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In this study, we developed a new kind of dual-mode multicolored photonic crystals (PCs), which could be used as a new type of dye, and achieved multicolored patterns. This kind of PCs can exhibit not only distinct structural colors due to Bragg's law of diffraction but also non-structural colors due to fluorescence. We used ultraviolet (UV)-responsive colloidal spheres synthesized by polymerization...
The environmentally friendly pigments based on Pr4+ and Tb4+ doped La2Ce2O7 have been synthesized via the Sol-Gel method and characterized using several analytic techniques, such as XRD, UV–vis–NIR spectrophotometer and CIE L*a*b* (1976) color space. The investigation has demonstrated that the doping of Pr4+ or Tb4+ for Ce4+ in La2Ce2O7 resulted in the color changes from light yellow, soft orange...
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