Observations of the Triplet State in Phthalocyanines

摘要

The triplethyphen;state lifetime of metalhyphen;free phthalocyanine has been found to vary from 10minus;6sec at room temperature to 150times;10minus;6sec at 77deg;K. Decay from the first excited state proceeds via the triplet state. Excitation by a gianthyphen;pulse ruby laser completely empties the ground state. Luminescence is quenched in metallic phthalocyanines by the extremely rapid intersystem crossing.