Boosting External Quantum Efficiency of Blue Perovskite QLEDs Exceeding 23% by Trifluoroacetate Passivation and Mixed Hole Transportation Design

Abstract Perovskite quantum dot‐based light‐emitting diodes (QLEDs) have been considered a promising display technology due to their wide color gamut for authentic color expression. Currently, the external quantum efficiency (EQE) for state‐of‐the‐art blue perovskite QLEDs is about 15%, which still lags behind its green and red counterparts (>25%) and blue film‐based LEDs. Here, blue perovskite QLEDs that achieve an EQE of 23.5% at 490 nm is presented, to the best knowledge, which is the highest value reported among blue perovskite‐based LED fields. This impressive efficiency is achieved through a combination of quantum dot (QD) passivation and optimal device design. First, blue mixed halide perovskite…

• NN
  National Natural Science Foundation of China

  Awards: 52272166, 22205214, 12204427
• CP
  China Postdoctoral Science Foundation

  Award: 2022M712910