Synthesis and spectroscopic investigation of ruby microstructures

Ribeiro, C. T. M.; Zanattaa, A. R.
September 2003
Applied Physics Letters;9/22/2003, Vol. 83 Issue 12, p2336
Academic Journal
Light-emitting structures with microscopic dimensions have been produced after thermal annealing Cr-doped amorphous (a-)AlN films in an atmosphere of dry oxygen. The annealing treatments were performed at 1050 °C and induced the formation of structures that emit red light at room temperature. Depending on the time taken during thermal anneal, there appears regions which emit light either at approximately 683 or 693 nm, as indicated by photoluminescence (PL) measurements. Their presence is attributed to different local environments to the Cr[sup 3+] ions: oxygen-rich regions (rendering PL at ∼693 nm) and nitrogen-rich regions (with narrow PL lines at ∼683 nm and a broad contribution at higher wavelengths). In view of their spatial dimensions, and distinctive PL characteristics, the features emitting at approximately 693 nm were designated by ruby microstructures (RbMSs). Both PL imaging and atomic force microscopy indicate that isolated RbMSs are almost circular having their origin from defects on the surface of the substrate or in the film itself. © 2003 American Institute of Physics.


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