Preparation and Performance Study of Long Afterglow Luminous Signs Wang Xiaochun Liu Quansheng Zhang Xiyan Jiang Weiwei Tian Xueyan Hu Jie (School of Materials and Chemical Engineering, Changchun University of Science and Technology, Changchun Cursor. In addition to SAO4:Eu2++Dy3+, the luminous brightness is high. The performance of long afterglow time, It also has water and moisture resistance and easy cleaning performance; the excitation spectrum shows that ultraviolet and visible light can be effectively excited, and the emission spectrum shows that the emission peak is located near 520 lm, which is dazzling yellow-green. Fund Project: The Ministry of Education focuses on the five-layered luminous signs, which are 1 substrate, 2 primers, 3 reflective layers, 4 luminescent layers, and 5 protective layers. Release, add appropriate amount of dispersant, slowly stir, gradually add luminescent powder, stir at high speed, and finally add various additives (anti-settling agent, anti-UV agent, etc.) and stir at high speed for half an hour. 1-2 Preparation of the illuminating sign substrate: 0.8mm thick aluminum alloy plate is used, and it is cut into the sign substrate according to the required size (for example, 150X400mm), and mechanically polished with different fineness of sandpaper, and then used The weakly alkaline solution is subjected to surface oxidation treatment. The production of the sign: first apply a layer of dark blue primer, after the primer is dried; use a masking technique to apply a layer of white reflective layer on the primer; after drying, use the same method as the previous step The schematic structure of the light-emitting sign to be provided is the basis of the light-emitting sign, and the processing of the substrate is related to the quality and durability of the light-emitting sign. The substrate can be processed in a variety of ways, but it must be solid, flat, clean, and dry regardless of the method used. The role of the primer is to protect the substrate, while the contrast between the color of the primer and the luminescent paint can make the illuminating sign more eye-catching. Therefore, for the yellow-green light emitted by the SrU4Eu2+Dy3+, the illuminating sign uses a dark blue primer. The reflective layer uses a white coating that has a strong reflection effect on visible light of various colors. The luminescent layer is a key part of the illuminating signage, which absorbs ultraviolet and visible light and emits green light that is sensitive to the human eye. The protective layer not only protects the primer and the luminescent layer, but also has a high brightness. 2.2 The effect of the reflective layer on the brightness of the light is the same process and formula. The two light-emitting cards are respectively recorded as 12, one of which is a light-emitting card coated with a reflective layer, and the other is a light-emitting sign without a reflective layer. The same result was obtained on the luminescence spectrum of the 1 wrestling 2 sample with the naked eye, and the luminous intensity of the li-illuminated sign was almost twice that of 2 lux. An illuminating sign coated with a reflective layer (1 and an illuminating sign of the uncoated layer (2) is given. 2. Effect of thickness of luminescent layer on luminescence brightness and afterglow time The samples with the same thickness of 0.1mm, 0.2mm and 0 brand 12345 were prepared with the same proportion of coating. The illuminance and duration of the luminescent layer are shown in the following table. As can be seen from the table, the thicker the coating, the higher the luminance and the longer the duration. Table brightness. The duration of the relationship with the thickness of the luminescent layer is lower than that of the sample. The emission spectrum of the excitation spectrum of the illuminating sign is shorter than that of the short duration. The figure shows that the broad spectrum of the excitation spectrum between 240nm and 480nn, indicating that the short-wave of the ultraviolet and visible light -480nm can effectively stimulate the illuminating sign. Therefore, the SiAi4:Eu2+Dy3+ illuminating sign emits bright green light after being exposed to natural light. 2. The luminescence spectrum of the luminescent spectrum card of the illuminating sign, it can be seen that the emission spectrum of SrU4:Eu2+, Dy3+ is the broadband spectrum with the peak at 520nm, which is caused by the transition of the 4f5d configuration of Eu2+ to the ground state 4f. The luminescent color of the material is similar to that of the human eye, and it has excellent properties as a luminous material. The afterglow attenuation curve of the 2-6 cursor was not observed in the excitation spectrum and the luminescence spectrum. The figure is that after 20 ninth illumination with ordinary 2CW fluorescent lamp, the power is turned off, and the brightness of the sample is measured with time by using a 1980A surface luminance meter in a dark room. After the initial illumination of the illuminating sign is 10 tain, the illuminance is 0.23 cd/m2. During this time, the luminescence decays very quickly, and the brightness decays slowly afterwards. By 10h, the illuminance is 2.62mcd/m2, which is higher than the lowest brightness value (0.32mcdm2) arguable by the human eye. Since the late decay is very slow, in the dark field environment, the human eye can still recognize its luminescence after 10 hours. This shows that the luminescence decay of the SrU4:Eu2+Dy3+ illuminating sign is an extremely long process. 3 Conclusion The excitation spectrum of the illuminating sign is between 240nm and 480nm, indicating that both the ultraviolet and visible short-wavelength portions (400nm-480nm) can effectively excite the illuminating sign. The emission spectrum of the illuminated signage is a broadband spectrum with a peak at 520 nm, which emits green light that is sensitive to the human eye. The illuminating sign has a high illuminance and a long afterglow time. (4 Splash brightness and afterglow time increase with the thickness of the coating. (5) The brightness of the sign coated with the reflective layer will be significantly improved.
Polar Fleece Fabric is a soft insulating synthetic wool fabric made from PET or other synthetic fibers. One of the first forms was Polar Fleece created in 1979 by Malden Mills, a new, light and strong pile fabric meant to mimic and in some ways surpass wool. Fleece has some of wool`s finest qualities but weighs a fraction of the lightest available woolens.
Fleece fabric , as it is light, warm, plushy, soft touch, easy to wash, and most of all, cheap, is very popular in our household productions. Polester fleece has a lot of various styles due to the different weaving, technology, artwork, finish processing... it can be vaious and unique as per customers requests. Fleece blankets are most preferable due to its multi-purpose usage for bedding, snap, sofa, travel and babies use, pets use. We manufacture popular fleece fabric including Coral Fleece Blanket, Flannel Fleece Blanket, Polar Fleece Blanket, velveteen Fleece Blanket , and other home textiles etc- According to the seasons and weather, the size and the weight of our blankets differ accordingly. Customers' OEM designs and patterns are strictly protected, with us, your products are of good quality and under guaranteed.
Material Polar Fleece,Polar Fleece Material,Brushed Fleece Fabric,Polyester Polar Fleece SHAOXING BOLIHAO HOME TEXTILES CO.,LTD , https://www.bolihao.com