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. 2015 Oct 5;5:14789. doi: 10.1038/srep14789

Figure 3. Typical photoluminescence spectra of diamonds synthesized in the Ge-C system.

Figure 3

Spectra were recorded at (a) 300 K and (b,c) 80 K. Spectrum (c), multiplied by a factor of 10, shows details of the phonon sideband of the 2.059 eV optical system. The spectra were displaced vertically for clarity.