Up-Scalable Synthesis of Size-Controlled White-Green Emitting Behavior of Core/Shell (CdSe/ZnS) Quantum Dots for LED Applications

G Ramalingam; C Ragupathi; K Kaviyarasu; D Letsholathebe; S B Mohamed; C Maria Magdalane; G T Mola; Abdulgalim B Isaev; M Maaza

doi:10.1166/jnn.2019.16298

Up-Scalable Synthesis of Size-Controlled White-Green Emitting Behavior of Core/Shell (CdSe/ZnS) Quantum Dots for LED Applications

J Nanosci Nanotechnol. 2019 Jul 1;19(7):4026-4032. doi: 10.1166/jnn.2019.16298.

Authors

G Ramalingam¹, C Ragupathi², K Kaviyarasu³, D Letsholathebe⁴, S B Mohamed⁵, C Maria Magdalane⁶, G T Mola⁷, Abdulgalim B Isaev⁸, M Maaza³

Affiliations

¹ Department of Nanoscience and Technology, Science Campus, Alagappa University, Karaikudi 630003, Tamil Nadu, India.
² Department of Chemistry, Sriram College of Arts and Science, Veempattu, Chennai 602024, India.
³ The United Nations Educational, Scientific and Cultural Organization - African Nanotechnology Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa.
⁴ Department of Physics, University of Botswana, Private Bag 0022, Gaborone, Botswana.
⁵ Department of Materials Science, Central University of Tamil Nadu, Neelakudi, Thiruvarur 610005, Tamil Nadu, India.
⁶ Department of Chemistry, St. Xavier's College (Autonomous), Tirunelveli 627002, India.
⁷ School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa.
⁸ Department of Environmental Chemistry and Technology, Dagestan State University, M. Gadjieva, 43a, 367001, Makhachkala, Russia Federation.

PMID: 30764965
DOI: 10.1166/jnn.2019.16298

Abstract

Research on CdSe/ZnS core-shell quantum dots (QDs) was synthesized by a chemical route using bio-conjugated organic amino acid (L-Cysteine). The structural, morphological, and optical properties of the nanocrystal powder samples were analyzed using various characterization techniques. The diameter of the resulting QDs was about 3 nm with uniform size distribution. The optical properties QDs exhibited an absorption and emission peak at 515 and 525 nm respectively, at room temperature. The QDs through emission in the spectral range at 516-535 nm is special for their application in green LEDs and white-light generation. The high optical properties performance of the QDs nanocomposites gained indicates that the materials are promising for (LED) applications.

Publication types

Research Support, Non-U.S. Gov't