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Emission spectra with the excitation wavelength at 210 nm for Li-doped at 295 K (a) and at 20 K (d), and at 295 K (b) and at 20 K (c). The assignment of emission lines is given. The intensities in the ranges of 350–545 and 640–670 nm are magnified by a factor of 15.
Excitation spectra with the emission at 612 nm for Li-, Zn-, or Al-doped at 295 K and at 20 K and at 295 K and at 20 K. The inset is the configurational coordinate diagram for in . For the sake of simplification, the multistates for and are ignored.
IR transmittance spectra of and Li-, Zn-, or Al-doped .
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