The effects of organic moieties on the luminescence properties organic–inorganic layered perovskite-type compounds were investigated. Three single crystals fabricated, namely, (C4H9NH3)2PbBr4 {C4}, (C6H5CH2NH3)2PbBr4 {Ben}, and (C6H5C2H4NH3)2PbBr4 {Phe}. Among crystals, exciton emission Phe showed highest quantum efficiencies. efficiencies C4 Ben only 0.02 0.17 times that Phe, respectively. radiative nonradiative decay rates calculated from lifetimes. relative values in accordance with...

We investigated scintillation properties of organic-inorganic layered perovskite-type compounds under gamma-ray and X-ray irradiation. A crystal the hybrid with phenethyl amine (17 × 23 4 mm) was successfully fabricated by poor-solvent diffusion method. The bulk sample showed superior notably high light yield (14,000 photons per MeV) gamma-rays very fast decay time (11 ns). about 1.4 higher than that common inorganic material (GSO:Ce) confirmed 137Cs 57Co gamma-rays. In fact, highest among...

Abstract The photoluminescence and scintillation properties of Cs 2 HfCl 6 ZrCl crystals were investigated. Two emission bands in the spectra observed at 375 435 nm for crystal 440 479 crystal. Similar radioluminescence. decay time constants found to be about 2.2 8.4 µs 1.5 7.5 . light yields estimated 27,500 25,100 photons/MeV , respectively.

Abstract Recent development of organic scintillators is reviewed from the viewpoint materials science. Design and crystal growth crystalline scintillators, use novel solvents solutes in liquid plastic based on polymer hosts or fluorescent molecules are introduced. Additionally, loaded basis two approaches loading: nanoparticles. A disadvantage has been their low scintillation light yields. Hence, design for improving yields introduced detail with description related excited state dynamics....

We have developed a fast x-ray detector using an organic-inorganic perovskite scintillator of phenethylamine lead bromide (PhE-PbBr4). The had dominant light emission with decay time 9.9 ns. An equipped 0.9-mm-thick PhE-PbBr4 crystal was used to detect nuclear resonant scattering in N61i (the first excited level: 67.41 keV; lifetime: 7.6 ns) by synchrotron radiation. With this detector, we could successfully record the decaying gamma rays emitted from resolution 0.7 ns (full width at half...

Abstract We report the luminescence and scintillation properties of a newly developed thallium magnesium chloride (TlMgCl 3 ) crystal. The crystal sample can be easily fabricated from melt using Bridgman method. photoluminescence band appeared near wavelength 405 nm under excitation at 230 nm. An X-ray-induced spectrum showed an intense emission decay time constant was estimated to approximately 60 ns (∼25%) 350 (∼75%) bi-exponential fitting. light yield reached 46,000 photons/MeV with...

The concept of a "quantum scintillator", satisfying both large light output and quick response, is proposed. temporal behavior scintillation from (n-C6H13NH3)2PbI4, natural multiple quantum well structure provided by the lead-halide-based perovskite-type organic-inorganic hybrid compound, was investigated using short-pulsed electron beam streak camera. A decay component 390 ps efficiently observed even at room temperature. This response notably quicker than conventional Ce3+-activated...

The authors have demonstrated scintillation of rare earth (RE)-free Sn-doped oxide glass by excitation ionizing radiation. It is notable that light emission attained for RE-free transparent due to s2-sp transition Sn2+ centre and the correlates with band at 20 eV. We also can be tuned chemical composition host glass. present result valuable not only design inorganic amorphous scintillator but revealing structure irradiation

The X-ray detection capability of a scintillation detector equipped with Cs2ZnCl4 single crystal was evaluated. decay kinetics can be expressed as the sum two exponential components. fast component had time constant 1.8 ns, and its relative intensity 95%. total light output 630 photons/MeV, subnanosecond timing resolution 0.66 ns obtained. efficiency 67.4 keV X-rays 80% for 2.2-mm-thick crystal. Thus, excellent high were achieved simultaneously.

Abstract The effects of organic moieties on the scintillation properties organic–inorganic layered perovskite-type compounds have been investigated. Three kinds single crystals were fabricated, namely, (C 4 H 9 NH 3 ) 2 PbBr (C4), 6 5 CH (Ben), and C (Phe). Among crystals, light output Phe was found to greatest value when exposed X-ray radiation (67.4 keV). 0.62 times that YAP:Ce. relative values outputs among fabricated under correlated well with those quantum efficiencies luminescence...

Development of organic–inorganic nanocomposite scintillators as a new class is reviewed. Advantages and shortcomings polymer-based organic scintillators, i.e. plastic are described among the desired properties scintillators. by addition organometallic compounds in an approach to overcome introduced. In comparison this approach, comprising added with inorganic nanoparticles The synthesis methods achieved their applications Finally, possible strategies for further improvement presented.

Abstract We report on the structural, photoluminescence (PL), and scintillation properties of Ce-doped P 2 O 5 –Al 3 –Cs O–BaO glass scintillators having different Ce concentrations (1.96, 3.85, 7.41, 10.7, 13.8 mol%) for gamma- X-ray detection. The highest density (3.57 g/cm ) was achieved with concentration mol%. PL emission X-ray-induced radioluminescence spectra showed peaks corresponding to allowed transition from 3+ 5d excited state 4f ground states. light yields (approximately 2200...

Photoluminescence (PL) and scintillation properties of undoped Ti-doped LiGaO2 single crystals were investigated. In both PL scintillation, the showed luminescence due to charge transfer between Ti4+–O2- while crystal oxygen vacancies. Under thermal neutron irradiation, all exhibited a clear peak, highest light yield was observed from 3% crystal. The ten times higher than that comparable with commercial scintillator GS20. addition, high α/γ ratios up about 0.7.

Thermally activated delayed fluorescence (TADF) materials possess exceptional photophysical properties. Organic scintillators utilizing TADF have shown great promise for applications requiring efficient radio-luminescence, owing to their high quantum efficiency and tunable emission Previous studies demonstrated that polymer dots (P-dots) doped with exhibit radio-luminescence under hard X-ray electron beam excitation. However, the used in these experiments were limited color options,...

A single crystal of YAl3(BO3)4 was grown using the top-seeded solution growth method. The vacuum ultraviolet (VUV) excitation spectrum, monitored at emission wavelength 312 and 372 nm, showed a narrow band around 162 which is located near absorption edge host. Upon VUV characteristic self-trapped exciton (STE) bands were observed nm. X-ray excited scintillation spectrum shows broad peaking 310 nm with weak shoulder 375 consistent photoluminescence, can thus be assigned to STE emission. light...

Crystals of the title compound, {(C(6)H(5)C(2)H(4)NH(3))(2)[PbBr(4)]}(n), were grown at room temperature from a solution in N,N-dimethyl-formamide (DMF) using nitro-methane as poor solvent. This perovskite-type organic-inorganic hybrid compound consists well ordered sheets corner-sharing disordered PbBr(6) octa-hedra separated by bilayers phenethyl-ammonium cations. The are rotated and tilted due to N-H⋯Br hydrogen bonds with ammonium groups, generating superstructure unit cell similar that...

We investigated the optical properties of organic–inorganic layered perovskite-type compounds that contained naphthylmethyl moieties in organic layer. The Wannier exciton energy inorganic layer can be modulated by varying halogen content. or Frenkel emissions were observed where was lower higher than triplet moiety, respectively. For with near-resonant and energies, luminescence only at 490 500 nm from moiety while 520–566 not detected. This selective quenching attributed to an enhancement...

With the aim of enhancing efficiency with which plastic scintillators detect high-energy X-rays, hafnium-doped organic-inorganic hybrid were fabricated via a sol-gel method. Transmission electron microscopy sampled material reveals presence HfxSi1−xO2 nanoparticles, dispersed in polymer matrix that constitutes active X-ray detector. nanoparticles incorporated matrix, absorption edge and luminescence wavelength is shifted, we attribute to Mie scattering. The detection for 67.4-keV X-rays...