The glowing of watch dials in the dark typically occurs through a process called “luminescence.” In this process, certain materials absorb light and then emit it in the dark. Here are some common methods used to achieve this glow:
Photoluminescence
In this method, watch dials absorb light during the day and then glow in the dark by releasing that stored energy. Materials like Luminova and Super-Luminova operate on this principle. These materials contain phosphors like strontium aluminate, which absorb sunlight and store energy.
Chemical Reactions
Some watches can glow in the dark through chemical reactions. These watches generally provide short-term illumination and are often used for emergency situations.
Radioactive Substances
In the past, radioactive materials were used in watch dials. These materials emitted a constant low level of light, causing the dials to glow in the dark. However, after it was discovered that radium was hazardous to health, safer alternatives like tritium and promethium were introduced.
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