Efficient quantum dot light emitting diodes for solid state lighting and displays

• Main Author: Yang, Xuyong
• Other Authors: Sun Xiaowei
• Format: Theses and Dissertations
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics; DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics; DRNTU::Engineering::Electrical and electronic engineering::Semiconductors; DRNTU::Engineering::Materials::Nanostructured materials
• Online Access: https://hdl.handle.net/10356/61730
• Institution: Nanyang Technological University

Quantum dot-based light-emitting diodes (QLEDs) with advantages in colour quality, stability and cost-effectiveness are emerging as a candidate for single-material, full colour light sources. The focus of this study is to solve some challenging problems that hinder the ultimate research transformation and commercialization of the QLED technology. Our light out-coupling strategy enhanced device efficiency up to 9.34%, the record high value for green QLEDs. The substitution of organic charge transport layers with metal oxide nanoparticles significantly improved the operating lifetime of QLEDs by a factor of 20. Our development of the narrowest-linewidth, high-quality InP-based QDs with wavelength tunability across full visible spectrum solved the toxicity problem of QDs effectively. The use of Kapton tape and metal electrodes in top-emitting LED architecture made a significant breakthrough in flexible QLED performance with the best efficiency of 4.03%. Our study reported in this thesis contributed to the fast development of the QLEDs.