The Principle of Noctilucent Effect of TPU Leather

Thermoplastic polyurethane (TPU) is a special polymer material that can emit light under specific conditions, known as the fluorescent effect.

The noctilucent effect of TPU is primarily based on the addition of luminescent particles. These luminescent particles are typically fluorescent powders or fluorescent dyes. When exposed to light, the electrons within these particles are excited to a higher energy level, forming an excited state. When the external light source stops shining, these excited state electrons gradually return to the ground state and release photons through non-radiative transitions, producing the luminescent effect. In dark environments with dim lighting, the human eye is more sensitive to the faint light emitted by luminescent materials, allowing the noctilucent effect to be visible.

This luminescence is not continuous but diminishes gradually over time until it disappears completely. The noctilucent duration of glow-in-the-dark materials is generally short, requiring exposure to light again for a period of time to recharge and restore the noctilucent effect.

The duration and intensity of this noctilucent effect depend on several factors, including the quality and concentration of fluorescent particles, the intensity and duration of the light source, etc. Therefore, by controlling these factors, the duration and intensity of the noctilucent effect of TPU materials can be adjusted.