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

Abstract

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 obtaining 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.

Improving the luminous efficiency of red nanocolumn μ-LEDs by reducing electrode size to ϕ2.2 μm

“…21) This configuration can be realized for InGaN/GaN nanocolumn LEDs by depositing metals on the nanocolumn sidewalls. By depositing an Au film on SiO 2 -covered nanocolumn arrays, 5.2-and 4.8-fold enhancements in the photoluminescence intensity were observed at 600 nm (amber) and 680 nm (red) for triangle- 22) and honeycomblattice nanocolumns, 23) respectively.…”