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8 February 2007 InGaN/GaN nanocolumn LEDs emitting from blue to red
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Abstract
Self-assembled GaN nanocolumns were grown on sapphire and Si substrates by rf-plasma-assisted molecular-beam-epitaxy, clarifying the growth condition. The nanocolumn crystal showed a highly efficient photoluminescence (PL) emission at the room temperature, which intensity was 4 times stronger than that of a high-quality GaN substrate. InGaN/GaN quantum-disk nanocolumn LEDs were fabricated on n-type (111) Si substrates. For a macroscopic emission area of 500-&mgr;m-diameter, a broad electro-luminescence (EL) emission spectrum extending from the blue to the red region was observed. Microscopic EL measurement was performed for a 3-&mgr;m-diameter detection area, demonstrating a drastic spectral narrowing. In the microscopic EL spectrum, no blue shift of the emission wavelength was observed when the injection current increased. This suggests that the carrier localization or/and the piezo-electric field is minimized in nanocolumns. Selective growth of GaN nanocolumns was performed by use of patterned pre-deposited Al layers.
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K. Kishino, A. Kikuchi, H. Sekiguchi, and S. Ishizawa "InGaN/GaN nanocolumn LEDs emitting from blue to red", Proc. SPIE 6473, Gallium Nitride Materials and Devices II, 64730T (8 February 2007); https://doi.org/10.1117/12.695168
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