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The emission spectra of in and BAM. The emission spectra of in are plotted by normalized BAM emission under each excitation (Inset a: the emission intensity of as a function of concentration in ; b: excitation spectrum of in ).
The excitation spectra of in : a: fresh sample; b: Sample a annealed at 773 K in air; c: Sample b reannealed at 973 K in . The emission spectra recorded under 147 nm excitation is shown in the inset.
Schematic diagram of proposed model for the excitation and emission processes of in (1: Indirect excitation; 2: Direct excitation).
The XRD patterns of prepared at 1073 and 1173 K. The inset shows the emission spectra of in these samples under 254 nm excitation.
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