar-Solvent-Free Synthesis of Highly Photoluminescent and Stable CsPbBr3 Nanocrystals with Controlled Shape and Size by Ultrasonication

Cited by 73 publications

References 68 publications

Ultrasonication-assisted synthesis of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals and their reversible transformation

Ultrasonication-assisted synthesis of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals and their reversible transformation

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Room Temperature Synthesis of Phosphine‐Capped Lead Bromide Perovskite Nanocrystals without Coordinating Solvents

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Polar-Solvent-Free Synthesis of Highly Photoluminescent and Stable CsPbBr₃ Nanocrystals with Controlled Shape and Size by Ultrasonication

Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation