Abstract
Photo- and cathodo-luminescence measurements of a variable-diameter ensemble of GaN nanowires revealed a diameter-dependent, spectral emission distribution between 350 nm and 850 nm. Spectral analysis indicated that wires with a diameter less than 400 nm were dominated by a yellow luminescence with a weaker near UV/violet emission also present. Examination of this ensemble showed that there was a general trend in the ratio of near-UV-to-yellow emission intensities with increasing nanowire diameter. Additionally, a broad green emission appears in the nanowires with a diameter above approximately 200 nm. A calculation based on the nanoheteroepitaxy model indicates that this diameter represents a transitional thickness where strain is relieved by defect formation mechanisms with a characteristic green emission.
Original language | English |
---|---|
Pages (from-to) | 2982-2986 |
Number of pages | 5 |
Journal | Journal of Crystal Growth |
Volume | 311 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2009 May 1 |
Keywords
- A1. Stresses
- B1. Gallium compounds
- B1. Nanomaterials
- B2. Semiconducting gallium compounds
ASJC Scopus subject areas
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry