Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Anisotropic nanocrystals (NCs), such as semiconductor nanorods (NRs), exhibit unique optical and electrical properties arising from asymmetric quantum confinement. [1-2] Such features can be realized further at the device level thanks to ordered arrays of NRs created through directional interactions.[2-5] However, long-range assembly of colloidal anisotropic NCs into thin films with orientational and positional order has remained a challenge despite significant research efforts and advancements. Here, we achieve a vertically aligned film of NRs with high uniformity through a simple, replicable external field directed assembly approach. Afterwards, a reliable inverted LED with the ordered arrays of NRs was fabricated successfully. We realize that the vertically aligned NRs-based LED exhibits the outstanding optoelectronic performance owning to highly vertically uniform, 2-dimensional (2-D) superstructures with long-range order of quantum dots in NRs with superior properties. In particular, the LED achieves a superior value of the external quantum efficiencies (EQEs), ~2.1%, which is comparable to state-of-the-art LEDs produced by vacuum deposition. To the best of our knowledge, the NRs-LED device performance is one of the best for inverted red NR-LEDs and the EPD fabrication method for the vertically aligned NRs for the LED device has never been reported before.
We acknowledge funding from Irish Research Council (IRC) under Grant No. IRCLA/2017/285.
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