Subject singlet oxygen molecule

Molecules in electronic excited states are highly reactive. The presence of any dissolved oxygen or impurities makes it possible for the excited species to react with oxygen or the impurities, or to dimerize this decreases the probability of electronic transitions to the ground state. Note that fluorescence and phosphorescence are both radioactive decay processes, therefore they are both subject to the sarnie influences the differences that would exist would be the differences in reactions and reactivity of singlet vs. triplet states. 

---