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Scintillating Metal Organic Frameworks: A New Class of Radiation Detection Materials

Published online by Cambridge University Press:  31 January 2011

Mark Allendorf ,
Ronald Houk ,
Raghu Bhakta ,
Ida Beck Nielsen  and
Patrick Doty
Mark Allendorf
Affiliation:
mdallen@sandia.gov, Sandia National Laboratories, Mail Stop 9291, Livermore, California, 94551-0969, United States
Ronald Houk
Affiliation:
rhouk@sandia.gov, Sandia National Laboratories, Livermore, California, United States
Raghu Bhakta
Affiliation:
rkbhakt@sandia.gov, Sandia National Laboratories, Livermore, California, United States
Ida Beck Nielsen
Affiliation:
ibniels@sandia.gov, Sandia National Laboratories, Livermore, California, United States
Patrick Doty
Affiliation:
fpdoty@sandia.gov, Sandia National Laboratories, Livermore, California, United States
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Abstract

The detection and identification of subatomic particles is an important scientific problem with implications for medical devices, radiography, biochemical analysis, particle physics, and astrophysics. In addition, the development of efficient detectors of neutrons generated by fissile material is a pressing need for nuclear nonproliferation and counterterrorism efforts. A critical objective in the field of radiation detection is to develop the physical insight necessary to rationally design new scintillation materials for specific applications. However, none of the material types currently used in has sufficient synthetic versatility to exert systematic control over the factors controlling the light output and its dynamics. Here we describe a spectroscopic investigation of two stilbene-based metal-organic frameworks (MOFs) we synthesized, demonstrating that they emit light in response to ionizing radiation, creating the first completely new class of scintillation materials since the advent of plastic scintillators in 1950. This highly novel and unexpected property of MOFs opens a new route to rational design of radiation detection materials, since the spectroscopy shows that both the luminescence spectrum and its timing can be varied by altering the local environment of the chromophore within the MOF. Therefore, the inherent synthetic flexibility of MOFs, which enables both the chromophore structure and its local environment to be systematically varied, suggests that this class of materials can serve as a controlled “nanolaboratory” for probing a broad range of photophysical and radiation detection phenomena. In this presentation we report on the time-dependent fluorescence and radioluminescence of these MOFs and related structures. Multiple decay characteristics have been observed for some materials under study, including fast (ns) exponential and slow (microsecond) non-exponential components. We interpret the results in terms of the electronic states, crystal structures, intermolecular interactions, and transport effects mediating the luminescence. The potential for particle discrimination schemes and large scale production of MOFs and will be discussed.

Keywords

nanoscaleradiation effectsporosity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1164: Symposium L – Nuclear Radiation Detection Materials–2009 , 2009 , 1164-L07-01
Copyright
Copyright © Materials Research Society 2009

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