TY - DATA T1 - Taking Advantage of Disorder: Small-Molecule Organic Glasses for Radiation Detection and Particle Discrimination PY - 2017/06/20 AU - Joseph S. Carlson AU - Peter Marleau AU - Ryan A. Zarkesh AU - Patrick L. Feng UR - https://acs.figshare.com/articles/journal_contribution/Taking_Advantage_of_Disorder_Small-Molecule_Organic_Glasses_for_Radiation_Detection_and_Particle_Discrimination/5167807 DO - 10.1021/jacs.7b03989.s001 L4 - https://ndownloader.figshare.com/files/8806063 KW - glass-forming compounds KW - iridium organometallic compounds KW - Small-Molecule Organic Glasses KW - Secondary dopants KW - stilbene crystals KW - wt KW - singlet fluorophores KW - solution-grown trans KW - Optimized singlet KW - bulk melt-casting procedure KW - photophysical properties KW - co-melt mixtures KW - silyl-fluorene molecules KW - radiation detection properties KW - Particle Discrimination KW - detection efficiency KW - glass blends KW - fluorescence quantum yields KW - glass monoliths KW - neutron KW - triplet doping levels KW - highest-performing benchmark materials KW - gamma-ray radiation KW - Radiation Detection N2 - 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. 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. ER -