Journal
DIAMOND AND RELATED MATERIALS
Volume 20, Issue 5-6, Pages 849-852Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2011.04.002
Keywords
Boron nitride (BN); High pressure high temperature (HTHP); Optical properties; Excitons; Light emission
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Funding
- Grants-in-Aid for Scientific Research [23310096, 23246116] Funding Source: KAKEN
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Luminous properties of hexagonal boron nitride (hBN) single-crystal powder were studied by cathodoluminescence and photoluminescence spectroscopy. The single crystals grown by a high pressure and high temperature method showed typical excitonic spectra at peak wavelengths of 215, 220, and 227 nm at room temperature. Well-faceted hexagonal shaped single crystals exhibited the dominant 215-nm band. The 220-and 227-nm bands were singly or concurrently observed in the case of irregular-shaped crystal powders, though no discernible difference between the morphologies of crystal powders showing differently superimposed luminous spectral profiles of the 220- and 227-nm bands was observed. However, each band showed different spectral and decay features at 8 K. implying that the origins of the two bands are different. (C) 2011 Elsevier By. All rights reserved.
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