Two new photoluminescence spectra were found in material which was co-doped with Au and Li. A zero-phonon line at 1.1223eV, whose intensity was correlated with the concentration of Au acceptors that was passivated by Li, was attributed to an exciton that was bound to an electrically inactive complex of Au and Li. A spectrum with a zero-phonon line structure, which had 2 main components at 0.7654 and 0.7664eV, exhibited a correlation with the concentration of an acceptor, with a level at Ev + 0.76eV, which had previously been associated with Au and at least one Li atom. This photoluminescence spectrum was suggested to reflect a recombination from shallow excited states to the ground state of this deep acceptor. It was concluded that the present Au-Li-related defects were different to 2 recently reported paramagnetic Au-Li complexes.

H.P.Gislason, S.Kristjansson, E.O.Sveinbjörnsson: Materials Science Forum, 1995, 196-201, 695-700