| OSCs | Organic solar cells |
| OLEDs | Organic light-emitting diodes |
| FETs | Field effect transistors |
| ΔEL-L | Downhill energetic driving force |
| DPP | Diketopyrrolopyrrole |
| ICT | Intramolecular charge transfer |
| DFT | Density function theory |
| TD-DFT | Time dependent density function theory |
| FMOs | Frontier molecular orbital energies |
| HOMO | Highest occupied molecular orbital |
| LUMO | Lowest unoccupied molecular orbital |