Super-LumiNova

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Europium doped strontium silicate-aluminate oxide powder under visible light, long-wave UV light, and in total darkness.

Lume applied on a diver’s watch to make it readable in low light conditions.

Super-LumiNova is a brand name under which strontium aluminate based non-radioactive and non-toxic photolumnescent or afterglow pigments for illuminating markings on watch dials, hands and bezels, etc. in the dark are marketed. This technology offers up to 10 times better brightness than previous zinc sulphide based materials.

Besides for timepieces Super-LumiNova is also marketed for application on:

Instruments: scales, dials, markings, indicators etc.
Scales: engravings, silkscreen-printing
Aviation instruments and markings
Jewellery
Safety- and emergency-panels, signs, markings
Aiming posts and
Various other parts

This type of phosphorescent pigments, often called lume, operate like a light battery. After sufficient activation by sunlight or artificial light, they glow in the dark for hours. Larger markings are visible for the whole night. This activation and subsequent light emission process can be repeated again and again, and the material does not suffer any practical aging. Strontium aluminate based pigments have to be protected against coming into contact with water or moisture, since this degrades the light emitting quality^[1]^[2]^[3].

[edit] Alternative for afterglow pigments

Tritium based devices called "gaseous tritium light source" (GTLS), that are an alternative for afterglow pigments, have the advantage of being self-powered and producing a consistent luminosity that does not fade during the night.