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The hump behavior of current efficiency in OLEDs(Organic Light Emitting Diodes) were often observed at the low voltage under certain charge balance condition. The color non‐linearity with image sticking in the low voltage level was found to be well correlated with the existence of hump phenomena. In this paper, we explained the mechanism of hump is trade‐off between Langevin recombination and SRH(Schokley‐Reed‐Hall)...