Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 25
·9636-9643
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IF 8.067
Kuangnan Lyu,Enhai Song,Zhiguo Xia
Doping engineering in lead-free all-inorganic halide perovskites plays an important role in their performance modulation for emerging photonics applications. Benefiting from the weak electron phonon coupling effect, and the distorted site occupied by Eu2+, chloride perovskite phosphor KCaCl3 : Eu2+ is prepared and demonstrated herein, which shows high-efficiency (internal quantum efficiency, IQE = 96.1%) blue emission peaking at ∼430 nm as well as good thermal stability (74%@ 423 K of the initial integrated intensity at 298 K). This phosphor also has high radiation luminescence intensity (∼7.1 times that of commercial Lu3Al5O12 : Ce3+) upon X-ray excitation and a low detection limit (483.5 nGyair s−1), exhibiting good potential in X-ray detection and imaging. This work provides new insights into the design of Eu2+ activated halide perovskite luminescent materials for versatile optoelectronic applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenqing Zhang,Hu Wang,Zhilong Chen,Pengxiang Wang,Xin Liu,Hao Dong,Jiaoling Zhao,Yun Cui,Yuchuan Shao
High-energy radiation detectors with a good imaging resolution, fast response, and high sensitivity are desired to operate at a high electric field. However, strong ion migration triggered by electrochemical reactions at the interface between a high-potential electrode and an organic–inorganic hybrid perovskite limits the stability of radiation detectors under a high electric field. Herein, we demonstrate that such ion migration could be effectively suppressed in devices with a Ti cathode, even at a high electric field of 50 V mm–1, through time-of-flight secondary-ion mass spectrometry. X-ray photoelectron spectroscopy illustrates that Ti–N bonds formed at the interface of MAPbBr3 perovskite single crystals/Ti electrode effectively inhibit the electrochemical reaction in organic–inorganic hybrid perovskite devices and ultimately improve the operating stability under a high electric field. The device with a Ti electrode reaches a high sensitivity of 96 ± 1 mC Gyair–1 cm–2 and a low detection limit of 2.8 ± 0.3 nGy s–1 under hard X-ray energy.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18366-18374
·
IF 8.067
Qi Shao,Jun Yan,Weiqiang Gong,Yan Li,Feng Gao,Baoning Wang,Lin Li
Inorganic double perovskites have been widely used in photodetection and X-ray detection due to their nontoxic composition, large atomic number, and simple crystal growth from solution. However, double perovskites have a lower formation energy, which introduces additional antisite defects, resulting in a higher trap-state density. Here we report dopant-compensated double perovskite Cs2AgBiBr6−xClx single crystals (SCs) based on solution processing, which reduces the trap state density of the single crystals, enabling enhanced photodetection and ray detection capabilities of the device at room temperature. The dopant-compensated Cs2AgBiBr5.933Cl0.067 has a significantly improved mobility of 129 cm2 V−1 s−1. By using Cl ion doping, the Cs2AgBiBr5.933Cl0.067 SCs achieve excellent device performance in photodetection and X-ray detection, including a broad spectral response, a high responsivity of 60.8 mA W−1, a fast response time of 8 μs/566 μs, a superior X-ray detection sensitivity of 714 μC Gyair−1 cm−2, and a minimum dose rate as low as 36.48 nGyair s−1. Furthermore, the device exhibits high-fidelity photo-imaging at 5 V. All results demonstrate that an effective Cl ion doping strategy provides a great opportunity for developing functional detection devices.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 26
·2214660
·
IF 19
Zeng-Kui Zhu,Tingting Zhu,Jianbo Wu,Shihai You,Panpan Yu,Xitao Liu,Lina Li,Chengmin Ji,Junhua Luo
2D chiral hybrid perovskites have recently emerged as outstanding semiconductor materials. However, most of the reported 2D chiral perovskites have limited structural types and contain high levels of toxic lead, which severely hinders their further applications. Herein, by using a mixed-cation strategy, an unprecedented type of lead-free cluster-based 2D chiral hybrid double perovskite derivatives are successfully obtained, [( R / S -PPA) 4 (IPA) 6 Ag 2 Bi 4 I 24 ]·2H 2 O ( 1-R and 1-S ), and [( R / S -PPA) 4 ( n -BA) 6 Ag 2 Bi 4 I 24 ]·2H 2 O ( 2-R and 2-S ) ( R / S -PPA= R / S –1-phenylpropylamine; IPA=isopentylamine; n -BA= n -butylamine). Their inorganic skeletons are linked by binuclear {Bi 2 I 10 } and infinite chain {Ag 2 Bi 2 I 14 } ∞ , in which bismuth clusters and multiple coordination modes (e.g., tetrahedral AgI 4 and octahedral AgI 6 ) are introduced into the double perovskite system for the first time. This introduction induces distortion of the inorganic layer, which may facilitate the transfer of chirality from the chiral cations into achiral double perovskite skeletons. Further, circular dichroism measurements and circularly polarized light detection confirm their inherent chiral optical activities. In addition, 1-S exhibits an ultralow X-ray detection limit of 129.5 nGy s −1 , which is 42-fold lower than that of demands in regular medical diagnosis (5.5 µGy s −1 ). This study provides a pathway to construct novel type of lead-free cluster-based double perovskite derivatives.
研究领域:
材料科学
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光学
·
辐射检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 22
·10260-10270
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IF 4.682
Zhang Fa,Lin Zhengguo,Xie Lingling,Li Xitao,Lu Bingheng,Zhao Ziheng,Jiang Ting,Wang Min,Wu Yafeng,Zhou Quan,Xiao Jiawen,Chen Bingkun,Wang Yongtian
Abstract Copper-based lead-free perovskite derivatives have recently drawn great attention for their excellent optoelectronic properties and potential applications in light-emitting diodes (LEDs) and photodetectors. Herein, facile synthesis methods of cooling crystallization and wet ball milling (WBM) are adopted to synthesize K 2 CuCl 3 , resulting in single crystals (SCs) and powder samples, respectively. The as-fabricated K 2 CuCl 3 samples exhibit blue–violet emission, with the highest photoluminescence quantum yield (PL QY) of 70% (under 280 nm excitation), and the photoluminescence (PL) is attributed to the self-trap excitons (STEs) emission. We also test the scintillation properties of K 2 CuCl 3 for X-ray detection and imaging applications. A down-conversion LED is finally made by using K 2 CuCl 3 as phosphor. Graphical abstract
As-synthesized K2CuCl3 can be used for either photoluminescence under UV
light or X-ray imaging under X-ray radiation. -- Present in ms
研究领域:
材料科学
·
光学
·
放射学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 9
·2200020
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IF 10.947
Shuhang Tian,Zhenguo Shi,Yongsheng Sun,Pengyu Zhang,Sheng Wu,Dongdan Chen,Puxian Xiong,Qi Qian,Zhongmin Yang
Though widely applied in light-emitting diode (LED) lighting and X-ray detection, respectively, rare-earth ions doped phosphor and scintillating single crystals still face many challenges in practicalities, like aging of package material and difficulty to construct tiny array structure. Using phosphate glass as the host is quite beneficial for solving these problems while enabling distinguished luminescence. Therefore, Eu 3+ and Tb 3+ doped phosphate glasses which, respectively, show strong red/green emissions are researched. Superior thermal stabilities (78.69% and 89.35% emission intensities remain at 150 °C) and high internal quantum efficiencies (87.3% and 68.6%) are found to guarantee the excellent photoluminescence performances. The brilliant X-ray excited luminescence properties are demonstrated by general 19.49% and 34.74% integrated emission intensities of that of commercial Bi 4 Ge 3 O 12 single crystal scintillator with the change of X-ray power. Meanwhile, Tb 3+ doped scintillating fiber is drawn. Finally, excited by 380 nm LED, color manipulation and white light generation are achieved in LEDs with a structure of stacked emitting layers (mainly Eu 3+ and Tb 3+ doped phosphate glasses). Many of the as-constructed white LED's performance parameters are much better than the commercial white LED. These results show that Eu 3+ and Tb 3+ doped phosphate glasses possess promising potential in LED lighting and X-ray detections.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 35
·9071-9076
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IF 5.236
Zhilin Wang,Xieming Xu,Shuaihua Wang,Hui Xu,Weiwei Xu,Qingyou Zeng,Guoping Deng,Yongzheng Jiang,Shaofan Wu
Graphical Cerium-ion doped lead-free double perovskite crystals (Cs 2 NaTbCl 6 ), were found to have significantly improved sensitivity and the double perovskite crystals (Ce : Cs 2 NaTbCl 6 ) showed excellent ability to resist X-ray radiation damage. In addition the composite film of Ce : Cs 2 NaTbCl 6 crystals can reach a detection limit of 30 nGy ⋅ s −1 of X-ray detector, with the capability to clearly distinguishing the spatial resolution of 10 lp/mm. Scintillators are widely used for nondestructive testing, nuclear medicine imaging, space exploration and security inspection. Recently, lead halide perovskite scintillation crystals have been brought into focus due to their effective atomic number, fast scintillation decay time, strong luminous efficiency, and tunable band gap. However, their application is limited by lead toxicity. Here we report that Ce-doping can increase sensitivity in lead-free double perovskite crystals (Cs 2 NaTbCl 6 ) for X-ray detection and imaging. The introduction of Ce ions as sensitizer can be used to improve the radioluminescence of the crystals. The light output of Ce : Cs 2 NaTbCl 6 crystals is about 52153 ph/MeV, which is 25 % higher than that of un-doped crystal. The X-ray sensitivity is significantly enhanced. Based on our scintillation film X-ray detector the detection limit is 30 nGy ⋅ s −1 , which is about 1/183 of the typical medical imaging dose. Our scintillating film has excellent imaging ability with spatial resolution of up to 10 lp/mm. This research shows that Ce : Cs 2 NaTbCl 6 perovskite crystal scintillators are promising materials for X-ray imaging application.
研究领域:
材料科学
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医学影像
·
放射学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 21
·2102730
·
IF 16.806
Xiuwen Xu,Wei Qian,Jian Wang,Jiecheng Yang,Jianwei Chen,Shuang Xiao,Yongshuai Ge,Shihe Yang
Perovskite materials in different dimensions show great potential in direct X-ray detection, but each with limitations stemming from its own intrinsic properties. Particularly, the sensitivity of two-dimensional (2D) perovskites is limited by poor carrier transport while ion migration in three-dimensional (3D) perovskites causes the baseline drifting problem. To circumvent these limitations, herein a double-layer perovskite film is developed with properly aligned energy level, where 2D (PEA) 2 MA 3 Pb 4 I 13 (PEA=2-phenylethylammonium, MA=methylammonium) is cascaded with vertically crystallized 3D MAPbI 3 . In this new design paradigm, the 3D layer ensures fast carrier transport while the 2D layer mitigates ion migration, thus offering a high sensitivity and a greatly stabilized baseline. Besides, the 2D layer increases the film resistivity and enlarges the energy barrier for hole injection without compromising carrier extraction. Consequently, the double-layer perovskite detector delivers a high sensitivity (1.95 × 10 4 μ C Gy air −1 cm −2 ) and a low detection limit (480 nGy air s −1 ). Also demonstrated is the X-ray imaging capacity using a circuit board as the object. This work opens up a new avenue for enhancing X-ray detection performance via cascade assembly of various perovskites with complementary properties.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Da Chen,Guangda Niu,Shiqiang Hao,Liubing Fan,Jing Zhao,Christopher Wolverton,Mengling Xia,Quanlin Liu
Halide double perovskites have attracted substantial attention for optoelectronic applications owing to their low toxicity and high stability. However, double perovskites have strict requirements in terms of the halide type, thus rendering many of their properties unchangeable, including the band gap, atomic number, and carrier transport. By introducing long-chain organic amines, the chloride site of double perovskites can be completely replaced by bromide. Using this strategy, two dimensions silver–indium–bromide double perovskites (PEA)4AgInBr8 and (i-BA)4AgInBr8 were successfully synthesized [(PEA)+ = C6H5(CH2)2NH3+, (i-BA)+ = CH(CH3)2CH2NH3+]. Density functional theory calculations and spectroscopy characterizations were performed to unveil the semiconducting behaviors and photoluminescence properties of the title compounds. Electrical characterization confirms their good carrier-transport property (μτ product: 2.0 × 10–3 cm2 V–1) and low dark current. Moreover, the presence of heavy atoms, together with the ultrastable baseline contributes to a high X-ray detection sensitivity (185 μC Gyair–1 cm–2), greater than that of most previous double-perovskite detectors. Our work lays the foundation for broadening the family of potential double perovskites, creating a new path for the realization of long-sought perovskites with low toxicity and high stability that retain good optoelectronic performance.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Huamin Wang,Haodi Wu,Yeming Xian,Guangda Niu,Weinan Yuan,Huanyong Li,Hang Yin,Peng Liu,Yi Long,Wenzhe Li,Jiandong Fan
CsxFA1–xPbI3 single crystals are expected to provide more excitement in optoelectronic applications, including photodetector, laser, light-emitting diode, etc. Herein, we aim to gain an in-depth understanding of the growth mechanisms of perovskite single crystal with various morphologies in view of microscopic dynamics by the combination of component, structure, and solvent engineering. A sequence of CsxFA1–xPbI3 (0 ≤ x ≤ 0.14) perovskite single crystals with a dodecahedron morphology and tunable aspect ratio can be obtained by means of a solution-processed uniform-cooling approach. The optimized Cs0.1FA0.9PbI3 single crystals prepared in γ-butyrolactone mixed with dimethyl sulfoxide are theoretically and experimentally demonstrated to have superior performances, e.g., extremely higher long-term stability, lower trap density, and higher mobility. The broadband absorption, i.e., 300–910 nm, enables its application in near-infrared detection (880 nm), and the corresponding detector demonstrates higher responsivity at different light intensities and a fast photocurrent response (τ1 = 11 μs, τ2 = 10 μs). Equally important, we also explore the application of optimized Cs0.1FA0.9PbI3 single crystals with a tunable aspect ratio in an X-ray detector and the extremely high sensitivity (2772.1 μC Gyair–1 cm–2 under a bias of 150 V) demonstrates their good potential for radiation detection.
研究领域:
材料科学
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光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiong Zhang,Renyan Huang,Zhongyuan Zhang,Hao Lu,Hongyuan Sha,Xieming Xu,Yi Zheng,Xin Huang,Shuaihua Wang,Shaofan Wu
Lead-free perovskites have recently attracted huge interest in direct-type radiation detectors. In this work, a zero-dimensional perovskite-like halide Cs 2 CoCl 4 is prepared by an all-water solvent method that enables large-area production for X-ray imaging. The outstanding radiation detection performance of Cs 2 CoCl 4 is demonstrated by a single crystal device. Specifically, the X-ray detector based on Cs 2 CoCl 4 single crystal has a large carrier mobility-lifetime ( μτ ) product of 1.63 × 10 −4 cm 2 V −1 under X-ray irradiation, a sensitivity of up to 2421 μC Gy air −1 cm −2 at 287.8 V mm −1 , and it could detect X-ray as low as 54.3 nGy air s −1 . In addition, Cs 2 CoCl 4 @fiber composite films prepared by aqueous solution evaporation are used to confirm the feasibility of X-ray imaging application. The uniformity of composite films is achieved by adjusting pressure and concentration to control homogeneous nucleation and growth. Excitingly, a switching test lasting more than 300 min at a dose rate of 1169 μGy air s −1 indicates that Cs 2 CoCl 4 @fiber has excellent radiation stability. As a proof of concept, a 5 × 5 pixelated detector array is prepared to achieve a clearly observed outline of the imaged object, offering an inspiring material design strategy conducive to realizing environmentally friendly film devices.
研究领域:
材料科学
·
辐射探测
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 22
·2313776
·
IF 18.5
Fapeng Sun,Haojie Xu,Wenting Hong,Zhihua Sun,Wei Liu
Metal thio(seleno)phosphates are renowned for their multifaceted physical characteristics and versatile applications, particularly in optoelectronics. In detection applications, a low and stable dark current is crucial, enhancing the sensitivity and signal-to-noise ratio of detectors. Herein, a van der Waals layered material has synthesized, CuInP 2 Se 6 . Despite its nanometric scale, 2D CuInP 2 Se 6 detector transcends the conventional absorption inefficiencies tied to ultrathin materials. It delivers exceptional ultraviolet–visible detection, characterized by an ultralow, stable dark current of 150 fA, and a noise power density of 27.7 fA Hz −1/2 at room temperature. The in-depth investigation reveals a responsivity of 4.47 A W −1 , an external quantum efficiency of 1369%, a special detectivity of 1.44 × 10 13 Jones, and a rapid response speed of 280 µs, positioning it at the pinnacle of 2D photodetector performance. The CuInP 2 Se 6 ’s ultralow, stable dark current paves the way for X-ray detection, achieving an unprecedented sensitivity of 1.32 × 10 5 µC Gy air −1 cm −2 and a low detection limit of 0.15 µGy air s −1 . Furthermore, 2D CuInP 2 Se 6 detector exhibits a remarkable image-sensing capability, adeptly capturing intricate patterns with high resolution. This discovery indicates its promise in revolutionizing integrated micro/nano optoelectronic devices, opening avenues for advancements in light and X-ray detection and imaging technologies.
研究领域:
材料科学
·
光学
·
医学成像
✓ 已验证
DOI
高影响因子
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