Issue 3, 2024

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

Abstract

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.

Graphical abstract: Phenethylammonium bromide interlayer for high-performance red quantum-dot light emitting diodes

Supplementary files

Article information

Article type
Communication
Submitted
08 nov 2023
Accepted
03 jan 2024
First published
04 jan 2024
This article is Open Access
Creative Commons BY license

Nanoscale Horiz., 2024,9, 465-471

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

Q. Chen, Y. Hu, J. Lin, J. Huang, S. Gong and G. Xie, Nanoscale Horiz., 2024, 9, 465 DOI: 10.1039/D3NH00495C

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