ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Dongying Fu,Yanli Ma,Shufang Wu,Qi Wang,Ruifang Zhao,Lin Pan,Junhua Luo
Pyro-phototronic effect (PPE) can significantly boost the performance of hybrid perovskite (HPs) photodetectors due to the effective modulation of photogenerated charge carrier separations, transportation, and extraction. However, there are few reports on the application of PPE in lead-free HPs. Herein, a polar lead-free HP (1,3-BMACH)BiBr5 [1,3-BMACH = 1,3-bis(aminomethyl)cyclohexane] is synthesized and realized broadband self-powered photoresponse from X-rays to near-infrared (NIR) through the PPE. Particularly, this light-induced PPE in lead-free HPs breaks the limitation of the optical band gap, making them suitable for broadband self-powered photodetection. Under 405 nm illumination, compared with a purely photovoltaic system, Iphoto+pyro is boosted by 3100%, and R and D* are both enhanced by 260% after coupled PPE. It is particularly interesting that an obvious X-ray-induced PPE phenomenon is also observed, which endows (1,3-BMACH)BiBr5 with a high sensitivity of 154 μC Gy–1 cm–2 and a low detection limit of 307 nGy s–1 under the self-powered mode. The implementation of light-induced PPE from X-rays to NIR in lead-free HPs provides a new approach for constructing environmentally friendly, broadband, and self-powered optoelectronic devices in the future.
研究领域:
材料科学
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光电技术
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纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Jianhang Zhao,Yongjie Yuan,Lei Chen,Ye Li,Hailiang Zhang
Liquid crystalline physical gels (LCPGs) with stable mechanical properties and fast electro-optical response properties were prepared through the self-assembly of side chain liquid crystalline polymers (SCLCPs) with different spacer length poly [ω-4′-cyano-(1, 1′-biphenyl)] acrylate (PmACB, m is the spacer length of SCLCP, m = 0, 2, 4) as gelators in a nematic liquid crystal , 4-pentyl-4′-cyanobiphenyl (5CB). The gel-sol phase transition temperature (T GS ), micro morphology, mechanical properties and electro-optical properties of LCPGs (SCLCPs/5CB) were systematically studied. The results show that only P0ACB can form stable liquid crystalline physical gels in 5CB and show excellent thermal stability, good self-supporting ability and fast electro-optical response properties. The T GS of 6 wt% P0ACB/5CB gel is 192 °C, and it also showed stable mechanical properties, its storage modulus is about 1.0 × 10 4 Pa. The threshold voltage (V th ) and saturation voltage (V sat ) of P0ACB/5CB gel with 3 wt% concentration are 0.29 V μm −1 and 3.906 V μm −1 respectively, and the off state response time is only 6.748 ms. Moreover, the addition of the polymer does not affect the electro-optical response of the LCPGs.
研究领域:
材料科学
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液晶技术
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
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IF 3.754
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Jianwei Zhao,Decai Li,Zhenghong He
A method was investigated to improve the capacitance and electro-optical response of the dilute magnetic polymer-dispersed liquid crystals (PDLC). The proposed magnetic separation treatment further decreased the ion concentration of the liquid crystal colloid while preparing the diluted magnetic PDLC. The microstructure of the optimized diluted magnetic PDLC, including the shape, size, and distribution of the LC droplets, has not changed, but the capacitance and the electro-optical response of the PDLC have been further improved. Usually, increasing the concentration of the magnetic nanoparticles may reduce the ion concentration more, but the performance of PDLC has been a disadvantage. Our presented work shows an additional decrease in the ion concentration by doping the relatively high concentration of the magnetic nanoparticles and the magnetic separation treatment. However, the performance of the diluted magnetic PDLC has improved even more.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2022
·
IF 2.676
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Guoqing Li,Jianwei Zhao,Yingning Miao,Wenjian Li,Wenjiang Ye,Decai Li,Zhenghong He
In this paper, the microstructures of the dilute magnetic PDLC films, doped with low concentrations of γ-Fe2O3 nanoparticles, have hardly changed, but their electric-optical responses have distinctly changed. The experimental results show that the threshold voltage and hysteresis decreased with the increasing concentration of γ-Fe2O3 nanoparticles. Furthermore, at the relatively low concentration of γ-Fe2O3 nanoparticles (samples (0) and (1) according to ϕm of 0 and 0.11%), the reciprocity of the rise time increased nonlinearly with the increasing square of the applied voltage. However, at the relatively high concentration of γ-Fe2O3 nanoparticles (samples (2) according to ϕm = 0.15%), the reciprocity of the rise time increased linearly with the square of the applied voltage. Moreover, the reciprocity of the decay time was independent of the applied voltage and decreased with increasing the concentration of γ-Fe2O3 nanoparticles. These characteristics are due to the adsorption of free ions by γ-Fe2O3 nanoparticles. As a result, the interfacial interaction between liquid crystal droplets and the polymer matrix decreased, and the effective electric field inside the liquid crystal droplets increased.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2018
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IF 2.975
Ye Li,Jianhang Zhao,Lei Chen,Yongjie Yuan,Hailiang Zhang
A series of side chain liquid crystalline polymers (SCLCPs) poly[ω-4′-cyano-(1, 1′-biphenyl)] acrylate (P0ACB) with different molecular weight were prepared and used as gelator to fabricate liquid crystalline physical gels (LCPGs). The relationship between molecular weight of side chain liquid crystalline polymers and the properties of liquid crystalline physical gels were also discussed in detail. Testing results showed that when the molecular weight of polymers was less than 3.61 × 10 4 , the minimum gelation concentration (MGC) of liquid crystalline physical gels decreased from 3 wt% to 0.2 wt% and gel-sol phase transition temperature (T GS ) increased from 99 °C to 185 °C with increasing molecular weight. The driving voltage and contrast ratio increased obviously and the off state response time decreased with increasing molecular weight. However, when the molecular weight of polymers was greater than 3.61 × 10 4 , the stability and the electro-optical response properties of the liquid crystalline physical gels basically unchanged. The mechanical properties of liquid crystalline physical gels were affected significantly by the molecular weight of polymers. The energy storage modulus of liquid crystalline physical gels increased from 1.6 × 10 3 Pa to 3.1 × 10 4 Pa with increasing molecular weight when the gelator concentration is 6.0 wt%.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2023
·Vol. 14
·期 34
·9041-9047
·
IF 8.4
Zhi-Jie Wang,Hao-Fei Ni,Tie Zhang,Jie Li,Meng-Meng Lun,Da-Wei Fu,Zhi-Xu Zhang,Yi Zhang
As an innovative form of stimulus-response materials, organic–inorganic hybrid phase transition materials have become a wonderful contender in the field of functional electronic equipment due to their versatile structure, intensive functions and straightforward preparation. However, the targeted regulation and optimization of the electrical/optical response, along with the establishment of regular structure–performance relationships, pose significant challenges in meeting the diverse demands of practical applications over an extended period. Herein, we conducted a systematic investigation into the role of lattice void occupancy in regulating phase transition temperature (Tp) and related optical/electrical bistability. By taking hybrid material [TMEA][Cd(SCN)3] featuring a flexible ammonium cation [TMEA]+ (TMEA = ethyltrimethylammonium) as the prototype, we successfully synthesized three phase transition materials, namely [DEDMA][Cd(SCN)3], [TEMA][Cd(SCN)3] and [TEA][Cd(SCN)3] (DEDMA = diethyldimethylammonium, TEMA = triethylmethylammonium, and TEA = tetraethylammonium), and the excellent regulation of the physical properties of these compounds was achieved through subtle engineering of void occupancy. More strikingly, [TEA][Cd(SCN)3] exhibits remarkable bistable properties in terms of dielectric and nonlinear optical responses (with second-harmonic generation intensity reaching 2.5 times that of KDP). This work provides a feasible avenue to reasonably customise organic–inorganic hybrid phase transition materials and finely adjust their intriguing functionalities.
研究领域:
材料科学
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电化学
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光电学
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化学
✓ 已验证
DOI
高影响因子
Molecular Systems Design & Engineering
·
2024
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IF 3.2
Junheng Chen,Haoteng Lin,Xintong Wang,Dinggui He,Baoyi Luo,Yuanyuan Guo,Wangqiao Chen,Guofu Zhou
Electrowetting display (EWD) is among the most promising reflective display technologies due to its full-color capabilities and fast video-speed performance. The colored EWD inks are typically prepared by dissolving soluble organic dyes in non-polar solvents, which significantly influence the color performance, electro-optical behaviour, and longevity of EWD devices. In this study, density functional theory (DFT) at the PBE1PBE/6-31G* level and time-dependent density functional theory (TD-DFT) at the M06-2X/6-31G* level were utilized to calculate a series of benzobisthiadiazole-based donor-acceptor-donor (D-A-D) type near-infrared organic dyes for EWDs, providing structural and spectral data to aid in spectral assignment. The quantum chemical calculations' results align with our experimental synthesis data, showing molecular colors spanning blue, green, and cyan. Detailed investigations into the properties of these dyes, including absorption, electro-optical response, and photo-stability were conducted. The experimental outcomes indicate that these organic dyes are excellent candidates for EWD application.
研究领域:
材料科学
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化学
·
显示技术
·
理论化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）