Preparation of highly emissive and reproducible Cu–In–S/ZnS core/shell quantum dots with a mid-gap emission character

Jawhar, Nawzad Nadhim; Soheyli, Ehsan; Yazıcı, Ahmet Faruk; Mutlugün, Evren; Sahraei, Reza

doi:10.1016/j.jallcom.2020.153906

Cited by 20 publications

(9 citation statements)

References 37 publications

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“…The best PL emission intensity was obtained for an excitation wavelength of 380 with full-width at half maximum (FWHM) of about 37 nm. Both of these emission characteristics differ from those reported for other NC structures like I-III-VI which possess a larger shift, and a wider PL profile [21]. Finally, the relatively narrow emission profile demonstrates the purity of the emitted color, which is suitable for lighting and display applications.…”

Section: Optical Analysiscontrasting

confidence: 67%

Highly luminescent ZnCdTeS nanocrystals with wide spectral tunability for efficient color-conversion white-light-emitting-diodes

Soheyli¹,

Zargoush²,

Yazıcı³

et al. 2021

J. Phys. D: Appl. Phys.

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CdTe-based semiconductor nanocrystals (NCs) with size and composition-dependent efficient bandgap properties are historically mature nanomaterials for colloidal optoelectronic applications. In this work, we present the highly luminescent quaternary ZnCdTeS NCs with tunable emission across a wide visible spectrum from green to red spectral range. Prepared via a direct aqueous-based approach, a second capping agent of trisodium citrate (TSC) was used to enhance the photoluminescence (PL) emission efficiency, the chemical stability, and to spectrally widen the coverage of the emission spectra of ZnCdTeS NCs. Adding TCS created a remarkable blue shift from 572 nm in the absence of TSC, to 548 nm. On the other hand, upon optimization of experimental parameters, superior ZnCdTeS NCs with a narrow PL profile typically less than 50 nm, the high quantum efficiency of 76%, and tunable emission from 515-to-645 nm were synthesized in an aqueous solvent. The keynotes were the superior and reproducible luminescent properties for the core only NCs, without shell and using relatively low reaction temperatures. It was shown that in the suggested synthesis method, the high efficiency emitted color of ZnCdTeS NCs can be easily controlled from 515-to-650 nm with excellent stability against harsh conditions. The biexponential decay profiles of samples prepared at different reaction temperatures demonstrated that the average recombination lifetime is below 40 ns and increases with the growth of the ZnCdTeS NCs. Results reveal that the excitonic energy levels have the main role in the recombination process. Finally, to demonstrate the functional advantages of the prepared NCs in optoelectronics, the NCs were used to fabricate color-conversion white light-emitting diodes. The color coordinate of the device is recorded as (0.4951, 0.3647) with CRI of 91, CCT of 1954 K, and LER of 251 lm W −1 by employing only two distinct emitters for color conversion.

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Section: Optical Analysiscontrasting

confidence: 67%

Highly luminescent ZnCdTeS nanocrystals with wide spectral tunability for efficient color-conversion white-light-emitting-diodes

Soheyli¹,

Zargoush²,

Yazıcı³

et al. 2021

J. Phys. D: Appl. Phys.

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“…Klimov et al [96] explained the key role of copper deficiency as intergap emission centers for CIS QDs. Jawahar et al [4] also studied the dependence of the Cu/In ratio (0.7:100, 3:100, 6:100, 12:100, 18:100). By increasing the Cu content, there was a red shift in absorption spectra and absorption edge wavelength.…”

Section: Tuning Of Optical Properties Of Cis Qdsmentioning

confidence: 99%

“…Semiconductor nanoparticles, also referred to as zero-dimensional material or quantum dots (QDs), have gained significant interest in many areas of applications ranging from water to energy, sensing and biological applications due to their quantum confinement effect [1][2][3][4]. Compared to conventional organic dyes, QDs exhibit high photostability and tunable optical properties by changing the size and composition [5].…”

Section: Introductionmentioning

confidence: 99%

The Photoluminescence and Biocompatibility of CuInS2-Based Ternary Quantum Dots and Their Biological Applications

Rajendran

Oluwafemi

2020

Chemosensors

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Semiconductor quantum dots (QDs) have become a unique class of materials with great potential for applications in biomedical and optoelectronic devices. However, conventional QDs contains toxic heavy metals such as Pb, Cd and Hg. Hence, it is imperative to find an alternative material with similar optical properties and low cytotoxicity. Among these materials, CuInS2 (CIS) QDs have attracted a lot of interest due to their direct band gap in the infrared region, large optical absorption coefficient and low toxic composition. These factors make them a good material for biomedical application. This review starts with the origin and photophysical characteristics of CIS QDs. This is followed by various synthetic strategies, including synthesis in organic and aqueous solvents, and the tuning of their optical properties. Lastly, their significance in various biological applications is presented with their prospects in clinical applications.

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“…QDs come in various structures, including the new Ternary I-III-VI type, which is a safer alternative to heavy metal-containing QDs. Copper indium sulfide (CIS) structures [17], with atoms arranged in a crystal lattice, are crucial for modern technologies. By altering the size of CIS QDs, their band gap can be adjusted, making them highly adaptable for use in solar cells [18] and LEDs [19], leading to more efficient devices with greater color variety.…”

Section: Introductionmentioning

confidence: 99%

Quantum dots: an overview of synthesis, properties, and applications

Agarwal

Rai

Mondal

2023

Mater. Res. Express

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Quantum dots (QDs) have sparked great interest due to their unique electronic, optical, and structural properties. In this review, we provide a critical analysis of the latest advances in the synthesis, properties, and applications of QDs. We discuss synthesis techniques, including colloidal and hydrothermal synthesis, and highlight how the underlying principles of these techniques affect the resulting properties of QDs. We then delve into the wide range of applications of QDs, from QDs based color conversion, light-emitting diodes and biomedicine to quantum-based cryptography and spintronics. Finally, we identify the current challenges and future prospects for quantum dot research. By reading this review, readers will gain a deeper understanding of the current state-of-the-art in QDs research and the potential for future development.

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Preparation of highly emissive and reproducible Cu–In–S/ZnS core/shell quantum dots with a mid-gap emission character

Cited by 20 publications

References 37 publications

Highly luminescent ZnCdTeS nanocrystals with wide spectral tunability for efficient color-conversion white-light-emitting-diodes

Highly luminescent ZnCdTeS nanocrystals with wide spectral tunability for efficient color-conversion white-light-emitting-diodes

The Photoluminescence and Biocompatibility of CuInS2-Based Ternary Quantum Dots and Their Biological Applications

Quantum dots: an overview of synthesis, properties, and applications

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