Defects in Ligand‐Exchange‐Passivated Mixed‐Halide Double Perovskite Nanocrystals for X‐ray Imaging DOI Open Access
Gaoyuan Xing,

Endian Cui,

Xiangyang Yuan

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 5, 2024

Abstract Nanostructured scintillators, renowned for their exceptional miniaturization and portability, are typically designed with homogeneous dopant ion concentration profiles. While these profiles facilitate consistent optical properties, they may pose challenges in terms of compromising light emission intensity overall scintillation efficiency. A pressing issue the field X‐ray flat‐panel minidetectors is lack specific innovative strategies to significantly enhance radioluminescence capabilities, which has hindered further advancements. This research showcases an efficacious strategy synthesizing ligand‐exchange‐passivated mixed‐halide double perovskite nanocrystals (NCs) tailored remarkable capabilities. The composition fine‐tuned via anion exchange between Bi 3+ Tb ‐doped Cs 2 AgInCl 6 NCs potassium bromide (KBr). Additionally, initial oleic acid ligands substituted 1‐dodecanethiol (1‐DT), effectively compensating inherent halogen vacancies mitigating halide migration. underlying passivation mechanism elucidated through a comprehensive approach that combined spectroscopic experiments theoretical calculations. Consequently, fabricated transparent scintillator films, incorporating synthesized NCs, exhibit high yield ≈20 952 photons MeV −1 , sensitive detection limit 207.5 nGy air s spatial resolution 8.1 lp mm unparalleled stability under prolonged irradiation.

Language: Английский

Characterization of Cs2AgInCl6: Bridging Optical and Electrical Properties for Advanced Optoelectronic Applications DOI Open Access
Achref Jebnouni, Abdullah A. Alatawi, Mohamed Bouzidi

et al.

Applied Organometallic Chemistry, Journal Year: 2025, Volume and Issue: 39(2)

Published: Jan. 20, 2025

ABSTRACT Lead‐free double perovskites, such as Cs 2 AgInCl 6 , represent a promising class of materials for optoelectronic applications due to their favorable properties and environmental sustainability. This work focuses on the synthesis comprehensive characterization employing range techniques including X‐ray diffraction (XRD) structural verification, thermogravimetric analysis (TGA) assess thermal stability, UV–visible absorption measurements determine optical bandgap energy 3.32 eV. Additionally, we explore photoluminescence (PL) decay elucidate luminescent compound. Complex impedance are performed under both blue red light investigate electrical behavior, revealing two distinct conduction mechanisms: overlapping large–polaron tunneling (OLPT) nonoverlapping small–polaron (NSPT). We analyze implications our findings current–voltage (I–V) behavior trap density, further supported by Raman spectroscopy illumination conditions. The combined insights from characterizations highlight potential in applications, paving way its use advanced devices.

Language: Английский

Citations

1
Efficient Emission of Lanthanide Ion in Double Perovskite Nanocrystals Enabled by Synergistic Effect of Energy Level Modulation and Crystal‐Field Engineering DOI Open Access

Songchao Bai,

Gencai Pan, Chao Li

et al.

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Abstract Trivalent lanthanide (Ln 3+ ) ions with ladderlike 4f energy levels, as dopants, can endow luminescent matrix more diverse optoelectronic properties, and a wider application. However, their intensity is usually limited by the parity forbidden transition rule level mismatch between host dopant. Herein, Ln doped Cs 2 Na 1‐x K x Y 0.97 Sb 0.03 Cl 6 nanocrystals (NCs) are prepared, photoluminescence quantum yields of all samples visible near‐infrared emissions have surprisingly reached over 50%, therein, value Tb 0.6 0.4 NCs dramatically up to 83.3%, which new breakthrough in field lead‐free perovskite NCs. From first principles calculations, crystal structure, spectroscopic analysis, this benefits from synergistic effect deformation levels provided doping environment distortion induced + doping. That is, localized causes splitting ions, resulting effective transfer efficiency simultaneously introducing opposite odd parity, breaking rule, promoting luminescence ions. This work will open route develop efficient materials.

Language: Английский

Citations

1
Tailoring the Emission Properties of Cs2NaLuCl6 for Anti‐Counterfeiting, X‐Ray Scintillation, and Night Vision Applications DOI Open Access

Xiu‐Xian Guo,

Zi‐Lin He,

Jing‐Hua Chen

et al.

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Abstract The ever‐increasing counterfeiting issues have triggered a research upsurge in multi‐modal fluorescence anti‐counterfeiting materials. All inorganic metal halide double perovskites possess the advantages of facile preparation procedures and high thermal stability, which also provide suitable doping sites to regulate emission behavior highlight potential for serving as Herein, series Sb 3+ , Er Yb solely or codoped Cs 2 NaLuCl 6 are successfully prepared, optical properties dependent on ratio lanthanide ions (Ln ). Notably, due participation energy‐transfer cross‐relaxation processes, tri‐doped (0.3%Sb ‐20%Er ‐50%Yb ‐Cs ) shows luminescence responses excitation sources with different photon energies, is employed construct patterns by combining . Besides behavior, NIR from can be used night‐vision device. Remarkably, 20%Er ‐doped an excellent light yield 30767 photons MeV −1 low limit detection (LoD) 108 nGy s highlighting X‐ray imaging. This work provides rational route design multi‐functional materials that anti‐counterfeiting, night vision,

Language: Английский

Citations

1
In Situ Growth of Lead‐Free Double Perovskite Micron Sheets in Polymethyl Methacrylate for X‐Ray Imaging DOI
Jindou Shi, Zeyu Wang,

Luxia Xu

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 3, 2024

Abstract Pb‐free double‐perovskite (DP) scintillators are highly promising candidates for X‐ray imaging because of their superior optoelectronic properties, low toxicity, and high stability. However, practical applications require DP crystals to be ground mixed with polymers produce scintillator films. Grinding can compromise film uniformity optical thereby affecting resolution. In this study, an in situ fabrication strategy is proposed facilitate the crystalline growth Cs 2 AgIn x Bi 1‐x Cl 6 micron sheets polymethyl methacrylate a single step. By adjusting 3+ /Bi ratio, 0.9 0.1 /PMMA composite films (CFs) excellent scintillation properties obtained, including light yield up 32000 photons per MeV detection limit 87 nGy air s −1 . This also enabled production large CFs, which demonstrated favorable flexibility stability, fabricating products advanced eligibility commercial applications. The CFs exhibited outstanding performances imaging, producing high‐resolution structures providing new avenue development materials fields such as medical safety detection.

Language: Английский

Citations

3
Lead-Free Halide Double Perovskites for Sustainable Environmental Applications DOI Creative Commons
Ruby Jindal, Archana Tripathi, Chandra Mohan

et al.

Chemical Physics Impact, Journal Year: 2024, Volume and Issue: 9, P. 100770 - 100770

Published: Nov. 7, 2024

Language: Английский

Citations

3
Near-Infrared and Visible Dual-Band Self-Trapped Exciton Emissions from Li+-Doped Cs2NaScCl6 Double Perovskites DOI
Yuhan Liu, Datao Tu,

Mingjie Yang

et al.

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2150 - 2159

Published: April 4, 2025

Language: Английский

Citations

0
Sb3+ doped Cs3YCl6 metal halides with highly efficient broad-band green emission for light-emitting diode and X-ray imaging DOI

Huwei Li,

Long Tian,

Qingxing Yang

et al.

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Language: Английский

Citations

0
Machine learning screening and DFT calculations for exploring Cs2Ag0.75X0.25BiCl6 (X=Na, K, Rb) double perovskites as underwater photovoltaic materials DOI
Changcheng Chen, Han Zhao,

Yaxin Xu

et al.

Solar Energy Materials and Solar Cells, Journal Year: 2025, Volume and Issue: 289, P. 113674 - 113674

Published: May 2, 2025

Language: Английский

Citations

0
Defects in Ligand‐Exchange‐Passivated Mixed‐Halide Double Perovskite Nanocrystals for X‐ray Imaging DOI Open Access
Gaoyuan Xing,

Endian Cui,

Xiangyang Yuan

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 5, 2024

Abstract Nanostructured scintillators, renowned for their exceptional miniaturization and portability, are typically designed with homogeneous dopant ion concentration profiles. While these profiles facilitate consistent optical properties, they may pose challenges in terms of compromising light emission intensity overall scintillation efficiency. A pressing issue the field X‐ray flat‐panel minidetectors is lack specific innovative strategies to significantly enhance radioluminescence capabilities, which has hindered further advancements. This research showcases an efficacious strategy synthesizing ligand‐exchange‐passivated mixed‐halide double perovskite nanocrystals (NCs) tailored remarkable capabilities. The composition fine‐tuned via anion exchange between Bi 3+ Tb ‐doped Cs 2 AgInCl 6 NCs potassium bromide (KBr). Additionally, initial oleic acid ligands substituted 1‐dodecanethiol (1‐DT), effectively compensating inherent halogen vacancies mitigating halide migration. underlying passivation mechanism elucidated through a comprehensive approach that combined spectroscopic experiments theoretical calculations. Consequently, fabricated transparent scintillator films, incorporating synthesized NCs, exhibit high yield ≈20 952 photons MeV −1 , sensitive detection limit 207.5 nGy air s spatial resolution 8.1 lp mm unparalleled stability under prolonged irradiation.

Language: Английский

Citations

1