| Summary: | 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.
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