Strong blue emission from Er~(3+) doped in Al_xGa_(1-x)N

摘要

Er ions are introduced into AlxGa1-xN (0 x 1) by ion implantation to investigate the effect of Al composition on the luminescence properties of 4fn inner-shell transitions of Er3+. Strong and sharp emission peaks attributed to the 4f-4f transition of Er3+ are observed in ultra-violet and blue region (400-550 nm) from the samples with AlN molar fraction of x > 0.3. These photoemissions are assigned as 2P3/2-4I15/2, 2P3/2-4I13/2, 2P3/2-4I11/2, and 2P3/2-4H11/2 transitions, and the 408 nm emission, corresponding to 2P3/2-4I13/2 transition, is the strongest in the present work. As increasing the Al composition, the intensity of Er3+-related emissions is rapidly increased and the thermal quenching properties is also improved.