发光——在一定温度下超出热辐射,又有比光的振动周期更长的发光期间的那一部分辐射。它是物体的有选择性的本征发光。发光学的研究对象是光的产生、光的性质、光同物质的相互作用等基本问题,它对了解光的本质和物质的特性都有十分重要的意义。 具有发光本领的材料类别甚多,很多无机物和有机物都可发光,而且有气态,液态及固态等不同形式。仅就固体发光材料而言,又有晶态和非晶态之分。还可有粉末,薄膜及单晶等不同结构。它们有的是绝缘 Luminescence - The portion of radiation that goes beyond thermal radiation at a certain temperature and has a longer duration than the vibrational period of light. It is a selective emissive feature of the object. The object of luminescence research is the light production, the nature of light, the interaction between light and matter and other basic issues, it is very important for understanding the nature of light and the characteristics of matter. There are many types of materials with the ability to light, many inorganic and organic matter can be light, and there are different forms of gaseous, liquid and solid state. Only for solid light-emitting materials, there are crystalline and amorphous points. There are also different structures of powder, film and single crystal. Some of them are insulated