The working principle of the light source mainly includes the following types:
Thermal effect luminescence: This is one of the most common ways of luminescence, such as sunlight and candle light are produced by thermal effect. When an object is heated, the movement of atoms and molecules inside it increases, causing energy to be released in the form of light. The color of this light changes with temperature.
Atomic transition luminescence: This way of luminescence involves changes in the energy levels of electrons inside atoms. For example, the working principles of fluorescent lamps and neon lamps are based on atomic transitions. The fluorescent material in the fluorescent tube emits light after being excited by electromagnetic wave energy, while the neon lamp excites atoms and emits light through gas discharge.
Radioluminescence: This way of luminescence involves the accelerated movement of charged particles inside the substance, such as the light emitted by synchrotron accelerators and atomic furnaces. Synchrotron accelerators produce synchrotron radiation when working, while Cherenkov radiation emitted by atomic furnaces is a special kind of radioluminescence phenomenon.
Classification of light sources and their application areas:
Light sources can be classified according to their working principles and luminescence characteristics. Common light sources include:
Incandescent lamps: Heat is generated by passing an electric current through the filament, causing the filament to glow.
Fluorescent lamps: Use gas discharge and fluorescent substances to emit light.
LED lamps: They emit light through the electroluminescence phenomenon of semiconductor materials, and are characterized by high efficiency and long life.
Application of light sources in scientific research:
In scientific research, light sources such as particle accelerators can produce powerful X-ray, ultraviolet and infrared beams to study the microstructure and dynamic changes of materials. These light sources directly generate light through oscillating magnetic fields, with brightness far exceeding that of ordinary light sources, and can reveal the behavior of materials at microscopic or nanoscale sizes.
