Introduction to the classification of night pearls
By material "Night Pearl" can be divided into two categories according to the material of the base. 1. Animal and plant "night pearl": There are luminous people in the animal world, such as the famous firefly, which is well known. In the Tang Dynasty, Su Shi's "Du Yang Zai Bian" recorded the first year of the Tang Dynasty Zong Baoli, and Nanchang State offered "Night Ming Rhino". There are many people in the plant world, such as "Compendium of Materia Medica" records "Mu Wei Xi Zhi", "Shen Cheng Zhi", "Seven Ming Jiuguang" in Ganoderma lucidum. 2. Mineral Gemstone Night Pearl: From the perspective of solid physics, the mineral "night pearl" matrix material is an activated crystalline phosphor in inorganic salt crystals. The so-called activated crystalline phosphor refers to the crystal of "lighting" ability due to lattice distortion of the crystal lattice, and this distortion is mostly caused by some heavy metal impurities (activators) contained in the matrix. For example, a small amount of Cu in ZnS can emit yellow-green phosphorescence. This ZnS is called a matrix, and Cu is called an activator. Phosphor The activation of crystalline phosphors, or "night pearls", can be divided into two categories due to the activation of different activators in crystalline phosphors: 1, permanent luminous night pearl: do not need to use any external energy to stimulate, but rely on its own activator, such as 14C. 3H. 147Pm. 226Ra. 232Th. A radioisotope that emits light by itself. 2, long afterglow light storage type night pearl: the activator in the phosphor is not radioactive, it must be excited by the outside sunlight, ultraviolet light and other light sources to shine. There are no less than one hundred kinds of phosphors commonly used today. Their chemical constituents are all compounds of divalent metals (Ca, Sr, Ba, Cd, Mg, Zn) except for alkali metal halides - sulfides, selenides, tellurides. , silicates, aluminates, tungstates, phosphates and halogen phosphates. Among them, silicate and aluminate rare earth light-storing night pearls have been widely used due to the use of new rare earth luminescent materials as the main raw materials, non-toxic, harmless, radiation-free, environmentally friendly and healthy, such as rare earth night pearls, rare earth luminous bouncy balls. (seeking dragon beads) and so on. The natural night pearl is extremely rare and rare. We identify its authenticity. In addition to the identification of scientific instruments in the field of gemstones, it can also be identified based on its many characteristics. Waterproof Fabric,Outdoor Waterproof Fabric,Waterproof Functional Fabrics,Outdoor Waterproof Knit Fabrics Shaoxing Huinan Textile Co., Ltd. , https://www.huinantextile.com