Chae, Y.-B.; Kim, S.-Y.; Choi, H.-D.; Moon, D.-G.; Lee, K.-H.; Kim, C.-K. Enhancing Efficiency in Inverted Quantum Dot Light-Emitting Diodes through Arginine-Modified ZnO Nanoparticle Electron Injection Layer. Nanomaterials2024, 14, 266.
Chae, Y.-B.; Kim, S.-Y.; Choi, H.-D.; Moon, D.-G.; Lee, K.-H.; Kim, C.-K. Enhancing Efficiency in Inverted Quantum Dot Light-Emitting Diodes through Arginine-Modified ZnO Nanoparticle Electron Injection Layer. Nanomaterials 2024, 14, 266.
Chae, Y.-B.; Kim, S.-Y.; Choi, H.-D.; Moon, D.-G.; Lee, K.-H.; Kim, C.-K. Enhancing Efficiency in Inverted Quantum Dot Light-Emitting Diodes through Arginine-Modified ZnO Nanoparticle Electron Injection Layer. Nanomaterials2024, 14, 266.
Chae, Y.-B.; Kim, S.-Y.; Choi, H.-D.; Moon, D.-G.; Lee, K.-H.; Kim, C.-K. Enhancing Efficiency in Inverted Quantum Dot Light-Emitting Diodes through Arginine-Modified ZnO Nanoparticle Electron Injection Layer. Nanomaterials 2024, 14, 266.
Abstract
Many quantum dot light-emitting diodes (QLEDs) utilize ZnO nanoparticles (NPs) as an electron injection layer (EIL). However, the use of ZnO NP ETL material often results in charge imbalance within the quantum dot (QD) emitting layer (EML) and exciton quenching at the interface of QD EML and ZnO NP EIL. To overcome these challenges, we introduced an Arginine (Arg) interlayer (IL) onto the ZnO NP EIL. The Arg IL elevated the work function of ZnO NPs, thereby suppressing electron injection into the QD, leading to improved charge balance within the QDs, Additionally, the inherent insulating nature of the Arg IL prevented direct contact between QDs and ZnO NPs, reducing exciton quenching and consequently improving device efficiency. The inverted QLED (IQLED) utilizing a 20-nm-thick Arg IL on ZnO NP EIL exhibited a 2.22-fold increase in current efficiency and a 2.28-fold increase in EQE and compared to an IQLED without an IL. Likewise, the IQLED with a 20-nm-thick Arg IL on ZnO NP EIL demonstrated a 1.34-fold improvement in current efficiency and a 1.36-fold increase in EQE compared to IQLED with a 5-nm-thick PEI IL on ZnO NPs.
Keywords
Arginine; PEI; interlayer; ZnO nanoparticles; work function Inverted quantum dot light-emitting diode
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
