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Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination
journal contribution
posted on 2017-06-20, 00:00 authored by Joseph
S. Carlson, Peter Marleau, Ryan A. Zarkesh, Patrick L. FengA 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. 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.
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Keywords
glass-forming compoundsiridium organometallic compoundsSmall-Molecule Organic GlassesSecondary dopantsstilbene crystalswtsinglet fluorophoressolution-grown transOptimized singletbulk melt-casting procedurephotophysical propertiesco-melt mixturessilyl-fluorene moleculesradiation detection propertiesParticle Discriminationdetection efficiencyglass blendsfluorescence quantum yieldsglass monolithsneutrontriplet doping levelshighest-performing benchmark materialsgamma-ray radiationRadiation Detection
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