Abstract
Excitation and emission spectra of Mn-doped Bi4Ge3O12 have been studied within the range 200 to 650 nm. Aside from the 490 mn intrinsic emission band, also present in pure crystals, a band with a peak at 580 nm is observed. This emission is attributed to the 4T1(4G)-6A1(6S) transition of Mn2+ in a cubic crystal field. The excitation spectra exhibit three different regions: (i) below 280 nm, the intrinsic band observed in pure crystals is also found; (ii) at about 290 nm, a band is observed to excite the Mn2+ emission (at 580 nm), and is attributed to an energy transfer from a Bi3+ ion, which is perturbed by the emitting Mn2+ ion; (iii) above 310 nm, small excitation bands of cubic Mn2+ are observed. An estimate of the Mn2+ crystal-field parameters gave the following values: B=720 cm-1, C=3270 cm-1 and Dq=665 cm-1.
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