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The light‐emitting electrochemical cell (LEC) is fundamentally dependent on mobile ions for its operation. In polymer LECs, the mobile ions are commonly provided by dissolving a salt in an ion transporter, with the latter almost invariably being an ether‐based compound. Here, the synthesis, characterization, and application of a new class of carbonate‐based ion transporters are reported. A polymer LEC, comprising a star‐branched oligocarbonate endowed with aliphatic side groups as the ion transporter, features a current efficacy of 13.8 cd A⁻¹ at a luminance of 1060 cd m⁻², which is a record‐high efficiency/luminance combination for a singlet‐emitting LEC. It is further established that the design principles of a high‐performance carbonate ion transporter constitute the selection of an oligomeric structure over a corresponding polymeric structure and the endowment of the oligomer with functional side chains to …