Highly stable and luminescent silica-coated perovskite quantum dots at nanoscale-particle level via nonpolar solvent synthesis

Gao, Fei; Yang, Weiqiang; Liu, Xiuling; Li, Yuanzheng; Liu, Weizhen; Xu, Haiyang; Liu, Yichun

doi:10.1016/j.cej.2020.128001

Cited by 75 publications

(47 citation statements)

References 53 publications

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“…Colloidal semiconductor nanoplatelets are materials characterized by large exciton binding energy and oscillator strength, sharp spectral features, 1 − 4 and short photoluminescence lifetimes, 2 all properties that make them appealing in devices such as light-emitting diodes and lasers. 2 , 5 − 7 The extreme thinness, down to just a few atoms, is both the source of their unique optical properties and a major challenge for their structural characterization.…”

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confidence: 99%

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

et al. 2021

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The research on two-dimensional colloidal semiconductors has received a boost from the emergence of ultrathin lead halide perovskite nanoplatelets. While the optical properties of these materials have been widely investigated, their accurate structural and compositional characterization is still challenging. Here, we exploited the natural tendency of the platelets to stack into highly ordered films, which can be treated as single crystals made of alternating layers of organic ligands and inorganic nanoplatelets, to investigate their structure by multilayer diffraction. Using X-ray diffraction alone, this method allowed us to reveal the structure of ∼12 Å thick Cs–Pb–Br perovskite and ∼25 Å thick Cs–Pb–I–Cl Ruddlesden–Popper nanoplatelets by precisely measuring their thickness, stoichiometry, surface passivation type and coverage, as well as deviations from the crystal structures of the corresponding bulk materials. It is noteworthy that a single, readily available experimental technique, coupled with proper modeling, provides access to such detailed structural and compositional information.

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confidence: 99%

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

et al. 2021

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“…Surface coating of CsPbX 3 QDs with appropriate materials can avoid direct contact with moisture, light, and oxygen and reduce the Pb diffusion to the environment. The coating materials can be inorganic or polymer materials (Loiudice et al, 2017;Zhang et al, 2017;Park et al, 2018;Bhattacharyya et al, 2019;Gao et al, 2021).…”

Section: Surface Coatingmentioning

confidence: 99%

“…Currently, tetraethyl orthosilicate (TEOS) is the most common silicon source. Gao et al (2021) prepared CsPbBr 3 @ SiO 2 QDs using TEOS as the silicon source and hydrophobic TOPO as the inhibitor, whose PLQY reached 87% compared to the pristine QDs, thereby prominently improving the stability. However, coating with the TEOS silicon source required a harsh alkaline environment, and the QDs were prone to quenching.…”

Section: Inorganic Materials Coatingmentioning

confidence: 99%

Strategies of Improving CsPbX3 Perovskite Quantum Dots Optical Performance

Jia

et al. 2022

Front. Mater.

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All-inorganic perovskite quantum dots (QDs) (CsPbX3, X = Cl, Br, I) become promising candidate materials for the new generation of light-emitting diodes for their narrow emission spectrum, high photoluminescence quantum yield, and adjustable emission wavelength. However, the perovskite QDs materials still face instability against moisture, high-temperature, and UV-light. Many strategies have been reported to improve the photoluminescence (PL) performance of QDs while increasing their stability. These strategies can be divided into three main categories: doping engineering, surface ligand modification, coating strategies. This paper reviews the recent research progress of surface ligands, inorganic and polymer coating, and metal ions doping of CsPbX3 QDs. Partial substitution of Pb2+ with non-toxic or low-toxic metal ions can improve the formation energy of the perovskite lattice and reduce its toxicity. The surface polymer modification can use their ligands to bond with the uncoordinated lead and halogen ions on perovskite QDs surface to reduce surface defects, thereby improving the PL intensity and stability. In addition, the organic or inorganic coating materials on perovskite QDs can effectively avoid their contact with the external environment, thereby improving the stability of the perovskite. The optical properties of the modified QDs, including transient absorption spectra, temperature-dependent PL spectra, time-resolved photoluminescence (TRPL) spectra properties, etc. were discussed to explain the physical mechanism. The potential applications of all-inorganic perovskite QDs as down-conversion fluorescent materials in light-emitting diodes are presented. Finally, we provide some possible methods to further improve the PL performance of the all-inorganic perovskite QDs.

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“…16 However, MHPs based pc-LEDs have been strongly limited by the low stability of the MHPs under ambient and device operation conditions. 10,17 Up to date, several strategies have been developed towards stable MHP-phosphors: i) metal oxides/polymers to encapsulate the MHPs, 7,[18][19][20][21][22][23] ii) adopting compositional engineering to optimize the Goldschmidt tolerance, [24][25] and iii) surface engineering to passivate the surface defects and to increase resistance against, for example, polar solvents. [26][27] However, the most common strategy to fabricate MHP-phosphors is the post-encapsulation of the asprepared MHPs with polymer matrices like polymethylmethacrylate (PMMA), 12,[28][29][30][31][32] or resin.…”

Section: Introductionmentioning

confidence: 99%

In Situ Ambient Preparation of Perovskite-Poly(l-lactic acid) Phosphors for Highly Stable and Efficient Hybrid Light-Emitting Diodes

Duan

Yin

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Metal halide perovskites (MHPs) based phosphor-converted light-emitting diodes (pc-LEDs) are limited by the low MHP stability under storage/operation conditions. A few works have recently stablished the in-situ synthesis of MHPs into polymer matrices as an effective strategy to enhance MHP's stability with a low-cost fabrication. However, this is limited within petrochemical-based polymers. Herein, the first in-situ ambient preparation of highly luminescent and stable MHPs-bio-polymer filters (MAPbBr3 nanocrystals as emitter and poly(L-lactide acid) (PLLA) as matrix) with arbitrary areas (up to ca. 300 cm 2 ) is reported. The MAPbBr3-PLLA phosphors feature a narrow emission (25 nm) with excellent photoluminescence quantum yields (>85%) and stabilities under ambient storage, water, and thermal stress. This is corroborated in green pc-LEDs featuring a low efficiency roll-off, excellent operational stability of ca. 600 h, and high luminous efficiencies of 65 lm W −1 that stand out the prior art (e.g., average lifetime of 200 h at 50 lm W -1 ). The filters are further exploited to fabricate white-emitting pc-LEDs with efficiencies of ca. 73 lm W -1 and x/y CIE color coordinates of 0.33/0.32. Overall, this work stablishes a straightforward (one-pot/insitu) and low-cost preparation (ambient/room temperature) of highly efficient and stable MHP-bio-polymer phosphors for highly performing and more sustainable lighting devices.

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Highly stable and luminescent silica-coated perovskite quantum dots at nanoscale-particle level via nonpolar solvent synthesis

Cited by 75 publications

References 53 publications

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

Strategies of Improving CsPbX3 Perovskite Quantum Dots Optical Performance

In Situ Ambient Preparation of Perovskite-Poly(l-lactic acid) Phosphors for Highly Stable and Efficient Hybrid Light-Emitting Diodes

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