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Proceedings Paper

Growth and characterization of InGaN/GaN nanocolumn LED
Author(s): Akihiko Kikuchi; Makoto Tada; Kyoko Miwa; Katsumi Kishino
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Paper Abstract

GaN nanocolumn (sometimes called as nanorod, nanowire, and nanopillar) is a columnar single crystalline GaN nano-crystal having small diameter of from tens to hundreds nanometers. In this paper, photoluminescence (PL) study of GaN nanocolumns and InGaN multiple quantum disks (MQDs) embedded in the GaN nanocolumns grown by RF-plasma assisted molecular beam epitaxy are described. The room temperature PL peak intensity of GaN nanocolumns was several hundred times stronger than that of conventional GaN film with dislocation density of 3~5x109 cm-2. Stimulated emission with very low threshold optical power density of 198~290 kW/cm2 was observed for the GaN nanocolumns. InGaN MQDs also showed intense PL emission with peak wavelength of from 436 (blue) to 614 nm (red). GaN nanocolumn based light emitting diodes (LEDs) with InGaN MQD active layer were successfully fabricated on n-type (111) Si substrates. The emission color of the nanocolumn LED was varied from violet to red by changing the growth conditions of InGaN MQD active layer. The full width at half maximum (FWHM) of emission spectrum of the LED emitting around 500 nm taken from whole semi-transparent top electrode area (Φ=500 μm) was 73.5 nm but from small area (Φ=3 μm) was 37.0 nm. This result suggests that emission spectrum of a single InGaN quantum disk have narrower FWHM but large area LED that contains huge number of nanocolumn LEDs have wider FWHM.

Paper Details

Date Published: 7 February 2006
PDF: 8 pages
Proc. SPIE 6129, Quantum Dots, Particles, and Nanoclusters III, 612905 (7 February 2006); doi: 10.1117/12.647220
Show Author Affiliations
Akihiko Kikuchi, Sophia Univ. (Japan)
CREST, Japan Science and Technology Agency (Japan)
Makoto Tada, Sophia Univ. (Japan)
Kyoko Miwa, Sophia Univ. (Japan)
Katsumi Kishino, Sophia Univ. (Japan)
CREST, Japan Science and Technology Agency (Japan)

Published in SPIE Proceedings Vol. 6129:
Quantum Dots, Particles, and Nanoclusters III
Kurt G. Eyink; Diana L. Huffaker, Editor(s)

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