Journal
JOURNAL OF LUMINESCENCE
Volume 255, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2022.119544
Keywords
Colloidal quantum dots; Intrinsic and extrinsic defects; Microstructural defects; Nanotwinning; Radiative and non -radiative emission
Categories
Ask authors/readers for more resources
The influence of copper as a metallic dopant on the properties of CdS colloidal quantum dots (CQDs) prepared by chemical co-precipitation method is investigated. Dopant induced changes in microstructural defects, twinning angle, stress generation, and emission behavior are noticed. The substitution of Cu in mixed oxidation states and the competitive intensity variation between band edge emission and intrinsic defect assisted emission are observed.
The influence of copper as a metallic dopant on the properties of CdS colloidal quantum dots (CQDs) prepared by chemical co-precipitation method is investigated here. Dopant induced change in microstructural defects type, density, twinning angle, stress generation and some unusual emission behaviour are noticed. Besides, the substitution of Cu in mixed oxidation states i.e. Cu+ and Cu2+ with dominating nature of Cu+ is confirmed by x-ray photoelectron spectroscopy (XPS) studies. The crystallite sizes observed by transmission electron microscopy (TEM) are well supported by the sizes estimated using Scherer formula and are found to be either below or comparable to Bohr excitation radius of bulk CdS. A competitive intensity variation between band edge emission and intrinsic defect assisted emission without generation/contribution of extrinsic defect sponsored emission is observed. The microstructural defects (nanotwinning angle) and related stress may be the possible sources of variation in crystallite size, crystallinity and uncommon recombination process in the CQDs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available