Photoluminescence (Photoluminescence, PL for short) refers to the process of re-radiating photons (or electromagnetic waves) after substances absorb photons (or electromagnetic waves). From the theory of quantum mechanics, this process can be described as a process in which a material absorbs a photon and then transitions to an excited state at a higher energy level, and then returns to a lower energy state, while emitting a photon. Photoluminescence is one of many forms of fluorescence (Fluorescence). Photoluminescence spectroscopy is a method of detecting the electronic structure of a material, it has no contact with the material and does not damage the material. Light is directly irradiated onto the material, absorbed by the material and transferring excess energy to the material. This process is called light excitation. This excess energy can be consumed in the form of light. The process of emitting light due to light excitation is called photoluminescence. The spectral structure and light intensity of photoluminescence are the direct means of measuring many important materials. Light excitation causes the electrons inside the material to transition to the allowed excited state. When these electrons return to their thermal equilibrium, excess energy can be released through the process of light emission and non-radiation. The energy of photoluminescence radiation is related to the difference in energy level between the two electronic states, which involves the transition between the excited state and the equilibrium state. The amount of excitation light is related to the contribution of the radiation process. Photoluminescence spectroscopy can be applied to: band gap detection, impurity level and defect detection, composite mechanism and material quality identification. Why use photoluminescence? The experimental equipment of the photoluminescence analysis method is relatively simple, the measurement itself is non-destructive, and there are no special requirements on the size, shape and parallelism of the sample surface. Marble Chopping Board,Cutting Board,Wheat-Straw Cutting Boards,Chopping Board Yangjiang Yado Kitchen Industry Co., Ltd. , https://www.yadokitchen.com
Why use photoluminescence for testing?