 Solution

ID: past-exam-of-the-chemistry-course-of-the-year-3-of-the-natural-sciences-course-of-the-university-of-cambridge/2021/paper-2a/section-b/22/b/i/solution

The phosphorescence quantum yield is the number of phosphorescence photons emitted per photon absorbed. In rate form,

ϕ_{P} = \frac{rate of phosphorescence photon emission}{rate of photon absorption} = \frac{k _{P} [ T _{1} ]}{I _{abs}} .

It is dimensionless. The denominator counts absorbed photons, not incident photons or the instantaneous triplet population.

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