Organic light emitting diodes (OLEDs) typically exhibit low quantum efficiencies (~ 19%) due to quantum mechanical limitations and spin statistics. In traditional OLEDs, the emitting excitons are either singlet (25%) or triplet (75%) spin states. Because decay from triplet states is spin forbidden, the internal quantum efficiency of fluorescent devices is limited to a theoretical maximum of 25%. To circumvent this problem, modern OLEDs rely on triplet, phosphorescent emitters, that require the incorporation of often expensive heavy atoms to facilitate intersystem crossing between the singlet and triplet excited states, thus increasing triplet emission. In contrast to the widely explored triplet emitters, this presentation will describe our recent efforts to prepare cationic and neutral doublet emitters derived from carbenes and triarylmethyl- or triarylboryl-centered radicals, respectively. In principle, doublet emitters have theoretical quantum efficiencies of up to 100%, making them ideal candidates for next-generation light-emitting devices.

Doublet emitters derived from stable carbenes for potential OLED applications

256th National Meeting (2018)

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