JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 27
·e54009
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IF 3
Zhiqiang Song,Fei Xu,Heng Wang,Zhencai Zhang,Mi Feng,Yiwen Zhang,Zhao Yang,Jingxue Xie,Dan Su,Tao Li
Poly(isosorbide carbonate) (PIC) is an example of the shift from fossil to bio-based feedstocks in polymeric materials. However, the naturally high hygroscopicity of isosorbide may lead to the bad dimensional stability of its polymers, limiting its application. This work aims to develop a series of isosorbide-based copolycarbonates by introducing hydrophobic groups, such as alkane chains and aromatic rings, into the polymer backbone via one-pot melt polycondensation. As expected, the molecular structure and steric hindrance of the comonomer have a remarkable effect on the water absorption of the copolycarbonates. Among the comonomers, tricyclo[5.2.1.0(2,6)]decanedimethanol with an alkane skeleton bridge effectively reduces the saturation water absorption by 61% compared to PIC. The water absorption mechanism and kinetics of the copolycarbonates are investigated. Moreover, the incorporation of comonomers in PIC not only exhibits stronger hydrophobicity, but also significantly improves its optical properties. Copolycarbonates obtained have a light transmittance of 92% and a refractive index of 1.5394, which are higher than those of PIC, along with better thermal stability, flexibility, and lower glass transition temperature. This work provides a new strategy for the design of isosorbide-based polycarbonates for use in optics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 19
·2200889
·
IF 2
Zhuang Hui,Xueru Liu
Compared with silver nanowires and silver nanospheres, silver nanocubes and silver nanoplates with larger curvature structures like sharp vertices and edges have great potential in optical applications. In general, the controllable joining of silver nanomaterials has become an effective way to change the electrical and optical properties of silver nanomaterials in recent years. However, urgent research on the controllable joining of silver nanocubes or silver nanocubes is still rarely reported. After being thermal treated at 250 °C for 8 min, a good joining among silver nanocubes can be obtained without significant damage to the cubic structure. For laser sintering, with the increase of laser energy input, silver nanocubes gradually transform to spherical particles. Joining among few particles can be observed when silver nanocubes are scanned by 5 W of laser at 1.0 mm s −1 . Obvious joining among silver nanocubes can be obtained by thermal treating at 300 °C for 5 min and laser scanning at 7 W at 0.2 mm s −1 . Thermal heating is more suitable for forming different degrees of connection between silver nanocubes or between silver nanocubes, while laser treatment is suitable for changing the shape of silver nanocubes or silver nanocubes without obvious connection.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Ying Wang,Zeyu Lyu,Pengcheng Luo,Zheng Lu,Dashuai Sun,Taixing Tan,Shuai Wei,Hongyang Zhang,Hanyu Hu,Hongpeng You
A series of solid-solution phosphors Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :Bi 3+ (0.0 ≤ y ≤ 1.0) were created using the high-temperature solid-state reaction. The crystal structure of Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 belongs to trigonal crystal system with space group P321 (150) . The Rietveld refinements indicate that the Bi 3+ ions occupy the Ba 2+ sites. Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :0.03Bi 3+ has tunable luminescence property peaking from 531 to 492 nm as the Sb 5+ ions are gradually replaced by Ta 5+ ions, which are correlated with the crystal field strength variation causing by the substitution of Sb 5+ by Ta 5+ . The thermal stability of the emission at 423 K was improved from 5.4 to 49.9 %. When the obtained Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ /Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ was used as green light component, white LED devices were achieved with low CCT of 4613/4748 K and high Ra of 90.9/95.5. Moreover, multicolor luminescence was constructed by introducing red-emitting Eu³⁺ ions to create Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ and Ba 3 TaGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ phosphors. Under different excitation conditions, the multicolor emissions provide multi-modal and easily distinguishable anti-counterfeiting patterns. Our work demonstrates the feasible construct of tunable emission from Bi 3+ -doped solid-solution phosphors, providing a valuable candidate for diverse optical 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 Polymer Materials
·
2022
·
IF 4.855
Wei Fan,Zhaolu Wang,Xiao Yu,Jiaqi Li,Yan Xu
Depolarizer is an important optical element for high-precision fiber optic gyroscopes in space and long-haul and high-bit-rate fiber transmission optical communication. Carboxylated cellulose nanocrystals prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation prefer to form free-standing films with nematic-like mesostructures whose potential for optical application remains underexploited. Herein, we show that carboxylated cellulose nanocrystals by hydrochloride acid hydrolysis and TEMPO-mediated oxidation self-assemble into nematic-like mesophase that is capable of depolarizing both linearly and circularly polarized light in the visible region. By tuning the carboxylate content at retained fiber aspect ratio, the optimal carboxylated cellulose nanocrystal films to depolarize the visible linearly polarized light with the minimal degree of depolarization of ca. 4% are realized. We present the experimental evidence that birefringent microdomains with substantial variation in the size and orientation acting as numerous waveplates are responsible for the depolarization performance. Finally, we demonstrate how carboxylated cellulose nanocrystal films capable of depolarizing broadband visible circularly polarized light can be leveraged for encrypted patterning.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2015
·
IF 12.881
Fengrui Hu,Huichao Zhang,Chun Sun,Chunyang Yin,Bihu Lv,Chunfeng Zhang,William W. Yu,Xiaoyong Wang,Yu Zhang,Min Xiao
The power conversion efficiency of photovoltaic devices based on semiconductor perovskites has reached ∼20% after just several years of research efforts. With concomitant discoveries of other promising applications in lasers, light-emitting diodes, and photodetectors, it is natural to anticipate what further excitement these exotic perovskites could bring about. Here we report on the observation of single photon emission from single CsPbBr3 perovskite nanocrystals (NCs) synthesized from a facile colloidal approach. Compared with traditional metal-chalcogenide NCs, these CsPbBr3 NCs exhibit nearly 2 orders of magnitude increase in their absorption cross sections at similar emission colors. Moreover, the radiative lifetime of CsPbBr3 NCs is greatly shortened at both room and cryogenic temperatures to favor an extremely fast output of single photons. The above superior optical properties have paved the way toward quantum-light applications of perovskite NCs in various quantum information processing schemes.
研究领域:
材料科学
·
光学
·
量子信息科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 45
·21441-21450
·
IF 7.233
Yuting Cai,Le Wang,Tianliang Zhou,Peng Zheng,Ye Li,Rong-Jun Xie
All-inorganic lead halide perovskite quantum dots (PQDs) have shown great promise for optoelectronic applications due to their unique optical and electrical properties. However, their poor stability against moisture, UV light or thermal attacks greatly hinders their practical applications. One of the reasons for this instability is the proton transfer between oleic acid (OA) and oleylamine (OLA), which induces serious ligand loss. The idea of this work is to prevent the interligand proton transfer by replacing OLA with cetyl trimethylammonium bromide (CTAB) that cannot be protonated. The synthesized CsPbBr3 PQDs in solution show high photoluminescence quantum yields up to 71% and also exhibit higher stability against acetone than the counterparts synthesized using oleylammonium bromide (OLABr). Subsequently, CsPbBr3 PQDs with a peak wavelength of 515 nm (g-CsPbBr3) synthesized using CTAB are further composited with a polymer of carboxyl-functionalized polystyrene (cPS). The composite shows enhanced thermal and moisture stability. It is demonstrated that this green-emitting composite can produce high color gamut (130%) white light-emitting diodes when combined with the K2SiF6:Mn4+ phosphor and a blue InGaN chip, enabling its use in display backlights.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 22
·8145-8152
·
IF 5.7
Dongkai Hu,Mavlanjan Rahman,Shuifu Liu,Lina Shen,Pengpeng Dai,Dawei Wen,Mingmei Wu
While numerous approaches have been devised to optimize the luminescence properties of Eu2+-activated phosphors, the quest for a simple design strategy to achieve color-tunable Eu2+ emission remains a significant challenge. Here, we present a straightforward, doping-free method to tailor the site occupation of Eu2+ and modify its luminescence properties. In the pristine sample, the NaBaB9O15 (NBB) host featuring two cation sites (Na+ and Ba2+), Eu2+ exclusively occupies the Ba2+ site, resulting in blue emission when the NBB:Eu2+ phosphor is synthesized in a H2 reducing atmosphere. When we use CO instead of a H2 reducing atmosphere, impressively, the formation energy required for heterovalent substitution of Na+ by Eu2+ is lowered, leading to the emergence of a distinct green emission band. Significantly, the resultant phosphor NBB:Eu2+@CO exhibits not only a high internal quantum yield of 85.1% and zero-thermal-quenching behavior within the temperature range of 25–200 °C but also wavelength-tunable emission. Benefitting from the multi-color luminescence of the NBB:Eu2+@CO phosphor, its optical applications will no longer be confined to general lighting but extend to anti-counterfeiting and encryption. This study provides a novel design methodology for optimizing the optical properties of Eu2+-activated phosphors.
研究领域:
材料科学
·
光学
·
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）