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The effect of the cathode work‐function on the performance of colloidal quantum‐dot light‐emitting diodes (QD‐LEDs) is investigated in this work. In typical QD‐LEDs, electron injection is more efficient than the hole‐injection. The imbalance of carrier injection leads to a low device performance because the excess electrons, either charging the QDs and consequently enhancing the nonradiative Auger...
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