Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates

Chen, Xiaomei; Lu, Wen gao; Tang, Jui-Hsiang; Zhang, Yongyou; Wang, Yongtian; Scholes, Gregory D.; Zhong, Haizheng

doi:10.1038/s41566-021-00865-0

Cited by 96 publications

(66 citation statements)

References 33 publications

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“…First, the UV−vis absorption spectrum of Br 6 SCs shows an excitonic absorption edge around 520 nm, which is the characteristic absorption edge of CsPbBr 3 , while this absorption edge cannot be found in pure Cs 4 PbBr 6 SCs or NCs. 25,26 Second, based on the previously reported results on Cs 4 PbX 6 , the colored SCs we obtained also imply the existence of the CsPbX 3 phase in Cs 4 PbX 6 SCs. 16 Finally, the PL peaks show a blue shift with the increase of Cl − in our Br 6−x Cl x SCs, and this blue shift might be caused by the bandgap widening of CsPbCl x Br 3−x NCs, 27,28 which is also indicative of the existence of the CsPbX 3 phase.…”

Section: Resultssupporting

confidence: 80%

Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging

Zhou

et al. 2021

J. Phys. Chem. C

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There is a growing demand for novel scintillators with applications in security inspection, medical radiography, X-ray astronomy, and so on. However, the conventional all-inorganic scintillators encounter typical bottlenecks such as high cost, fixed emission band, and long decay time, etc. The recently developed halide perovskite scintillators are subjected to defectsinduced thermal quenching and moisture instability. Herein, we developed a series of zero-dimensional perovskite single crystals (SCs) as scintillators with tunable emission through a simple low-temperature solution method. The emission wavelength of Cs 4 PbBr 6−x Cl x SCs can be tuned from ∼528 to ∼433 nm by varying the Br/Cl ratio. In addition, the photoluminescent lifetimes can be shortened to 0.62 ns with the increase of Cl − . The scintillating properties of our SCs were studied, and the X-ray imaging results showed a high spatial resolution of 4.0 line-pairs per millimeter. Also, the obtained crystals exhibit impressive stability under ambient conditions. This work provides a new strategy to design and synthesize perovskite scintillators, which hold potential in promoting fast scintillators performance.

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Section: Resultssupporting

confidence: 80%

Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging

Zhou

et al. 2021

J. Phys. Chem. C

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“…Recently, Chen et al. reported the inorganic perovskite crystals Cs 4 PbBr 6 embedded with CsPbBr 3 nanocrystals as achromatic quarter‐wave plates, which indicates that halide perovskites with lone‐pair electrons may be potential birefringent crystals [1d] . All in all, halide perovskites were persistently neglected as birefringent crystals.…”

Section: Figurementioning

confidence: 99%

A Hybrid Halide Perovskite Birefringent Crystal

et al. 2022

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Birefringent crystals that can modulate the polarization of light play a significant role in modern optical devices including polarizing microscopes, optical isolators, and achromatic quarter-wave plates. To date, commercial birefringent crystals are exclusively limited to purely inorganic compounds. Here we report a new organic-inorganic hybrid halide, MLAPbBr 4 (MLA = melamine), which features a (110)-oriented layered perovskite structure. Although the 6s 2 lone-pair electrons of Pb 2 + cations are stereochemically inert, MLAPbBr 4 exhibits a birefringence of 0.322@550 nm, which exceeds those of all commercial birefringent crystals. The first-principles calculations reveal that this birefringence should be ascribed to the highly dislocated π-conjugation of MLA cations and high distortion of PbBr 6 octahedra. This work highlights the persistently neglected great potential of hybrid halide perovskites as birefringent crystals.Birefringent crystals play a significant role in optical devices, e.g. polarizing microscopes, optical isolators, achromatic quarter-wave plates, and phase compensators, etc. [1] At present, commercial birefringent crystals mainly include YVO 4 (birefringence Δn = 0.204@532 nm), [2] LiNbO 3 (Δn = 0.074@546 nm), [3] TiO 2 (Δn = 0.256@546 nm), [4] CaCO 3 (Δn = 0.172@532 nm), [5] and α-BaB 2 O 4 (Δn = 0.122@546 nm). [6] Among them, the applications of natural birefringent crystals (e.g., CaCO 3 and TiO 2 ) are limited by their inadequate crystal quality such as defects and impurities. Artificial birefringent crystals (e.g., YVO 4 , LiNbO 3 , and α-BaB 2 O 4 ), on the other hand, are relatively expensive and the growth of single crystals is energy-consuming. Hence, it is still of great scientific and technological significance to design and synthesize new birefringent crystals.

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“…[1][2][3][4] The integration of components with different properties usually endows the resultant heterojunctions with a combination of the properties and realize superior performances to that of the individual materials. [5][6][7][8] It is of great importance to rationally design and controllably synthesize heterostructures with specific component, phase, morphology and interface, not only for the enhancement in physical self-trapped excitons (STE). [12][13][14] The formation of their multiple heterostructures can reinforce the optical properties and stability.…”

Section: Introductionmentioning

confidence: 99%

Kinetics‐Controlled Interfacial Synthesis of Janus and Patchy Heterostructures Based on Perovskite Nanocrystals

Chen

Mao

Zhong

et al. 2022

Advanced Optical Materials

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Heterostructures integrated by diverse material featuring nanocrystals (NCs) tunable properties and functions are of great interest. However, to rationally design and precisely control the heterostructures in multiple shapes still remains a tremendous challenge. In this work, the nucleation of SiO2 nanoparticles is manipulated via a kinetics‐controlled water–hexane interfacial reaction system to construct Cs3Cu2I5/SiO2 heterostructures, which can be well controlled in Janus and patchy morphology. In this interfacial reaction, the evolution of Cs3Cu2I5 NCs and the intrinsic formation mechanism of the heterostructures are investigated. It is observed that the Cs3Cu2I5 NCs on the interface undergo a morphology transformation driven by ligand loss and exposed facets evolution. Increased wettability between Cs3Cu2I5 and SiO2 favors the formation of Cs3Cu2I5/SiO2 heterostructures. The key to this strategy is to break the rule of thermodynamic domination in reaction by kinetics manipulation when constructing the patchy heterostructure. To be noted, an increased stability is conferred on the resultant heterostructure product compared to naked perovskite NCs. This work enables to better control the complicated heterostructure configurations and understand their formation mechanism.

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Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates

Cited by 96 publications

References 33 publications

Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging

Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging

A Hybrid Halide Perovskite Birefringent Crystal

Kinetics‐Controlled Interfacial Synthesis of Janus and Patchy Heterostructures Based on Perovskite Nanocrystals

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Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates

Cited by 96 publications

References 33 publications

Cs4PbBr6–xClx Single Crystals with Tunable Emission for X-ray Detection and Imaging

Cs4PbBr6–xClx Single Crystals with Tunable Emission for X-ray Detection and Imaging

A Hybrid Halide Perovskite Birefringent Crystal

Kinetics‐Controlled Interfacial Synthesis of Janus and Patchy Heterostructures Based on Perovskite Nanocrystals

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Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging

Cs₄PbBr_6–xCl_x Single Crystals with Tunable Emission for X-ray Detection and Imaging