ABSTRACT
Infrared (IR) photoluminescence (PL) were observed at about 1500 nm and lOOOnm in CuAlS2 single crystals doped with Tm and Yb rare earth elements, respectively. These emissions were assigned to the f-f transitions of trivalent rare earth ions. The intensity of these PL lines decreased and the line-width increased with an increase of temperature. Mechanism of these emissions is discussed in terms of three-center Auger recombination involving the charge transfer state.
