Plasmonic red-light-emission enhancement by honeycomb-latticed InGaN/GaN ordered fine nanocolumn arrays

By using ordered fine nanocolumns suitable for high-efficiency red-emission, emission enhancement based on surface plasmon polariton (SPP) coupling was successfully obtained for the honeycomb lattice. This lattice enables us to obtain a longer SPP resonant wavelength in the red region, which could not be attained for the triangular lattice. A 4.8-fold red-emission enhancement was achieved for the honeycomb lattice, demonstrating effective synergy between plasmonic and nanocrystalline effects within the red-emission nanocolumn system. Additionally, a 3.2-fold light-extraction enhancement was attained by changing the emission directionality by introducing plasmonic crystals (PlCs) in addition to metal reflection.