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X-ray diffractograms of powder doped with , obtained by combustion synthesis: (a) powder in the as-synthesized state and (b) heat-treated powder for in air at .
Room temperature luminescence spectra of powder doped with : (a) powder sample in the as-synthesized state and (b) heat-treated powder for in air at . Excitation wavelength: .
Luminescence signal peaked at for the powders. (a) Pulsed laser excitation signal to illustrate the detection system response time; (b) luminescence signal from the as-synthesized powder sample; and (c) the luminescence produced by the heat-treated sample. Excitation wavelength: .
Schematic representation of possible luminescence pathways in the powder indicating possible cross-relaxation processes responsible for the luminescence enhancement.
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