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The performance of the Cd‐free quantum‐dot light emitting diode (QLED) was investigated by mixing the hole and electron transport materials with the emission layer. With an optimized mixing ratio of the hole transport and electron transport materials, the current efficiency of 4.2 cd/A and EQE of 2.2% was achieved using the ZnCuInS/ZnS‐based QLED at yellow emission. Additionally, after optimizing...