Figure 7.

Schematic energy level diagram of the formation of electronically excited species through the decomposition of ROOR and ROOOOR. The decomposition of ROOR occurs via a transition state (reaction 1). The decomposition of the transition state of ROOR generates ³R=O^* (reaction 2). The decomposition of ROOOOR to ³R=O^* (reaction 3). The electronic transition from the triplet energy level of ³R=O^* to the ground state is accompanied by light emission (reaction 4). The triplet-singlet energy transfer from ³R=O^* to ¹C^* (reaction 5). The triplet-triplet energy transfer from ³R=O^* to chromophore ³C^* (reaction 6). Intersystem crossing from ¹C^* to ³C^* (reaction 6). The reverse intersystem crossing converts ³C^* to ¹C^* (reaction 8). The electronic transition from ¹C^* and ³C^* to the ground state is accompanied by photon emission (reaction 9,10). The decomposition of ROOOOR generates singlet oxygen (¹Δ_g) (reaction 11). The triplet-singlet energy transfer from ³R=O^* to molecular oxygen is feasible (reaction 12). The electronic transition from the energy level of singlet oxygen (¹Δ_g) to the triplet energy level of ground state is accompanied by dimol (reaction 14) and monomol photon emission (reaction 15).