Exploring the CdTe Quantum Dots in Ionic Liquids by Employing a Luminescent Hybrid of the Two

Poor solubility of the semiconductor quantum dots (QDs) severely restricts studies on these substances in room temperature ionic liquids (ILs). It also limits applications, which require both these promising classes of materials. In this work, a simple method employing a task-specific thiol-capped i...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2012-09, Vol.116 (38), p.20643-20650
Main Authors: Santhosh, Kotni, Samanta, Anunay
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Materials science
Molecular electronics, nanoelectronics
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Physics
Quantum dots
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:Poor solubility of the semiconductor quantum dots (QDs) severely restricts studies on these substances in room temperature ionic liquids (ILs). It also limits applications, which require both these promising classes of materials. In this work, a simple method employing a task-specific thiol-capped imidazolium ionic liquid (SH-UMIM) is developed that allows study of luminescent CdTe QDs of different sizes in a large number of ILs. Luminescence studies based on ensemble and single-particle blinking measurements have been performed to investigate the role of the capping agent and the media (ILs) on the stability and luminescence properties of the QDs in these media. The results suggest that improved luminescence properties of the CdTe QDs in ILs is due to the capping agent, SH-UMIM, and the enhanced stability of the QDs toward molecular oxygen is provided by the ILs because of low solubility of oxygen in these viscous media.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp308011x