Views: 0 Author: Site Editor Publish Time: 09-12-2021 Origin: Site
Do you know anything about photoluminescent tapes? I think you can already understand luminescence, but there is some confusion about what photoluminescence is. The following is an introduction to how photoluminescent tapes emit light.
Here is the content list:
1. What are photoluminescent tapes?
2. What is the principle of luminescence of photoluminescent tape?
3. How are photoluminescent tapes classified?
Photoluminescent tapes are the phenomenon that an object depends on an external light source for irradiation, thus gaining energy and producing excitation leading to luminescence, which roughly passes through three main stages: absorption, energy transfer, and light emission. And energy transfer is due to the motion of the excited state. Ultraviolet radiation, visible light, and infrared radiation can all cause photoluminescence. Such as phosphorescence and fluorescence.
Photoluminescent tapes are coated with fluorescent material, and its luminescence principle has two: one is the use of natural minerals that can store light, in the case of external light, to absorb part of the light energy, it will be stored. When the outside world is dark, it will store part of the light energy naturally released, thus producing a luminous effect. The other is the use of non-woven fabric as raw material, after the purple light irradiation, to produce a luminous effect, due to the need to use the purple light as a tool.
The absorption and emission of light both occur in the process of jumping between energy levels, both experience excited states, and energy transfer is due to the motion of the excited state. The energy of the exciting light radiation may be absorbed directly by the luminescent center (activator or impurity) or may be absorbed by the matrix of the luminescent material. In the first case, the luminescent center absorbs energy to higher energy levels and subsequently jumps back to a lower energy level or ground state energy level to produce luminescence. In the second case, the matrix absorbs light energy, the formation of the electron a hole pair in the matrix, they may move in the crystal, is bound to the luminescent center, luminescence is due to the compound of the electron a hole and caused. When the luminescent center ion is in the energy band of the matrix, it will form a local energy level, in the matrix between the conduction band and valence band, that is, located in the forbidden band of the matrix. For different substrate structures, the position of the local energy level formed in the forbidden band of the luminescent center ion is different, and thus under light excitation, will produce different jumps, resulting in different luminescent colors. Photoluminescent tapes are divided into luminescent bands for fluorescent lamps, luminescent bands for plasma display panels (PDP), long afterglow luminescent bands, and upconversion luminescent bands.
Through the above concept of photoluminescent tapes, luminescence principle, and the type of classification according to the luminescence principle, we should have a certain understanding of how photoluminescent tapes is luminescence. If you want to choose photoluminescent tapes that meet the needs of your own, then you can consider the products of Wenzhou Xiangying Reflective Material Science＆Technology Co., Ltd.