Yg. Kim et al., Photoluminescence spectral lines identification in Ho3+-, Er3+-, and Tm3+-doped MgxZn1-xSe single crystals, J MATER RES, 14(4), 1999, pp. 1227-1234
MgxZn1-xSi:Ho3+, MgxZn1-x,Se:Er3+, and MgxZn1-xSe:Tm3+ single crystals were
grown by the closed-tube sublimation method, The single crystals crystalli
zed into a zincblende structure at the composition x = 0.11 and a wurtzite
structure at the composition x = 0.25, 0.32, and 0.41, The trivalent ions (
Ho3+, Er3+ and Tm3+) of the rare-earth elements Ho, Er, and Tm site in Td a
nd Cg, symmetries in the single crystals with zincblende and wurtzite struc
tures, respectively, Sharp emission peaks appeared in the photoluminescence
spectra of the single crystals. These emission peaks are identified to ori
ginate from the radiation recombination between the energy levels of the tr
ivalent ions sited in Td and C-3v symmetries.