Effect of Al composition on luminescence properties of rare-earth implanted into AlGaN

Abstract

Effects of alloy composition on PL properties of Eu and Tb implanted nitrides are investigated. Strong red emissions corresponding to the transition from D-5(0) to F-7(i) states in Eu3+ are observed at room temperature. The intensity of Eu-related luminescence increases with increasing the Al composition in AlGaN, while the decay time indicates opposite trend. From the Tb-implanted samples, sharp emissions are observed in the wavelength range of 490-650nm at low-temperature, and the strongest peak is assigned as the transition from D-5(4) to F-7(6) states in Tb3+. The luminescence intensity is increased with increasing the Al composition. Thermal quenching properties are also improved by increasing the Al composition.