The technology is based on oxygen-dependent phosphorescence of organic molecules.
Phosphorescence occurs when materials continue to Shine, after they were previously irradiated with light.
A well-known example is the shining star, which often go to the children's room ceilings. This afterglow can last from seconds to several hours.
In PRUUVE the duration is only 0.1 seconds. Therefore, it is often a confusion: Physically, it is phosphorescence, but this is visible to the naked eye due to the short Afterglow only during the UV-irradiation of visible.
Phosphorescence may not occur when free oxygen (O2) in the vicinity of our emitter molecules. Free oxygen is, however, already by the manufacturing process in the layer system.
In the case of UV-irradiation is now transferred the energy to the oxygen, instead of the emitter molecules. The oxygen is reactive and builds up in the polymer environment. In the case of continuous UV-irradiation of the oxygen gradually disappears. Only when the oxygen is completely removed, the phosphorescence visible.
The time until the phosphorescence is visible, we refer to as the "activation time". This activation time is used as a measure of the radiated UV-dose and allows precise UV-dose measurements. We can make the activation time due to adjustments in the recipe, flexible to meet all industrial requirements.
The measuring device is irradiated, the strip with UV-radiation and measures the time until the phosphorescence uses. Based on the calibration measurement and the measurement after the UV-irradiation of the UV is calculated dose value and the customer is displayed.
