DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 1
·257-263
·
IF 4.39
Qi Gu,Wenqian Wang,Hao Lu,Xi Chen,Shuaihua Wang,Shaofan Wu
Lanthanide–organic frameworks (LnOFs) have been brought into focus due to their unique structure–function relevance, and have shown good application prospects in many fields. According to the characteristics of scintillating materials, we synthesized two isomorphic LnOFs with the lanthanides terbium and europium as emission centers: Tb(bmb)3·H2O (LnOF-1) and Eu(bmb)3·H2O (LnOF-2). Tb3+ and Eu3+ were used as X-ray absorption centers, and large conjugated organic ligands were used as energy transfer bridges, which can effectively convert X-rays into visible light. LnOF-1 and LnOF-2 show good X-ray scintillation performance and anti-radiation stability. At the same time, we prepared a LnOF-1 mixed matrix scintillating film by the physical deposition method for X-ray imaging experiments, and its spatial resolution can reach 9.5 lp mm−1@MTF20%. The excellent imaging application effect prospect makes the lanthanide–organic frameworks show development potential in the field of scintillating materials.
研究领域:
材料科学
·
放射学
✓ 已验证
产品关联
DOI
PubMed
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
Optical Materials Express
·
2021
·Vol. 11
·期 4
·1004-1013
·
IF 3.442
Hongliang Zhao,Tengteng Li,Qingyan Li,Chengqi Ma,Jie Li,Chenglong Zheng,Yating Zhang,Yating Zhang,Jianquan Yao,Jianquan Yao
The monolithic stacked design is expected to solve the challenges of wiring difficulties, complex fabrication processes, and low resolution. However, a photodetector array with low operating voltage that is suitable for imaging applications has not been proposed. Here, a perovskite photodetector array with a monolithic stacked structure is proposed. The CH3NH3PbI3 photodetector has a low power consumption off-state (0 V) and on-state (−2 V) voltage, and the highest responsivity and specific detectivity of 0.39 A/W and 4.53×1012 Jones at 775 nm, respectively. The rise time and decay time are 111 µs and 250 µs respectively. In addition, the imaging application shows high contrast, which provides a simple and effective way to prepare high performance perovskite imaging devices.
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 Photonics
·
2025
·
IF 6.7
Weidong Song,Jun Wei,Junxing Lv,Huimin Duan,Hainan Qin,Jiaquan Li,Weijia Yang,Bingqian Li,Shuti Li
Spectrally selective photodetectors (SSPDs) are crucial components in diverse fields, such as telecommunications, environmental surveillance, and medical diagnostics. Typically, these devices rely on external optical filters to selectively detect light within a narrow spectral band. While this scheme is effective, it adds complexity to the system architecture and raises manufacturing costs, which can also potentially lead to a decrease in sensitivity. Alternatively, the formation of heterojunctions between conductive filters and semiconductors can develop SSPDs that not only possess simplified architecture but also exhibit inherent self-filtering capabilities. In this work, we introduce an amorphous WO3/GaN heterojunction ultraviolet SSPD that exhibits a distinct detection peak at 370 nm, with a full width at half-maximum of less than 20 nm. The WO3 thin films were deposited photochemically under ultraviolet light by using a metal chloride precursor. The SSPD offers excellent photodetection performance, with a high photo-to-dark current ratio of 6.19 × 104, a high responsivity of 495 mA/W, and an excellent specific detectivity of up to 3.31 × 1011 Jones at −5 V, all of which are significantly improved compared to the crystalline WO3/GaN device. Additionally, our SSPD shows promise for selective imaging applications within the near-UV spectrum.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dong Yang,Kun Ge,Huiyun Ban,Huiping Yuan,Sen Qian,Zhehao Hua,Hua Cai,Danping Chen,Jifeng Han,Xvsheng Qiao,Jing Ren,Xinyuan Sun,Gao Tang,Shenghua Yin,Minghui Zhang,Jiawen Xiao
A series of Ce 3+ -doped Gd 2 O 3 -GdF 3 -Al 2 O 3 -B 2 O 3 -SiO 2 glass scintillators (GSC x and GLC x ) were successfully synthesized in reducing atmosphere for future imaging application. The transmittance of GSC x glasses exceeds 85 % in range of 500–800 nm, and the cut-off edge red shifts as the Ce 3+ concentration increases. In photoluminescence (PL), GSC x glass scintillators have a 360–600 nm broadband emission with a shoulder peak at around 450 nm. Meanwhile, the PL lifetime of GSC x glasses is close to the CeF 3 crystals, and the PL QY of GSC 3 glass scintillator reaches up 70.2 %. For scintillation application, the integral XEL intensity of GSC 2 and GSC 3 glasses is 31.3 % and 24.4 % of that of BGO crystal. GLC 2 and GLC 3 glasses exhibit similar spatial resolution of approximately 7 lp·mm −1 . Moreover, the light yields of GSC 2 and GSC 3 glass scintillator are 1702 and 1690 ph/MeV excited by γ-ray, respectively. The nonproportionality of GSC x glasses is less than 3 % in the range of 100–1400 keV due to the large density and Z eff . As Ce 3+ concentration increases, both the fast and slow components of the glasses decrease (103.7 ns–89.7 ns, 1454.4 ns–1012.8 ns), and the proportion of fast component also increased from 3.3 % to 4.7 %. For γ-ray imaging, the scintillation light events of the glass can be observed from SiPM array, and the central position (−2, −1) have the highest count rate of the system. The results show that GSCx and GLCx glass scintillators deserve further development for future applications.
研究领域:
材料科学
·
核医学
·
生物医学工程
·
辐射探测
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Yijun Luo,Yuxia Luo,Yuxi Liu,Yin Huang,Ping Yu,Hao Ma,Xinping Li,Zhao Zhang,Cuiling Zhang,Chaohao Chen,Philip A. Gale,Guochen Bao
Upconversion nanoparticles (UCNPs) are characterized by high photostability, narrow spectral bands, excellent tuneability, and low biotoxicity, facilitating a broad range of biomedical applications. However, the small size required in many biological applications implies a lower luminescent brightness, as large surface-to-volume ratio is always accompanied with severe surface quenching. Herein, we introduce a strategy to overcome the surface quenching by incorporating an acceptor dye, sulforhodamine B (SRB) to surpass energy relaxation on long-lived lanthanide excited states. The surface modification of SRB led to up to 98.8% energy transfer efficiency, accompanied with the emergence of an intense SRB emission, with four orders of magnitude of change in the SRB/UCNPs emission ratio. The further structural optimisation led to an 8-fold upconversion emission enhancement. Moreover, the system exhibits excellent photostability, with only a 25% reduction over two hours under intense irradiation. By incorporating a pH responsive 5-carboxytetramethylrhodamine (5-TAMRA) to the UCNPs, we achieved a self-referencing protochromic sensor that are specific to protons and resistant to interference from various metal ions. This work provides a facile method for enhancing small-sized nanocrystals for biomedical sensing and imaging applications.
研究领域:
纳米技术
·
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Qilin Wei,Tongtong Kou,Tong Chang,Liang Wang,Xinxin Han,William W. Yu
Ruddlesden−Popper phases Cs2CdCl4 and Cs3Cd2Cl7 are widely used in experimental research of optoelectronics due to their excellent doping matrix properties, but their optoelectronic mechanisms have not been fully explored. This study uses first-principles calculations and experiments to analyze the differences in point defect crystal growth and optoelectronic properties caused by Sb doping of these two materials. Sb tends to replace the position of Cd in both structures. Additional doping energy levels are introduced in the Sb doping of Cs2CdCl4, and the flat band edge increases the local charge density and improves the electron-hole recombination efficiency. The photoluminescence quantum yield (PLQY) of 0.1% Sb:Cs2CdCl4 doping is as high as 79.09%. Molecular dynamics simulations show that the octahedral distortion of [SbCl6]3– in Cs2CdCl4 is highly sensitive to temperature, and the Jahn–Teller distortion causes the formation of self-trapped excitons, which is more conducive to the generation of exciton recombination luminescence. In contrast, Sb doping of Cs3Cd2Cl7 produces a lower PLQY, which can be explained by the more delocalized charge distribution at its band edges and the lower octahedral structural distortion. Sb:Cs2CdCl4 exhibits high-performance X-ray imaging capabilities. This work provides valuable insights and guidance for optimizing Sb-doped Cd-based optoelectronic materials.
研究领域:
光电材料
·
材料科学
·
凝聚态物理
·
计算材料学
·
X射线成像技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 46
·26028-26035
·
IF 12.732
Jingyang Xu,Pengpeng Lu,Li Wang,Yong Fan,Weijun Tian,Jianing Xu,Jie Zhao,Luquan Ren,Weihua Ming
Antifogging coatings prepared by highly hydrophilic/superhydrophilic strategies are susceptible to general oil contamination, hence readily losing their activities. Herein, a stimuli-responsive antifogging/oil-repellent coating with a delicate balance between hydrophilic and oleophobic components was prepared via a UV-assisted cross-linking method. Initially, different contents of acrylate monomers, including acrylic acid (AA), 1H,1H,2H,2H-tridecafluoro-n-octyl acrylate (TFOA), and 4-benzoylphenyl acrylate (BPA) were thermally polymerized to obtain a series of terpolymers, poly(AA-co-TFOA-co-BPA). Afterwards, poly(AA-co-TFOA-co-BPA) was covalently tethered to varied substrate surfaces (i.e., glass slides, PC, PET, and PVC) through a UV triggered anchoring of BPA. Benefiting from the delicate balance between hydrophilic poly(AA) and oleophobic poly(TFOA), the resultant coating displays solvent sensitive stimuli-responsive wettability, driven by the encountered liquids with different surface tensions. Therefore, these coatings show excellent anti-fogging ability with ∼90% light transmission, in a wide temperature range from −20 °C to 85 °C, meanwhile, the coatings also display remarkably high oil-repellence with an extremely low sliding angle for low tension liquids. These findings support the development of functional coatings that can highly maintain antifogging performances while effectively avoiding oil contamination in various imaging, medical and analytical applications.
研究领域:
材料科学
·
化学工程
·
表面化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）