Thermally Activated Delayed Fluorescence Zirconium‐Based Perovskites for Large‐Area and Ultraflexible X‐ray Scintillator Screens

Advanced Materials, Год журнала: 2022, Номер 34(43)

Опубликована: Сен. 1, 2022

Flexible scintillator screens with environmental stability, high sensitivity, and low cost have emerged as candidates for X-ray imaging applications. Here, a large-scale cost-efficient solution synthesis of the vacancy-ordered double perovskite Cs2 ZrCl6 , which is characterized by thermal activation delayed fluorescence (TADF) dominated triplet emission under irradiation, demonstrated. The large Stokes shift efficient luminescence collection TADF effectively ensure light outcoupling efficiency. Further, flexible an area 400 cm2 are prepared using poly(dimethylsiloxane) (PDMS) carrier, exhibiting excellent scintillation properties yields 49 photons MeV-1 spatial resolutions up to 18 lp mm-1 detection limits 65 nGy s-1 . Finally, high-quality results non-planar dynamic objects such It believed that explored @PDMS would offer big step toward expanding application range scintillators in different environments.

Язык: Английский

---

Heavy-atom engineering of thermally activated delayed fluorophores for high-performance X-ray imaging scintillators

Nature Photonics, Год журнала: 2022, Номер 16(12), С. 869 - 875

Опубликована: Окт. 27, 2022

Язык: Английский

---

Ceramic Wafer Scintillation Screen by Utilizing Near‐Unity Blue‐Emitting Lead‐Free Metal Halide (C₈H₂₀N)₂Cu₂Br₄

Advanced Functional Materials, Год журнала: 2022, Номер 33(5)

Опубликована: Ноя. 18, 2022

Abstract Scintillators with high light yield, low detection limit, large X‐ray attenuation efficiency as well stable and nontoxic compositions are of great importance for radiation applications. Here, 0D (C 8 H 20 N) 2 Cu Br 4 single crystals obtained show blue emission peaking at 468 nm a near‐unity photoluminescence quantum yield 99.7%, Stokes shift 148 (i.e., negligible self‐absorption), good environmental stability along strong absorption capability. Moreover, up to ≈ 91 300 photons/MeV limit 52.1 nGy air s −1 realized, which is more than one hundred times lower the dose rate 5.5 µGy required medical diagnostics. ceramic wafer scintillation screen fabricated by cold pressing sintering process, clear contrast images opaque metal box electronic component spatial resolution 9.54 lp mm realized. This study not only designs new lead‐free halide scintillator, but also develops universal strategy preparation large‐sized scintillator in nondestructive imaging.

Язык: Английский

---

Sequential and Reversible Phase Transformations in Zero‐Dimensional Organic‐Inorganic Hybrid Sb‐based Halides towards Multiple Emissions

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(49)

Опубликована: Окт. 8, 2022

Abstract Zero‐dimensional (0D) metal halides have drawn increasing attention due to the attractive structure dependent photoluminescence (PL) properties. Here, we report two new 0D organic–inorganic hybrid Sb‐based halides, (MTP) 6 SbBr Sb 2 Br 9 ⋅H O (MTP=Methyltriphenylphosphonium, crystal 1) and 5 (crystal 2), featuring a reversible structural phase transformation tunable orange red emissions upon dehydration rehydration of H molecules. Intriguingly, subsequent heat treatment further enables formation glassy state (glass 3) with near‐infrared luminescence, moreover, sequential reverse from glass 3 1 is triggered by acetonitrile water vapor stepwise. The anti‐counterfeiting demo based on PL switching finally achieved thus engineering in expands their multiple applications optical fields.

Язык: Английский

---

Advancing X-ray Luminescence for Imaging, Biosensing, and Theragnostics

Accounts of Chemical Research, Год журнала: 2022, Номер 56(1), С. 37 - 51

Опубликована: Дек. 19, 2022

X-ray luminescence is an optical phenomenon in which chemical compounds known as scintillators can emit short-wavelength light upon the excitation of photons. Since X-rays exhibit well-recognized advantages deep penetration toward tissues and a minimal autofluorescence background biological samples, has been increasingly becoming promising tool for tackling challenges fields imaging, biosensing, theragnostics. In recent years, emergence nanocrystal have further expanded application scenarios luminescence, such high-resolution autofluorescence-free detection biomarkers, noninvasive phototherapy tissues. Meanwhile, holds great promise breaking depth dependency deep-seated lesion treatment achieving synergistic radiotherapy with phototherapy.In this Account, we provide overview advances developing advanced applications theragnostics, optogenetics neuromodulation. We first introduce solution-processed lead halide all-inorganic perovskite that are able to convert photons multicolor luminescence. developed nanoscintillator-based detector imaging internal structure electronic circuits samples. development flexible using solution-processable lanthanide-doped nanoscintillators featuring long-lived image three-dimensional irregularly shaped objects. also outline general principles high-contrast vivo combines functional biomolecules aptamers, peptides, antibodies. High-quality nanoprobes were engineered achieve high-sensitivity various enabled avoidance interference from matrix photon scattering. By marrying probes stimuli-responsive materials, multifunctional theragnostic nanosystems constructed on-demand gas excellent therapeutic effects. taking advantage capability penetrate skull, demonstrated controllable, wireless optogenetic neuromodulation while obviating damage traditional fibers. Furthermore, discussed detail some future terms scintillator synthesis surface modification, mechanism studies, their other potential useful guidance advancing

Язык: Английский

---

Development and challenges in perovskite scintillators for high-resolution imaging and timing applications

Communications Materials, Год журнала: 2023, Номер 4(1)

Опубликована: Март 13, 2023

Abstract Inorganic scintillators play a major role in ionizing radiation detection due to their high versatility detect multiple sources such as X-rays, gamma-rays, alpha, beta, and neutron particles, fast light yield, making them especially convenient for imaging, spectroscopy, timing applications. Scintillators-based systems are found, among various applications, medical homeland security, high-energy physics, industrial control, oil drilling explorations, energy management. This Review discusses advances prospects of perovskite scintillators, particularly low-dimensional hybrid organic-inorganic crystals all-inorganic nanocrystals. We highlight the promise two-dimensional lithium-doped (PEA) 2 PbBr 4 CsPbBr 3 nanocrystals with yields, exceeding 20 photons/keV, decay times less than 15 ns. Such combination may result fast-spectral X-ray an output count rate 30 Mcps/pixel photon-counting computed tomography, coincidence resolution 100 ps positron emission tomography. review recent strategies further improve time, through light-matter interactions extraction efficiency enhancement Purcell-enhanced scintillators. These advancements yields will be useful security

Язык: Английский

---

Mn²⁺‐Based Luminescent Metal Halides: Syntheses, Properties, and Applications

Advanced Optical Materials, Год журнала: 2023, Номер 11(15)

Опубликована: Май 23, 2023

Abstract Lead‐free metal halides are considered a new generation of optoelectronic materials due to their low toxicity, superior properties, ease synthesis, structural diversity, and cost. In particular, Mn 2+ ‐based have earned intensive attention owing high emission quantum efficiency, rich physical properties (e.g., triboluminescence stimuli‐responsivity), cost, toxicity. Due the different coordination environments ions, can exhibit green, red, near‐infrared emissions. This review summarizes recent progress in synthesis methods, mechanisms, photophysical representative applications X‐ray scintillations, white light‐emitting diodes, optical anti‐counterfeiting technologies, fluorescent sensors. Finally, challenges potential research directions toward developing also predicted.

Язык: Английский

---

Copper Iodide Inks for High-Resolution X-ray Imaging Screens

ACS Energy Letters, Год журнала: 2023, Номер 8(3), С. 1362 - 1370

Опубликована: Фев. 10, 2023

Copper-based halide scintillators have attracted considerable interest because of their high light yields, low detection limits, toxicity, and moderate fabrication conditions. Here, we synthesized two Cu(I) iodide inks, comprising zero-dimensional Cu4I6(L1)2 nanoparticles (L1 = 1-propyl-1,4-diazabicyclo[2.2.2]octan-1-ium) one-dimensional Cu4I6(L2)2 nanorods (L2 4-dimethylamino-1-ethylpyridinium) for X-ray imaging application. The exhibited broadband green yellow emission with an ultrahigh photoluminescence quantum yield 95.3% 92.2%, respectively. Consequently, the ink-based screens limits 96.4 102.1 nGy s–1, respectively, which are approximately 55 times lower than dose required standard medical diagnosis (5.5 μGy s–1). Importantly, both scintillation extraordinary resolutions exceeding 30 lp mm–1, more double those conventional CsI:Tl Ga2O2S:Tb scintillators. This study provides a new avenue exploring high-resolution on basis Cu-based ink radiography nondestructive detection.

Язык: Английский

---

2D Perovskite Mn²⁺‐Doped Cs₂CdBr₂Cl₂ Scintillator for Low‐Dose High‐Resolution X‐ray Imaging

Advanced Materials, Год журнала: 2023, Номер 35(26)

Опубликована: Март 27, 2023

High-performance X-ray scintillators with low detection limits and high light yield are of great importance a challenge for low-dose imaging in medical diagnosis industrial detection. In this work, the synthesis new 2D perovskite, Cs2 CdBr2 Cl2 , via hydrothermal reaction is reported. By doping Mn2+ into yellow emission located at 593 nm obtained, photoluminescence quantum (PLQY) :5%Mn2+ perovskite reaches highest value 98.52%. The near-unity PLQY negligible self-absorption enable excellent scintillation performance 64 950 photons MeV-1 limit 17.82 nGyair s-1 . Moreover, combining poly(dimethylsiloxane) to fabricate flexible scintillator screen achieves resolution 12.3 line pairs (lp) mm-1 results suggest that promising candidate high-resolution imaging. study presents approach designing high-performance through metal-ion doping.

Язык: Английский

---

Reversible Triple-Mode Photo- and Radioluminescence and Nonlinear Optical Switching in Highly Efficient 0D Hybrid Cuprous Halides

Chemistry of Materials, Год журнала: 2023, Номер 35(17), С. 6598 - 6611

Опубликована: Авг. 17, 2023

Multifunctional stimuli-responsive luminescent and optical switching is extremely crucial for wide advanced photonic applications, but it remains a challenging objective halide perovskites. Herein, by performing single-crystal to (SC–SC) transformation as dynamic molecular strategy, we realized reversible triple-mode photoluminescence, radioluminescence (PL RL), nonlinear (NLO) in pair of zero-dimensional (0D) hybrid cuprous halides [ETPP]2Cu4Br6 [ETPP]CuBr2. Specifically, [ETPP]CuBr2 display highly efficient yellow green light emissions under UV excitation with the highest quantum yield up near unity. Simultaneously, identical can also be activated using X-ray RL 57,974 photons MeV–1, surpassing most previously reported halides. Most remarkably, SC–SC between them an ethanol impregnation-heating process, which provides PL/RL transitions two light-emitting states. Additionally, this process accompanied transition centrosymmetric NLO-inactive noncentrosymmetric NLO-active through second harmonic generation (SHG) "silent-active" switching. To best our knowledge, first PL, RL, SHG perovskite chemistry, realize applications data storage, information security, logic gates, etc.

Язык: Английский

---