期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 20, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/7/075233
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资金
- Engineering and Physical Sciences Research Council [EP/C511212/1] Funding Source: researchfish
Using synchrotron-based luminescence excitation spectroscopy in the energy range 4-20 eV at 8 K, the indirect Gamma-X optical band-gap transition in cubic boron nitride is determined as 6.36 +/- 0.03 eV, and the quasi-direct band-gap energy of hexagonal boron nitride is determined as 5.96 +/- 0.04 eV. The composition and structure of the materials are self-consistently established by optically detected x-ray absorption spectroscopy, and both x-ray diffraction and Raman measurements on the same samples give independent confirmation of their chemical and structural purity: together, the results are therefore considered as providing definitive measurements of the optical band-gap energies of the two materials.
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