Photophysical Processes— The Jablonski Diagram

The primary photophysical processes occuring in a conjugated molecule can be represented most easily in the Jablonski diagram (Fig. 1). Absorption of a photon by the singlet state So produces an excited singlet state S . In condensed media a very fast relaxation occurs and within several picoseconds the first excited singlet state Si is reached, having a thermal population of its vibrational levels. The radiative lifetime of Si is in the order of nanoseconds. Three main routes are open for deactivation ... 

The various unimolecular photophysical processes may be envisaged in a rather illuminating way with the help of the Jablonski diagram shown in Fig-... 

In the rest of this work, individual photophysical processes ensuing photon absorption will be discussed, following the generalized Jablonski diagram shown in Fig. 2. 

Figure 12.1 Modified Jablonski diagram showing photophysical processes that can occur following absorption of a photon of light by a drug molecule. S0 is the ground state S, and S2 are excited singlet states and T, T2, and T3 are excited triplet states.

Scheme 52, in an extended Jablonski diagram, summarizes photophysical and photochemical processes that in the case study of ort/io-quinol acetates have been observed. 

Figure 4.1 Jablonski diagram of the important unimolecular photophysical processes of excitation energy dissipation absorption (A), fluorescence (F), phosphorescence (P), internal conversion (IC), intersystem crossing (ISC), vibrational relaxation (VR). Sq is the singlet ground state, Sj and S2 are excited singlet states and Tj is the excited...

O Figure 14-1 contains a simplified Jablonski diagram summarizing the main photophysical and photochemical effects undergone by a molecular system. It is common to reserve the word photophysics to processes not involving the generation of new photospecies, that is, just... 

Jablonski s diagram, lifetimes of the basic photophysical processes and deexcitation pathways from the lowest-lying excited states of a molecule... 

State energy diagrams of this type, called Jablonski diagrams , are used for the description of light absorption and of the photophysical processes that follow light excitation (vide infra) [1]. 

---