Dipanjan Gope, Albert E. Ruehli, et al.
IEEE T-MTT
Single crystals of Zn2SiO4 (willemite) in the form of hexagonal prisms several millimeters in size are grown between 1300 and 960°C by the cooling (1°C/h) of molten solutions composed of 5 Zn2SiO4 + 3 Pb2ZnSi2O7. Supplying most of the zinc as the fluoride improves crystal size and quality as do Mn and especially As. Chemical analyses and buoyancy density measurements indicate a nonstoichiometric Zn1.96Si1.04O4.04 crystal formula. Divalent Mn substitutes significantly, but not completely, for Zn to form solid solutions of the well-known and efficient green willemite phosphor. Arsenic, which increases the persistence of phosphorescence (afterglow), is incorporated into willemite crystals to a lesser degree than Mn, i.e., As has a low segregation coefficient. Little if any Pb is soluble in willemite grown this way. © 1982.
Dipanjan Gope, Albert E. Ruehli, et al.
IEEE T-MTT
U. Wieser, U. Kunze, et al.
Physica E: Low-Dimensional Systems and Nanostructures
S. Cohen, T.O. Sedgwick, et al.
MRS Proceedings 1983
William Hinsberg, Joy Cheng, et al.
SPIE Advanced Lithography 2010