Login / Signup

Phenethylammonium bromide interlayer for high-performance red quantum-dot light emitting diodes.

Qiyin ChenYun HuYaohua MaiJingsong HuangShu-Ling GongGuohua Xie
Published in: Nanoscale horizons (2024)
Interfacial modification is vital to boost the performance of colloidal quantum-dot light-emitting diodes (QLEDs). We introduce phenethylammonium bromide (PEABr) as an interlayer to reduce the trap states and exciton quenching at the interface between the emitting layer (EML) with CdSe/ZnS quantum-dots and the electron transport layer (ETL) with ZnMgO. The presence of PEABr separates the EML and the ETL and thus passivates the surface traps of ZnMgO. Moreover, the interfacial modification also alleviates electron injection, leading to more improved carrier injection balance. Consequently, the external quantum efficiency of the PEABr-based red QLED reached 27.6%, which outperformed those of the previously reported devices. Our results indicate that the halide ion salts are promising to balance charge carrier injection and reduce exciton quenching in the QLEDs.
Keyphrases
  • quantum dots
  • energy transfer
  • solar cells
  • ionic liquid
  • sensitive detection
  • ultrasound guided
  • electron transfer
  • perovskite solar cells
  • molecular dynamics simulations
  • mouse model
  • electron microscopy
  • light emitting