Article
Engineering, Environmental
Changtong Zhou, Yong Qi, Shufen Zhang, Wenbin Niu, Suli Wu, Wei Ma, Bingtao Tang
Summary: The construction of novel photonic structures enables the creation of stimuli-responsive functional materials. The innovative water-response double-inverse opal (WRDIO) films, fabricated by introducing polystyrene microspheres into the inverse-opal backbone, exhibit fast response time and brilliant structural color. The deprotonation of carboxyl groups in the inverse-opal backbone enhances hydrophilicity, facilitating water penetration, while high-proportioned carboxylic anions cause rapid swelling of WRDIO film in water. The broad-spectrum shifting of WRDIO film depends on the composition of the ethanol-water mixture, showing potential applications in anti-counterfeiting and sensors.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Materials Science, Multidisciplinary
Zhuohao Zhang, Zhuoyue Chen, Luoran Shang, Yuanjin Zhao
Summary: Natural polymers can be processed into intricate micro/nano-structures with unique photonic features to fabricate artificial structural color materials through different methods. These materials find applications in various fields such as optical display, sensing, anti-counterfeiting, and organ-on-a-chip. The challenges and future research prospects in this remarkable field should be further explored.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Applied
Xiaolin Yu, Wei Ma, Shufen Zhang
Summary: This research focuses on using aqueous-based layer-by-layer dip-coating to prepare hydrophobic polymer-containing 1D PCs with brilliant structural colors. By adjusting the bilayer number, incident angle, and stack number, the structural colors of the heterostructure 1D PCs can be regulated in the visible range. Additionally, the PC film undergoes color change upon exposure to organic solvent vapors, suggesting potential applications in coating, decoration, and sensing.
Article
Crystallography
Giselle Rosetta, John J. Tomes, Mike Butters, Matthew Gunn, Chris E. Finlayson
Summary: This study presents three-dimensional goniometric measurements of structural color from melt-sheared polymer nanoparticle composites, revealing high-angle features resulting from Bragg scattering. The spectroscopic and angular properties of these scattering spots are depicted through 'scattering cones' obtained from full 180 degrees hemispherical scans. The Miller indices of the responsible photonic crystal planes are identified, and observations are made regarding the appearance of scattering in quasi-ordered systems. The report contributes to the understanding of Bragg scattering and structural color in disordered structures, with implications for practical applications in sensing.
Article
Optics
Monika Sheoran, Priyanka Sehrawat, Neelam Kumari, Mukesh Kumar, Hina Dalal, R. K. Malik
Summary: Urea assisted combustion methodology was used to fabricate orthorhombic symmetry type BaGd2ZnO5:Dy3+ nanocrystals with luminance of cool white-color light. The nanocrystals exhibited agglomerated particles with non-uniform shape and crystal-size of 30-40 nm. The quenching phenomenon occurred after the optimized amount of dopant (Dy3+) was examined to be x = 3 mol%. The quenching mechanism was determined to be non-radiative relaxations of energy via exchange-type interrelations, validated by Inokuti-Hirayama (I-H) and Dexter's theory. The fabricated nano-powders had two bands at 492 nm (bluish) and at 581 nm (yellowish), and the optimal powder had a band gap of 4.71 eV, a decay lifetime of 0.7049 ms, and a quantum efficiency of 93.9%. The white-light emanation, represented by the CIE color-parameters, showed congruence with standard coordinates of commercial LEDs and NTSE, demonstrating their potential for advanced illuminating devices.
Article
Materials Science, Multidisciplinary
G. R. Revannasiddappa, R. B. Basavaraj, M. S. Rudresha, G. Nagaraju, Santosh Kumar, N. Sasidhar
Summary: In this study, a series of Dy3+ doped Ca2MgSi2O7 nanopowders were successfully synthesized using a green combustion technique with Aloe vera gel as fuel. The fabricated samples exhibited good phase transparency and a single-phase tetragonal structure. Characterization techniques such as diffuse reflectance spectroscopy, scanning electron microscopy, and photoluminescence analysis provided insights into the energy band gap values, morphological features, and emission peaks, respectively. The results indicated that the synthesized nanopowders have potential applications in cool white light emitting diodes (wLEDs) and forensic studies.
Article
Chemistry, Multidisciplinary
Yuto Arai, Nayuta Yashiro, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: The study demonstrates that introducing NaCl as an electrolyte into liquid emulsions provides a highly thermo-sensitive color-changing ability. The structural color of the emulsions can be controlled from red to blue by tuning the temperature. Furthermore, the C18AA and TOAB concentrations can independently regulate the color and coloring-temperature, so that the desired color can develop at a given temperature.
Article
Chemistry, Applied
Peng Han, Xinyue Li, Bin Zhao, Yuan Li, Huiliang Li, Zheng Wang, Weihua Meng
Summary: Researchers have designed a hierarchical structural-colored film with highly ordered periodic layers and amorphous array layers, which shows excellent optical effects. The highly ordered periodic layers act as a specific wavelength mirror-like reflectance, enhancing the coherent scattering of light in the amorphous arrays and resulting in higher color visibility. The intricate interaction of light over hierarchical structures at different length scales has profound significance for the application of complex optical assemblies.
Article
Nanoscience & Nanotechnology
Yaqun Han, Zhipeng Meng, Yue Wu, Shufen Zhang, Suli Wu
Summary: The new structural colored fabrics achieve vivid noniridescent colors through the scattering of Cu2O single-crystal spheres, with good mechanical stability and tunability, while the color fastness also meets standards, suitable for various external mechanical forces.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Junfei Liang, Tong Wu, Jun Chen
Summary: This study presents white-light polymer light-emitting diodes based on blue polymers PFSO10 and Poly-TPD. By utilizing incomplete energy transfer from blue polymers to low-energy exciplex, a white-light emission based on two high-energy blue polymers was achieved. Through optimizing the blended ratio of PFSO10 and Poly-TPD, a white-light emission with a color rendering index (CRI) of 49 and Commission Internationale de L'Eclairage (CIE) coordinates of (0.38, 0.41) was obtained.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Review
Optics
Pei Zhang, Laurens T. de Haan, Michael G. Debije, Albert P. H. J. Schenning
Summary: Animals can modify their body shape and color for protection, inspiring the development of actuator with color changes. Liquid crystal-based actuators offer a promising approach for achieving structural color changes.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jiashuo Hu, Shuangye Yang, Zihao Chen, Yiping Chen, Jie Wei
Summary: In this study, we developed inverse opal photonic crystals (IOPCs) that can function as real-time identifiable labels by adjusting the structure color and chemical color under UV and NIR light. The IOPCs were prepared by etching a silica photonic crystal template in a thermosensitive hydrogel containing NP. The combination of the green structure color of IOPCs and the red chemical color of the hydrogel resulted in the appearance of yellow color. The structure color of IOPCs changed from green to blue under NIR light, and when simultaneously irradiated by UV and NIR light, the IOPCs appeared purple due to the superimposition of the blue structure color and red chemical color.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Nguyen Thanh Phuong, Nguyen Long Giang, Dang Huu Phuc, Nguyen Ngoc Diem
Summary: Luminescent Mn-doped ZnO nanoparticles and poly(vinyl alcohol) capped Mn-doped ZnO nanocomposite materials were successfully synthesized. The diffraction peaks of Mn-doped ZnO NPs were slightly shifted compared to undoped-ZnO NPs, while the nanocomposite showed a systematic shift of XRD peaks. The luminescent materials exhibited strong fluorescence in the visible wavelength range and near-infrared emission due to XRD peak shift and defect state transitions. These materials have potential applications in light-emitting devices.
Article
Chemistry, Multidisciplinary
Xiaoru Liu, Junfu Liu, Boru Wei, Dongpeng Yang, Li Luo, Dekun Ma, Shaoming Huang
Summary: Inspired by chameleon skins, ZnS-silica photonic crystals with tunable colors are fabricated. They show intense reflectance, wide photonic bandgaps, and large peak areas due to large refractive index contrast and non-close-packing structure. By adjusting particle volume fraction, colors can be easily tuned, and a lower thickness threshold is required for maximal reflectance compared to silica crystals. Various photonic superstructures can be created using the core-shell structure of the particles. A new information encryption technique based on reversible disorder-order switch of water-responsive photonic superstructures is developed. ZnS-silica crystals also enhance fluorescence significantly.
Article
Optics
A. Arellano-Morales, J. Molina-Gonzalez, H. Desirena, J. M. Bujdud-Perez, S. Calixto
Summary: Phosphor-in-doped glass (PiDG) fabricated using CO2 laser heating showed the importance of preserving fluorescent properties during sintering process to avoid opaque samples and achieve transparent PiDGs with high quality. The fast cooling of CO2 laser approach can be applied to create transparent PiDGs suitable for warm white light-emitting diodes (w-LEDs).
JOURNAL OF LUMINESCENCE
(2021)
