phosphorescence
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Introduction
Light emission from relaxation of a triplet excited state to a singlet ground state. Lifetime of the excited state is typically 10E-04 to 10 seconds. Electron energies are split in the excited state with application of a magnetic field. Lifetime of the excited state is prolonged because transition to the ground state is 'forbidden'.
The emitted radiation is of a longer wavelength radiation than that absorbed, continuing after the incident radiation has been removed.
Distinguish from fluorescence.