The monolithic integration of InGaN-based multi-color light-emitting diodes (LEDs) exerts a great impact on the full-color application field. The two dimensional arrangement of three primary colors micro-LED is expected to be used as a semiconductor video panel . The emission color of InGaN/GaN triangular latticed nanocolumn arrays with the same lattice constant (L) is controlled by the nanocolumn diameter (D) . For a blue light emission, the narrow nanocolumns should be utilized, resulting in a low filling factor of nanocolumns. However, the use of high filling factor of nanocolumn system is suitable for a stable device fabrication. In this study, therefore, we fabricated the densely-packed regularly arranged InGaN nanocolumns (D/L > 0.9). For the nanocolumn arrays with high filling factors, it was found that the emission color shifted from blue to red with increasing L from 80 to 350 nm. The emission color change is attributed to the different mechanism from Ref. , which is investigated to be clarified. Using the emission color change for the high filling factor nanocolumn system, four-color (red, green, blue, and yellow; RGBY) micro light emitting diodes (LEDs) were integrated in a 20×20 μm2 area (hereinafter called “unit”) and the units were two-dimensionally arrayed in a 16×16 square lattice in 400×400 mm2 area. These nanocolumn micro-LEDs were independently driven using matrix wiring electrodes, exhibiting RGBY light emissions.
 K. Kishino et al., Appl. Phys. Express 6, 012101 (2013).  H. Sekiguchi et al., Appl. Phys. Lett 96, 231104 (2008).
Kazuki Narita, Naoki Sakakibara, Takao Oto, and Katsumi Kishino, "Emission color control for densely packed InGaN-based nanocolumns and demonstration of independent drive of multicolor (RGBY) micro-LED array (Conference Presentation)," Proc. SPIE 10532, Gallium Nitride Materials and Devices XIII, 105321F (Presented at SPIE OPTO: January 31, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2289733.5751531013001.
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