Stability enhancement of Cs3Cu2I5 powder with high blue emission realized by Na+ doping strategy

Xie, Lijing; Chen, Bingkun; Zhang, Fa; Zhao, Ziqi; Jiang, Ting; Wang, Min; Wu, Yafeng; Huang, Lingling; Song, Weitao; Liu, Yue; Wang, Yongtian

doi:10.1016/j.jlumin.2021.118333

Cited by 25 publications

(21 citation statements)

References 45 publications

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“…Copper-based perovskites can circumvent the issues described above because copper is an earth-abundant and relatively less toxic element. Moreover, it induces excellent optical emission by replacing lead elements in the perovskite structure. − Moreover, zero-dimensional (0D) Cs 3 Cu 2 X 5 lead-free metal halides show unique optical features, such as a wide bandgap energy, a large Stokes shift, and an intriguing self-trap exciton (STE) emission from the lattice deformation of metal halide structures. − Cs 3 Cu 2 I 5 is a typical structure in this fascinating family, in which copper atoms are coordinated 4-fold with iodine anions to form a tetrahedron (Cu 2 I 5 3– ) and isolated by cesium cations. − The synthesis and optical properties of 0D Cs 3 Cu 2 I 5 NCs have been reported. − In addition, the size of Cs 3 Cu 2 I 5 NCs could be controlled by varying the ligand composition or the amount of iodine during the reaction process. On the contrary, the insufficient synthetic reaction of the Cs 3 Cu 2 I 5 NCs and difficulties in controlling the size and uniformity of the NC ensemble have been major obstacles hindering application of the devices and fundamental studies.…”

Section: Introductionsupporting

confidence: 92%

Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

Cho

Kim

et al. 2022

Chem. Mater.

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Lead-free copper-based perovskite Cs 3 Cu 2 X 5 nanocrystals (NCs) have attracted a great deal of attention as novel active materials in optoelectronic devices because of their high emission stability, unique self-trap exciton emission, and high quantum yield, as well as their relatively low toxicity and earthabundant constituents. On the contrary, despite the widespread interest in Cs 3 Cu 2 X 5 bulk or thin-film structures, the synthesis of highly crystalline and uniform Cs 3 Cu 2 X 5 NCs in high yield has rarely been reported on the basis of the conventional growth kinetics because of our insufficient understanding of their formation mechanism. We report a strategy for increasing the yield and controlling the size of Cs 3 Cu 2 X 5 NCs by utilizing the metal halide additive to adjust the thermodynamic equilibrium and chemical potential. Monodisperse Cs 3 Cu 2 I 5 nanocubes with a photoluminescence quantum yield of 72.4% could be obtained because of the unique properties of MnI 2 , which can form multiple ionic salts and promote the reaction of CuI with a ligand to form Cu oleate-rich conditions for the assembly of NCs. Therefore, the metal halide additive plays a critical role in increasing the synthesis yield and controlling the size of copper-based Cs 3 Cu 2 I 5 NCs based on precise mechanistic studies.

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Section: Introductionsupporting

confidence: 92%

Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

Cho

Kim

et al. 2022

Chem. Mater.

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“…In order to further improve the luminescence efficiency of Cs 3 Cu 2 X 5 perovskites, pressure-assisted cooling, rare-earth element doping, alkali-metal cation doping, and other strategies have been reported. 20–23 For instance, Xie et al reported that the PL intensity of a Cs 3 Cu 2 I 5 sample was improved by 17.4% via an Na + doping strategy. 22 Gao et al demonstrated an InI 3 -assisted strategy to improve the PLQY of Cs 3 Cu 2 I 5 to 96.6%.…”

Section: Introductionmentioning

confidence: 99%

A-site FA⁺engineering boosting photoluminescence efficiency and stability of cesium copper iodine (Cs₃Cu₂I₅) perovskites

Fan

Yang

et al. 2023

J. Mater. Chem. C

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“…Even for other lead-free perovskites and derivatives, there are a few studies on their polarization-sensitive photodetection property, , but no reports about their polarized emission. According to the previous works on Cs 3 Cu 2 I 5 , we can find that the as-fabricated Cs 3 Cu 2 I 5 exhibits the main morphologies of microcrystals, microparticles, nanoparticles, and quantum dots, all showing a random orientation or disordered shape. ,− It is still a great challenge to develop an effective and facile route to obtain Cs 3 Cu 2 I 5 with highly ordered anisotropic nanostructures for polarization luminescence generation.…”

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confidence: 99%

In Situ Fabrication of Lead-Free Cs₃Cu₂I₅ Nanostructures Embedded in Poly(Vinylidene Fluoride) Electrospun Fibers for Polarized Emission

Jiang

Wang

Xie

et al. 2022

ACS Appl. Nano Mater.

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Polarized emissive materials with anisotropic nanostructures have attracted tremendous attention as potential substitutes for polarizers. Herein, the electrospinning technique is adopted to realize in situ fabrication of lead-free halide Cs 3 Cu 2 I 5 nanostructures embedded in poly(vinylidene fluoride) (PVDF) micro/ nanofiber films for polarized luminescence generation, with a photoluminescence quantum yield (PLQY) of 33.3−86.1%. The functionality of the polymer PVDF as a protector and its interactions with Cs 3 Cu 2 I 5 were demonstrated. The Cs 3 Cu 2 I 5 /PVDF composite nanofibers exhibit a higher degree of PL polarization ratio (P) than that of composite microfibers, reaching a highest P of 0.4 and long-term stability. This polarized emission is attributed to the directional transition dipole moment (TDM) induced by the asymmetric crystal structure of aligned Cs 3 Cu 2 I 5 nanorods and dielectric confinement effect of the PVDF matrix. The universality of the in situ electrospinning preparation strategy is confirmed by the fabrication of a Cs 3 Cu 2 I 5 /PVA fiber film with a P of 0.5. The reported Cs 3 Cu 2 I 5 /polymer nanofiber films with bright and highly polarized light emissions will have great potential for optoelectronic applications such as liquid crystal display (LCD) backlighting, spectrum splitting, waveguides, lasers, and polarized photodetectors.

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Stability enhancement of Cs3Cu2I5 powder with high blue emission realized by Na+ doping strategy

Cited by 25 publications

References 45 publications

Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

A-site FA⁺engineering boosting photoluminescence efficiency and stability of cesium copper iodine (Cs₃Cu₂I₅) perovskites

In Situ Fabrication of Lead-Free Cs₃Cu₂I₅ Nanostructures Embedded in Poly(Vinylidene Fluoride) Electrospun Fibers for Polarized Emission

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Stability enhancement of Cs3Cu2I5 powder with high blue emission realized by Na+ doping strategy

Cited by 25 publications

References 45 publications

Monodisperse Lead-Free Perovskite Cs3Cu2I5 Nanocrystals: Role of the Metal Halide Additive

Monodisperse Lead-Free Perovskite Cs3Cu2I5 Nanocrystals: Role of the Metal Halide Additive

A-site FA+engineering boosting photoluminescence efficiency and stability of cesium copper iodine (Cs3Cu2I5) perovskites

In Situ Fabrication of Lead-Free Cs3Cu2I5 Nanostructures Embedded in Poly(Vinylidene Fluoride) Electrospun Fibers for Polarized Emission

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Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

Monodisperse Lead-Free Perovskite Cs₃Cu₂I₅ Nanocrystals: Role of the Metal Halide Additive

A-site FA⁺engineering boosting photoluminescence efficiency and stability of cesium copper iodine (Cs₃Cu₂I₅) perovskites

In Situ Fabrication of Lead-Free Cs₃Cu₂I₅ Nanostructures Embedded in Poly(Vinylidene Fluoride) Electrospun Fibers for Polarized Emission