Abstract
An effective approach to realize high-efficiency exciplex-based organic light-emitting diodes (OLEDs) is proposed by employing long-range coupling between electron-hole pairs and efficient energy transfer. The space-separated holes and electrons form exciplexes through charge-transfer states, and devices with such structures can reduce exciton quenching in a certain extent compared to those based on interfacial exciplexes. Remarkable external quantum efficiency about 12.6% is achieved by introducing a yellow exciplex system in a donor/spacer/acceptor structure because of the suppression of exciton quenching and the efficient energy transfer. Such a unique strategy is beneficial to better utilizing the triplet excitons and thus achieving high performance exciplex-based OLEDs.
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