Final answer:
Fast internal conversion can be desirable in certain materials or molecules. For example, in fluorescent dyes used in imaging techniques, it allows for efficient energy dissipation and prevents photodegradation. In organic semiconductors used in solar cells, it helps to reduce non-radiative losses and improve device efficiency.
Step-by-step explanation:
Fast internal conversion
refers to the process in which a molecule undergoes a non-radiative transition from an electronically excited state to a lower energy state. In some cases, fast internal conversion can be desirable in certain materials or molecules.
For example, in fluorescent dyes used in imaging techniques, fast internal conversion allows for efficient energy dissipation and prevents photodegradation. Additionally, in certain organic semiconductors used in solar cells, fast internal conversion helps to reduce non-radiative losses and improve device efficiency.