Facile preparation of yellow and red emitting ZnCdSeS quantum dots and their third-order nonlinear optical properties

Moslemi, Z.; Soheyli, Ehsan; Ara, M.H. Majles; Sahraei, Reza

doi:10.1016/j.jpcs.2018.04.017

Cited by 11 publications

(9 citation statements)

References 41 publications

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“…The power corresponds to an energy density of approximately 4 kW/cm 2 and it is also sufficient to generate nonlinear effects. Such observations have been reported previously by us as well as by other research groups …”

Section: Resultssupporting

confidence: 92%

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Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

et al. 2021

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Zinc telluride (ZnTe) quantum dots (QDs) were synthesized by a unique supersaturation-controlled aqueous route. For a given pH, increasing the degree of initial supersaturation led to a decrease in the average diameter (d avg) of the QDs and increased monodispersity. Three samples of ZnTe QDs having average sizes of 0.8, 1.7, and 2.2 nm were synthesized (hence named ZnTe_0.8, ZnTe_1.7, and ZnTe_2.2). Nonlinear absorption (NLA) and nonlinear refraction (NLR) of these colloidal ZnTe QDs of different sizes were investigated by the Z-scan technique using a continuous He–Ne laser (632.8 nm, 15 mW). Isotropic assembly of ZnTe_2.2 leads to the formation of nanoballs (hence named ZnTe_NB). The NLA profile of smaller QDs, ZnTe_1.7 and ZnTe_0.8, was found to follow a three-photon absorption (3PA) model, while relatively bigger QDs, ZnTe_2.2, followed a two-photon absorption (2PA) model. On moving from ZnTe_0.8 to ZnTe_1.7, the three-photon absorption coefficient (γ) decreases by 26% (3.00 × 10–4 → 2.21 × 10–4 cm3/MW2). The two-photon absorption coefficient (β) for ZnTe_2.2 is 0.3 cm/MW. For a 63% decrease in average diameter (2.2 → 0.8 nm), the refractive index (n 2) increases by 45% (2.48 × 10–2 → 3.6 × 10–2 cm2/MW). Overall, the NLR coefficient shows a decreasing trend with size. Upon isotropic self-assembly, ZnTe_NB, there is a significant increase in the NLR coefficient by 40% (2.48 × 10–2 → 3.48 × 10–2 cm2/MW) and a simultaneous decrease in the NLA coefficient by 45% (0.3 → 0.166 cm/MW). The figure of merit was also determined for all of the samples, and it was found that ZnTe_2.2 and ZnTe_0.8 were best suited for all-optical device applications. Further, the self-assembled nanostructures are promising for making optical waveguides for supercontinuum generation (SCG).

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Section: Resultssupporting

confidence: 92%

“…Such observations have been reported previously by us 32 as well as by other research groups. 36 3.2.2. Nonlinear Refraction (NLR).…”

Section: Resultsmentioning

confidence: 84%

Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

et al. 2021

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“…The strong quantum confinement effect and high surface to volume ratio exhibited by the quantum dots extends their possibilities in the nonlinear optical filed. Quantum dots are promising nonlinear materials, which can be chosen for optical limiters, switches, optical modulators and signal processing applications [3,4]. The II-VI category semiconductor quantum dots like ZnSe, ZnS,CdSe, CdTe, CdS etc.…”

Section: Introductionmentioning

confidence: 99%

“…The high quantum yield and stability made CdTe binary semiconductor much suitable for optical and luminescence applications apart from the toxicity. The ternary CdZnTe is an excellent candidate for the optical, electronic and nonlinear applications [1,3,7].…”

Section: Introductionmentioning

confidence: 99%

“…The high intense laser beams induce polarization in a nonlinear material which leads to second order or third order nonlinearity depending on the electric field strength [8]. There is verity of methods to study nonlinear effects such as wave mixing (DFWM), interferometry methods, second and harmonic generation methods and Z-scan method [3,5]. Among these methods, Z-scan analysis introduced by Bahae et al is an easy and effective method [9].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on nonlinear optical and optical limiting properties of Cd_0.7Zn_0.3Te quantum dots

John

Mathew

2022

J. Phys.: Conf. Ser.

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Ternary alloyed Cd0.7Zn0.3Te colloidal quantum dots were synthesized under open atmosphere conditions. The Cd0.7Zn0.3Te quantum dots were characterized under XRD studies, DLS technique and optical absorption measurements. Using tauc and urbach relation the optical energy bandgap and urbach energy were obtained. The intensity depended nonlinear optical parameters of Cd0.7Zn0.3Te quantum dots were determined with Z-scan experimental setup using a green laser source working on continuous wave mode. The nonlinear absorption coefficient β, along with optical limiting capacity of Cd0.7Zn0.3Te quantum dot is investigated through the open aperture set up. The transmittance of Cd0.7Zn0.3Te quantum dot showed a sharp dip at the maximum intensity point of the laser which indicates reverse saturable absorption. The optical limiting threshold value for Cd0.7Zn0.3Te quantum dot was obtained around 4.6 KJ/cm2. The nonlinear refractive index of Cd0.7Zn0.3Te quantum dot is find out using closed aperture set up. The nonlinear refractive index with a negative sign was obtained for the Cd0.7Zn0.3Te quantum dot which is attributed to the self-defocusing phenomena. The nonlinear studies indicate that the sample exhibits good nonlinear properties and find applications in optical limiting materials.

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A Salt‐Resistant and Antibacterial Cu₂ZnSnS₄‐Based Hydrogel for High Efficient Photothermal Distillation in Seawater Desalination and Sewage Purification

Liu

Wang

et al. 2023

ChemSusChem

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Solar steam generation technology (SSGT) using unlimited solar energy is regarded as one of the most promising sustainable technologies to produce clean water. However, most of studies on SSGT simply focus on how to improve salt resistance as well as exclude inorganic and organic pollutants in targeted water, and only very limited studies pay attention to the micro‐organisms in the collected water. Herein, one porous Cu2ZnSnS4‐based photothermal hydrogel (CZTS‐PH) with antibacterial properties as well as good salt resistance was successfully prepared. The CZTS‐PH was measured with the water evaporation rate as high as 3.249 kg m−2 h−1 and photothermal conversion efficiency of 96.3 % under one sun irradiation. Impressively, owing to the amino groups in the skeleton, CZTS‐PH can significantly deteriorate the cell membrane and lead to the death of the Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), which ensures its long‐term stability photothermal conversion and the safety of clean water. Overall, the admired photothermal conversion efficiency, and the excellent salt resistance and antibacterial performance suggest that CZTS‐PH could be a promising full‐scale device applied in seawater desalination and water purification.

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Facile preparation of yellow and red emitting ZnCdSeS quantum dots and their third-order nonlinear optical properties

Cited by 11 publications

References 41 publications

Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

Investigation on nonlinear optical and optical limiting properties of Cd_0.7Zn_0.3Te quantum dots

A Salt‐Resistant and Antibacterial Cu₂ZnSnS₄‐Based Hydrogel for High Efficient Photothermal Distillation in Seawater Desalination and Sewage Purification

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Facile preparation of yellow and red emitting ZnCdSeS quantum dots and their third-order nonlinear optical properties

Cited by 11 publications

References 41 publications

Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

Nonlinear Absorption and Refraction of Highly Monodisperse and Luminescent ZnTe Quantum Dots and Their Self-Assembled Nanostructures: Implications for Optoelectronic Devices

Investigation on nonlinear optical and optical limiting properties of Cd0.7Zn0.3Te quantum dots

A Salt‐Resistant and Antibacterial Cu2ZnSnS4‐Based Hydrogel for High Efficient Photothermal Distillation in Seawater Desalination and Sewage Purification

Contact Info

Product

Resources

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Investigation on nonlinear optical and optical limiting properties of Cd_0.7Zn_0.3Te quantum dots

A Salt‐Resistant and Antibacterial Cu₂ZnSnS₄‐Based Hydrogel for High Efficient Photothermal Distillation in Seawater Desalination and Sewage Purification