The earlier self-luminous materials can be traced back to the radium element discovered by Mrs. Curie. It is called the first generation of self-luminous materials and has certain radiation; the second generation of self-luminous materials, namely traditional sulfide fluorescent materials, Due to its toxic, radioactive, and low brightness and short duration, the application field is limited. The third-generation light-storing self-luminous materials were produced in the 1990s. Compared with the previous two generations, this material has significant advantages such as non-toxicity and non-radioactivity. At present, the luminescent materials produced are mainly classified into two types: self-luminous type and light-storing type. The basic component of the self-luminous luminescent material is a radioactive material, and does not need to absorb energy from the outside, and can continuously emit light in the dark or in the daytime. However, because it contains radioactive substances and does not meet the requirements of environmental protection, it is greatly restricted in use, and the disposal after disposal is also a major problem; the luminescent materials are mainly zinc sulfide luminescent materials and rare earths that have developed rapidly in recent years. Aluminate series of luminescent materials. Rare earth aluminate luminescent materials have the advantages of long luminescence time, high brightness, non-toxic, harmless, non-radioactive, and stable chemical properties, and their luminescent properties are significantly better than zinc sulphide. In terms of molecular structure, rare earth elements have abundant electronic energy levels and can generate transitions between various energy levels. When visible light illuminates rare earth ions, electrons transition from the ground state or the lower energy level to the upper energy level, and light absorption occurs. Light energy is stored in the fiber. In the absence of visible light, electrons transition from the upper level to the lower level or the ground state, producing light emission that releases the energy stored in the fiber. Different colors of light can be emitted due to the difference in energy between the energy levels of the rare earth ions. The ternary color (red, yellow, blue) color light is combined in a certain way by the principle of light color synthesis, thereby forming a rich and colorful effect. The “Rare Earth Luminous Fiber†scientific research project jointly developed by Wuxi Hongyuan Chemical Fiber Experimental Factory and Jiangnan University has passed the scientific and technological achievements appraisal organized by Jiangsu Science and Technology Department and the new product appraisal organized by Jiangsu Provincial Economic and Trade Commission. The product has successfully developed color rare earth luminous fiber using high-tech and nano-scale technology. It has various colors such as red, yellow, blue and green. The color is colorful and colorful, and no dyeing is needed to avoid environmental pollution. Rare Earth Luminous Fiber is a new type of high-tech functional fiber. As long as it absorbs any visible light for 10 minutes, it can store light energy in the fiber, continuously emit light for more than 10 hours in a dark environment and can be recycled indefinitely.
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