“…The 2.214 eV (5600 A) energy band which grows simultaneously with A, with temperature or excitation could be interpreted as a phonon replica of this emission. The phonon energy ( =Z 20 meV) is comparable with the energy (18 meV) of a 1,O phonon, found by studying reflection [25] and the red band [7]. Let us point out that the difference in energy between B, and B, and B, and B, is also around 20 meV, which would tend to interpret B, and B3 as phonon replicas of B,.…”