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XRD patterns of the as-made glass and the glass thermal treated at for . The indexed peaks are those of (Ref. 18).
Emission spectra of the as-made glass and the glass ceramic with the excitation of a laser.
Log-log plot of emission intensity as a function of pump power of laser.
Energy level diagram of and ions and luminescence mechanism of the as-made glass and the glass ceramic under the excitation of a laser at room temperature. The solid lines stand for the absorption and emission transitions for and ions. The curve starting from level represents the nonradiative relaxations. ESA: excited state absorption. ET: energy transfer from to .
Calculated Judd-Ofelt parameters and fluorescence branching ratios of the specified transitions of in the as-made glass (A) and the glass ceramic (B).
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