T. Brunold et al., SPECTROSCOPY OF CRO4(4-), MNO3(4-) AND FEO4(2-) - NEW (3D)(2) LUMINOPHORES IN THE NIR, Journal of luminescence, 60-1, 1994, pp. 138-141
The (3d)2 ions Cr4+, Mn5+ and Fe6+ show sharp-line luminescence in the
NIR around 1.2, 1.2 and 1.6 mum, respectively. An attempt is made to
find trends and similarities for these three ions and to provide an ap
propriate model.