54 research outputs found
The incorporation of CsCu2I3 nanocrystals into polydimethylsiloxane matrix for X- and γ-ray scintillators
No full textRaw data was presented in the following manuscript: T. Haposan, M. Makowski, D. Kowal, L.J. Diguna, M.E. Witkowski, S. Mahato, W. Drozdowski, A. Arramel, M.D. Birowosuto, The Incorporation of CsCu2I3 Nanocrystals into Polydimethylsiloxane Matrix for X- and γ-Ray Scintillators, Phys. Status Solidi RRL 19, (2025) 24010298. https://doi.org/10.1002/pssr.202400298.The attached ZIP contains data of radioluminescence (RL) as a function of temperature, pulse height spectra (PHS) and scintillation time profile (STP) of CsCu2I3 nanocrystals embedded in polydimethylsiloxane matrix.</p
Solution-Processable A2XY4 (A=PEA, BA; X= Pb, Sn, Cu, Mn; Y=Cl, Br, I) Crystals for High Light Yield and Ultrafast Scintillators
No full textTwo-dimensional (2-D) Ruddlesden-Popper (RP) hybrid organic-inorganic perovskite (HOIP) crystals, A2XY4 [A = Phenethylammonium (PEA), Butylammonium (BA);
X = Pb, Sn, Cu, Mn; Y = Cl, Br, I] have been a subject of interest for solution-processable scintillators for the past two decades, due to the possibility to grow high-quality and large crystals with low-cost techniques. We start the review from PEA2PbBr4 and BA2PbBr4 crystals, which have light yields >10 photons/keV and scintillation decay times <15 ns. Then, we extend our review to iodide compounds from the perspective that the smaller bandgaps and the heavier anions can allow higher light yields and shorter absorption lengths, respectively. In our previous experiments, we observed that the iodide crystals are bright while they have 1 ns optical decay times. Another approach is
the investigations of the ion-doped PEA2PbBr4 and BA2PbBr4, in which Li-doped PEA2PbBr4 has 23 photons/keV light yields.
An additional feature is the thermal neutron detection and the discrimination with gamma-ray. Finally, we investigate lead-free perovskite variants (Sn, Cu, and Mn) as they are more friendly to environments, and the emission is shifted from blue to green or red for better sensitivity with current X-ray imaging detectors. Unfortunately, the light yields are much lower than the Pb counterparts, while the decay times are considerably slower due to different exciton mechanisms. This comprehensive investigation helps us to direct our review to the identification of the ultimate 2-D RP HOIP scintillators with high light yield, ultrafast response, and environmental friendliness
X-ray scintillation in lead halide perovskite crystals
No full textCurrent technologies for X-ray detection rely on scintillation from expensive inorganic crystals grown at high-temperature, which so far has hindered the development of large-area scintillator arrays. Thanks to the presence of heavy atoms, solution-grown hybrid lead halide perovskite single crystals exhibit short X-ray absorption length and excellent detection efficiency. Here we compare X-ray scintillator characteristics of three-dimensional (3D) MAPbI 3 and MAPbBr 3 and two-dimensional (2D) (EDBE)PbCl 4 hybrid perovskite crystals. X-ray excited thermoluminescence measurements indicate the absence of deep traps and a very small density of shallow trap states, which lessens after-glow effects. All perovskite single crystals exhibit high X-ray excited luminescence yields of >120,000 photons/MeV at low temperature. Although thermal quenching is significant at room temperature, the large exciton binding energy of 2D (EDBE)PbCl 4 significantly reduces thermal effects compared to 3D perovskites, and moderate light yield of 9,000 photons/MeV can be achieved even at room temperature. This highlights the potential of 2D metal halide perovskites for large-area and low-cost scintillator devices for medical, security and scientific applications
Effect of dual-organic cations on the structure and properties of 2D hybrid perovskites as scintillators
No full textRaw data presented in the following manuscript: M.A. K. Sheikh, F. Maddalena, D. Kowal, M. Makowski, S. Mahato, R. Jedrzejewski, R. Bhattarai, M.E. Witkowski, K.J. Drozdowski, W. Drozdowski, C. Dang, T.D. Rhone, M.D. Birowosuto, Effect of Dual-Organic Cations on the Structure and Properties of 2D Hybrid Perovskites as Scintillators, ACS Applied Materials Interfaces 16, (2024) 25529-25539. https://doi.org/10.1021/acsami.4c01741Attached files consist of absorption spectra, photoluminescence (PL), time-resolved PL (TRPL), X-ray luminescence (RL) as a function of temeprature, low temperature thermoluminescence (ltTL) measurement data.</p
Organometallic Perovskite Metasurfaces
No full textResearchers show that solution-processed organometallic halide perovskites provide a high index, low-loss platform for realizing metasurfaces with high Q-factor resonances at visible frequencies in the search for alternative dielectric photonic materials. Organolead halide perovskites are emerging solution-processable materials with outstanding optoelectronic properties. Among them, methylammonium lead iodide perovskite, CH3NH3PbI3, has proven to be an exceptional light harvester for hybrid organic–inorganic solar cells, which has achieved an impressive NREL certified power conversion efficiency over 20%, and remarkable performance in a variety of device architectures
PEA2PbI4: fast two-dimensional lead iodide perovskite scintillator with green and red emission
No full textAmong the two-dimensional hybrid organic-inorganic perovskites, PEA2PbBr4 is one of the best scintillators combining high light yield and fast nanosecond decay time. However, it has limited sensitivity to X-ray and positron emission tomography because of insufficient mass density and effective atomic number. In this article, we show that exchanging the halide from bromide to iodide allows to shorten the absorption length as much as two times for X-ray energies. We present a detailed study on scintillation properties of self-grown samples of PEA2PbI4 crystal, which we compare with the previously reported results for PEA2PbBr4 crystal. The synthesis method of PEA2PbI4 crystal is based on dissolving the perovskite precursors in hydroiodic acid, which is then stirred and left for evaporation. Our measurements include the characterizations with optical, X-ray, and γ-ray sources. We observe two emission bands of PEA2PbI4 crystal centered at 532 (green) and 660 (red) nm, and we link them to the scintillation mechanisms involving exciton and surface defect states. We also report the scintillation light yields of 1,000 and 10,000 photons/MeV at room temperature and 10 K, respectively, and the coincidence timing resolution full width at half maximum of 138 ps, and the fast component in scintillation decay curve of 0.5 ns. This fast component is much faster than that of 13.4 ns of PEA2PbBr4 crystal, and with two times shorter absorption length, it secures better opportunities in timing applications in particular time-of-flight positron emission tomography and high energy physics
A2Bn-1PbnI3n+1 (A = BA, PEA; B = MA; n = 1, 2): Engineering Quantum-Well Crystals for High Mass Density and Fast Scintillators
No full textQuantum-well (QW) hybrid organic-inorganic perovskite (HOIP) crystals, e.g., A2PbX4 (A = BA, PEA; X = Br, I), demonstrated significant potentials as scintillating materials for wide energy radiation detection compared to their individual three-dimensional (3D) counterparts, e.g., BPbX3 (B = MA). Inserting 3D into QW structures resulted in new structures, namely A2BPb2X7 perovskite crystals, and they may have promising optical and scintillation properties toward higher mass density and fast timing scintillators. In this article, we investigate the crystal structure as well as optical and scintillation properties of iodide-based QW HOIP crystals, A2PbI4 and A2MAPb2I7. A2PbI4 crystals exhibit green and red emission with the fastest PL decay time <1 ns, while A2MAPb2I7 crystals exhibit a high mass density of >3.0 g/cm3 and tunable smaller bandgaps <2.1 eV resulting from quantum and dielectric confinement. We observe that A2PbI4 and PEA2MAPb2I7 show emission under X- and γ-ray excitations. We further observe that some QW HOIP iodide scintillators exhibit shorter radiation absorption lengths (∼3 cm at 511 keV) and faster scintillation decay time components (∼0.5 ns) compared to those of QW HOIP bromide scintillators. Finally, we investigate the light yields of iodide-based QW HOIP crystals at 10 K (∼10 photons/keV), while at room temperature they still show pulse height spectra with light yields between 1 and 2 photons/keV, which is still >5 times lower than those for bromides. The lower light yields can be the drawbacks of iodide-based QW HOIP scintillators, but the promising high mass density and decay time results of our study can provide the right pathway for further improvements toward fast-timing applications
Small polarons in 2D perovskites
No full textWe demonstrate that white light luminescence in two-dimensional (2D) perovskites stems from photoinduced formation of small polarons confined at specific sites of the inorganic framework in the form of self-trapped electrons and holes. We discuss their application in white light emitting devices and X-ray scintillators
Optimizing doping thresholds for enhanced scintillation in 2D hybrid organic–inorganic perovskites
No full textRaw data presented in the manuscript: F. Maddalena, M. Makowski, C. Xiao, M.A.K. Sheikh, D. Kowal, M.E. Witkowski, K.J. Drozdowski, S. Mahato, C. Dujardin, R. Cala, E. Auffray, M.H. Mahyuddin, W. Drozdowski, M.D. Birowosuto, and C. Dang. Optimizing doping thresholds for enhanced scintillation in 2D hybrid organic–inorganic perovskites. FlatChem 47, (2024), 100701. https://doi.org/10.1016/j.flatc.2024.100701.Data consists of absorption spectra (ABS), photoluminescence (PL), time-resolved PL (TRPL), radioluminescence (RL), thermoluminescence (TL), time-resolved RL (TRRL), pulse height spectra (PHS), scintillation time profiles (STP) and Raman spectra of Ba1-xtBuxPbBr4 where X = 0, 0.1, 0.2 and 0.4.All files attached in ZIP format are split to contain full characterization data for 1 sample, the name of the ZIP corresponds with the sample compisiont.</p
Nanopatterning-enhanced perovskite luminophores
No full textWe demonstrate that nanopatterning of solution-processable metal-halide perovskite films can be used to control their luminescence spectra and lead to up to five-fold increase of luminescence yield
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