Broad-band lead halide perovskite quantum dot single-mode lasers

Zhou, Chun; Yu, Jie; Dong, Hongxing; Yuan, Fanglong; Zheng, Xiaopeng; Jiang, Mingming; Zhang, Long

doi:10.1039/d0tc02551h

Cited by 29 publications

(14 citation statements)

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“…For instance, regarding the photonic field, perovskites are promising active material for light-emitting diodes (LEDs), reaching photoluminescence quantum yields (PLQY) close to 100% and external quantum efficiencies (EQE LED ) exceeding 20% . Laser and space applications and energy storage as flash memory devices or as thermochromic materials for smart windows are only some of the novel advanced technologies in which perovskites are gaining prominence. − However, it is in optical sensing where metal halide perovskite single crystals (MHPSCs) acquire more protagonism. The high responsivity ( R ) and specific detectivity ( D *) that have been demonstrated for MHPSCs make them very adequate materials for transducing a light signal into an electrical one, performing as high-efficiency photodetectors. , Figure a shows a photodetector and its performance parameters.…”

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confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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Metal halide perovskite single crystals (MHPSCs) are gaining enormous attention in the energy research community due to their impressive responses both in optical sensing and in photovoltaics. The switching from polycrystalline to monocrystalline morphology, not only allows to maintain the outstanding properties that characterize perovskite materials, but also enhances them. However, the poor control over the thickness and size during growing methods leads to considerable differences between surface and bulk responses. Impedance spectroscopy (IS) has been revealed as a powerful technique to understand the kinetics governing polycrystalline perovskite materials. The ionic migration, trap states, and recombination mechanisms occurring in both bulk and surface of the MHPSCs, need to be analyzed in depth to exploit their full potential. Here, we highlight the importance of IS to further advance our knowledge about monocrystalline perovskite materials, bringing to the table the relevance of other small perturbation techniques to complement the IS.

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confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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“…All inorganic lead halide perovskites CsPbX 3 (X = Cl, Br and I) have drawn immense attention due to their tuneability visible to NIR absorption and emission spectra, large carrier diffusion lengths (>3 mm), and high lifetime (82 ± 5 µs) [1] making them suitable candidates for advanced optoelectronic devices like solar cells, [2] light-emitting diodes (LEDs), [3] photodetectors, [4,5] electronically and structurally stable even at ambient conditions. [14] As an alternative, ligand cell, could stabilize the phase of the perovskite nanocrystals without altering its optical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Atomic Insights of Stable, Monodispersed CsPbI₃₋_xBr_x (x = 0, 1, 2, 3) Nanocrystals Synthesized by Modified Ligand Cell

Ghorai

Mahato

Srivastava

et al. 2022

Adv Funct Materials

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Synthesis of monodispersed, stable halide, and mixed halide perovskite nanocrystals by hot‐injection approach is still challenging due to the fast reaction kinetics and unrevealed ligand chemistry. The atomic scale imaging of perovskite nanocrystals using transmission electron microscopy (TEM) is also challenging because of their structural degradation due to high electron dose and soft nature of perovskites. Here, a novel technique is proposed to synthesize pure cubic phase, monodispersed, stable CsPbX3 (X = I/Br) nanocrystals by simply modifying ligand chemistry using olive oil, which also leads to realization of tuneable composition mixed halide perovskites by simple physical mixing. Here, the atomic scale images and the probable distribution of Cs, Pb, and I/Br atoms in single halide and mixed halide perovskites via high‐resolution TEM microscopy are presented. The estimated atomic distance (PbPb and PbI/Br) is strongly corroborated with the VESTA structure. Interestingly, the lattice constant (d‐value) of the synthesized nanocrystals is smaller (≈3%) than the theoretical predicted one, leading to a higher phase stability in laboratory ambient conditions (45–55% humidity, 300 K). The theoretical analysis using density functional theory enlightens the understanding of higher stability of CsPbI2Br along with the maximum optical absorption in the visible regime, as a preferable material for the photovoltaic applications.

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“…The power conversion efficiencies of perovskite solar cells (PSCs) have been improved rapidly, from the first reported value of 3.8% to the current record of 25.5% [ 5 , 6 ]. For many other device applications, such as light-emitting devices (LEDs) [ 7 , 8 , 9 ], lasers [ 10 , 11 ], and photodetectors [ 12 ], perovskite materials have also been widely adopted to construct next-generation optoelectronic devices. In particular, perovskite materials possess high photoluminescence quantum yield (PLQY) and narrow emission over the entire visible spectrum; their high color purities make them promising candidates for future displays and lighting sources [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Position Effects of Metal Nanoparticles on the Performance of Perovskite Light-Emitting Diodes

Yang

Chen

2021

Nanomaterials

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Metal nanoparticles have been widely used for improving the efficiencies of many optoelectronic devices. Herein, position effects of gold nanoparticles (Au NPs) on the performance of perovskite light-emitting diodes (PeLEDs) are investigated. Amphiphilic Au NPs are synthesized so that they can be incorporated into different layers of the PeLEDs to enhance device efficiencies. The photoluminescent (PL) studies indicate apparent position effects; the strongest PL intensity occurs when the NPs are directly blended with the light-emitting perovskite layer. In contrast, the PeLEDs exhibit the highest luminance efficiency while the Au NPs are placed in the hole-transporting layer. The direct blending of the NPs in the perovskite layer might affect the electrical properties, resulting in inferior device performance. The results reported herein can help to understand the enhancing mechanism of the PeLEDs and may also lead to even better efficiencies in the near future.

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Broad-band lead halide perovskite quantum dot single-mode lasers

Abstract: Perovskite colloidal quantum dots (CQDs) enable the solution-processed approach toward laser, simultaneously providing tunable wavelength, high quantum efficiency, large absorption cross-section, and long Auger lifetimes. However, broad-band single-mode lasers based...

Cited by 29 publications

References 46 publications

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Atomic Insights of Stable, Monodispersed CsPbI₃₋_xBr_x (x = 0, 1, 2, 3) Nanocrystals Synthesized by Modified Ligand Cell

Position Effects of Metal Nanoparticles on the Performance of Perovskite Light-Emitting Diodes

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Broad-band lead halide perovskite quantum dot single-mode lasers

Abstract: Perovskite colloidal quantum dots (CQDs) enable the solution-processed approach toward laser, simultaneously providing tunable wavelength, high quantum efficiency, large absorption cross-section, and long Auger lifetimes. However, broad-band single-mode lasers based...

Cited by 29 publications

References 46 publications

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Atomic Insights of Stable, Monodispersed CsPbI3−xBrx (x = 0, 1, 2, 3) Nanocrystals Synthesized by Modified Ligand Cell

Position Effects of Metal Nanoparticles on the Performance of Perovskite Light-Emitting Diodes

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Atomic Insights of Stable, Monodispersed CsPbI₃₋_xBr_x (x = 0, 1, 2, 3) Nanocrystals Synthesized by Modified Ligand Cell