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Title: Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination

A series of fluorescent silyl-fluorene molecules were synthesized and studied with respect to their photophysical properties and response toward ionizing neutron and gamma-ray radiation. Optically transparent and stable organic glasses were prepared from these materials using a bulk melt-casting procedure. The prepared organic glass monoliths provided fluorescence quantum yields and radiation detection properties exceeding the highest-performing benchmark materials such as solution-grown trans-stilbene crystals. Co-melts based on blends of two different glass-forming compounds were prepared with the goal of enhancing the stability of the amorphous state. Accelerated aging experiments on co-melt mixtures ranging from 0% to 100% of each component indicated improved resistance to recrystallization in the glass blends, able to remain fully amorphous for >1 month at 60 °C. Secondary dopants comprising singlet fluorophores or iridium organometallic compounds provided further improved detection efficiency, as evaluated by light yield and neutron/gamma particle discrimination measurements. As a result, optimized singlet and triplet doping levels were determined to be 0.05 wt % 1,4-bis(2-methylstyryl)benzene singlet fluorophore and 0.28 wt % Ir 3+, respectively.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
SAND-2017-4608J
Journal ID: ISSN 0002-7863; 652949; TRN: US1702365
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 28; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
OSTI Identifier:
1389597

Carlson, Joseph S., Marleau, Peter, Zarkesh, Ryan A., and Feng, Patrick L.. Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination. United States: N. p., Web. doi:10.1021/jacs.7b03989.
Carlson, Joseph S., Marleau, Peter, Zarkesh, Ryan A., & Feng, Patrick L.. Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination. United States. doi:10.1021/jacs.7b03989.
Carlson, Joseph S., Marleau, Peter, Zarkesh, Ryan A., and Feng, Patrick L.. 2017. "Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination". United States. doi:10.1021/jacs.7b03989. https://www.osti.gov/servlets/purl/1389597.
@article{osti_1389597,
title = {Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination},
author = {Carlson, Joseph S. and Marleau, Peter and Zarkesh, Ryan A. and Feng, Patrick L.},
abstractNote = {A series of fluorescent silyl-fluorene molecules were synthesized and studied with respect to their photophysical properties and response toward ionizing neutron and gamma-ray radiation. Optically transparent and stable organic glasses were prepared from these materials using a bulk melt-casting procedure. The prepared organic glass monoliths provided fluorescence quantum yields and radiation detection properties exceeding the highest-performing benchmark materials such as solution-grown trans-stilbene crystals. Co-melts based on blends of two different glass-forming compounds were prepared with the goal of enhancing the stability of the amorphous state. Accelerated aging experiments on co-melt mixtures ranging from 0% to 100% of each component indicated improved resistance to recrystallization in the glass blends, able to remain fully amorphous for >1 month at 60 °C. Secondary dopants comprising singlet fluorophores or iridium organometallic compounds provided further improved detection efficiency, as evaluated by light yield and neutron/gamma particle discrimination measurements. As a result, optimized singlet and triplet doping levels were determined to be 0.05 wt % 1,4-bis(2-methylstyryl)benzene singlet fluorophore and 0.28 wt % Ir3+, respectively.},
doi = {10.1021/jacs.7b03989},
journal = {Journal of the American Chemical Society},
number = 28,
volume = 139,
place = {United States},
year = {2017},
month = {6}
}