Polymer as an additive in the emitting layer for high-performance quantum dot light-emitting diodes

Feng Liang, Yuan Liu, Yun Hu, Ying Li Shi, Yu Qiang Liu, Zhao Kui Wang, Xue Dong Wang, Bao Quan Sun, Liang Sheng Liao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


A facile but effective method is proposed to improve the performance of quantum dot light-emitting diodes (QLEDs) by incorporating a polymer, poly(9-vinlycarbazole) (PVK), as an additive into the CdSe/CdS/ZnS quantum dot (QD) emitting layer (EML). It is found that the charge balance of the device with the PVK-added EML was greatly improved. In addition, the film morphology of the hole-transporting layer (HTL) which is adjacent to the EML, is substantially improved. The surface roughness of the HTL is reduced from 5.87 to 1.38 nm, which promises a good contact between the HTL and the EML, resulting in low leakage current. With the improved charge balance and morphology, a maximum external quantum efficiency (EQE) of 16.8% corresponding to the current efficiency of 19.0 cd/A is achievable in the red QLEDs. The EQE is 1.6 times as high as that (10.5%) of the reference QLED, comprising a pure QD EML. This work demonstrates that incorporating some polymer molecules into the QD EML as additives could be a facile route toward high-performance QLEDs.

Original languageEnglish
Pages (from-to)20239-20246
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number23
Publication statusPublished - 14 Jun 2017
Externally publishedYes


  • additive
  • charge balance
  • light-emitting diodes
  • morphology
  • quantum dots


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