Electroluminescence efficiency enhancement in quantum dot light-emitting diodes by embedding a silver nanoisland layer

• Main Authors: Yang, Xuyong, Hernandez-Martinez, Pedro Ludwig, Dang, Cuong, Mutlugun, Evren, Zhang, Kang, Demir, Hilmi Volkan, Sun, Xiao Wei
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
• Online Access: https://hdl.handle.net/10356/103020; http://hdl.handle.net/10220/25817
• Institution: Nanyang Technological University

A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced electroluminescence by embedding a thin layer of Ag nanoislands into hole transport layer. The maximum external quantum efficiency (EQE) of 7.1% achieved in the present work is the highest efficiency value reported for green-emitting QLEDs with a similar structure, which corresponds to 46% enhancement compared with the reference device. The relevant mechanisms enabling the EQE enhancement are associated with the near-field enhancement via an effective coupling between excitons of the quantum dot emitters and localized surface plasmons around Ag nano­islands, which are found to lead to good agreement between the simulation results and the experimental data, providing us with a useful insight important for plasmonic QLEDs.