The delayed luminescence consists in the prolonged in time and ultra-weak emission of optical photons by a system after the light source is turned off. The overall intensity of the DL is 103÷105 times less than that of the fluorescence and it is

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Most of the biological systems and most of materials emit, on being illuminated optical photons characterized by an ultraweak intensity and relatively long duration. This photo induced ultraweak luminescence is often called delayed luminescence

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