With the development of experimental techniques, effective injection and transportation of electrons is proven as a way to obtain polymer light-emitting diodes (PLEDs) with high quantum efficiency. This paper reveals a valid mechanism for the enhancement of quantum efficiency in PLEDs. When an external electric field is applied, the interaction between a negative polaron and triplet exciton leads to an electronic two-transition process, which induces the exciton to emit light and thus improve the emission efficiency of PLEDs.
George, Thomas; Chen, R.-A.; Wang, C.; and Li, S., "Electronic Two-transition-induced Enhancement of Emission Efficiency in Polymer Light-emitting Diodes" (2013). Chemistry & Biochemistry Faculty Works. 27.