A defect associated with Li in ZnO was reported. This was an optical system which absorbed strongly in the red part of the spectrum: a doublet, the zero phonon lines were at 1.884 and 1.879eV, respectively. The chemical nature of the center was identified by isotope substitution. This was the first observation of sharp optical features involving Li in ZnO. Although there were similarities to a Li electron paramagnetic resonance center, it was not yet possible to make correlations with the optical center. Similarities to a previously attributed system involving Ni were pointed out.

Optical Absorption of a Li-Related Impurity in ZnO. McCabe, D., Johnston, K., Henry, M.O., McGlynn, E., Alves, E., Davies, J.J.: Physica B, 2003, 340-342, 225-9