Determination of the optical band-gap energy of cubic and hexagonal boron nitride using luminescence excitation spectroscopy

D. A. Evans, A. G. McGlynn, B. M. Towlson, M. Gunn, D. Jones, T. E. Jenkins, R. Winter, N. R. J. Poolton

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Abstract

Using synchrotron-based luminescence excitation spectroscopy in the energy range 4–20 eV at 8 K, the indirect _x005F_x0002_–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.
Original languageEnglish
Article number075233
JournalJournal of Physics: Condensed Matter
Volume20
Issue number7
Early online date31 Jan 2008
DOIs
Publication statusPublished - 20 Feb 2008

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