OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiao Qu,Binquan Zhao,Qi Zhu
In the field of information encryption, multi-mode luminescent materials that can emit light in response to different forms of excitation are very important. Here, ZnAl 2 O 4 : x Ti 4+ ( x = 0, 0.25%, 0.5%, 0.75%, 1%, 1.25%) and ZnAl 2 O 4 :1%Ti 4+ , y Cr 3+ ( y = 0.1%, 0.2%, 0.3%) optical materials were synthesized by solid-state reaction method. The crystal structure does not significantly change after doping Ti 4+ and Cr 3+ . The single-doped Ti 4+ samples output blue light at 440 nm. Further doping Cr 3+ with y = 0.1%, 0.2% and 0.3%, the emission color shifts from blue to red under 254 nm excitation. There is energy transfer of Ti 4+ →Cr 3+ , and the largest efficiency is 54.0% at y = 0.3%. Because the thermal stabilities of emissions for Ti 4+ and Cr 3+ are quite different, the emissions at 440 nm (Ti 4+ ) and 700 nm (Cr 3+ ) exhibit significantly different responses to temperature. Furthermore, varying the excitation lights from 254 nm to 365 nm also yields different light outputs. Finally, three typical samples were designed for letters “CHN”. The “CHN” logo outputted lights of different colors at different temperatures, and the optical signals varied under different excitations. The colorful emission with different modes can be coded to achieve the application of multi-mode anti-counterfeiting, indicating that they have broad application prospects in this area.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Bingbing Cui,Chuanpan Guo,Zhihong Zhang,Guodong Fu
Heterojunction engineering is an acceptable strategy in promoting the separation efficiency of electron/hole pairs in the photochromic process. Here, a series of novel solid-state photochromic ZnCo-PBA@WO 2.72 heterojunctions have been designed and prepared in the current study. The cubic ZnCo-PBA were selected as templates to directly grow WO 2.72 amorphous layer using phosphotungstic acid (PW 12 ) as precursors with the assistance of polyvinyl pyrrolidone (PVP). The as-obtained ZnCo-PBA@WO 2.72 heterojunctions have a core–shell structure and the appropriate band energy promote the UV-generated electrons transport from ZnCo-PBA to WO 2.72 . Consequently, the ZnCo-PBA@WO 2.72 heterojunctions exhibit excellent photochromic performance, converting from white to light-grey in 10 s and finally turning into dark-grey in 60 s under UV lamp stimulation. Meanwhile, the WO 2.72 outer layer was more easily in contact with oxygen in air and thus speeds up the oxidation process of W 5+ to W 6+ , allowing the colored ZnCo-PBA@WO 2.72 heterojunctions to return to their original colorless condition within 15 min. The solid-state photochromic ZnCo-PBA@WO 2.72 heterojunctions was then used as repeatable information storage media, data encryption and decryption based on coloration-decoloration behaviors. This study presents a meaningful way to integrate WO 2.72 with MOFs to expand the range of photochromic materials and further to broaden theirs application in optical 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
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Chuandong Zuo,Wei Tang,Chaoyang Ma,Chen Chang,Kaifu Fan,Yingkui Li,Xuanyi Yuan,Zicheng Wen,Yongge Cao
Inorganic photochromic (PC) materials are increasingly being considered potential candidates for security and optical storage applications. Although great progress has been made in inorganic photochromic materials, it is still challenging to reach both strong photochromic efficiency and large luminescence modulation in inorganic materials . In this work, an effective method is proposed to simultaneously achieve strong photochromic efficiency and large luminescence modulation in ferroelectric oxides BaMg 0·28 Zr 0·16 Ta 0·56 O 3 : Dy 3+ (BZMT: Dy 3+ ) via inducing a large number of oxygen vacancies . The obtained BZMT: Dy 3+ ceramics exhibits a reversible white-black color change (∼59.5%) upon alternating illumination at 365 nm and 450 nm (or thermal stimulus 300 °C). Meanwhile, a large luminescence modulation (∼87.6%) had been achieved in BZMT: Dy 3+ due to the well overlap between the absorb peak of BZMT and the emission peaks of Dy 3+ . Benefiting from these excellent properties, the obtained BZMT: Dy 3+ ceramics can be used as electronic devices, security, and information storage multifunctional materials. Moreover, this study provides an effective method for developing other inorganic photochromic materials.
研究领域:
材料科学
·
光学
·
陶瓷
·
光化学
·
安全技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qingqing Liu,Chaofan Hu,Xiaomin Wang
Tungsten oxide has attracted considerable attention as a typical photochromic material. Herein, a simple route for the synthesis of tungsten oxide quantum dots (WO 3-x QDs) was demonstrated which was accomplished by the hydrothermal treatment of ammonium tungstate hydrate in the present of polyvinyl pyrrolidone (PVP). This photochromic material can rapidly undergo a color change reaction under the irradiation of ultraviolet or solar light. More importantly, the bleaching can be completed in a dark environment for 5 min and the cycle stability is excellent. The ultra-small size, existence of oxygen deficiency, and the surface modification by PVP are attribute to fast photochromic performance, excellent reversibility and cycling stability of WO 3-x QDs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Bionic Engineering
·
2022
·Vol. 19
·期 6
·1589-1600
·
IF 2.995
Wang Peng,Zhang Xuesong,Wang Zhihao,Chen Tao,Zhang Honglian,Duan Wei,Han Huilong
Both thermochromic and photochromic coating have attracted many attentions due to their widely applications, but the low stability is a big obstacle. Inspired by the lotus leaf, to endow the chromic coating with superhydrophobicity is a possible solution. In this research, a dual response coating was prepared by adding photochromic and thermochromic particles simultaneously. The prepared sample demonstrated at least four-state color switching, which can be successfully used in tactile imaging, multi-color fabric, erasable record, and security labels. The superhydrophobicity was achieved by introducing vinyl-terminated polydimethylsiloxane, which not only offers low surface energy but also can cross-link with the particles to increase the adhesion. Thus, the prepared sample maintained superhydrophobicity after various kinds of destruction (such as sandpaper abrasion, corrosive liquid attack, ultrasonic treatment, UV irradiation, and high-speed drops/turbulent jets impact). Even though the superhydrophobicity can be destroyed by plasma etching, it can be recovered after 12 h at room temperature.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
·
2019
·Vol. 31
·期 6
·739-746
·
IF 0.934
Rui Xue,Xinghua Zhang,Jintao Tian
In this study, a spiropyran derivative (SPOH) is firstly grafted onto a polymer backbone of a poly(acrylic acid) (PAA) via an esterification process. The synthesized spiropyran-modified poly(acrylic acid) (PAA-SP) polymer is characterized by FTIR and 1H NMR. The synthesized PAA-SP is then dissolved into water to achieve water-soluble micelles. The optical behaviors of PAA-SP micelles are investigated by ultraviolet-visible (UV-Vis) absorption spectra and fluorescence emission spectra under acid/base and light stimuli in aqueous solution. Our experimental results reveal that the as-prepared PAA-SP micelles are water-soluble and show good photochromic and emissive behaviors. Meanwhile, the optical behaviors of the micelles are light-responsive and acid/base-responsive and hence can be tailored via the adjustments of both light and pH value of the solution sample. And our results may be meaningful for practical application of hydrophobic spiropyran derivatives in aquatic environments.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yongqi Yang,Jiaqi Li,Xinyao Li,Lin Guan,Zijian Gao,Lijie Duan,Fei Jia,Guanghui Gao
Paper, for writing and printing, is consumed a lot in modern life. However, the production of conventional paper could cause many problems, such as deforestation and environmental pollution. Therefore, it is necessary and urgent to explore novel strategies to solve these problems. In this work, a polyoxometalate-doped gelatin film with high strength, excellent transparency, and fast photochromic properties is designed and prepared. The film can display different colors by using a variety of reagents, exhibiting its potential application as a paper medium. Its rapid photochromic properties allow complex high-resolution images to be displayed by UV light printing. It is found that the mechanical and photochromic properties could be regulated by the introduction of triethylene glycol, and the fading process could be controlled by changing the temperature and humidity. Moreover, it is rewritable, self-repairable, and recyclable, and can also achieve long-term preservation without fading. It is envisioned that the environmentally friendly films with low cost, ease of preparation, and recycling advantages have the potential to be an alternative to conventional paper for writing and printing.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Dong-Xue Xia,Xin Wang,Wen-Qi Sun,Rui-Lian Lin,Jing-Xin Liu,Ying-Wei Yang
Inspired by Chameleons' skin color tuning in response to environmental changes, we design and prepare three inclusion complexes based on the cucurbit[7]uril (Q[7]) host and three viologen guests. Upon light irradiation, the colors of these inclusion complexes in the solid state turn from light colors to vivid three primary colors, i.e., red, green, and blue, respectively. Ultraviolet–visible (UV–vis) diffuse reflectance and electron spin resonance (ESR) spectra reveal that the photochromism can be attributed to the generation of viologen radicals, originating from the photoinduced electron transfer. The results of quantum chemical calculation indicate that Q[7] in the inclusion complexes acts as the electron donor in the photoinduced electron transfer process. Using a color mixing approach and finely manipulating the proportions of the three inclusion complexes, a series of composite photochromic materials (CPMs) can be manufactured, covering a full-color gamut in visible light. On the other hand, due to the ignorable size and shape change of CPMs during the photochromatic processes, the CPMs-based reversible photochromic “printing” and photofading “erase” properties were also used for quick response (QR) code. Therefore, these prominent intelligent features of CPMs open new avenues to explore optical regulated nano-platforms for multiple anti-counterfeiting, biomimetics, and military camouflage applications.
研究领域:
材料科学
·
化学
·
仿生学
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Jinghua Zhao,Yajie Yang,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Both the colourful cholesteric liquid crystal polymer network (CLCN) patterns and the gratings have attracted much attention for their applications as optical materials. Herein, the photochromic cholesteric liquid crystal (CLC) mixtures were prepared using a photoisomerizable chiral dopant. The structural colour of the CLC mixtures was tunable by changing the chiral dopant concentration and the intensity of the 365-nm irradiation light. The CLCN gratings with a structural colour were prepared using the UV nanoimprinting lithography method. The structural colours of the CLCN gratings originate from both the cholesteric and the grating structures. Moreover, a patterned CLCN grating was prepared using a photochromic CLC mixture, which could be applied for decoration and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 7
·4067-4078
·
IF 3.809
Xuan Junji,Tian Jintao
The cellulose colloidal particles with good photochromic and photoluminescent performances had been developed in aqueous solution based on a spiropyran-grafted filter paper cellulose (SP–cellulose) in this study. The insoluble filter paper cellulose dramatically became soluble in ethanol after grafting a spiropyran derivative onto its backbone via esterification. During this process, the optical properties of the spiropyran had been successfully inherited. With the aid of ultraviolet and visible light, the obtained SP–cellulose colloidal particles showed light-induced tunability on both photochromism and photoluminescence, corresponding to the significant change of the spiropyran between weak polar ring-closed spiropyran and strong polar ring-opened zwitterionic merocyanine. Based upon this result, the SP–cellulose colloidal particles were finally obtained in water by follow-up dialysis process. In comparison to the pure spiropyran showing poor optical properties in mixed solvent of ethanol/water, the obtained SP–cellulose colloidal particles in water showed good photochromic and photoluminescent performances as well as fine stability. Considering also the raw material of filter paper being cheap and easy to get as well as the facile preparation process of the functional colloidal particles, our experimental results may bring about more promising applications of spiropyran species and water-insoluble cellulose in aqueous medium.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yongqi Yang,Lin Guan,Guanghui Gao
Traditional optoelectronic devices without stretchable performance could be limited for substrates with irregular shape. Therefore, it is urgent to explore a new generation of flexible, stretchable, and low-cost intelligent vehicles as visual display and storage devices, such as hydrogels. In the investigation, a novel photochromic hydrogel was developed by introducing the negatively charged ammonium molybdate as a photochromic unit into polyacrylamide via ionic and covalent cross-linking. The hydrogel exhibited excellent properties of low cost, easy preparation, stretchable deformation, fatigue resistance, high transparency, and second-order response to external signals. Moreover, the photochromic and fading process of hydrogels could be precisely controlled and repeated under the irradiation of UV light and exposure of oxygen at different time and temperature. The photochromic hydrogel could be considered applied for artificial intelligence system, wearable healthcare device, and flexible memory device. Therefore, the strategy for designing a soft photochromic material would open a new direction to manufacture flexible and stretchable devices.
研究领域:
材料科学
·
生物医学工程
·
智能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lin Guan,Yongqi Yang,Fei Jia,Guanghui Gao
Photochromic hydrogels have attracted considerable attention owing to their potential application in optical devices. However, the weak mechanical properties severely limited their applications. Here, a novel photochromic hydrogel with high transparency, high stretchability and rapid photochromic responsiveness has been successfully designed and prepared by introducing a redox photochromic material (Mo) into the hybrid hydrogel. The photochromic hydrogel with rapid photochromic response achieved discoloration process within only 3 s and the fading process could be easily performed under the air environment. Moreover, the ability to rewrite and erase optical information have been implemented on the photochromic hydrogels. Therefore, this strategy of photochromic hydrogel would contribute to design a new generation of optical display 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
危险品化学品经营许可证（带存储）