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A Novel and Cost-Effective CsVO₃ Quantum Dots for Optoelectronic and Display Applications.

ABSTRACT: Quantum dots (QDs) have an unparalleled ability to mimic true colors due to their size-tunable optical and electronic properties, which make them the most promising nanoparticles in various fields. Currently, the majority of QDs available in the market are cadmium, indium, and lead-based materials but the toxicity and unstable nature of these QDs restricts their industrial and practical applications. To avoid using heavy metal ions, especially cadmium, the current research is focused on the fabrication of perovskite and vanadate QDs. Herein, we report the facile synthesis of a novel and cost-effective CsVO₃ QDs for the first time. The sizes of the CsVO₃ QDs produced were tuned from 2 to 10 nm by varying the reaction temperature from 140 to 190 °C. On increasing QD size, a continuous red shift was observed in absorption and emission spectra, signifying the presence of quantum confinement. In addition, along with CsVO₃ QDs, the CsVO₃ nanosheets self-assembled microflower-like particles were found as residue after the centrifugation; the X-ray diffraction indicated an orthorhombic structure. Under 365 nm excitation, these CsVO₃ microflower-like particles exhibited broad emission with CIE coordinates in the white emission region. The acquired results suggest that CsVO₃ QDs may represent a new class of cadmium-free materials for optoelectronic and biomedical applications.

SUBMITTER: Raju GSR

PROVIDER: S-EPMC9412482 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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A Novel and Cost-Effective CsVO<sub>3</sub> Quantum Dots for Optoelectronic and Display Applications.

Raju Ganji Seeta Rama GSR Varaprasad Ganji Lakshmi GL Lee Jeong-Hwan JH Park Jin Young JY Chodankar Nilesh R NR Ranjith Kugalur Shanmugam KS Pavitra Eluri E Huh Yun Suk YS Han Young-Kyu YK

Nanomaterials (Basel, Switzerland) 20220819 16

Quantum dots (QDs) have an unparalleled ability to mimic true colors due to their size-tunable optical and electronic properties, which make them the most promising nanoparticles in various fields. Currently, the majority of QDs available in the market are cadmium, indium, and lead-based materials but the toxicity and unstable nature of these QDs restricts their industrial and practical applications. To avoid using heavy metal ions, especially cadmium, the current research is focused on the fabr ...[more]

PMID: 36014727

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Project description:Low-toxic and efficient fluorescent core-shell CuInS2/ZnS (CIS/ZnS) quantum dots (QDs) are good candidates for optoelectronic device applications. They are synthesized in a hydrophobic environment, while large amounts of organic solvents used in the preparation of fluorescent films have significant problems on environmental load and human health. CIS/ZnS QDs hydrophilized by adsorbing 3-mercaptopropionic acid on their surfaces can be used in the aqueous film fabrication process. In this work, the aqueous electrophoretic deposition (EPD) of the hydrophilized QDs with silicone-modified acrylic resin nanoparticles was performed to fabricate fluorescent nanocomposite films. The hydrophilized QDs and resin nanoparticles were simultaneously dispersed in basic aqueous solutions due to electrostatic repulsion resulting from their negatively charged surfaces. Transparent films were obtained on a transparent conductive substrate at the anode side by the EPD. They showed yellow fluorescence of the QDs. The thickness increased with increasing the deposition time; however, hemispherical holes attributed to oxygen gas generated by water electrolysis were observed at the longer time. The electron microscopy revealed that the films were densely and homogeneously deposited. The QDs were dispersed around the resin nanoparticles without aggregation. The fluorescence (FL) quantum yield was 43%. The optical absorption peak and FL intensity of the QDs increased accompanied by the film growth. The nanocomposite film showed good heat resistance at 80-120 °C for 5 h; therefore, the prepared films have feasibility in white light-emitting diode (LED) applications. A lightening device structured with the obtained EPD film placed on a blue LED successfully emitted white light. In addition, the flexibility of the nanocomposite film was demonstrated. The aqueous EPD method would be one of the suitable methods for the industrial production of fluorescent QD films. This technique can be applied to other hydrophilic fluorescent QDs with charged surfaces. Realization of various fluorescent QD films would expand the application possibilities.

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A Novel and Cost-Effective CsVO₃ Quantum Dots for Optoelectronic and Display Applications.

Publications

A Novel and Cost-Effective CsVO<sub>3</sub> Quantum Dots for Optoelectronic and Display Applications.

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Dataset Information

A Novel and Cost-Effective CsVO3 Quantum Dots for Optoelectronic and Display Applications.

Publications

A Novel and Cost-Effective CsVO<sub>3</sub> Quantum Dots for Optoelectronic and Display Applications.

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OmicsDI is part of the ELIXIR infrastructure

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A Novel and Cost-Effective CsVO₃ Quantum Dots for Optoelectronic and Display Applications.