This work presents a method for the synthesis of a liquid-like polythiophene (L-Pth) by chemical oxidative polymerization of thiophene in dichloromethane. FeCl 3 was used as an initiator and nonylphenol polyoxyethylene ether (NPES) as a dopant . The structures and physicochemical properties of the L-Pth were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), fluorescence spectroscopy and ultraviolet-visible photometer (UV–vis). Unlike conventional polythiophene, L-Pth is composed of NPES and polythiophene, and part of NPES is doped on the thiophene backbone. It exhibits a liquid-like behavior at room temperature. It is typical of a semiconductor with a relatively high electric conductivity of 1.2 S m −1 . Moreover, it turns high-energy blue light (in the ranges of 400–480 nm) into relative low-energy green light (peak at 515 nm), which makes it a potential filler for preparing a blue light protection film for eyes protection. The combination of the liquid behavior, excellent solubility and good electric conductivity also makes it a promising precursor for applications such as lightweight battery, super capacitor and anti-corrosion of metals.
Longchuang Li,Yuan Li,Tao Zhang,Yan Li,Zijian Li,Hong Bi
High-energy blue light is highly detrimental to health as it can penetrate the lens into the retina, potentially causing atrophy or even death of retinal pigment epithelial cells. To prevent the harmful effects of high-energy blue light on our health, here the preparation of a photoconversion film specifically designed to block high-energy blue light is reported, which is composed of green-emissive carbon dots (G-CDs) with a high photoluminescence quantum yield (PLQY = 95%) dispersed in polyvinyl alcohol (PVA) matrix. Notably, such a film (named as G-CDs@PVA) not only converts an incident laser light with a short wavelength into a fluorescence with a longer wavelength, but also exhibits concentration-dependent (0, 10, 20, and 30 wt.%) blue light barrier rate and green-emissive intensity. With the increase of the concentration of G-CDs in the film, the blue light barrier rate of the film as well as the maximum intensity of the green emission are also increased. When the concentration of G-CDs reaches 30 wt.%, the blue light barrier rate of G-CDs@PVA achieves up to 97%. Furthermore, G-CDs@PVA film is attached to a blue light-emitting diode (LED) chip to explore its practical application in the field of blocking blue light damage.
A UV-curable coating with UV and blue light protection was prepared by incorporating modified rare earth nano cerium dioxide (CeO2) treated with the silane coupling agent KH570. The structures of the modified CeO2 and the resulting UV-curable coating were characterized using Fourier Transform Infrared Spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. UV spectral analysis was conducted to evaluate the UV shielding performance of the coating. The results demonstrated that the nano-CeO2 was uniformly distributed within the polymer matrix of the cured coating. The coating exhibited UV shielding capabilities ranging from 58% to 98% in the UVB region (280–315 nm), as well as effective protection against blue light (400–450 nm), and the visible light transmittance is maintained at about 90%. The UV-cured coating also displayed excellent mechanical properties, indicating its potential application in electronic products.
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