NDLI: Quantum dot — Organic polymer composite materials for X-ray detection and imaging

Content Provider	IEEE Xplore Digital Library
Author	Lawrence, W.G. Thacker, S. Palamakumbura, S. Riley, K.J. Nagarkar, V.V.
Copyright Year	2010
Description	Author affiliation: Department of Energy under Grant No.'s DE-SC0000956 and DE-SC0000929 (Lawrence, W.G.; Thacker, S.; Palamakumbura, S.; Riley, K.J.; Nagarkar, V.V.)
Abstract	Colloidal semiconductor nanocrystals exhibit physical properties that are characteristic of intermediate size scales between molecular states and solid state materials, and are often called quantum dots. Solid state semiconductor materials have been used extensively as scintillation detectors for ionizing radiation. We describe the use of semiconductor quantum dot — organic polymer composites for use as scintillation detectors and report the first use of quantum dot — polymer composite thin films for X-ray imaging. We have prepared quantum dot — polymer thin film samples using both aqueous CdTe quantum dots in polyvinyl alcohol and non-aqueous CdSe quantum dots in polystyrene. Optical absorption spectra and emission spectra are used to characterize the quantum dot morphology in the polymer film and to evaluate the impact of the host polymer matrix on the quantum dot dopant. We report the fluorescence lifetime changes of the quantum dots in the polymer host and discuss the impact on high frame rate X-ray imaging. The emission spectrum of the X-ray induced luminescence is found to have the same spectral dependence as the laser induced fluorescence. The details of the quantum dot — polymer composite scintillator fabrication and characterization will be discussed. The thin film substrates are coupled to a CCD camera and used to record X-ray images.
Starting Page	246
Ending Page	252
File Size	460820
Page Count	7
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5873757
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantum dots Polymers X-ray imaging Fluorescence Films Detectors Charge carrier processes
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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