The singlet exciton yield in light emitting polymers

Bimolecular electron transfer is an important mechanism in determining the singlet exciton yield in light emitting polymers, as discussed in the next section. 

6 The singlet exciton yield in light emitting polymers 9.6.1 Introduction 

The electroluminescence quantum efficiency, /el, of a light emitting device is defined as, 

Since electrons and holes are ejected into the device with random spin orientations, there are initially three times as many triplet electron-hole pairs as 

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Finally, we remark that this chapter has focussed on excitons confined to single chains. However, the formalism can easily be extended to interacting chains, and this will be considered briefly in Section 9.6 when we describe a theory for the singlet exciton yield in light emitting polymers. 

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