A color-tunable OLED device comprising: a charge-carrying cathode layer and a charge-carrying anode layer disposed parallel to each other; at least a first organic light-emitting unit and a second organic light-emitting unit disposed between the cathode and anode; and at least one charge-generating layer disposed between the cathode and anode, wherein the charge-generating layer is a charge-carrying layer of lesser lateral conductivity than the anode and cathode, and said charge-generating layer is electrically connected without additional circuit elements to another charge-carrying layer and disposed such that at least one organic light-emitting unit is wedged between two directly-connected charge-carrying layers, and at least one organic light-emitting unit is not thusly wedged.
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