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Luminescence facts for kids

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Luminol
Luminol and haemoglobin, an example of chemiluminescence

Luminescence is light emitted by a substance not caused by heat. In contrast, incandescence is light emitted by a substance as a result of heating.

Luminescence can be caused by chemical reactions, electrical energy, subatomic motions, or piezoelectricity (stress on a crystal). The term 'luminescence' was introduced in 1888 by Eilhard Wiedemann.

The dials, hands, scales and signs of aviation and navigational instruments and markings are often coated with luminescent materials in a process known as 'luminising'.

Some types of luminescence

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