Häviöhehkun
Häviöhehkun is a Finnish term that translates roughly to "loss glow" or "fading luminescence." It describes a phenomenon observed in certain materials, particularly phosphors, where the emitted light gradually diminishes after being excited by an energy source. This gradual decay of luminescence is a characteristic property of materials that exhibit phosphorescence, a type of photoluminescence.
The process of häviöhehkun involves the absorption of energy, typically from ultraviolet light, which excites electrons
Factors influencing häviöhehkun include the chemical composition of the material, its crystal structure, and ambient temperature.