I would be grateful to my colleagues for the transfer of samples for the purpose of comparison with natural samples in terms of luminescent properties.
Sorry for the late answer, but I just recognised your request. Our working group "Tailored Optical Materials" at the University of Applied Sciences Münster is delaing with the optimisation of inorganic luminescent materials. Even though, the materials you have been asked for are not available for the moment, we could easily manaufactur RE doped tungstates up to 100 g samples, e.g. in the framework of a thesis (B.Sc. or M.Sc.), since we work on scheelite type materials (RE tungstates and molybdates and so on) for quite some time.
Please check our homepage and Phosphor Information Access and Spectra (PISA) page, just in case you are interested in other compounds too.