https://doi.org/10.1351/goldbook.J03360
Originally, a diagram showing that the fluorescent state of a @M03986@ is the lowest @E02257@ from which the transition to the @G02704@ is allowed, whereas the phosphorescent state is a @M03872@ state below the fluorescent state, which is reached by @R05057@. In the most typical cases the fluorescent state is the lowest singlet @E02257@ and the phosphorescent state the lowest @T06503@, the @G02704@ being a singlet. Presently, modified Jablonski diagrams are frequently used and are actually state diagrams in which molecular electronic states, represented by horizontal lines displaced vertically to indicate relative energies, are grouped according to multiplicity into horizontally displaced columns. @E02248@ and @R05285@ processes that interconvert states are indicated in the diagram by arrows. Radiative transitions are generally indicated with straight arrows (→), while radiationless transitions are generally indicated with wavy arrows ⇝.