Synthesis and characterization of Co2+-doped lithium aluminum spinel nanocrystals

In this paper, Co2+-doped LiAl5O8 nanocrystals were prepared via a citrate sol–gel method. The as-prepared LiAl5O8 nanocrystals appear to be single cubical crystalline phase with an average diameter of 15–30 nm. The absorption spectrum of doped Co2+ ions in the near-infrared region exhibits a broad absorption band centered at 1400 nm.