The red luminescence spectrum of brown diamonds: vibronic coupling

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Abstract
The red luminescence band that occurs in brown diamonds, where the yellow luminescence band originated at 2.721 eV is also present, is excited by light of 450-550 nm, corresponding to an absorption band present in these diamonds. It is a very structured band, up to 12 zero-phonon lines being identified in a 114 meV interval. The authors show that the most intense luminescence band originates at 2.145 eV and the strong vibronic sideband is mainly due to coupling to a dominant phonon of 30 meV with a Huang-Rhys factor of 9.9. Some other zero-phonon lines are also origins of 30 meV phonon progressions. No correlation of line intensities is found from sample to sample or upon varying excitation energy.

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