Tunable CsPb(Br/Cl)<sub>3</sub>perovskite nanocrystals and further advancement in designing light emitting fiber membranes

Abir, Sk Shamim Hasan; Gupta, Santosh K.; Ibrahim, Ahmad; Srivastava, Bhupendra B.; Lozano, Karen

doi:10.1039/d1ma00183c

Cited by 20 publications

(14 citation statements)

References 63 publications

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“…The color coordinate diagram shows predominant green emission marked with the letter b (Figure d). ABO 3 perovskite crystals are known to possess abundant defects in their band gap owing to their very high structural flexibility. , Depending on their localization, they can be classified further as shallow and deep defects. Under exposure to UV photons (∼250 nm), these shallow and deep defects lead to creation of localized states in the band gap of BHO, and further inhomogeneous charge distribution leads to the formation of electron traps.…”

Section: Resultsmentioning

confidence: 99%

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

et al. 2022

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Materials with optical multifunctionality such as photoluminescence (PL), radioluminescence, and thermoluminescence (TL) are a boon for a sustainable society. BaHfO3 (barium hafnium oxide [BHO]) under UV irradiation demonstrated visible PL endowed by oxygen vacancies (OVs). Eu3+ doping in BHO (BHOE) introduces f-state impurity levels just below the conduction band for both Eu@Ba and Eu@Hf sites, causing efficient host-to-dopant energy transfer, generating intense 5D0 → 7F1 magnetic dipole transitions (MDT) with internal quantum yield of ∼70%. X-ray photoelectron spectroscopy and electron paramagnetic resonance showed the formation of OVs in both BHO and BHOE samples with more vacancies in the doped sample. The positron lifetime measurements suggested that Eu3+ ions are distributed at both Ba2+ and Hf4+ sites. The association of OVs with Hf4+ and Eu3+ ions due to high charge/radius ratio is considered to be responsible for lowering the symmetry around Eu3+ ions to C 4v in BHOE. Density functional theory studies of defect formation energy justified the same. Time-resolved emission spectroscopy showed distinct spectra for Eu@Ba and Eu@Hf sites corresponding to symmetric and asymmetric environments, respectively. This could be highly relevant in designing color tunable phosphor by forcing dopant ions at one specific site because Eu@Ba displayed orange emission whereas Eu@Hf displayed red emission. We could further harness BHOE for X-ray scintillator application by designing a thin film, which showed efficient conversion of high-energy X-ray into visible light. Under beta irradiation; both BHO and BHOE showed distinct TL glow curves as shallow traps were formed in the former and deep traps in the latter, which could have long-term implications in harnessing this material for persistent luminescence. We believe that BHO/BHOE demonstrated an extraordinary credential as a perovskite for multifunctional applications in the area of defect-induced light emission, UV phosphor, X-ray scintillator, and TL crystals.

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Section: Resultsmentioning

confidence: 99%

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

et al. 2022

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“…Semiconductor nanocrystals are excellent luminophore candidates to be used in LSD layers. Amid these, inorganic metal halide perovskites have gained much interest due to their excellent optoelectronic properties and wide range applications [ 6 , 7 , 8 ]. These materials have a crystal structure similar to calcium titanate, CaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

Parylene-Sealed Perovskite Nanocrystals Down-Shifting Layer for Luminescent Spectral Matching in Thin Film Photovoltaics

et al. 2023

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The present contribution aims to enhance solar cells’ performance via the development of advanced luminescent down-shifting based on encapsulated nanostructured perovskite materials. Here, thin films of inorganic lead halide (CsPbBr3) perovskite nanocrystal luminophores were synthetized, by hot-injection, deposited on glass substrates by spin-coating, and encapsulated with parylene type C, via chemical vapor deposition, to protect and stabilize the films. The optical properties of these thin films were characterized by absorption, emission and 2D contour spectra, their structure by X-ray diffraction and X-ray photoelectron spectroscopy, and the morphology by Scanning Transmission Electron microscopy. I–V curve and spectral response nanocrystalline silicon photovoltaic (nc-Si:H PV) cells were studied in the absence and presence of the perovskite and parylene luminescent down-shifting layers. The incorporation of the CsPbBr3 nanocrystals and their encapsulation with the parylene type C polymeric coating led to an increase in the current generated and the spectral response of the PV cells in the regime of the nanocrystals’ fluorescence emission. A 3.1% increase in the short circuit current density and a 5.6% increase in the power conversion efficiency were observed.

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“…Within the same strategy for building a stretchable perovskite-based LED, the conformation of ultrathin CsPbBr 3 QD LEDs on the pre-stretched surface of the elastomer can be allowed to be repeatedly stretched to 20% strain for 1000 cycles with electroluminescent performance as high as 9.2 cd A –1 . Despite intensive research in this field, the concept of intrinsically large-strain stretchability, which is able to uniformly deform like an elastomer, , is still a main challenge for most of the CsPbBr 3 QD LEDs . On the other side, for most designs of stretchable light-emitting devices based on CsPbX 3 QDs, the major drawback is fabricated by blending elastomer material and CsPbX 3 QDs, which may be associated with a non-uniform phase separation domain after the serial stretching process, leading to the suppression of luminance efficiency .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Intrinsic, Elastic, Self-healing, and Luminescent CsPbBr₃ Quantum Dot-Polymer Composites via Thiol–Ene Cross-Linking

Hsu

You

Au‐Duong

et al. 2022

ACS Appl. Polym. Mater.

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Here, we offer a straightforward approach for making elastic, self-healing, and light-conversion material, in which CsPbBr 3 quantum dots (QDs) form a strong bond with a designed copolymer including elastic behavior based on the mechanical characteristics of polyisoprene and reversible bonding moieties for self-healing function. This designed composite film has highly luminescent and typically elastic properties, including good ultimate strength (∼0.14 N/mm 2 ) and high stretchability (∼486%). The copolymer matrix exhibited excellent compatibility with CsPbBr 3 QDs, in which they maintained their uniform distribution within the network after a serial stretching process due to the strong bond between copolymers and CsPbBr 3 QDs. Furthermore, the composite film dynamic network is capable of 90% self-healing efficiency at room temperature without the need of any healing stimulus, heat, plasticizer, or solvent. This simple method suggested a relatively easy approach to a stable, elastic, and luminescent CsPbBr 3 QD-based composite film that opens up the potential of fully stretchable light conversion material for light-emitting diodes.

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Tunable CsPb(Br/Cl)₃perovskite nanocrystals and further advancement in designing light emitting fiber membranes

Abstract: Cesium lead halide perovskite nanocrystals (NCs) have drawn a great deal of interest in optoelectronic and photonic applications due to their intrinsic and attractive photoluminescence properties. Though, their commercially viability...

Cited by 20 publications

References 63 publications

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Parylene-Sealed Perovskite Nanocrystals Down-Shifting Layer for Luminescent Spectral Matching in Thin Film Photovoltaics

Fabrication of Intrinsic, Elastic, Self-healing, and Luminescent CsPbBr₃ Quantum Dot-Polymer Composites via Thiol–Ene Cross-Linking

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Tunable CsPb(Br/Cl)3perovskite nanocrystals and further advancement in designing light emitting fiber membranes

Abstract: Cesium lead halide perovskite nanocrystals (NCs) have drawn a great deal of interest in optoelectronic and photonic applications due to their intrinsic and attractive photoluminescence properties. Though, their commercially viability...

Cited by 20 publications

References 63 publications

Harvesting Light from BaHfO3/Eu3+ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Harvesting Light from BaHfO3/Eu3+ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Parylene-Sealed Perovskite Nanocrystals Down-Shifting Layer for Luminescent Spectral Matching in Thin Film Photovoltaics

Fabrication of Intrinsic, Elastic, Self-healing, and Luminescent CsPbBr3 Quantum Dot-Polymer Composites via Thiol–Ene Cross-Linking

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Tunable CsPb(Br/Cl)₃perovskite nanocrystals and further advancement in designing light emitting fiber membranes

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Fabrication of Intrinsic, Elastic, Self-healing, and Luminescent CsPbBr₃ Quantum Dot-Polymer Composites via Thiol–Ene Cross-Linking