Self-trapped excitons in two-dimensional perovskites

Li, Junze; Wang, Haizhen; Li, Dehui

doi:10.1007/s12200-020-1051-x

Cited by 82 publications

(101 citation statements)

References 45 publications

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“…[4a] The PL spectra exhibits a free exciton emission peak at around 513 nm and a low energy long tail which can be attributed to the self-trapped exciton emission. [8] Furthermore, strong oppositely signed CD signals confirm the presence of strong chirality in our chiral perovskites (Figure 2b). It is noted that different crystallization conditions always lead to the different crystallographic orientation and morphologies of the films, resulting in differences in the extinction and CD signals.…”

Section: Resultssupporting

confidence: 67%

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Chen

Liang

et al. 2021

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ventional Stokes polarimeters based on optical elements are always bulky and expensive, while optical metasurface techniques can directly estimate the Stokes vector by measuring the intensities in different polarization substrates but are very complex in microstructure design and fabrication.Chiral perovskites take advantages of both chiral materials and halide perovskites and thus are of significant interest for spintronic and optoelectronic applications. [3] It has been experimentally demonstrated that chiral 2D perovskites can effectively detect circularly polarized light. [4] Furthermore, 2D perovskites inherently possess optical anisotropy, which can be used to achieve polarizationsensitive photodetectors with the ability to sense the polarization of linearly polarized light. [5] Therefore, chiral 2D perovskites are expected to be capable of simultaneously sensing circularly polarized light and linearly polarized light. In this sense, it is anticipated that Stokes polarimeters can be realized based on chiral 2D perovskites with great simplicity. Recently, Stokes photodetectors based on chiral 2D perovskite nanowires have been reported. [6] The photocurrent anisotropy factors were first calibrated using the normalized absorption coefficient as a function of Stokes parameters, and then the theoretical absorption value of the device for different polarization states can be obtained. However, this Stokes photodetector can only detect polarized light that has been calibrated and the polarization state of arbitrary light cannot be fully distinguished. Moreover, it is required to specially control the morphology of chiral perovskites to detect linearly polarized light. To this end, it is necessary to explore new strategies so that the Stokes polarimeters can be directly constructed by using chiral 2D perovskite single crystals with arbitrary morphology.In this work, we explored the optical anisotropy within the crystallographic plane and cross plane of chiral 2D perovskites (S-and R-MBA) 2 PbI 4 (MBA = C 6 H 5 C 2 H 4 NH 3 ). The larger optical anisotropy within the cross plane of chiral 2D perovskites provides a foundation for the discrimination of linearly polarized light. With the ability to simultaneously sense circularly polarized light and linearly polarized light, chiral 2D perovskites are adopted to construct filterless on-chip Stokes polarimeters which can discriminate all polarization states of light. Our study provides a simple route to fabricate Stokes polarimeter by using materials that can distinguish both linearly and circularly polarized light.Full-Stokes polarimeters, equipped with the capability of discriminating light polarization states, can find important applications in various optical and optoelectronic devices. Nevertheless, currently most full-Stokes polarimeters require complex and bulky optical elements or optical metasystems integrated with metasurfaces, which can increase the cost and cause energy loss. Here, the anisotropy of chiral 2D perovskite single crystals is explored and the ...

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Section: Resultssupporting

confidence: 67%

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Chen

Liang

et al. 2021

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“…Time-resolved PL decays of the four samples are shown in Figure 2 d. Average PL lifetimes ( τ avg ) were calculated from these decays by using the following equation [ 17 ]:

and were found to be 2.9, 3.0, 3.2, and 3.1 μs for the ODASnBr 4 (EtOH), ODASnBr 4 [BuOH], ODASnBr 4 [PeOH], and ODASnBr 4 [HeOH], respectively. Such long PL decay times, alongside with broad PL profiles with large Stokes shifts are characteristic for self-trapped exciton states (STE) of the 2D tin halide perovskites that possess a soft lattice and strong electron–phonon interaction [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

Room Temperature Fabrication of Stable, Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Achieved through Use of Primary Alcohols

Wang

Portniagin

et al. 2021

Nanomaterials

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Lead-free two-dimensional metal halide perovskites have recently emerged as promising light-emitting materials due to their improved stability and attractive optical properties. Herein, a facile room temperature wet milling method has been developed to make Dion–Jacobson (DJ) phase ODASnBr4 perovskite microcrystals, whose crystallization was accomplished via the aid of introduced primary alcohols: ethanol, butanol, pentanol, and hexanol. Due to the strong intermolecular hydrogen bonding, the use of ethanol promoted the formation of non-doped ODASnBr4 microcrystals, with an emission peaked at 599 nm and a high photoluminescence quantum yield (PL QY) of 81%. By introducing other primary alcohols with weaker intermolecular hydrogen bonding such as butanol, pentanol, and hexanol, [SnBr6]4− octahedral slabs of the DJ perovskite microcrystals experienced various degrees of expansion while forming O–H…Br hydrogen bonds. This resulted in the emission spectra of these alcohol-doped microcrystals to be adjusted in the range from 572 to 601 nm, while keeping the PL QY high, at around 89%. Our synthetic strategy provides a viable pathway towards strongly emitting lead-free DJ perovskite microcrystals with an improved stability.

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“…[34][35][36][37][38][39] The double perovskites and low-dimensional perovskites were found to have strong STE emission. [40][41][42][43][44][45][46][47][48] Since the lattice deformation in these structures is easy to occur. In the fully inorganic Cs-Pb-Br systems, the STE emission was mainly discussed in zero-dimensional Cs 4 PbBr 6 , [49][50][51] in which the [PbBr 6 ] À octahedrons are isolated.…”

Section: Introductionmentioning

confidence: 99%

Free and self-trapped exciton emission in perovskite CsPbBr₃ microcrystals

Pan

et al. 2022

RSC Adv.

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Self-trapped excitons in two-dimensional perovskites

Cited by 82 publications

References 45 publications

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Room Temperature Fabrication of Stable, Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Achieved through Use of Primary Alcohols

Free and self-trapped exciton emission in perovskite CsPbBr₃ microcrystals

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Self-trapped excitons in two-dimensional perovskites

Cited by 82 publications

References 45 publications

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Full‐Stokes Polarimeter Based on Chiral Perovskites with Chirality and Large Optical Anisotropy

Room Temperature Fabrication of Stable, Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Achieved through Use of Primary Alcohols

Free and self-trapped exciton emission in perovskite CsPbBr3 microcrystals

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Free and self-trapped exciton emission in perovskite CsPbBr₃ microcrystals