Takao Oto Takao Oto

Associate Professor, Department of Information Science and Technology, Yamagata University *Profile is at the time of the award.

2026HagukumuScience & Engineering(hagukumu)

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Research topics: Development of high-efficiency red-light-emitting devices using plasmonic nanocavities within honeycomb lattice

Keyword

Summary: The development of high-efficiency red LEDs using InGaN-based materials is essential for realizing next-generation microLED displays that will support the super-smart society. In this study, we propose a plasmonic LED that integrates honeycomb-lattice InGaN nanocolumns with silver nanostructures. By forming an oxide film to suppress surface defects on the nanocolumn sidewall via atomic layer deposition, we construct a nanocavity structure that confines surface plasmon polaritons within the voids, thereby enhancing significant light emission through rapid coupling. This presents a new principle for improving the emission efficiency of InGaN-based red LEDs, with the goal of achieving a tenfold or greater enhancement in red-light emission.

Message

This research addresses the fundamental challenge of low emission efficiency in InGaN-based red microLEDs by employing an innovative approach: plasmonic LEDs that integrate honeycomb-lattice InGaN nanocolumns with silver nanostructures. A key feature of this work is that it simultaneously suppresses surface defects and accelerates surface plasmon polariton coupling through the formation of a lateral oxide layer via atomic layer deposition, thereby presenting a new principle for improving the efficiency of InGaN-based red LEDs. Moving forward, we aim to refine this technology into a fully functional device capable of current injection, targeting a tenfold or greater enhancement in red-light emission. Furthermore, through the integration of RGB-LEDs and the development of novel optoelectronic devices, we intend to evolve this into a foundational technology with significant academic and societal impact that supports next-generation display technologies.