Adjusting the band gap of CsPbBr3−yXy (X = Cl, I) for optimal interfacial charge transfer and enhanced photocatalytic hydrogen generation

Knezevic, Marija; Quach, Duong Vien; Lampre, Isabelle; Erard, Marie; Pernot, Pascal; Bérardan, David; Colbeau‐Justin, Christophe; Ghazzal, Mohamed Nawfal

doi:10.1039/d2ta09920a

Cited by 16 publications

(11 citation statements)

References 53 publications

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“…The Tauc plots of undoped CsPbBr 3 and Eu-doped CsPbBr 3 NCs are shown in the inset of Figure (a) and (b), respectively. The obtained E g value for the CsPbBr 3 NCs is 2.31 eV, in good agreement with the reported data . The E g value increases on incorporating the Eu ion into the CsPbBr 3 , and the obtained E g value for the Eu-doped CsPbBr 3 NCs is 2.35 eV.…”

Section: Resultssupporting

confidence: 90%

“…The obtained E g value for the CsPbBr 3 NCs is 2.31 eV, in good agreement with the reported data. 28 The E g value increases on incorporating the Eu ion into the CsPbBr 3 , and the obtained E g value for the Eu-doped CsPbBr 3 NCs is 2.35 eV. A minute increase in the E g value may be due to the decrease in particle size in the case of Eu-doped CsPbBr 3 compared to the undoped one as obtained by HR-TEM analysis.…”

Section: Uv−visible Absorption Spectroscopymentioning

confidence: 65%

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Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Kachhap,

Fatima,

Yadav

et al. 2023

ACS Appl. Opt. Mater.

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We report blue emission, along with the characteristic green emission, in CsPbBr 3 nanocrystals (NCs) due to the doping of Eu 2+ ions. The doping of Eu 2+ was confirmed using TEM-EDAX, FTIR, and XPS techniques. The undoped CsPbBr 3 NCs show sharp green emission peaking at 515 nm (fwhm ∼24 nm). Whereas Eu 2+ :CsPbBr 3 NCs show two emission peaks at 498 and 442 nm with fwhm ∼20 and ∼13 nm, respectively. A shift in the green emission of doped NCs is because of reduced average particle size from 19 to 7 nm. The additional emission peak at 442 nm is assigned due to the 4f 6 ( 7 F J )5d 1 → 4f 7 transition of Eu 2+ ions. The intensities of blue and green emissions are both significantly influenced by changing the excitation wavelengths. The decay dynamics study suggests an energy transfer from CsPbBr 3 to the Eu 2+ ions. It is also inferred that Eu 2+ doping improves the radiative channels. Further, the CIE coordinate analysis depicts virtuous luminous efficacy of the optical radiation and significant color purity (>85%) of the emission spectra under different excitations. These optical studies show that the Eu 2+ :CsPbBr 3 NCs can be a potential candidate for multicolor LEDs, displays, and anticounterfeiting applications.

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Section: Resultssupporting

confidence: 90%

Section: Uv−visible Absorption Spectroscopymentioning

confidence: 65%

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Kachhap,

Fatima,

Yadav

et al. 2023

ACS Appl. Opt. Mater.

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“…Lead-based halide perovskites have attracted excellent attention in different fields of study owing to their unprecedented photoelectric properties, such as large absorption coefficients, 1–3 high charge-carrier mobility, 4,5 long electron–hole diffusion, 6 and tunable band gaps. 7 In the last decade, the research on lead-based perovskites has experienced a boom period, with corresponding breakthroughs in photoelectric devices such as lasers, 8,9 photodetectors, 10,11 light-emitting diodes (LEDs) 12,13 and solar cells.…”

Section: Introductionmentioning

confidence: 99%

Phase transition and rapid temperature response of lead-free perovskite Cs–Cu–I nanocrystals enabled by their size

Chen,

Li,

Yin

et al. 2023

J. Mater. Chem. C

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“…3 The chemical and structural diversity of these materials makes them suitable for a wide range of optoelectronic applications. 4 Among them, all-inorganic metal halide perovskites, such as CsPbX 3 (X = Cl, Br, and I), exhibit high emission color purity, 5 tunable optical bandgaps, 6 and high photoluminescence quantum yields (PLQYs). 7,8 These unique properties have set them apart as promising semiconductor materials in numerous potential applications in both light emission and photovoltaics, leading to significant advancements in high-performance optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

CsPbBr₃ Nanorod Luminescent Property Study

Liu,

Wang,

Lai

et al. 2024

J. Phys. Chem. C

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In recent years, metal halide perovskite materials have garnered significant attention due to their low cost, high absorption coefficient, tunable bandgap, and high fluorescence quantum yield. These materials have found wide applications in optoelectronic devices, bioimaging, and solar cells. However, the instability of organic− inorganic hybrid perovskites has led to a shift in focus toward metal halide perovskites. These materials offer the advantages of simple preparation and tunable morphology, making them promising for various optoelectronic applications. Different morphologies of metal halide perovskite materials include quantum dots, nanowires, nanorods, and nanoplates, and these morphological differences can impact their photoluminescence properties. In this study, we successfully prepared CsPbBr3 nanorods using an elemental exchange method. Compared with traditional hot-injection methods, this approach allows for easier control of the nanorod morphology. These nanorods exhibited higher fluorescence intensity, improved fluorescence quantum yield, and enhanced photoluminescence lifetime compared to traditional nanocrystals. Therefore, this method of preparing nanorods presents a new direction for the development of metal halide perovskite optical materials.

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Adjusting the band gap of CsPbBr_3−yX_y (X = Cl, I) for optimal interfacial charge transfer and enhanced photocatalytic hydrogen generation

Abstract: Metal halide perovskites (MHP, CsPbX3: X = Cl, Br, I) demonstrate high photogenerated charge-carrier production and mobility, which makes them promising candidates for photocatalysis. In this work, we investigated how...

Cited by 16 publications

References 53 publications

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Phase transition and rapid temperature response of lead-free perovskite Cs–Cu–I nanocrystals enabled by their size

CsPbBr₃ Nanorod Luminescent Property Study

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Adjusting the band gap of CsPbBr3−yXy (X = Cl, I) for optimal interfacial charge transfer and enhanced photocatalytic hydrogen generation

Abstract: Metal halide perovskites (MHP, CsPbX3: X = Cl, Br, I) demonstrate high photogenerated charge-carrier production and mobility, which makes them promising candidates for photocatalysis. In this work, we investigated how...

Cited by 16 publications

References 53 publications

Expanding the Emission of CsPbBr3 Nanocrystals in the Blue Region

Expanding the Emission of CsPbBr3 Nanocrystals in the Blue Region

Phase transition and rapid temperature response of lead-free perovskite Cs–Cu–I nanocrystals enabled by their size

CsPbBr3 Nanorod Luminescent Property Study

Contact Info

Product

Resources

About

Adjusting the band gap of CsPbBr_3−yX_y (X = Cl, I) for optimal interfacial charge transfer and enhanced photocatalytic hydrogen generation

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

CsPbBr₃ Nanorod Luminescent Property Study