Surface ligand engineering involving fluorophenethyl ammonium for stable and strong emission CsPbBr<sub>3</sub> quantum dots and high-performance QLEDs

Zhang, Qiang; Jiang, Minghui; Yan, Guijun; Feng, Yaqing; Bao, Zhenan

doi:10.1039/d2tc00034b

Cited by 11 publications

(6 citation statements)

References 46 publications

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“…The four samples have similar diffraction peaks at 14.99, 21.50, 30.14, 33.71, and 43.74 • , which correspond to the (100), ( 110), ( 200), (210), and (220) crystal planes of the orthorhombic phase of CsPbBr 3 QDs. This indicates that SPLE do not affect the crystal structure of the QDs [32].…”

Section: Resultsmentioning

confidence: 88%

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Zhou,

Zhu,

Wang

et al. 2024

Nanotechnology

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CsPbBr3 quantum dots (QDs) have excellent optical properties and good phase stability, but the long-chain ligands on their surfaces affect the charge transfer between QDs. Here, we propose a simple ligand exchange strategy: solution-phase ligand exchange. By adding an acetone solution of phenylethylammonium bromide to the purification process of CsPbBr3 QDs, the long-chain ligands were effectively replaced and the electric coupling between QDs was improved. As a result, the power conversion efficiency of the solar cell was increased from 1.95% to 2.83%. Meanwhile, the stability of the devices was significantly improved in the unencapsulated case.

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Section: Resultsmentioning

confidence: 88%

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Zhou,

Zhu,

Wang

et al. 2024

Nanotechnology

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“…The vibrational energies corresponding to different functional groups present in the synthesized sample are listed in Table . The peak at 3433 cm –1 is the stretching vibration of N–H . This peak is also contributed by the O–H stretching vibration of the −OH functional group .…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 3433 cm −1 is the stretching vibration of N−H. 29 This peak is also contributed by the O−H stretching vibration of the −OH functional group. 30 The asymmetric and symmetric vibrations of the C−H bond, because of the long alkyl chain present in organic ligands OA and OAm, appear at 2924 and 2853 cm −1 , respectively.…”

Section: Ftir Studymentioning

confidence: 99%

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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“…Metal halide perovskite semiconductors have been actively studied for practical use as raw materials for solar cells [18][19][20][21][22][23][24]. They have also attracted attention as main constituents for lowcost, highly efficient, and flexible light-emitting devices because they allow the fabrication of high-quality luminescent thin films with excellent semiconductivity at relatively low temperatures using a simple coating process [25][26][27][28][29][30][31]. Recently, chiral perovskite quantum dots capable of exhibiting circularly polarized luminescence (CPL) have been reported [32].…”

Section: Introductionmentioning

confidence: 99%

Magnetically Induced Near-Infrared Circularly Polarized Electroluminescence from an Achiral Perovskite Light-Emitting Diode

Imai,

Amasaki,

Yanagibashi

et al. 2024

Magnetochemistry

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Circularly polarized electroluminescent devices are conventionally fabricated by incorporating an optically active chiral luminophore into their emission layer. Herein, we developed a circularly polarized perovskite light-emitting diode (PeLED) system with an optically inactive perovskite luminophore that can emit near-infrared circularly polarized electroluminescence (CPEL) upon application of an external magnetic field. The magnitude of the magnetic CPEL (gMCPEL) was in the order of 10−3 in the near-infrared wavelength range of 771–773 nm. Although the Pb perovskite quantum dots were achiral, the rotation direction of the CPEL of the magnetic circularly polarized PeLED system was successfully reversed by switching the Faraday geometry of the applied magnetic field. The use of achiral luminophores exhibiting magnetic-field-induced CPEL represents a new approach for the development of circularly polarized electroluminescent devices.

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Surface ligand engineering involving fluorophenethyl ammonium for stable and strong emission CsPbBr₃ quantum dots and high-performance QLEDs

Abstract: All-inorganic CsPbBr3 perovskite quantum dots (CsPbBr3 QDs) have become one of the most promising materials in the field of optoelectronics. However, the poor stabilities and low photoluminescence quantum yield (PLQY)...

Cited by 11 publications

References 46 publications

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Magnetically Induced Near-Infrared Circularly Polarized Electroluminescence from an Achiral Perovskite Light-Emitting Diode

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Surface ligand engineering involving fluorophenethyl ammonium for stable and strong emission CsPbBr3 quantum dots and high-performance QLEDs

Abstract: All-inorganic CsPbBr3 perovskite quantum dots (CsPbBr3 QDs) have become one of the most promising materials in the field of optoelectronics. However, the poor stabilities and low photoluminescence quantum yield (PLQY)...

Cited by 11 publications

References 46 publications

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr3 quantum dot solar cells

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr3 quantum dot solar cells

Expanding the Emission of CsPbBr3 Nanocrystals in the Blue Region

Magnetically Induced Near-Infrared Circularly Polarized Electroluminescence from an Achiral Perovskite Light-Emitting Diode

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Product

Resources

About

Surface ligand engineering involving fluorophenethyl ammonium for stable and strong emission CsPbBr₃ quantum dots and high-performance QLEDs

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Phenylethylammonium bromide-assisted solution-phase ligand exchange in CsPbBr₃ quantum dot solar cells

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region