Monodisperse and brightly luminescent CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals

Xuan, Tongtong; Lou, Sunqi; Huang, Junjian; Cao, Linglong; Yang, Xianfeng; Li, Huili; Wang, Jing

doi:10.1039/c8nr01266k

Cited by 105 publications

(86 citation statements)

References 35 publications

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“…As aforementioned, the inorganic passivation shell of Cs 4 PbBr 6 crystals might be a good way to help radiative processes outpace with Auger transition. Moreover, the synthetic condition of Cs 4 PbBr 6 crystals is compatible with that of CsPbBr 3 NPLs …”

Section: Exciton Behavior Of Nanoplateletsmentioning

confidence: 88%

“…[70] Xuan et al reported a new fashion to decrease the crystal grains down to tens of nanometer sizes by introducing 2-methylimidazole (MeIm) as the capping ligand to regulate their growth rate (Figure 11g). [71] Apart from dissolving the halide salts, MeIm combined with precursor stirring time played a key role in morphology and size. The addition of MeIm not only controls the parameters (the composition rate, the size, and dispersity) of CsPbBr 3 in the composite nanocrystals, but can also help controllably obtain the monodispersed and hexagonal Cs 4 PbBr 6 matrix.…”

Section: Wwwadvancedsciencenewscom Wwwsmall-methodscommentioning

confidence: 99%

“…Although the intolerance of polar solvent to perovskites limits its applicability in this way, some core-shell perovskite NPLs, such as SiO 2 -, Al 2 O 3 -, Cs 4 PbBr 6 -coated NPLs, and NPLs with robust organic protecting ligands would make it possible to survive in the polar solvent. [29,71,87] On the other hand, seeking for suitable nonpolar solvents or their mixture matches is also an alternative solution. Thus, we have reasons to expect that modified Langmuir-Blodgett techniques can be used to fabricate perovskite NPL films with tunable orientation.…”

Section: Wwwadvancedsciencenewscom Wwwsmall-methodscommentioning

confidence: 99%

“…g) High resolution transmission electron microscopy (HRTEM) and enlarged HRTEM images of the as‐prepared CPB113/CPB416 nanocrystals. Reproduced with permission . Copyright 2018, The Royal Society of Chemistry.…”

Section: Surface Engineeringmentioning

confidence: 99%

“…The crystals' emission varied from blue to green (from 464 to 520 nm) with the growth of crystals . Xuan et al reported a new fashion to decrease the crystal grains down to tens of nanometer sizes by introducing 2‐methylimidazole (MeIm) as the capping ligand to regulate their growth rate (Figure g) . Apart from dissolving the halide salts, MeIm combined with precursor stirring time played a key role in morphology and size.…”

Section: Surface Engineeringmentioning

confidence: 99%

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Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

et al. 2019

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Metal halide perovskites witness a huge development in light‐emitting diodes (LEDs) triggered by their unique optical and optoelectronic properties. However, blue emission perovskite LEDs lag behind their red and green counterparts in efficiency, due to the difficulties in synthesizing stable materials and maintaining quantum efficiency in thin films as high as in solution. The nanoplatelets (NPLs), with exciton binding energies up to several hundreds of meV, exhibit fundamentally different excitonic behavior from 0D nanocrystals. Meanwhile the bandgap tunability with thickness makes them promising for blue optoelectronic devices. Here, a brief review on recent progress in perovskite light emission, and the opportunities and challenges in pure bromide‐based perovskite NPLs for the blue‐emitting regime are provided. In particular, the important roles of surface ligands and emitting layer quality on devices are highlighted. The trade‐off between well surface passivation and efficient charge transportation is analyzed. Furthermore, it is recommended that more efforts should be put on exploring the carrier dynamics in NPLs, which act as guidelines for optimization of materials and improvement of devices.

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Section: Exciton Behavior Of Nanoplateletsmentioning

confidence: 88%

Section: Wwwadvancedsciencenewscom Wwwsmall-methodscommentioning

confidence: 99%

Section: Wwwadvancedsciencenewscom Wwwsmall-methodscommentioning

confidence: 99%

Section: Surface Engineeringmentioning

confidence: 99%

Section: Surface Engineeringmentioning

confidence: 99%

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Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

et al. 2019

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Light Emitting Diodes Based on Inorganic Composite Halide Perovskites

Lian

Wang

Ling

et al. 2018

Adv Funct Materials

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CsPbBr 3 is a promising type of light-emitting halide perovskite with inorganic composition and desirable thermal stability. The luminescence efficiency of pristine CsPbBr 3 thin films, however, appeared to be limited. In this work, we have demonstrated light emitting diodes based on CsPbBr 3 |Cs 4 PbBr 6 composites. Both quantum efficiency and emission brightness have been improved significantly compared with similar devices constructed using pure CsPbBr 3 . The high brightness can be attributed to the enhanced radiative recombination from CsPbBr 3 crystallites confined in the Cs 4 PbBr 6 host matrix. The unfavorable charge transport property of Cs 4 PbBr 6 can be circumvented by optimizing the ratio between the host and the guest components and the total thickness of the composite thin films. The inorganic composition of the emitting layer also leads to improved device stability under the condition of continuous operation.

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Recent Progress on Synthesis, Characterization, and Applications of Metal Halide Perovskites@Metal Oxide

Duan

Wang

Costa

2021

Adv Funct Materials

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Metal halide perovskites (MHPs) have become a promising candidate in a myriad of applications, such as light-emitting diodes, solar cells, lasing, photodetectors, photocatalysis, transistors, etc. This is related to the synergy of their excellent features, including high photoluminescence quantum yields, narrow and tunable emission, long charge carrier lifetimes, broad absorption spectrum along with high extinction absorptions coefficients, among others. However, the main bottleneck is the poor stability of the MHPs under ambient conditions. This is imposing severe restrictions with respect to their industrialized applications and commercialization. In this context, metal oxide (MO x ) coatings have recently emerged as an efficient strategy toward overcoming the stabilities issues as well as retaining the excellent properties of the MHPs, and therefore facilitate the development of the related devices' stabilities and performances. This review provides a summary of the recent progress on synthetic methods, enhanced features, the techniques to assess the MHPs@MO x composites, and applications of the MHPs@MO x . Specially, novel approaches to fabricate the composites and new applications of the composites are also reported in this review for the first time. This is rounded by a critical outlook about the current MHPs' stability issues and the further direction to ensure a bright future of MHPs@MO x .

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Monodisperse and brightly luminescent CsPbBr₃/Cs₄PbBr₆ perovskite composite nanocrystals

Cited by 105 publications

References 35 publications

Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

Light Emitting Diodes Based on Inorganic Composite Halide Perovskites

Recent Progress on Synthesis, Characterization, and Applications of Metal Halide Perovskites@Metal Oxide

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