Controlling the nucleation and growth kinetics of lead halide perovskite quantum dots

Science, Journal Year: 2022, Volume and Issue: 377(6613), P. 1406 - 1412

Published: Sept. 8, 2022

Colloidal lead halide perovskite nanocrystals are of interest as photoluminescent quantum dots (QDs) whose properties depend on the size and shape. They normally synthesized subsecond time scales through hard-to-control ionic metathesis reactions. We report a room-temperature synthesis monodisperse, isolable, spheroidal APbBr3 QDs ("A" indicates cesium, formamidinium, methylammonium) that tunable from 3 to >13 nanometers. The kinetics both nucleation growth temporally separated substantially slowed down by intricate equilibrium between precursor (PbBr2) A[PbBr3] solute, with latter serving monomer. all these compositions exhibit up four excitonic transitions in their linear absorption spectra, we demonstrate size-dependent confinement energy for is independent A-site cation.

Language: Английский

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Colloidal Metal‐Halide Perovskite Nanoplatelets: Thickness‐Controlled Synthesis, Properties, and Application in Light‐Emitting Diodes

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(10)

Published: Nov. 14, 2021

Abstract Colloidal metal‐halide perovskite nanocrystals (MHP NCs) are gaining significant attention for a wide range of optoelectronics applications owing to their exciting properties, such as defect tolerance, near‐unity photoluminescence quantum yield, and tunable emission across the entire visible wavelength range. Although optical properties MHP NCs easily through halide composition, they suffer from light‐induced phase segregation that limits use in devices. However, MHPs can be synthesized form colloidal nanoplatelets (NPls) with monolayer (ML)‐level thickness control, exhibiting strong confinement effects, thus enabling by controlling bromide or iodide‐based lead‐halide NPls. In addition, NPls exhibit narrow peaks, have high exciton binding energies, higher fraction radiative recombination compared bulk counterparts, making them ideal candidates light‐emitting diodes (LEDs). This review discusses state‐of‐the‐art NPls: synthetic routes, thickness‐controlled synthesis both organic–inorganic hybrid all‐inorganic NPls, linear nonlinear (including charge‐carrier dynamics), performance LEDs. Furthermore, challenges associated synthesis, environmental thermal stability, application efficient LEDs discussed.

Language: Английский

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Ligand Chemistry of Inorganic Lead Halide Perovskite Nanocrystals

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 1152 - 1191

Published: Jan. 26, 2023

Lead halide perovskite nanocrystals (LHP NCs) have emerged as next-generation semiconductor materials with outstanding optical and optoelectronic properties. Because of the high surface-to-volume ratio, performance colloidal stability LHP NCs largely depend on their surface chemistry, especially ligands termination. On one hand, capping improve luminescence; other hand highly dynamic binding nature is detrimental to photoluminescence NCs. In addition, functionalization desired molecules induces new functionalities such chirality, light harvesting, triplet sensitization through energy/electron transfer or use X-ray detectors. this review, we present current understanding an atomic view chemistry NCs, including crystal termination, vacancies, different types ligands. Furthermore, discuss ligand-induced functionalities, photocatalysis chirality.

Language: Английский

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Rational Design of Metal Halide Perovskite Nanocrystals for Photocatalytic CO₂ Reduction: Recent Advances, Challenges, and Prospects

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 7(6), P. 2043 - 2059

Published: May 23, 2022

Metal halide perovskite nanocrystals (MHP NCs) have attracted much scientific interest in photocatalysis. Various types of MHP photocatalysts been intensively explored photocatalytic CO2 reduction the past few years. However, some key issues, such as severe charge recombination, low stability, and origin products, created bottlenecks developing photocatalysts. Therefore, rational design MHPs is worthwhile to deepen our understanding above issues develop efficient This Focus Review highlights recent advances regarding principles toward reduction. modification strategies are clarified, an outlook on future challenges prospects also provided point out possible research directions It anticipated that this can provide guidance MHP-based help uncover common encountered by community when studying

Language: Английский

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Small-angle X-ray and neutron scattering

Nature Reviews Methods Primers, Journal Year: 2021, Volume and Issue: 1(1)

Published: Oct. 12, 2021

Language: Английский

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Industry outlook of perovskite quantum dots for display applications

Nature Nanotechnology, Journal Year: 2022, Volume and Issue: 17(8), P. 813 - 816

Published: July 22, 2022

Language: Английский

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Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

Nanoscale Horizons, Journal Year: 2022, Volume and Issue: 7(9), P. 941 - 1015

Published: Jan. 1, 2022

Oleic acid and oleylamine are added in a solution containing suitable precursors they can often form complexes with metal ions. These may be thermally decomposed to yield ligand-coated nanoparticles tendency assemblies.

Language: Английский

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Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospective

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(6)

Published: Oct. 27, 2023

Abstract Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, emerged as promising candidates for high‐performance solar cells, light‐emitting diodes (LEDs), lasers, photodetectors, radiation detectors. The impressive optical optoelectronic properties, along with rapid increase efficiencies cells LEDs, greatly attracted researchers across many disciplines. However, most advances made so far terms preparation (colloidal nanocrystals films), devices highest are based on Pb‐based halide which raised concerns over their commercialization due to toxicity Pb. This has triggered search lower‐toxicity Pb‐free perovskites led significant progress last few years. In this roadmap review, different expertise joined together summarize latest progress, outstanding challenges, future directions perovskite regarding synthesis, spectroscopy, devices, guide currently working area well those that will join field future.

Language: Английский

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What Happens When Halide Perovskites Meet with Water?

The Journal of Physical Chemistry Letters, Journal Year: 2022, Volume and Issue: 13(10), P. 2281 - 2290

Published: March 4, 2022

Halide perovskites are considered to be next-generation semiconductor materials with bright prospects advance the technology of photonics and optoelectronics. Because intrinsic ionic feature, interactions between water induce serious stability issues, which has been one fundamental problems hindering practical application perovskites. The degradation halide upon exposure intensively studied, resulting in chemical insights into key processes, including hydration, phase transformation, decomposition, dissolution. In this Perspective, we try illustrate what happens when meet water. We summarize research progress regarding understanding these processes discuss principle strategy design toward improved against addition instability-related interactions, also aqueous solution perovskite precursors for fabricating perovskite-based functional materials. Hopefully, Perspective can inspire more studies on water, such as spectroscopy simulation, crystal structure material characterizations, chemistry crystallization.

Language: Английский

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Sb³⁺–Er³⁺‐Codoped Cs₂NaInCl₆for Emitting Blue and Short‐Wave Infrared Radiation

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(32)

Published: April 11, 2022

Cs2 NaInCl6 double perovskite is stable, environmentally benign and easy to prepare. But it has a wide band gap (5.1 eV), therefore, does not show optical optoelectronic properties in the visible short-wave infrared (SWIR) region. Here we introduce such functionalities by codoping Sb3+ (s-electron doping) Er3+ (f-electron ions. doping introduces optically allowed 5s2→ 5s1 5p1 electronic absorption at sub-band level, which then emits blue photoluminescence with ≈93 % quantum yield. f-f of parity forbidden. Codoping -Er3+ , leads transfer excitation energy from yielding SWIR emission 1540 nm. Temperature (6 300 K) dependent measurements elucidate mechanism. A phosphor converted light emitting diode (pc-LED) fabricated using codoped sample stable radiation over prolonged (84 hours) operation 5.1 V.

Language: Английский

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