Study On Preparation And Properties Of Blue-light-shielding Coated Glass

In modern life,the use of all kinds of electronic screens and LED light sources adds a lot of brilliance to people’s lives.When a long time watching TV,eye plate,mobile phone screen,people will have a feeling of fatigue and sour.The reason is that there are too many short wave blue light in spectrum.The blue light with wavelengths at 400～450nm has higher energy,and it can penetrate the lens directly to the retina,resulting in atrophy or even death of retinal pigment epithelial cells,leading to macular degeneration,cataract and so on.With the gradual deepening of people’s understanding of blue light,the use of anti blue light products will greatly reduce the risk of disease and improve the quality of life.In this paper,sol-gel method is adopted to prepare different blue-light filter films on the surface of ordinary float glass by means of semiconductor doping and surface plasmon resonance absorption.First,the principle of semiconductor doping is applied.By doping CeOx in titanium oxide thin film to reduce the width of the band gap.The light absorption limit of the film is expected to red-shift to the blue light band,which plays the role of filtering blue light.By testing the blue light barrier rate of the film,It is found that the cut-off of blue light is very limited by Ce doped titanium oxide film.The red shift of the absorption edge of the film is not obvious.And because of the high refractive index of titanium oxide,a portion of the visible light will be reflected and the transmittance decreases.Therefore,this paper focuses on the study of another kind of filter film prepared by the principle of surface plasmon resonance absorption.Based on the principle of surface plasmon resonance,a thin film loaded with silver nanoparticles was prepared,and the cut-off of short wave blue light was achieved.At the same time,a thin layer of ZnO film was added to achieve the cut-off of near ultraviolet.The properties of the films were controlled by different sol proportions,heat treatment temperature adjustment and UV irradiation reduction,and a more optimized preparation process was obtained.It is found that the Ag/SiO2 film prepared by the plasma resonance absorption principle based on the tin surface of float glass has strong absorption to short wave blue light.It is found that Sn2+ can reduce Ag+ to Ag monomer in the tin rich surface of float glass.With the increase of heat treatment temperature,more silver nanoparticles were formed,and the particle size also increased.Meanwhile,the SiO2 film became denser,resulting in the blue light absorption peak broadening and the red shift of the peak position,resulting in strong blue light absorption.With the increase of the thickness of the film.The ZnO film had a better cut-off on the near ultraviolet,the ultraviolet cut-off effect can reach 98%.It is found that the Ag/SiO2 film can be prepared on pure quartz glass surface or non tin surface of float glass by UV irradiation.The method does not need the tin rich surface to restore,and it does not need to add heat reducing agent to the sol.The size of silver nanoparticles is smaller and the distribution is more concentrated.The thermal reduction and UV irradiated samples with the same cut-off rate are compared,the latter sample’s yellow degree is lighter.It is considered that the size of silver nanoparticles in the films prepared by thermal reduction method is larger,and larger nanoparticles can scatter the blue light in larger wavelength range,so the yellow degree is deeper.Taking one of the Ag/SiO2 film samples as an example,the blue light cut-off rate is 66.3%,the 450～780 nm visible light transmittance is 85.62%,and the microhardness can reach 556 HV.After a variety of tests,the film has no shedding,crack,orifice,and so on.The transmittance is within the allowable range,and it has excellent weatherability.