All kinds of photoluminescent signs are available, aluminium base, plastic base, steel & iron base, etc.
They, glow in the dark place, were known as the lives' light in the 9-11 tragic accident in World Trade Center. Many people were lead to safety from the accident as the lamp lights were off for the absence of power.
The photoluminescent signs can be used in building as wall stickers etc.
Advantage: 1. Easy to use
2. Short charge and then high luminance &long luminous duration 15mins charging by visible light, and it will continuously glow for 12+hours.
3. No need of electric power, needless of maintenance