CBSE - XI Science - Chemistry - Structure of Atom
what are flurocent or phosphorescent materials
However the atoms in some substances have excited energy levels which have longer life times.(longer than 10^-8s). These are known as metastable states . It takes longer to come to the ground state. As a result the substance continues to emit light for a longer time after the removal of the source of the exciting radiation. These are known as Phosphorescent substances.
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