Metal Halide Perovskites for X-ray Imaging Scintillators and Detectors

ACS Energy Letters, Год журнала: 2021, Номер 6(2), С. 739 - 768

Опубликована: Янв. 29, 2021

Radiation detection, using materials to convert high-energy photons low-energy (X-ray imaging) or electrical charges detector), has become essential for a wide range of applications including medical diagnostic technologies, computed tomography, quality inspection and security, etc. Metal halide perovskite-based high-resolution scintillation-imaging screens direct conversion detectors are promising candidates such applications, because they have high absorption cross sections X-rays due their heavy atom (e.g., Pb2+, Bi3+, I–) compositions; moreover, these solution-processable at low temperature, possessing tunable bandgaps, near-unity photoluminescence quantum yields, trap density, charge carrier mobility, fast photoresponse. In this review, we explore decipher the working mechanism scintillators as well key advantages perovskites both detection approaches. We further discuss recent advancements in research area, pointing out remaining challenges our perspective future directions toward X-ray applications.

Язык: Английский

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Efficient White Photoluminescence from Self-Trapped Excitons in Sb³⁺/Bi³⁺-Codoped Cs₂NaInCl₆ Double Perovskites with Tunable Dual-Emission

ACS Energy Letters, Год журнала: 2021, Номер 6(9), С. 3343 - 3351

Опубликована: Авг. 30, 2021

Efficient and stable inorganic lead-free halide perovskites have attracted tremendous attention for next-generation solid-state lighting. However, single perovskite phosphors with strong, tunable-color-temperature white-light emission are rare. Here, a doping strategy was developed to incorporate Sb3+ Bi3+ ions into Cs2NaInCl6 crystals. Blue yellow white light 77% quantum yield observed. The dual-emission originates from different [SbCl6]3– octahedron-related self-trapped excitons (STEs). blue is attributable limited Jahn–Teller deformation doping. Large-radii increase the level of octahedron, enhancing STE emission. Density functional theory calculations indicated that forms sub-band level, which produces Tuning between warm cold can be realized by changing Sb3+/Bi3+ ratio, suggests unique interaction mechanism dopants, as well Bi3+-induced lattice distortion in double perovskites.

Язык: Английский

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Compact ultrabroadband light-emitting diodes based on lanthanide-doped lead-free double perovskites

Light Science & Applications, Год журнала: 2022, Номер 11(1)

Опубликована: Март 8, 2022

Impurity doping is an effective approach to tuning the optoelectronic performance of host materials by imparting extrinsic electronic channels. Herein, a family lanthanide (Ln3+) ions was successfully incorporated into Bi:Cs2AgInCl6 lead-free double-perovskite (DP) semiconductor, expanding spectral range from visible (Vis) near-infrared (NIR) and improving photoluminescence quantum yield (PLQY). After multidoping with Nd, Yb, Er Tm, Bi/Ln:Cs2AgInCl6 yielded ultrabroadband continuous emission spectrum full width at half-maximum ~365 nm originating intrinsic self-trapped exciton recombination abundant 4f-4f transitions Ln3+ dopants. Steady-state transient-state spectra were used ascertain energy transfer emissive processes. To avoid adverse interactions between various in single DP host, heterogeneous architecture designed spatially confine different dopants via "DP-in-glass composite" (DiG) structure. This bottom-up strategy endowed prepared Ln3+-doped DIG high PLQY 40% (nearly three times as that multidoped DP) superior long-term stability. Finally, compact Vis-NIR (400~2000 nm) light source easily fabricated coupling DiG commercial UV LED chip, this has promising applications nondestructive spectroscopic analyses multifunctional lighting.

Язык: Английский

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Halide perovskite memristors as flexible and reconfigurable physical unclonable functions

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Июнь 17, 2021

Physical Unclonable Functions (PUFs) address the inherent limitations of conventional hardware security solutions in edge-computing devices. Despite impressive demonstrations with silicon circuits and crossbars oxide memristors, realizing efficient roots trust for resource-constrained remains a significant challenge. Hybrid organic electronic materials rich reservoir exotic switching physics offer an attractive, inexpensive alternative to design cryptographic hardware, but have not been investigated till date. Here, we report breakthrough primitive exploiting one dimensional halide perovskite memristors as excellent sources entropy secure key generation device authentication. Measurements prototypical 1 kb propyl pyridinium lead iodide (PrPyr[PbI3]) weak memristor PUF differential write-back strategy reveals near ideal uniformity, uniqueness reliability without additional area power overheads. Cycle-to-cycle write variability enables reconfigurability, while in-memory computing empowers strong recurrent construction thwart machine learning attacks.

Язык: Английский

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Interplay of defect levels and rare earth emission centers in multimode luminescent phosphors

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Дек. 8, 2022

Multimode luminescence generally involves tunable photon emissions in response to various excitation or stimuli channels, which demonstrates high coding capacity and confidentiality abilities for anti-counterfeiting encryption technologies. Integrating multimode into a single stable material is promising strategy but remains challenge. Here, we realize distinct long persistent luminescence, short-lived down/upconversion NaGdTi2O6:Pr3+, Er3+ phosphor by emloying interplay of defect levels rare earth emission centers. The materials show intense colorful statically dynamically, responds wide spectrum ranging from X-ray sunlight, thermal disturbance, mechanical force, further allowing the colors manipulable space time dimensions. Experimental theoretical approaches reveal that Pr3+ ↔ Pr4+ valence change, oxygen vacancies anti-site TiGd defects this disordered structure contributes luminescence. We present facile nondestructive demo whose color fade intensity can be controlled via external manipulation, indicating promise high-capacity information applications.

Язык: Английский

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Boosting the Self‐Trapped Exciton Emission in Alloyed Cs₂(Ag/Na)InCl₆ Double Perovskite via Cu⁺ Doping

Advanced Science, Год журнала: 2022, Номер 9(7)

Опубликована: Янв. 17, 2022

Fundamental understanding of the effect doping on optical properties 3D double perovskites (DPs) especially dynamics self-trapped excitons (STEs) is vital importance for their optoelectronic applications. Herein, a unique strategy via Cu+ to achieve efficient STE emission in alloyed lead-free Cs2 (Ag/Na)InCl6 DPs reported. A small amount (1.0 mol%) results boosted crystals, with photoluminescence (PL) quantum yield increasing from 19.0% 62.6% and excitation band shifting 310 365 nm. Temperature-dependent PL femtosecond transient absorption spectroscopies reveal that remarkable enhancement originates increased radiative recombination rate density STEs, as result symmetry breakdown wavefunction at octahedral Ag+ site. These findings provide deep insights into -doped , thereby laying foundation future design new emission.

Язык: Английский

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Quintuple-mode dynamic anti-counterfeiting using multi-mode persistent phosphors

Journal of Materials Chemistry C, Год журнала: 2021, Номер 9(46), С. 16634 - 16644

Опубликована: Янв. 1, 2021

Multi-level, dynamic optical anti-counterfeiting has been achieved using multi-mode phosphors as luminescent inks. The ZGGO:Cr,Yb,Er exhibit quintuple luminescence modes, while the ZLGO:Mn possess quadruple modes.

Язык: Английский

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Recent Development of Halide Perovskite Materials and Devices for Ionizing Radiation Detection

Chemical Reviews, Год журнала: 2023, Номер 123(4), С. 1207 - 1261

Опубликована: Фев. 2, 2023

Ionizing radiation such as X-rays and γ-rays has been extensively studied used in various fields medical imaging, radiographic nondestructive testing, nuclear defense, homeland security, scientific research. Therefore, the detection of high-energy with high-sensitivity low-cost-based materials devices is highly important desirable. Halide perovskites have emerged promising candidates for due to large light absorption coefficient, resistivity, low leakage current, high mobility, simplicity synthesis processing compared commercial silicon (Si) amorphous selenium (

Язык: Английский

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Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Advanced Functional Materials, Год журнала: 2022, Номер 32(33)

Опубликована: Июнь 2, 2022

Abstract Designing a sustainable security model that carries multilevel information with numerous optical states will significantly enhance anti‐counterfeiting abilities to deter counterfeits, ranging from artworks, currencies, and foods medicines, but is enormously challenging. Herein, ambient‐friendly, large‐area, quadruple‐level, chiral luminescent materials are prepared by incorporating lanthanide complexes wrapped in poly(ethylene glycol) matrix into nematic cellulose nanocrystal (CNC) films through co‐assembly strategy. Due the regulation of structures, composite enable full‐color structural colors tunable fluorescence. Notably, brightest fluorescent film radiates right‐handed circularly polarized luminescence an asymmetric factor over −0.36, lifetime up 510 µs, absolute quantum yield 66.7%. More interestingly, fascinating chiro‐optical behavior azure khaki can be controlled polarizing filter at given 0° 90° rotation angles. This system showcases comprehensive properties bright responsive photoluminescence, quadruple convertible color, flexible solvent‐resistant abilities. CNC‐derived photonic material act as multimodal label on banknote, which greatly facilitates its development for practical applications.

Язык: Английский

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Efficient Multicolor and White Photoluminescence in Erbium- and Holmium-Incorporated Cs₂NaInCl₆:Sb³⁺ Double Perovskites

Chemistry of Materials, Год журнала: 2022, Номер 34(14), С. 6288 - 6295

Опубликована: Июль 13, 2022

Inorganic lead-free halide perovskites with a broad-band emission of self-trapped excitons (STEs) have attracted great attention in lighting applications. However, it remains fundamental challenge to expand the display color gamut because is difficult individually tune emitting proportion at different wavelengths. Herein, we employ doping route incorporate Sb3+, Er3+, and Ho3+ ions into Cs2NaInCl6, which enables multicolor emissions narrow full width half-maxima high photoluminescence quantum yields (PLQYs). The blue (445 nm) originates from STEs [SbCl6]3– octahedrons, while narrowband green (550 red (655 are mainly derived Er3+ ions, respectively. An efficient energy transfer between multiple luminescent centers key point achieve such an tunable emission. By controlling lanthanide level, can be systematically modulated, cold 10401 K (0.278, 0.286) warm 4608 (0.347, 0.298) adjustable white-light (PLQY ∼70%) achieved successfully. results provide inspiration for material design light-emitting properties optoelectronic

Язык: Английский

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