Luminescence properties of wurtzite AlN nanotips

• DOI: 10.1063/1.2364158
• Publication Date: 2006-10-20T22:30:07Z
• Authors: Shih-Chen Shi; Chia Fu Chen; Surojit Chattopad...; Kuei-Hsien Chen; Bo-Wen Ke; Li-Chyong Chen; Laima Trinkler; Baiba Berzina
• Keywords: 02 engineering and technology; 0210 nano-technology

The optical properties of aluminum nitride nanotips (AlNNTs) synthesized via vapor transport and condensation process have been studied by cathodoluminescence, photoluminescence (PL), thermoluminescence (TL), and UV absorption measurements. Two defect related transitions around 2.1 and 3.4eV and an excitonic feature at 6.2eV were identified. Compared to the AlN macropowders, the AlNNTs showed a blueshift (+0.2eV) of the ∼3.2eV peak. Analysis of both PL and TL excitation measurements indicated the existence of subband gap multiple energy levels in AlNNTs. A significant TL intensity even at 145°C suggests possible ultraviolet detector and dosimetric applications of these AlNNTs.