Spectral- and Pulse-Shape Discrimination in Triplet-Harvesting Plastic Scintillators

Feng, Patrick L.; Villone, Janelle; Hattar, Khalid Mikhiel; Mrowka, S.; Wong, Bryan M.; Allendorf, Mark D.; Doty, F. Patrick

doi:10.1109/tns.2012.2213609

Cited by 47 publications

(27 citation statements)

References 20 publications

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“…In scintillators, heavy charged particles created by neutron capture reactions and recoil protons generated by elastic scatterings of neutrons, exhibit much greater ener-gy-loss rates than primary and secondary electrons generated by gamma rays. Therefore, one can observe relatively higher density of triplet states and, thus, an increased fraction of delayed fluorescence from the neutron interaction in organic scintillators [15].…”

Section: Methodsmentioning

confidence: 99%

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

2019

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Background:As neutron fields are always accompanied by gamma rays, it is essential to distinguish neutrons from gamma rays in the detection of neutrons. Neutrons and gamma rays can be separated by pulse shape discrimination (PSD) methods. Recently, we performed characterization of a stilbene scintillator detector and an EJ-301 liquid scintillator detector with a highspeed digitizer DT5730 and investigated optimized PSD variables for both detectors. This study is for providing a basis for developing fast neutron/gamma-ray dual-particle imager. Materials and Methods:We conducted PSD experiments using stilbene scintillator and EJ-301 liquid scintillator and evaluated neutron and gamma ray discriminability of each PSD method with a 137 Cs gamma source and a 252 Cf neutron source. We implemented digital signal processing techniques to apply two PSD methods -the charge comparison (CC) method and the constant time discrimination (CTD) method -to distinguish neutrons from gamma rays. We tried to find optimized PSD variables giving the best discriminability in a given experimental condition. Results and Discussion:For the stilbene scintillator detector, the charge comparison method and the constant time discrimination method both delivered the PSD FOM values of 1.7. For the EJ-301 liquid scintillator detector, both PSD methods delivered the PSD FOM values of 1.79. With the same PSD variables, PSD performance was excellent in 300 ± 100 keVee, 500 ± 100 keVee, and 700 ± 100 keVee energy regions. This result shows that we can achieve an effective discrimination of neutrons from gamma rays using these scintillator detector systems. Conclusion:We applied both PSD methods to a stilbene and a liquid scintillator and optimized the PSD performance represented by FOM values. We observed a good separation performance of both scintillators combined with a high-speed digitizer and digital PSD. These results will provide reference values for the dual-particle imager we are developing, which can image both fast neutrons and gamma rays simultaneously.

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Section: Methodsmentioning

confidence: 99%

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

2019

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“…A related concept is used to increase quantum yields in organic light-emitting diodes. 6,7 Since this initial discovery, we determined that doping certain plastics allows SSD as well, 8 which is important for applications such as wide-area detectors for portal monitoring, for which economical scintillators are needed. As shown in Figure 3, light produced by the triplet harvester acetylacetonatobis(2-phenylpyridine)iridium-abbreviated as Ir(ppy) 2 (acac)at 515nm is well separated from the emission from singlet excitons emitted by the polymer polyvinylcarbazole (PVK) host at 420nm.…”

Section: 1117/21201209004465 Page 2/3mentioning

confidence: 99%

Designer colors for radiation detection

Allendorf¹,

Doty²,

Feng³

2012

SPIE Newsroom

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“…In addition, these compounds show different emission (and absorption) wavelengths, which are controlled by including different ligands in the molecular design 8 . According to this description, these complexes are used in solid state lighting systems such as organic lightemitting diodes (OLEDs) and light emitting electrochemical cells (LECs) [9][10][11][12] ; moreover, the luminescent properties of Ir III complexes turn them in efficient candidates for development of scintillating materials for radiation detection 13,14 . In particular, LECs devices consist of a layer of an ionic transition metal complex (iTMC) with luminescent properties, sandwiched between two electrodes; a cathode consisting in a metal layer and a transparent conductive film (indium-tin oxide for example) that acts as anode.…”

Section: Introductionmentioning

confidence: 99%

About the electronic and photophysical properties of iridium(iii)-pyrazino[2,3-f][1,10]-phenanthroline based complexes for use in electroluminescent devices

Cortés‐Arriagada

Sanhueza

González

et al. 2016

Phys. Chem. Chem. Phys.

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A family of cyclometalated Ir(III) complexes was studied through quantum chemistry calculations to get insights into their applicability in light electrochemical cells (LECs). The complexes are described as [Ir(R-C^N)2(ppl)](+), where ppl is the pyrazino[2,3-f][1,10]-phenanthroline ancillary ligand. The modification of the HOMO energy in all the complexes was achieved by means of different R-C^N cyclometalating ligands, with R-ppy (phenylpyridine), R-pyz (1-phenylpyrazole) or R-pypy (2,3'-bipyridine); in addition, inductive effects were taken into account by substitution with the R groups (R = H, F or CF3). Then, compounds with HOMO-LUMO energy gaps from 2.76 to 3.54 eV were obtained, in addition to emission energies in the range of 438 to 597 nm. The emission deactivation pathways confirm the presence of metal-to-ligand transitions in all the complexes, which allow the strong spin-orbit coupling effects, and then improving the luminescence performance. However, the coupling with ligand and metal centered excited states was observed for the blue-shifted emitters, which could result in a decrease of the luminescence efficiencies. Furthermore, ionization potentials, electron affinities and reorganization energies (for holes and electrons) were obtained to account for the injection and transport properties of all the complexes in electroluminescent devices.

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Spectral- and Pulse-Shape Discrimination in Triplet-Harvesting Plastic Scintillators

Cited by 47 publications

References 20 publications

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

Designer colors for radiation detection

About the electronic and photophysical properties of iridium(iii)-pyrazino[2,3-f][1,10]-phenanthroline based complexes for use in electroluminescent devices

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