Spectroscopy of composite scintillators

Шмурак, С. З.; Кедров, В. В.; Классен, Н. В.; Shakhrai, O. A.

doi:10.1134/s1063783412110297

Cited by 16 publications

(6 citation statements)

References 12 publications

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“…Electronic absorption spectra of 5 in CH 2 Cl 2 at 298 K. (A) [ 5 ] = 2.16 × 10 –4 M, path length = 1 mm; (B) [ 5 ] = 1.26 × 10 –4 M, path length = 1 mm; (C) [ 5 ] = 1.54 × 10 –5 M, path length = 6.22 mm …”

Section: Resultsmentioning

confidence: 99%

“…The base usually contains an aromatic group attached to a polymer backbone, such as polystyrene, while the dissolved fluor is an organic or inorganic emitter . Organic fluorophores trap singlet excitons but can have increased efficiency through triplet–triplet annihilation, − whereas heavy-metal emitters can trap both singlet and triplet excitons and increase the efficiency of plastic scintillators by as much as 3-fold. ,, A high-Z component metal is also desirable to enhance the cross-section for interaction with γ-rays in radiation sensors. ,, This study focuses on bismuth metal chelates that offer the potential for a high-Z emitting component in plastic scintillators. Bismuth is a low cost element and is the highest Z nonradioactive metal.…”

Section: Introductionmentioning

confidence: 99%

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Luminescent Tris(8-hydroxyquinolates) of Bismuth(III)

2013

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Luminescent homoleptic bismuth(III) complexes have been synthesized by adding several functionalized 8-hydroxyquinolate ligands to bismuth(III) chloride in a 3:1 mole ratio in either ethanol or tetrahydrofuran (THF) solvent. These complexes have been characterized by single-crystal X-ray diffraction (XRD) analysis, UV–vis spectroscopy, fluorescence spectroscopy, and density functional theory (DFT) calculations to determine their structures and photophysical properties. Reversible dimerization of the mononuclear tris(hydroxyquinolate) complexes was observed in solution and quantified using UV–vis spectroscopy. The fluorescence spectra show a blue shift for the monomer compared with homoleptic aluminum(III) hydroxyquinolate compounds. Four dimeric compounds and one monomeric isomer were characterized structurally. The bismuth(III) centers in the dimers are bridged by two oxygen atoms from the substituted hydroxyquinolate ligands. The more sterically hindered quinolate complex, tris(2-(diethoxymethyl)-8-quinolinato)bismuth, crystallizes as a monomer. The complexes all exhibit low-lying absorption and emission spectral features attributable to transitions between the HOMO (π orbital localized on the quinolate phenoxide ring) and LUMO (π* orbital localized on the quinolate pyridyl ring). Excitation and emission spectra show a concentration dependence in solution that suggests that a monomer–dimer equilibrium occurs. Electronic structure DFT calculations support trends seen in the experimental results with a HOMO–LUMO gap of 2.156 eV calculated for the monomer that is significantly larger than those for the dimers (1.772 and 1.915 eV). The close face to face approach of two quinolate rings in the dimer destabilizes the uppermost occupied quinolate π orbitals, which reduces the HOMO–LUMO gap and results in longer wavelength absorption and emission spectral features than in the monomer form.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Luminescent Tris(8-hydroxyquinolates) of Bismuth(III)

2013

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“…The spectral and temporal characteristics of X‐ray luminescence of composites consisting of microparticles (1–20 μm) of “heavy” components (oxides, fluorides and sulfates of Zn, Cd, Cs, Ba, La, Lu, Hf, Pb, Bi) and an organic polymer binder (typically PSt/PPO/POPOP) impurities have been investigated 66. Among the composites studied, the highest light yield was achieved for the system consisting of LaF 3 with PSt activated with PPO+POPOP.…”

Section: Modifications Of Polymeric Matrix For Special Applicationsmentioning

confidence: 99%

Current Status on Plastic Scintillators Modifications

Bertrand

Hamel

Sguerra

2014

Chemistry A European J

118

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Recent developments of plastic scintillators are reviewed, from 2000 to March 2014, distributed in two different chapters. First chapter deals with the chemical modifications of the polymer backbone, whereas modifications of the fluorescent probe are presented in the second chapter. All examples are provided with the scope of detection of various radiation particles. The main characteristics of these newly created scintillators and their detection properties are given.

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“…For example, aligned metal nanowires in a polymer matrix could be used to modify the optical properties of the composite, generating a dichroic material [10]. When functional micro-or nanomaterials are assembled without dispersing hosts, optical grade polycrystalline ceramics and composites for scintillation detection may be obtained, e.g., by using radioluminescent microparticles as building blocks [2,3,11,12]. In this scenario, doped rare earth sesquioxides (RE 2 O 3 ) are appealing materials for phosphor or scintillation applications where light transmission is required, due to their wide band gap.…”

Section: Introductionmentioning

confidence: 99%

Heat-Induced Transformation of Luminescent, Size Tuneable, Anisotropic Eu:Lu(OH)2Cl Microparticles to Micro-Structurally Controlled Eu:Lu2O3 Microplatelets

2021

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Synthetic procedures to obtain size and shape-controlled microparticles hold great promise to achieve structural control on the microscale of macroscopic ceramic- or composite-materials. Lutetium oxide is a material relevant for scintillation due to its high density and the possibility to dope with rare earth emitter ions. However, rare earth sesquioxides are challenging to synthesise using bottom-up methods. Therefore, calcination represents an interesting approach to transform lutetium-based particles to corresponding sesquioxides. Here, the controlled solvothermal synthesis of size-tuneable europium doped Lu(OH)2Cl microplatelets and their heat-induced transformation to Eu:Lu2O3 above 800 °C are described. The particles obtained in microwave solvothermal conditions, and their thermal evolution were studied using powder X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical microscopy, thermogravimetric analysis (TGA), luminescence spectroscopy (PL/PLE) and infrared spectroscopy (ATR-IR). The successful transformation of Eu:Lu(OH)2Cl particles into polycrystalline Eu:Lu2O3 microparticles is reported, together with the detailed analysis of their initial and final morphology.

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Spectroscopy of composite scintillators

Cited by 16 publications

References 12 publications

Luminescent Tris(8-hydroxyquinolates) of Bismuth(III)

Luminescent Tris(8-hydroxyquinolates) of Bismuth(III)

Current Status on Plastic Scintillators Modifications

Heat-Induced Transformation of Luminescent, Size Tuneable, Anisotropic Eu:Lu(OH)2Cl Microparticles to Micro-Structurally Controlled Eu:Lu2O3 Microplatelets

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