Scintillation properties of semiconducting 6LiInSe2 crystals to ionizing radiation

Wiggins, Brenden; Groza, Michael; Tupitsyn, E.; Lukosi, Eric; Stassun, Keivan G.; Bürger, A.; Stowe, Ashley C.

doi:10.1016/j.nima.2015.08.035

Cited by 25 publications

(26 citation statements)

References 25 publications

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“…The sensor material was grown as a single crystal boule, via the vertical Bridgman process, by the collaborators at Fisk University and Y-12 [22]. After dicing the boule, neutron sensitive regions of semiconductor grade crystal were selected to become LISe sensors [13].…”

Section: Sensor Fabricationmentioning

confidence: 99%

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

et al. 2017

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Abstract:The material lithium indium diselenide, a single crystal neutron sensitive semiconductor, has demonstrated its capabilities as a high resolution imaging device. The sensor was prepared with a 55 µm pitch array of gold contacts, designed to couple with the Timepix imaging ASIC. The resulting device was tested at the High Flux Isotope Reactor, demonstrating a response to cold neutrons when enriched in 95% 6 Li. The imaging system performed a series of experiments resulting in a <200 µm resolution limit with the Paul Scherrer Institute (PSI) Siemens star mask and a feature resolution of 34 µm with a knife-edge test. Furthermore, the system was able to resolve the University of Tennessee logo inscribed into a 3D printed 1 cm 3 plastic block. This technology marks the application of high resolution neutron imaging using a direct readout semiconductor.

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Section: Sensor Fabricationmentioning

confidence: 99%

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

et al. 2017

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“…Available scintillators emit in the blue or ultraviolet parts of the spectrum and therefore do not pair as well with silicon-based photo-detectors as 6 LiInSe 2 does [12,17,18]. This is shown in Figure 5, where the quantum efficiency of the Hamamatsu S8664, given by the manufacturer, and the emission spectrum of a 6 LiInSe 2 crystal, collected using X-ray excited optical luminescence, are shown.…”

Section: Silicon Avalanche Photodiode (Si-apd)mentioning

confidence: 99%

“…It can be seen that the 6 LiInSe 2 crystal has its peak emission at about 510 nm, and that the Si-APD has a high efficiency in this range. [12,9]. Once the instrument was built, it was tested under gamma radiation.…”

Section: Silicon Avalanche Photodiode (Si-apd)mentioning

confidence: 99%

Integration of a ⁶LilnSe₂ thermal neutron detector into a CubeSat instrument

Egner

Groza

Bürger

et al. 2016

J. Astron. Telesc. Instrum. Syst

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Abstract. We present a preliminary design for a neutron detection system that is compact, lightweight, and low power consuming, utilizing the CubeSat platform making it suitable for space-based applications. This is made possible using the scintillating crystal lithium indium diselenide ( 6 LiInSe 2 ), the first crystal to include 6 Li in the crystalline structure, and a silicon avalanche photodiode. The schematics of this instrument are presented as well as the response of the instrument to initial testing under alpha radiation. A principal aim of this work is to demonstrate the feasibility of such a neutron detection system within a CubeSat platform. The entire end-to-end system presented here is 10 × 10 × 15 cm 3 , weighs 670 g, and requires 5 V direct current at 3 W.

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“…LiInSe 2 (x ¼ 0) case [10,16]. Because luminescence can be expected from these tetrahedral complexes, these bond lengths have a direct influence on charge carrier transition frequency; through changes in the local electric field by gallium incorporation, one can tune emission and shorten decay lifetimes.…”

Section: Phys Status Solidi B (2016)mentioning

confidence: 99%

Density functional theory investigation of the LiIn_1-x Ga_x Se₂ solid solution

Wiggins

Batista

Bürger

et al. 2016

Phys. Status Solidi B

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Phone: þ01 865 241 0675, Fax: þ01 865 576 4324The electronic structure and optical properties of the LiIn 1-x Ga x Se 2 (x ¼ 0, 0.25, 0.5, 0.75, 1) solid solution were studied by density functional theory (DFT) with pure functionals. The exchange-correlation is treated within the local density approximation (LDA) and generalized-gradient approximation (GGA). The electronic structures for each respective compound are discussed in detail. Calculations reveal that gallium incorporation can be used to tune the optical-electrical properties of the solid solution and correlates with the lattice parameter. The band gap trend of the LiIn 1-x Ga x Se 2 system follows a nonlinear behavior between the LiInSe 2 and LiGaSe 2 ternary boundaries. The bowing parameter is estimated to be on the order of 0.1-0.3 eV at the G-point. Low-temperature optical absorption revealed a 30% change in the temperature dependence of the band gap for the intermediate compound LiIn 0.6 Ga 0.4 Se 2 compared to ternary boundaries and suggests the heat capacity to be another control element through strain.

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Scintillation properties of semiconducting 6LiInSe2 crystals to ionizing radiation

Cited by 25 publications

References 25 publications

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

Integration of a ⁶LilnSe₂ thermal neutron detector into a CubeSat instrument

Density functional theory investigation of the LiIn_1-x Ga_x Se₂ solid solution

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Scintillation properties of semiconducting 6LiInSe2 crystals to ionizing radiation

Cited by 25 publications

References 25 publications

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

Neutron Imaging with Timepix Coupled Lithium Indium Diselenide

Integration of a 6LilnSe2 thermal neutron detector into a CubeSat instrument

Density functional theory investigation of the LiIn1-x Ga x Se2 solid solution

Contact Info

Product

Resources

About

Integration of a ⁶LilnSe₂ thermal neutron detector into a CubeSat instrument

Density functional theory investigation of the LiIn_1-x Ga_x Se₂ solid solution