Advanced Electronic Materials
·
2021
·Vol. 7
·期 8
·2100291
·
IF 7.295
Jie Lao,Wen Xu,Chunli Jiang,Ni Zhong,Bobo Tian,Hechun Lin,Chunhua Luo,Jadranka Travas-Sejdic,Hui Peng,Chun-Gang Duan
Artificial synapse of neuromorphic computing has been attracting significant attention as an alternative concept for next-generation computing. Here, a two-terminal synaptic device based on potassium iodide (KI) and CH 3 NH 3 PbI 3 (MAPbI 3 ) hybrid film (KI–MAPbI 3 ) is reported. The use of KI as an additive in the film preparation process greatly reduces grain boundaries, facilitating the improvement of device performance. The prepared synaptic device exhibits dual response to electric and light stimuli due to the unique properties of MAPbI 3 . Besides the successful simulation of biological synaptic functionalities such as paired-pulse facilitation (PPF), plasticity in long-term potentiation (LTP), and long-term depression (LTD), the learning behavior of human under different moods and Pavlov's dog experiment are also simulated by combining electric and light stimuli. For image recognition, the simulation result shows that the device achieves an accuracy of 84.2% under light illumination after only 1500 learning phases.
研究领域:
神经形态计算
·
材料科学
·
仿生学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 13
·4492-4499
·
IF 6.4
Xulong Lv,Xihui Shan,Yi Zhang,Yanjie Liang
Photostimulated luminescence (PSL) materials have attracted considerable attention in many important fields, varying from radiation dosimetry and biomedical imaging to security encryption and optical data storage. Nevertheless, monochromatic light illumination is usually used as the stimulus source to realize the absolute separation between the PSL signal and the excitation light. Furthermore, a dark environment is considered necessary to get rid of the interference from polychromatic ambient light. Herein, we report a glow-in-the-daylight material, YBO3:Pr3+, which can emit intense and long-lasting ultraviolet-C (UVC) persistent luminescence in a bright indoor lighting or outdoor sunlight environment after ceasing X-ray excitation. We note that although the YBO3:Pr3+ phosphor shows very weak UVC afterglow in darkness, remarkable enhancement of UVC persistent luminescence can be observed in a bright ambient light environment. The UVC persistent luminescence peaking at 274 nm can last for more than 24 h under the illumination of 900 lux white LED light, and the UVC luminescence signal is free from the interference of the ambient light. This enhancement of UVC persistent luminescence is assigned to the continuous and efficient photostimulation of polychromatic ambient light, which has been confirmed by comprehensive spectroscopic investigations. The appealing glow-in-the-daylight phenomenon from the YBO3:Pr3+ phosphor will not only lay the foundation to develop more UVC persistent phosphors suitable for working in a bright environment, it will also promote the widespread use of these storage phosphors across a broad range of applications such as microbial inactivation and optical tagging.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wei Meng,Xiaoyan Fu,Chunqing Fu,Wenzhi Sun,Changsheng Wang,Hongwu Zhang
Here, we have developed a novel ultra long ultraviolet-A afterglow material CaMgGeO 4 : Bi 3+ , which shows more than 24 h UVA afterglow emission peaked at 346 nm. The crystal structure shows that the prepared sample is a pure phase with an orthogonal system of Pmnb space group. The composition of valence band and conduction band was analyzed by the density of states , which reveals that the bandgap of the CaMgGeO 4 matrix is 3.69 eV. The photoluminescence spectrum of the sample consists of a broadband in the 320–400 nm UVA region, which belongs to the 3 P 1 → 1 S 0 electron transition of Bi 3+ . More importantly, under the excitation of ultraviolet lamp for 3 min, CaMgGeO 4 : Bi 3+ exhibited an UVA ultra long persistent luminescence (LPL) with a duration of more than 24 h, which afterglow emission intensity still reaches 1500 cps and is about 6 times of the background intensity. In addition, the UVA emission of CaMgGeO 4 : Bi 3+ after 13 h day can be repeatedly by short periods of low-energy light sources stimulation. The thermoluminescence analysis indicates that the presence of shallow and deep traps is responsible for excellent UVA-LPL and photo-stimulate luminescence (PSL). The excellent LPL and PSL properties can prompt CaMgGeO4: Bi 3+ phosphor to be widely used in the field of photodynamic therapy.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 24
·8457-8466
·
IF 4.39
Shao Yan,Yanjie Liang,Yafei Chen,Jingwei Liu,Dongxun Chen,Zhengwei Pan
Visible and infrared persistent phosphors have gained considerable attention in recent years and are being widely used as glow-in-the-dark materials in dark environments. In contrast, the progress in persistent phosphors emitting at the other end of the spectrum, i.e., the shorter-wavelength ultraviolet-C (UVC; 200–280 nm), is rather slow. Here we report the design and synthesis of a well-performing Pr3+-doped UVC emissive persistent phosphor, Lu2SiO5:Pr3+, which exhibits intense UVC persistent luminescence peaking at 270 nm and a long persistence time of more than 12 h after excitation with a 254 nm UV lamp. Besides, the UVC persistent luminescence of a UV pre-irradiated sample can be repeatedly revived after repeated short-illumination with low-energy white light via a process called photostimulated persistent luminescence. Owing to the distinct spectral features of UVC light and the self-sustained luminescence properties, the UVC persistent luminescence of the Lu2SiO5:Pr3+ persistent phosphor can be clearly monitored and imaged using a corona camera in bright environments including direct sunlight and indoor light. The Lu2SiO5:Pr3+ persistent phosphor is expected to find promising applications in the covert optical tagging field.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Feng Gao,Qing Pang,Dangli Gao,Chaoyang Jia,Hong Xin,Yong Pan,Yuhua Wang,Sining Yun
Photostimulable luminescence (PSL) nanophosphors, which exhibit superior features including controllable energy storage and efficient photon release upon light stimulation, are desirable for optical signal storage. However, trap tuning of the storage phosphor remains a great challenge. Herein, the PSL of Zn2GeO4:Mn2+ nanophosphors is enhanced via creating deep traps through nonequivalent Pr3+ doping. The possible enhanced mechanisms are analyzed combined with doping models using the first-principles theory. A mechanism is proposed based on changing the coordination environment of Mn2+, creating deep traps and tuning the band gap structure, and thus providing the chance for electrons’ photoionization and PSL generation. As a result, the prepared nanophosphors demonstrate the superior functionalities for optical signal storage. This work not only offers an insight into defect engineering through doping strategies for developing PSL materials but also supplies a good candidate for optical information storage.
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
Advanced Science
·
2024
·Vol. 11
·期 26
·2402824
·
IF 14.3
Chen Fei Dai,Qing Li Zhu,Olena Khoruzhenko,Michael Thelen,Huiying Bai,Josef Breu,Miao Du,Qiang Zheng,Zi Liang Wu
Creatures, such as Venus flytrap and hummingbirds, capable of rapid predation through snap-through transition, provide paradigms for the design of soft actuators and robots with fast actions. However, these artificial “snappers” usually need contact stimulations to trigger the flipping. Reported here is a constrained anisotropic poly( N -isopropylacrylamide) hydrogel showing fast snapping upon light stimulation. This hydrogel is prepared by flow-induced orientation of nanosheets (NSs) within a rectangular tube. The precursor containing gold nanoparticles is immediately exposed to UV light for photopolymerization to fix the ordered structure of NSs. Two ends of the slender gel are clamped to form a buckle with bistability nature, which snaps to the other side upon laser irradiation. Systematic experiments are conducted to investigate the influences of power intensity and irradiation angle of the laser, as well as thickness and buckle height of the gel, on the snapping behaviors. The fast snapping is further used to kick a plastic bead and control the switch state. Furthermore, synergetic or oscillated snapping of the gel with two buckles of opposite directions is realized by inclined irradiation of a laser or horizontal irradiation with two lasers, respectively. Such light-steered snapping of hydrogels should merit designing soft robots, energy harvests, etc.
研究领域:
软体机器人
·
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Mingqing Cui,Zhiyun Wei,Pengfei Zhao,Chunli Jiang,Chunhua Luo,Hechun Lin,Junliang Zhao,Xiaodong Tang,Hui Peng
To address the challenges faced by a traditional computing system with von Neumann architecture, various artificial synapses and neurons have been developed. In this work, a two-terminal device was developed using an organic p-type semiconductor copper phthalocyanine (CuPc) and a molecular ferroelectric diisopropylammonium bromide (DIPAB). The incorporation of the ferroelectric layer DIPAB not only introduces an energy barrier for the migration of photogenerated carriers to enhance the device’s synaptic performance but also enables the modulation of the device response to the light pulses by changing the polarization state of DIPAB. The device successfully mimics the biological synaptic functions including paired-pulse facilitation (PFF), spike-rate-dependent plasticity (SRDP), and spike-number-dependent plasticity (SNDP). The device is employed to recognize MNIST handwritten digits, achieving a recognition rate of over 75% for MNIST handwritten digits even with 50% noise interference. These results suggest the device’s potential for neuromorphic computing.
研究领域:
材料科学
·
神经科学
·
计算机科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yifan Cheng,Shilu Zhu,Hui Ma,Shengting Zhang,Kun Wei,Shiyu Wu,Yongkang Tang,Ping Liu,Tingting Luo,Guangli Liu,Runhuai Yang
The potential applications of hydrogel microrobots in biomedicine and environmental exploration have sparked significant interest in understanding their behavior under multiphysical fields. This study explores the multimodal locomotion and dynamic interaction of hydrogel microrobots at the air–water interface under magnetic and light stimuli. A pair of hydrogel microrobots at the air–water interface exhibits a transition from cooperative, combined rotation to interactive behavior, involving both rotation and revolution under the influence of a rotating magnetic field (RMF), and a shift from attraction to separation under near-infrared (NIR) light, demonstrating the dynamic modulation of their behaviors in response to different stimuli. Notably, the behavioral patterns of multiple hydrogel microrobots under multiphysical fields indicate that NIR light can enhance interactive motion behaviors under RMFs and extend the range of motion trajectories. Dynamic models for each condition are established and analyzed based on dynamic equilibrium, and their behavior can be modulated by parameters such as magnetic particle concentration, magnetic field frequency, and NIR light intensity. This work introduces a novel strategy for regulating and controlling the dynamic behaviors of hydrogel microrobots, offering new insights into their multiphysical field locomotion.
研究领域:
生物医学工程
·
材料科学
·
机器人学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 7
·期 1
·168-182
·
IF 8.683
Peiran Huang,Zuhui Wen,Yue Yu,Jingyi Xiao,Zhanhua Wei,Tianshuai Lyu
X-Ray or 254 nm UV-light charged storage phosphors have various promising applications such as in anti-counterfeiting and information storage. However, developing such storage phosphors with high charge carrier storage capacity remains challenging. In this work, photoluminescence spectroscopy, thermoluminescence (TL), and vacuum-referred binding energy (VRBE) diagram were combined to study the trapping and liberation processes of charge carriers in Bi3+ and/or Ln3+ (Ln = Tb, Pr, or Dy) doped LiLuGeO4. Unintended defects act as good electron trapping centers, while Bi3+, Tb3+, and Pr3+ act as hole-capturing and recombination centers. Dy3+ does not act as an electron trapping center but as a luminescence center by energy transfer from Bi3+ → Dy3+. The ratios of the integrated TL intensities between 303 K and 650 K for LiLuGeO4:0.005Bi3+, LiLuGeO4:0.005Bi3+,0.005Tb3+, or LiLuGeO4:0.005Bi3+,0.005Dy3+ after X-ray charging to that of the state-of-the-art BaFBr(I):Eu2+ is about 1.24, 0.59, and 0.90, respectively. More than 10 h or 40 h afterglow was measurable in both LiLuGeO4:0.005Bi3+ and LiLuGeO4:0.005Bi3+,0.005Tb3+ after X-ray or 254 nm UV-light charging. The stored charge carriers stored can be efficiently excited to produce optically stimulated luminescence with a wide range 365 nm UV-light to 850 nm infrared laser beam. Proof-of-concept colour-tailorable afterglow, X-ray irradiation time or sample mass-dependent dosimetry, and optically-stimulated luminescence with a wide range of 365 nm UV-light to 850 nm infrared laser stimulation will be demonstrated for anti-counterfeiting, information storage, and display applications in the developed Bi3+ and/or Ln3+-doped LiLuGeO4. This work not only reports Bi3+ and/or Ln3+ doped LiLuGeO4 storage phosphors with excellent charge carrier storage capacity but also deepens our understanding of the afterglow and storage phosphors and luminescence mechanisms, which can guide us to explore new afterglow and storage phosphors for multimode applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yulong Ye,Huijuan Yuan,Heyi Yang,Qinan Mao,Fangyi Zhao,Yang Ding,Meijiao Liu,Jiasong Zhong
With the rapid advancement of information technology, the demand for data storage has grown significantly, and optical information storage has attracted considerable attention due to its unique advantages. However, current storage technologies are primarily based on single-channel and visible light regions, limiting the security of existing optical information storage. Thus, it is necessary to develop new materials and a multi-channel encryption strategy based on invisible light. In this work, we report a Ruddlesden-Popper phase Ba 2 SnO 4 phosphor with photostimulated luminescence (PSL) properties, and enhance its near-infrared emission through fluorine substitution to achieve multi-level optical information encryption. The enhanced mechanisms are elucidated by investigating the effects of fluorine-induced lattice distortion and the enrichment of self-trapped excitons (STEs) due to increased oxygen vacancies. Additionally, density functional theory calculations reveal the influence of F substitution on the formation energy of oxygen vacancies, providing insight into the specific oxygen vacancy sites that contribute to the enrichment of STEs. Furthermore, it is observed that the PSL properties exhibit repeatable capabilities. Based on this, a dual-channel encryption scheme using visible and invisible light for information encoding is designed, offering a new approach to optical information storage and encryption.
研究领域:
材料科学
·
光学工程
·
信息加密
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 11
·3375-3385
·
IF 2.657
Haibo Liu,Baoluo Feng,Li Luo,Chunlong Han,Peter A. Tanner
The phosphor Sr0.97Al2O4:0.01Eu2+, 0.02Dy3+ was synthesized by a high temperature solid state reaction in a reducing atmosphere. After charging by ultraviolet radiation, the persistent luminescence decay was divided into different time ranges and well-fitted by a biexponential function, but the two lifetimes became longer with time of persistent luminescence decay. The fractional amplitude of the shorter lifetime increased with time, whereas that of the longer lifetime decreased. The change in lifetime has been associated with the emptying of a pseudo-continuum of trap states either from different traps or different levels of the same trap species. The investigation in photostimulated persistent luminescence indicated the sample could emit bright persistent luminescence again under infrared light excitation after the UV light-excited persistent luminescence had decayed completely. The NIR photostimulation exhibited a continuous broad band, with maximum at 760 nm, representing the emptying of filled traps into the conduction band. These results also infer that the traps are pseudo-continuous but the assignment of Dy2+ as the trapped species cannot be excluded. The read-in and write-out properties of the phosphor have been elucidated and these convey applications in information storage and retrieval.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 43
·2303889
·
IF 19
Ying Wu,Xuwen Wu,Aicheng Zhang,Xinping Ouyang,Hongming Lou,Dongjie Yang,Yong Qian,Xueqing Qiu
Lignin exhibits a long-active UV-blocking property due to its macromolecular aromatic structure and unique semiquione-quione-hydroquione transition. However, its poor absorbance in UVA region (320–400 nm) and irregular aggregation are still the obstacles. Herein, active spirapyrane (SP-Br) is synthesized and covalently introduced into alkali lignin (AL) to construct photo-stimulated UV-absorbing enhancement sunscreen actives (AL-SP n ). The introduction of SP significantly improved the absorbance of AL in UVA region and its aggregation is effectively eased. When the optimal AL-SP 3 solution is exposed to UV irradiation, the color turned purple, and the absorbance in UVA region further improved as the unconjugated SP transformed into conjugated merocyanine (MC) structure. When the light is removed, the solution recovered light yellow. The antioxidant property of AL endow the reversible SP-MC transformation with good cyclic stability. As-prepared AL-SP 3 based sunscreen exhibit obvious photo-stimulated enhancement effect. The sun protection factor (SPF) improved from 23 to 89 after 4 h irradiation, and can maintain the high performance for another 8 h. In addition, it exhibit low permeation and good biocompatibily in vitro and vivo, demonstrating its good potential in practical use.
研究领域:
材料科学
·
化学工程
·
生物学
✓ 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）